add files removed from test path

1 files changed, 1899 insertions, 0 deletions

diff --git a/src/lodepng.h b/src/lodepng.h
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+++ b/src/lodepng.h
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+#ifndef LODEPNG_H_
+#define LODEPNG_H_
+
+/*
+LodePNG version 20110908
+
+Copyright (c) 2005-2011 Lode Vandevenne
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution.
+*/
+
+#ifndef LODEPNG_H
+#define LODEPNG_H
+
+#include <string.h> /*for size_t*/
+
+#ifdef __cplusplus
+#include <vector>
+#include <string>
+#endif /*__cplusplus*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* Code Sections                                                              */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+The following #defines are used to create code sections. They can be disabled
+to disable code sections, which can give faster compile time and smaller binary.
+*/
+
+/*deflate&zlib encoder and deflate&zlib decoder.
+If this is disabled, you need to implement the dummy LodePNG_zlib_compress and
+LodePNG_zlib_decompress functions in the #else belonging to this #define in the
+source file.*/
+#define LODEPNG_COMPILE_ZLIB
+/*png encoder and png decoder*/
+#define LODEPNG_COMPILE_PNG
+/*deflate&zlib decoder and png decoder*/
+#define LODEPNG_COMPILE_DECODER
+/*deflate&zlib encoder and png encoder*/
+#define LODEPNG_COMPILE_ENCODER
+/*the optional built in harddisk file loading and saving functions*/
+#define LODEPNG_COMPILE_DISK
+/*any code or struct datamember related to chunks other than IHDR, IDAT, PLTE, tRNS, IEND*/
+#define LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*handling of unknown chunks*/
+#define LODEPNG_COMPILE_UNKNOWN_CHUNKS
+/*ability to convert error numerical codes to English text string*/
+#define LODEPNG_COMPILE_ERROR_TEXT
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* Simple Functions                                                           */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+This are the simple C and C++ functions, which cover basic usage.
+Further on in the header file are the more advanced functions allowing custom behaviour.
+*/
+
+#ifdef LODEPNG_COMPILE_PNG
+
+/*constants for the PNG color types. "LCT" = "LodePNG Color Type"*/
+#define LCT_GREY 0 /*PNG color type greyscale*/
+#define LCT_RGB 2 /*PNG color type RGB*/
+#define LCT_PALETTE 3 /*PNG color type palette*/
+#define LCT_GREY_ALPHA 4 /*PNG color type greyscale with alpha*/
+#define LCT_RGBA 6 /*PNG color type RGB with alpha*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*
+Converts PNG data in memory to raw pixel data.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     Its size is w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
+     Must be freed after usage with free(*out).
+w: Output parameter. Pointer to width of pixel data.
+h: Output parameter. Pointer to height of pixel data.
+in: Memory buffer with the PNG file.
+insize: size of the in buffer.
+colorType: the desired color type for the raw output image. See explanation on PNG color types.
+bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned LodePNG_decode(unsigned char** out, unsigned* w, unsigned* h,
+                        const unsigned char* in, size_t insize, unsigned colorType, unsigned bitDepth);
+
+/*Same as LodePNG_decode, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBA)*/
+unsigned LodePNG_decode32(unsigned char** out, unsigned* w, unsigned* h,
+                          const unsigned char* in, size_t insize);
+
+/*Same as LodePNG_decode, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB)*/
+unsigned LodePNG_decode24(unsigned char** out, unsigned* w, unsigned* h,
+                          const unsigned char* in, size_t insize);
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load PNG from disk, from file with given name.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     Its size is w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
+     Must be freed after usage with free(*out).
+w: Output parameter. Pointer to width of pixel data.
+h: Output parameter. Pointer to height of pixel data.
+filename: Path on disk of the PNG file.
+colorType: the desired color type for the raw output image. See explanation on PNG color types.
+bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned LodePNG_decode_file(unsigned char** out, unsigned* w, unsigned* h,
+                             const char* filename, unsigned colorType, unsigned bitDepth);
+
+/*Same as LodePNG_decode_file, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBA)*/
+unsigned LodePNG_decode32_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename);
+
+/*Same as LodePNG_decode_file, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB)*/
+unsigned LodePNG_decode24_file(unsigned char** out, unsigned* w, unsigned* h, const char* filename);
+
+
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Converts raw pixel data into a PNG image in memory. The colorType and bitDepth
+  of the output PNG image cannot be chosen, they are automatically determined
+  by the colorType, bitDepth and content of the input pixel data.
+out: Output parameter. Pointer to buffer that will contain the raw pixel data.
+     Must be freed after usage with free(*out).
+outsize: Output parameter. Pointer to the size in bytes of the out buffer.
+image: The raw pixel data to encode. The size of this buffer should be
+       w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
+w: width of the raw pixel data in pixels.
+h: height of the raw pixel data in pixels.
+colorType: the color type of the raw input image. See explanation on PNG color types.
+bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned LodePNG_encode(unsigned char** out, size_t* outsize,
+                        const unsigned char* image, unsigned w, unsigned h, unsigned colorType, unsigned bitDepth);
+
+/*Same as LodePNG_encode, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBA).*/
+unsigned LodePNG_encode32(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h);
+
+/*Same as LodePNG_encode, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB).*/
+unsigned LodePNG_encode24(unsigned char** out, size_t* outsize, const unsigned char* image, unsigned w, unsigned h);
+
+#ifdef LODEPNG_COMPILE_DISK
+
+/*
+Converts raw pixel data into a PNG file on disk. Same as LodePNG_encode, but
+outputs to disk instead of memory buffer.
+filename: path to file on disk to write the PNG image to.
+image: The raw pixel data to encode. The size of this buffer should be
+       w * h * (bytes per pixel), bytes per pixel depends on colorType and bitDepth.
+w: width of the raw pixel data in pixels.
+h: height of the raw pixel data in pixels.
+colorType: the color type of the raw input image. See explanation on PNG color types.
+bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
+Return value: LodePNG error code (0 means no error).
+*/
+unsigned LodePNG_encode_file(const char* filename, const unsigned char* image,
+                             unsigned w, unsigned h, unsigned colorType, unsigned bitDepth);
+
+/*Same as LodePNG_encode_file, but uses colorType = 6 and bitDepth = 8 by default (32-bit RGBS).*/
+unsigned LodePNG_encode32_file(const char* filename, const unsigned char* image, unsigned w, unsigned h);
+
+/*Same as LodePNG_encode_file, but uses colorType = 2 and bitDepth = 8 by default (24-bit RGB).*/
+unsigned LodePNG_encode24_file(const char* filename, const unsigned char* image, unsigned w, unsigned h);
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef __cplusplus
+namespace LodePNG
+{
+
+#ifdef LODEPNG_COMPILE_DECODER
+  /*
+  Converts PNG data in memory to raw pixel data.
+  out: Output parameter, std::vector containing the raw pixel data. Its size
+    will be w * h * (bytes per pixel), where bytes per pixel is 4 if the default
+    colorType=6 and bitDepth=8 is used. The pixels are 32-bit RGBA bit in that case.
+  w: Output parameter, width of the image in pixels.
+  h: Output parameter, height of the image in pixels.
+  in: Memory buffer with the PNG file.
+  insize: size of the in buffer.
+  colorType: the desired color type for the raw output image. See explanation on PNG color types.
+  bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+  Return value: LodePNG error code (0 means no error).
+  */
+  unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                  const unsigned char* in, size_t insize, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+
+  /*
+  Same as the decode function that takes a unsigned char buffer, but instead of giving
+  a pointer and a size, this takes the input buffer as an std::vector.
+  */
+  unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                  const std::vector<unsigned char>& in, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+  /*
+  Converts PNG file from disk to raw pixel data in memory.
+  out: Output parameter, std::vector containing the raw pixel data. Its size
+    will be w * h * (bytes per pixel), where bytes per pixel is 4 if the default
+    colorType=6 and bitDepth=8 is used. The pixels are 32-bit RGBA bit in that case.
+  w: Output parameter, width of the image in pixels.
+  h: Output parameter, height of the image in pixels.
+  filename: Path to PNG file on disk.
+  colorType: the desired color type for the raw output image. See explanation on PNG color types.
+  bitDepth: the desired bit depth for the raw output image. See explanation on PNG color types.
+  Return value: LodePNG error code (0 means no error).
+  */
+  unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+                  const std::string& filename, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+  /*
+  Converts 32-bit RGBA raw pixel data into a PNG image in memory.
+  out: Output parameter, std::vector containing the PNG image data.
+  in: Memory buffer with raw pixel data. The size of this buffer should be
+       w * h * (bytes per pixel), With the default colorType=6 and bitDepth=8, bytes
+       per pixel should be 4 and the data is a 32-bit RGBA pixel buffer.
+  w: Width of the image in pixels.
+  h: Height of the image in pixels.
+  colorType: the color type of the raw input image. See explanation on PNG color types.
+  bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
+  Return value: LodePNG error code (0 means no error).
+  */
+  unsigned encode(std::vector<unsigned char>& out, const unsigned char* in,
+                  unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+
+  /*
+  Same as the encode function that takes a unsigned char buffer, but instead of giving
+  a pointer and a size, this takes the input buffer as an std::vector.
+  */
+  unsigned encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                  unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+  /*
+  Converts 32-bit RGBA raw pixel data into a PNG file on disk.
+  filename: Path to the file to write the PNG image to.
+  in: Memory buffer with raw pixel data. The size of this buffer should be
+       w * h * (bytes per pixel), With the default colorType=6 and bitDepth=8, bytes
+       per pixel should be 4 and the data is a 32-bit RGBA pixel buffer.
+  w: Width of the image in pixels.
+  h: Height of the image in pixels.
+  colorType: the color type of the raw input image. See explanation on PNG color types.
+  bitDepth: the bit depth of the raw input image. See explanation on PNG color types.
+  Return value: LodePNG error code (0 means no error).
+  */
+  unsigned encode(const std::string& filename, const unsigned char* in,
+                  unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+
+  /*
+  Same as the encode function that takes a unsigned char buffer, but instead of giving
+  a pointer and a size, this takes the input buffer as an std::vector.
+  */
+  unsigned encode(const std::string& filename, const std::vector<unsigned char>& in,
+                  unsigned w, unsigned h, unsigned colorType = LCT_RGBA, unsigned bitDepth = 8);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_ENCODER
+} //namespace LodePNG
+#endif /*__cplusplus*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ERROR_TEXT
+/*
+Returns a textual description of the error code, in English. The
+numerical value of the code itself is not included in this description.
+*/
+const char* LodePNG_error_text(unsigned code);
+#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* Inflate & Deflate Setting Structs                                          */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+These structs contain settings for the decompression and compression of the
+PNG files. Typically you won't need these directly.
+*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+typedef struct LodePNG_DecompressSettings
+{
+  unsigned ignoreAdler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/
+} LodePNG_DecompressSettings;
+
+extern const LodePNG_DecompressSettings LodePNG_defaultDecompressSettings;
+void LodePNG_DecompressSettings_init(LodePNG_DecompressSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Compression settings. Tweaking these settings tweaks the balance between
+speed and compression ratio.
+*/
+typedef struct LodePNG_CompressSettings /*deflate = compress*/
+{
+  /*LZ77 related settings*/
+  unsigned btype; /*the block type for LZ (0, 1, 2 or 3, see zlib standard). Should be 2 for proper compression.*/
+  unsigned useLZ77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
+  unsigned windowSize; /*the maximum is 32768, higher gives more compression but is slower. Typical value: 2048.*/
+} LodePNG_CompressSettings;
+
+extern const LodePNG_CompressSettings LodePNG_defaultCompressSettings;
+void LodePNG_CompressSettings_init(LodePNG_CompressSettings* settings);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_PNG
+/* ////////////////////////////////////////////////////////////////////////// */
+/* PNG and Raw Image Information Structs                                      */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+Info about the color type of an image.
+The same LodePNG_InfoColor struct is used for both the PNG and raw image type,
+even though they are two totally different things.
+*/
+typedef struct LodePNG_InfoColor
+{
+  /*header (IHDR)*/
+  unsigned colorType; /*color type, see PNG standard or documentation further in this header file*/
+  unsigned bitDepth;  /*bits per sample, see PNG standard or documentation further in this header file*/
+
+  /*
+  palette (PLTE and tRNS)
+
+  This is a dynamically allocated unsigned char array with the colors of the palette, including alpha.
+  The value palettesize indicates the amount of colors in the palette.
+  The allocated size of the buffer is 4 * palettesize bytes, in order RGBARGBARGBA...
+
+  When encoding a PNG, to store your colors in the palette of the LodePNG_InfoRaw, first use
+  LodePNG_InfoColor_clearPalette, then for each color use LodePNG_InfoColor_addPalette.
+
+  If you encode an image without alpha with palette, don't forget to put value 255 in each A byte of the palette.
+
+  When decoding, by default you can ignore this palette, since LodePNG already
+  fills the palette colors in the pixels of the raw RGBA output.
+  */
+  unsigned char* palette; /*palette in RGBARGBA... order*/
+  size_t palettesize; /*palette size in number of colors (amount of bytes is 4 * palettesize)*/
+
+  /*
+  transparent color key (tRNS)
+  This color uses the same bit depth as the bitDepth value in this struct, which can be 1-bit to 16-bit.
+  For greyscale PNGs, r, g and b will all 3 be set to the same.
+
+  When decoding, by default you can ignore this information, since LodePNG sets
+  pixels with this key to transparent already in the raw RGBA output.
+  */
+  unsigned key_defined; /*is a transparent color key given? 0 = false, 1 = true*/
+  unsigned key_r;       /*red/greyscale component of color key*/
+  unsigned key_g;       /*green component of color key*/
+  unsigned key_b;       /*blue component of color key*/
+} LodePNG_InfoColor;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_InfoColor_init(LodePNG_InfoColor* info);
+void LodePNG_InfoColor_cleanup(LodePNG_InfoColor* info);
+/*return value is error code (0 means no error)*/
+unsigned LodePNG_InfoColor_copy(LodePNG_InfoColor* dest, const LodePNG_InfoColor* source);
+
+void LodePNG_InfoColor_clearPalette(LodePNG_InfoColor* info);
+/*add 1 color to the palette*/
+unsigned LodePNG_InfoColor_addPalette(LodePNG_InfoColor* info, unsigned char r,
+                                      unsigned char g, unsigned char b, unsigned char a);
+
+/*additional color info*/
+
+/*get the total amount of bits per pixel, based on colorType and bitDepth in the struct*/
+unsigned LodePNG_InfoColor_getBpp(const LodePNG_InfoColor* info);
+/*get the amount of color channels used, based on colorType in the struct.
+If a palette is used, it counts as 1 channel.*/
+unsigned LodePNG_InfoColor_getChannels(const LodePNG_InfoColor* info);
+/*is it a greyscale type? (only colorType 0 or 4)*/
+unsigned LodePNG_InfoColor_isGreyscaleType(const LodePNG_InfoColor* info);
+/*has it got an alpha channel? (only colorType 2 or 6)*/
+unsigned LodePNG_InfoColor_isAlphaType(const LodePNG_InfoColor* info);
+/*has it got a palette? (only colorType 3)*/
+unsigned LodePNG_InfoColor_isPaletteType(const LodePNG_InfoColor* info);
+/*only returns true if there is a palette and there is a value in the palette with alpha < 255.
+Loops through the palette to check this.*/
+unsigned LodePNG_InfoColor_hasPaletteAlpha(const LodePNG_InfoColor* info);
+
+/*
+Check if the given color info indicates the possibility of having non-opaque pixels in the PNG image.
+Returns true if the image can have translucent or invisible pixels (it still be opaque if it doesn't use such pixels).
+Returns false if the image can only have opaque pixels.
+In detail, it returns true only if it's a color type with alpha, or has a palette with non-opaque values,
+or if "key_defined" is true.
+*/
+unsigned LodePNG_InfoColor_canHaveAlpha(const LodePNG_InfoColor* info);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*
+The information of a Time chunk in PNG.
+To make the encoder add a time chunk, set time_defined to 1 and fill in
+the correct values in all the time parameters. LodePNG will not fill the current
+time in these values itself, all it does is copy them over into the chunk bytes.
+*/
+typedef struct LodePNG_Time
+{
+  unsigned      year;    /*2 bytes used (0-65535)*/
+  unsigned char month;   /*1-12*/
+  unsigned char day;     /*1-31*/
+  unsigned char hour;    /*0-23*/
+  unsigned char minute;  /*0-59*/
+  unsigned char second;  /*0-60 (to allow for leap seconds)*/
+} LodePNG_Time;
+
+/*
+Info about text chunks in a PNG file. The arrays can contain multiple keys
+and strings. The amount of keys and strings is the same. The amount of strings
+ends when the pointer to the string is a null pointer.
+
+They keyword of text chunks gives a short description what the actual text
+represents. There are a few standard standard keywords recognised
+by many programs: Title, Author, Description, Copyright, Creation Time,
+Software, Disclaimer, Warning, Source, Comment. It's allowed to use other keys.
+
+A keyword is minimum 1 character and maximum 79 characters long. It's
+discouraged to use a single line length longer than 79 characters for texts.
+*/
+typedef struct LodePNG_Text /*non-international text*/
+{
+  /*Don't allocate these text buffers yourself. Use the init/cleanup functions
+  correctly and use LodePNG_Text_add and LodePNG_Text_clear.*/
+  size_t num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/
+  char** keys; /*the keyword of a text chunk (e.g. "Comment")*/
+  char** strings; /*the actual text*/
+} LodePNG_Text;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_Text_init(LodePNG_Text* text);
+void LodePNG_Text_cleanup(LodePNG_Text* text);
+/*return value is error code (0 means no error)*/
+unsigned LodePNG_Text_copy(LodePNG_Text* dest, const LodePNG_Text* source);
+
+/*Use these functions instead of allocating the char**s manually*/
+void LodePNG_Text_clear(LodePNG_Text* text); /*use this to clear the texts again after you filled them in*/
+unsigned LodePNG_Text_add(LodePNG_Text* text, const char* key, const char* str); /*push back both texts at once*/
+
+/*
+Info about international text chunks in a PNG file. The arrays can contain multiple keys
+and strings. The amount of keys, lengtags, transkeys and strings is the same.
+The amount of strings ends when the pointer to the string is a null pointer.
+
+A keyword is minimum 1 character and maximum 79 characters long. It's
+discouraged to use a single line length longer than 79 characters for texts.
+*/
+typedef struct LodePNG_IText /*international text*/
+{
+  /*Don't allocate these text buffers yourself. Use the init/cleanup functions
+  correctly and use LodePNG_IText_add and LodePNG_IText_clear.*/
+  
+  /*the amount of international texts in this PNG*/
+  size_t num;
+  /*the English keyword of the text chunk (e.g. "Comment")*/
+  char** keys;
+  /*the language tag for this text's international language, ISO/IEC 646 string, e.g. ISO 639 language tag*/
+  char** langtags;
+  /*keyword translated to the international language - UTF-8 string*/
+  char** transkeys;
+  /*the actual international text - UTF-8 string*/
+  char** strings;
+} LodePNG_IText;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_IText_init(LodePNG_IText* text);
+void LodePNG_IText_cleanup(LodePNG_IText* text);
+/*return value is error code (0 means no error)*/
+unsigned LodePNG_IText_copy(LodePNG_IText* dest, const LodePNG_IText* source);
+
+/*Use these functions instead of allocating the char**s manually*/
+void LodePNG_IText_clear(LodePNG_IText* text); /*use this to clear the itexts again after you filled them in*/
+unsigned LodePNG_IText_add(LodePNG_IText* text, const char* key, const char* langtag,
+                           const char* transkey, const char* str); /*push back the 4 texts of 1 chunk at once*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
+/*
+Unknown chunks read from the PNG, or extra chunks the user wants to have added
+in the encoded PNG.
+*/
+typedef struct LodePNG_UnknownChunks
+{
+  /*There are 3 buffers, one for each position in the PNG where unknown chunks can appear
+    each buffer contains all unknown chunks for that position consecutively
+    The 3 buffers are the unknown chunks between certain critical chunks:
+    0: IHDR-PLTE, 1: PLTE-IDAT, 2: IDAT-IEND
+
+    Do not allocate or traverse this data yourself. Use the chunk traversing functions declared
+    later, such as LodePNG_chunk_next and LodePNG_append_chunk, to read/write this struct.
+    */
+  unsigned char* data[3];
+  size_t datasize[3]; /*size in bytes of the unknown chunks, given for protection*/
+
+} LodePNG_UnknownChunks;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_UnknownChunks_init(LodePNG_UnknownChunks* chunks);
+void LodePNG_UnknownChunks_cleanup(LodePNG_UnknownChunks* chunks);
+/*return value is error code (0 means no error)*/
+unsigned LodePNG_UnknownChunks_copy(LodePNG_UnknownChunks* dest, const LodePNG_UnknownChunks* src);
+#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
+
+/*
+Information about the PNG image, except pixels and sometimes except width and height.
+*/
+typedef struct LodePNG_InfoPng
+{
+  /*header (IHDR), palette (PLTE) and transparency (tRNS)*/
+
+  /*
+  Note: width and height are only used as information of a decoded PNG image. When encoding one, you don't have
+  to specify width and height in an LodePNG_Info struct, but you give them as parameters of the encode function.
+  The rest of the LodePNG_Info struct IS used by the encoder though!
+  */
+  unsigned width;             /*width of the image in pixels (ignored by encoder, but filled in by decoder)*/
+  unsigned height;            /*height of the image in pixels (ignored by encoder, but filled in by decoder)*/
+  unsigned compressionMethod; /*compression method of the original file. Always 0.*/
+  unsigned filterMethod;      /*filter method of the original file*/
+  unsigned interlaceMethod;   /*interlace method of the original file*/
+  LodePNG_InfoColor color;    /*color type and bits, palette and transparency of the PNG file*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*
+  suggested background color (bKGD)
+  This color uses the same bit depth as the bitDepth value in this struct, which can be 1-bit to 16-bit.
+
+  For greyscale PNGs, r, g and b will all 3 be set to the same. When encoding
+  the encoder writes the red one. For palette PNGs: When decoding, the RGB value
+  will be stored, not a palette index. But when encoding, specify the index of
+  the palette in background_r, the other two are then ignored.
+
+  The decoder does not use this background color to edit the color of pixels.
+  */
+  unsigned background_defined; /*is a suggested background color given?*/
+  unsigned background_r;       /*red component of suggested background color*/
+  unsigned background_g;       /*green component of suggested background color*/
+  unsigned background_b;       /*blue component of suggested background color*/
+
+  /*non-international text chunks (tEXt and zTXt)*/
+  LodePNG_Text text;
+
+  /*international text chunks (iTXt)*/
+  LodePNG_IText itext;
+
+  /*time chunk (tIME)*/
+  unsigned char time_defined; /*if 0, no tIME chunk was or will be generated in the PNG image*/
+  LodePNG_Time time;
+
+  /*phys chunk (pHYs)*/
+  unsigned phys_defined; /*if 0, there is no pHYs chunk and the values below are undefined, if 1 else there is one*/
+  unsigned phys_x; /*pixels per unit in x direction*/
+  unsigned phys_y; /*pixels per unit in y direction*/
+  unsigned char phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
+  /*unknown chunks*/
+  LodePNG_UnknownChunks unknown_chunks;
+#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
+} LodePNG_InfoPng;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_InfoPng_init(LodePNG_InfoPng* info);
+void LodePNG_InfoPng_cleanup(LodePNG_InfoPng* info);
+/*return value is error code (0 means no error)*/
+unsigned LodePNG_InfoPng_copy(LodePNG_InfoPng* dest, const LodePNG_InfoPng* source);
+
+/*
+Contains user-chosen information about the raw image data, which is independent of the PNG image
+With raw images, I mean the image data in the form of the simple raw buffer to which the
+compressed PNG data is decoded, or from which a PNG image can be encoded.
+*/
+typedef struct LodePNG_InfoRaw
+{
+  LodePNG_InfoColor color; /*color info of the raw image, note that the same struct as for PNG data is used.*/
+} LodePNG_InfoRaw;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_InfoRaw_init(LodePNG_InfoRaw* info);
+void LodePNG_InfoRaw_cleanup(LodePNG_InfoRaw* info);
+/*return value is error code (0 means no error)*/
+unsigned LodePNG_InfoRaw_copy(LodePNG_InfoRaw* dest, const LodePNG_InfoRaw* source);
+
+/*
+Converts raw buffer from one color type to another color type, based on
+LodePNG_InfoColor structs to describe the input and output color type.
+See the reference manual at the end of this header file to see which color conversions are supported.
+return value = LodePNG error code (0 if all went ok, an error if the conversion isn't supported)
+The out buffer must have size (w * h * bpp + 7) / 8, where bpp is the bits per pixel
+of the output color type (LodePNG_InfoColor_getBpp)
+*/
+unsigned LodePNG_convert(unsigned char* out, const unsigned char* in, LodePNG_InfoColor* infoOut,
+                         LodePNG_InfoColor* infoIn, unsigned w, unsigned h);
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* LodePNG Decoder                                                            */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+Settings for the decoder. This contains settings for the PNG and the Zlib
+decoder, but not the Info settings from the Info structs.
+*/
+typedef struct LodePNG_DecodeSettings
+{
+  LodePNG_DecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
+
+  unsigned ignoreCrc; /*ignore CRC checksums*/
+  unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  unsigned readTextChunks; /*if false but rememberUnknownChunks is true, they're stored in the unknown chunks*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+#ifdef LODEPNG_COMPILE_UNKNOWN_CHUNKS
+  /*store all bytes from unknown chunks in the InfoPng (off by default, useful for a png editor)*/
+  unsigned rememberUnknownChunks;
+#endif /*LODEPNG_COMPILE_UNKNOWN_CHUNKS*/
+} LodePNG_DecodeSettings;
+
+void LodePNG_DecodeSettings_init(LodePNG_DecodeSettings* settings);
+
+/*
+The LodePNG_Decoder struct has most input and output parameters the decoder uses,
+such as the settings, the info of the PNG and the raw data, and the error. Only
+the pixel buffer is not contained in this struct.
+*/
+typedef struct LodePNG_Decoder
+{
+  LodePNG_DecodeSettings settings; /*the decoding settings*/
+  LodePNG_InfoRaw infoRaw; /*specifies the format in which you would like to get the raw pixel buffer*/
+  LodePNG_InfoPng infoPng; /*info of the PNG image obtained after decoding*/
+  unsigned error;
+} LodePNG_Decoder;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_Decoder_init(LodePNG_Decoder* decoder);
+void LodePNG_Decoder_cleanup(LodePNG_Decoder* decoder);
+void LodePNG_Decoder_copy(LodePNG_Decoder* dest, const LodePNG_Decoder* source);
+
+/*
+Decode based on a LodePNG_Decoder.
+This function allocates the out buffer and stores the size in *outsize. This buffer
+needs to be freed after usage.
+Other information about the PNG file, such as the size, colorType and extra chunks
+are stored in the infoPng field of the LodePNG_Decoder.
+*/
+void LodePNG_Decoder_decode(LodePNG_Decoder* decoder, unsigned char** out, size_t* outsize,
+                            const unsigned char* in, size_t insize);
+
+/*
+Read the PNG header, but not the actual data. This returns only the information
+that is in the header chunk of the PNG, such as width, height and color type. The
+information is placed in the infoPng field of the LodePNG_Decoder.
+*/
+void LodePNG_Decoder_inspect(LodePNG_Decoder* decoder, const unsigned char* in, size_t insize);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/* ////////////////////////////////////////////////////////////////////////// */
+/* LodePNG Encoder                                                            */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*Settings for the encoder.*/
+typedef struct LodePNG_EncodeSettings
+{
+  LodePNG_CompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
+
+  /*Brute-force-search PNG filters by compressing each filter for each scanline.
+  This gives better compression, at the cost of being super slow.
+  Don't enable this for normal image saving, compression can take minutes
+  instead of seconds. This is experimental. If enabled, compression still isn't
+  as good as some other PNG encoders and optimizers, except for some images.
+  If you enable this, also consider setting zlibsettings.windowSize to 32768, and consider
+  using a less than 24-bit per pixel colorType if the image has <= 256 colors, for optimal compression.
+  Default: 0 (false)*/
+  unsigned bruteForceFilters;
+
+  /*automatically use color type without alpha instead of given one, if given image is opaque*/
+  unsigned autoLeaveOutAlphaChannel;
+  /*force creating a PLTE chunk if colortype is 2 or 6 (= a suggested palette).
+  If colortype is 3, PLTE is _always_ created.*/
+  unsigned force_palette;
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+  /*add LodePNG version as text chunk*/
+  unsigned add_id;
+  /*encode text chunks as zTXt chunks instead of tEXt chunks, and use compression in iTXt chunks*/
+  unsigned text_compression;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNG_EncodeSettings;
+
+void LodePNG_EncodeSettings_init(LodePNG_EncodeSettings* settings);
+
+/*
+This struct has most input and output parameters the encoder uses,
+such as the settings, the info of the PNG and the raw data, and the error. Only
+the pixel buffer is not contained in this struct.
+*/
+typedef struct LodePNG_Encoder
+{
+  /*compression settings of the encoder*/
+  LodePNG_EncodeSettings settings;
+  /*the info specified by the user is not changed by the encoder. The encoder
+  will try to generate a PNG close to the given info.*/
+  LodePNG_InfoPng infoPng;
+  /*put the properties of the input raw image in here*/
+  LodePNG_InfoRaw infoRaw;
+  /*error value filled in if error happened, or 0 if all went ok*/
+  unsigned error;
+} LodePNG_Encoder;
+
+/*init, cleanup and copy functions to use with this struct*/
+void LodePNG_Encoder_init(LodePNG_Encoder* encoder);
+void LodePNG_Encoder_cleanup(LodePNG_Encoder* encoder);
+void LodePNG_Encoder_copy(LodePNG_Encoder* dest, const LodePNG_Encoder* source);
+
+/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/
+void LodePNG_Encoder_encode(LodePNG_Encoder* encoder, unsigned char** out, size_t* outsize,
+                            const unsigned char* image, unsigned w, unsigned h);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/* ////////////////////////////////////////////////////////////////////////// */
+/* Chunk Traversing Utilities                                                 */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+LodePNG_chunk functions:
+These functions need as input a large enough amount of allocated memory.
+These functions can be used on raw PNG data, but they are exposed in the API
+because they are needed if you want to traverse the unknown chunks stored
+in the LodePNG_UnknownChunks struct, or add new ones to it.
+*/
+
+/*get the length of the data of the chunk. Total chunk length has 12 bytes more.*/
+unsigned LodePNG_chunk_length(const unsigned char* chunk);
+
+/*puts the 4-byte type in null terminated string*/
+void LodePNG_chunk_type(char type[5], const unsigned char* chunk);
+
+/*check if the type is the given type*/
+unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type);
+
+/*
+These functions get properties of PNG chunks gotten from capitalization of chunk
+type name, as defined by the PNG standard.
+*/
+
+/*
+properties of PNG chunks gotten from capitalization of chunk type name, as defined by the standard
+0: ancillary chunk, 1: it's one of the critical chunk types
+*/
+unsigned char LodePNG_chunk_critical(const unsigned char* chunk);
+
+/*0: public, 1: private*/
+unsigned char LodePNG_chunk_private(const unsigned char* chunk);
+
+/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy*/
+unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk);
+
+/*get pointer to the data of the chunk*/
+unsigned char* LodePNG_chunk_data(unsigned char* chunk);
+
+/*get pointer to the data of the chunk*/
+const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk);
+
+/*returns 0 if the crc is correct, 1 if it's incorrect*/
+unsigned LodePNG_chunk_check_crc(const unsigned char* chunk);
+
+/*generates the correct CRC from the data and puts it in the last 4 bytes of the chunk*/
+void LodePNG_chunk_generate_crc(unsigned char* chunk);
+
+/*iterate to next chunks. don't use on IEND chunk, as there is no next chunk then*/
+unsigned char* LodePNG_chunk_next(unsigned char* chunk);
+const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk);
+
+/*
+Appends chunk to the data in out. The given chunk should already have its chunk header.
+The out variable and outlength are updated to reflect the new reallocated buffer.
+Returns error code (0 if it went ok)
+*/
+unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk);
+
+/*
+Appends new chunk to out. The chunk to append is given by giving its length, type
+and data separately. The type is a 4-letter string.
+The out variable and outlength are updated to reflect the new reallocated buffer.
+Returne error code (0 if it went ok)
+*/
+unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length,
+                              const char* type, const unsigned char* data);
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/* ////////////////////////////////////////////////////////////////////////// */
+/* Zlib encoder and decoder                                                   */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+/*
+This zlib part can be used independently to zlib compress and decompress a
+buffer. It cannot be used to create gzip files however, and it only supports the
+part of zlib that is required for PNG, it does not support dictionaries.
+*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Decompresses Zlib data. Reallocates the out buffer and appends the data. The
+data must be according to the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.*/
+unsigned LodePNG_zlib_decompress(unsigned char** out, size_t* outsize,
+                                 const unsigned char* in, size_t insize, const LodePNG_DecompressSettings* settings);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*Compresses data with Zlib. Reallocates the out buffer and appends the data.
+The data is output in the format of the zlib specification.
+Either, *out must be NULL and *outsize must be 0, or, *out must be a valid
+buffer and *outsize its size in bytes. out must be freed by user after usage.*/
+unsigned LodePNG_zlib_compress(unsigned char** out, size_t* outsize,
+                               const unsigned char* in, size_t insize, const LodePNG_CompressSettings* settings);
+#endif /*LODEPNG_COMPILE_ENCODER*/
+#endif /*LODEPNG_COMPILE_ZLIB*/
+
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Load a file from disk into buffer. The function allocates the out buffer, and
+after usage you are responsible for freeing it.
+out: output parameter, contains pointer to loaded buffer.
+outsize: output parameter, size of the allocated out buffer
+filename: the path to the file to load
+return value: error code (0 means ok)
+*/
+unsigned LodePNG_loadFile(unsigned char** out, size_t* outsize, const char* filename);
+
+/*
+Save a file from buffer to disk. Warning, if it exists, this function overwrites
+the file without warning!
+buffer: the buffer to write
+buffersize: size of the buffer to write
+filename: the path to the file to save to
+return value: error code (0 means ok)
+*/
+unsigned LodePNG_saveFile(const unsigned char* buffer, size_t buffersize, const char* filename);
+#endif /*LODEPNG_COMPILE_DISK*/
+
+#ifdef __cplusplus
+/* ////////////////////////////////////////////////////////////////////////// */
+/* LodePNG C++ wrapper                                                        */
+/* ////////////////////////////////////////////////////////////////////////// */
+
+//The LodePNG C++ wrapper uses classes with handy constructors and destructors
+//instead of manual init and cleanup functions, and uses std::vectors instead of
+//manually allocated memory buffers.
+
+namespace LodePNG
+{
+#ifdef LODEPNG_COMPILE_ZLIB
+//The C++ wrapper for the zlib part
+#ifdef LODEPNG_COMPILE_DECODER
+  //Zlib-decompress an unsigned char buffer
+  unsigned decompress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                      const LodePNG_DecompressSettings& settings = LodePNG_defaultDecompressSettings);
+
+  //Zlib-decompress an std::vector
+  unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                      const LodePNG_DecompressSettings& settings = LodePNG_defaultDecompressSettings);
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+  //Zlib-compress an unsigned char buffer
+  unsigned compress(std::vector<unsigned char>& out, const unsigned char* in, size_t insize,
+                    const LodePNG_CompressSettings& settings = LodePNG_defaultCompressSettings);
+
+  //Zlib-compress an std::vector
+  unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+                    const LodePNG_CompressSettings& settings = LodePNG_defaultCompressSettings);
+#endif //LODEPNG_COMPILE_ENCODER
+#endif //LODEPNG_COMPILE_ZLIB
+
+#ifdef LODEPNG_COMPILE_PNG
+#ifdef LODEPNG_COMPILE_DECODER
+  /*
+  Class to decode a PNG image. Before decoding, settings can be set and
+  after decoding, extra information about the PNG can be retrieved.
+  Extends from the C-struct LodePNG_Decoder to add constructors and destructors
+  to initialize/cleanup it automatically. Beware, no virtual destructor is used.
+  */
+  class Decoder : public LodePNG_Decoder
+  {
+    public:
+
+    Decoder();
+    ~Decoder();
+    void operator=(const LodePNG_Decoder& other);
+
+    //decode PNG buffer to raw out buffer. Width and height can be retrieved with getWidth() and
+    //getHeight() and error should be checked with hasError() and getError()
+    void decode(std::vector<unsigned char>& out, const unsigned char* in, size_t insize);
+
+    //decode PNG buffer to raw out buffer. Width and height can be retrieved with getWidth() and
+    //getHeight() and error should be checked with hasError() and getError()
+    void decode(std::vector<unsigned char>& out, const std::vector<unsigned char>& in);
+
+    //inspect functions: get only the info from the PNG header. The info can then be retrieved with
+    //the functions of this class.
+    void inspect(const unsigned char* in, size_t insize);
+
+    //inspect functions: get only the info from the PNG header. The info can then be retrieved with
+    //the functions of this class.
+    void inspect(const std::vector<unsigned char>& in);
+
+    //error checking after decoding
+    bool hasError() const;
+    unsigned getError() const;
+
+    //convenient access to some InfoPng parameters after decoding
+    unsigned getWidth() const; //width of image in pixels
+    unsigned getHeight() const; //height of image in pixels
+    unsigned getBpp(); //bits per pixel
+    unsigned getChannels(); //amount of channels
+    unsigned isGreyscaleType(); //is it a greyscale type? (colorType 0 or 4)
+    unsigned isAlphaType(); //has it an alpha channel? (colorType 2 or 6)
+
+    //getters and setters for the decoding settings
+    const LodePNG_DecodeSettings& getSettings() const;
+    LodePNG_DecodeSettings& getSettings();
+    void setSettings(const LodePNG_DecodeSettings& info);
+
+    //getters and setters for the PNG image info, after decoding this describes information of the PNG image
+    const LodePNG_InfoPng& getInfoPng() const;
+    LodePNG_InfoPng& getInfoPng();
+    void setInfoPng(const LodePNG_InfoPng& info);
+    void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng
+
+    //getters and setters for the raw image info, this determines in what format
+    //you get the pixel buffer from the decoder
+    const LodePNG_InfoRaw& getInfoRaw() const;
+    LodePNG_InfoRaw& getInfoRaw();
+    void setInfoRaw(const LodePNG_InfoRaw& info);
+  };
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+  /*
+  Class to encode a PNG image. Before encoding, settings can be set.
+  Extends from the C-struct LodePNG_Enoder to add constructors and destructors
+  to initialize/cleanup it automatically. Beware, no virtual destructor is used.
+  */
+  class Encoder : public LodePNG_Encoder
+  {
+    public:
+
+    Encoder();
+    ~Encoder();
+    void operator=(const LodePNG_Encoder& other);
+
+    //encoding image to PNG buffer
+    void encode(std::vector<unsigned char>& out, const unsigned char* image, unsigned w, unsigned h);
+
+    //encoding image to PNG buffer
+    void encode(std::vector<unsigned char>& out, const std::vector<unsigned char>& image, unsigned w, unsigned h);
+
+    //error checking after decoding
+    bool hasError() const;
+    unsigned getError() const;
+
+    //convenient direct access to some parameters of the InfoPng
+    void clearPalette();
+    void addPalette(unsigned char r, unsigned char g, unsigned char b, unsigned char a); //add 1 color to the palette
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+    void clearText();
+    void addText(const std::string& key, const std::string& str); //push back both texts at once
+    void clearIText();
+    void addIText(const std::string& key, const std::string& langtag,
+                  const std::string& transkey, const std::string& str);
+#endif //LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+    //getters and setters for the encoding settings
+    const LodePNG_EncodeSettings& getSettings() const;
+    LodePNG_EncodeSettings& getSettings();
+    void setSettings(const LodePNG_EncodeSettings& info);
+
+    //getters and setters for the PNG image info, this describes what color type
+    //and other settings the resulting PNG should have
+    const LodePNG_InfoPng& getInfoPng() const;
+    LodePNG_InfoPng& getInfoPng();
+    void setInfoPng(const LodePNG_InfoPng& info);
+    void swapInfoPng(LodePNG_InfoPng& info); //faster than copying with setInfoPng
+
+    //getters and setters for the raw image info, this describes how the encoder
+    //should interpret the input pixel buffer
+    const LodePNG_InfoRaw& getInfoRaw() const;
+    LodePNG_InfoRaw& getInfoRaw();
+    void setInfoRaw(const LodePNG_InfoRaw& info);
+  };
+#endif //LODEPNG_COMPILE_ENCODER
+
+#ifdef LODEPNG_COMPILE_DISK
+  /*
+  Load a file from disk into an std::vector. If the vector is empty, then either
+  the file doesn't exist or is an empty file.
+  */
+  void loadFile(std::vector<unsigned char>& buffer, const std::string& filename);
+
+  /*
+  Save the binary data in an std::vector to a file on disk. The file is overwritten
+  without warning.
+  */
+  void saveFile(const std::vector<unsigned char>& buffer, const std::string& filename);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_PNG
+} //namespace LodePNG
+#endif /*end of __cplusplus wrapper*/
+
+/*
+TODO:
+[.] test if there are no memory leaks or security exploits - done a lot but needs to be checked often
+[.] check compatibility with vareous compilers  - done but needs to be redone for every newer version
+[ ] LZ77 encoder more like the one described in zlib - to make sure it's patentfree
+[X] converting color to 16-bit per channel types
+[ ] read all public PNG chunk types (but never let the color profile and gamma ones touch RGB values)
+[ ] make sure encoder generates no chunks with size > (2^31)-1
+[ ] partial decoding (stream processing)
+[ ] let the "isFullyOpaque" function check color keys and transparent palettes too
+[X] better name for the variables "codes", "codesD", "codelengthcodes", "clcl" and "lldl"
+[ ] don't stop decoding on errors like 69, 57, 58 (make warnings)
+[ ] make option to choose if the raw image with non multiple of 8 bits per scanline should have padding bits or not
+[ ] let the C++ wrapper catch exceptions coming from the standard library and return LodePNG error codes
+*/
+
+#endif /*LODEPNG_H inclusion guard*/
+
+/*
+LodePNG Documentation
+---------------------
+
+This documentations contains background information and examples. For the function
+and class documentation, see the comments in the declarations above.
+
+0. table of contents
+--------------------
+
+  1. about
+   1.1. supported features
+   1.2. features not supported
+  2. C and C++ version
+  3. security
+  4. decoding
+  5. encoding
+  6. color conversions
+    6.1. PNG color types
+    6.2. Default Behaviour of LodePNG
+    6.3. Color Conversions
+    6.4. More Notes
+  7. error values
+  8. chunks and PNG editing
+  9. compiler support
+  10. examples
+   10.1. decoder C++ example
+   10.2. encoder C++ example
+   10.3. decoder C example
+  11. changes
+  12. contact information
+
+
+1. about
+--------
+
+PNG is a file format to store raster images losslessly with good compression,
+supporting different color types. It can be implemented in a patent-free way.
+
+LodePNG is a PNG codec according to the Portable Network Graphics (PNG)
+Specification (Second Edition) - W3C Recommendation 10 November 2003.
+
+The specifications used are:
+
+*) Portable Network Graphics (PNG) Specification (Second Edition):
+     http://www.w3.org/TR/2003/REC-PNG-20031110
+*) RFC 1950 ZLIB Compressed Data Format version 3.3:
+     http://www.gzip.org/zlib/rfc-zlib.html
+*) RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3:
+     http://www.gzip.org/zlib/rfc-deflate.html
+
+The most recent version of LodePNG can currently be found at
+http://members.gamedev.net/lode/projects/LodePNG/
+
+LodePNG works both in C (ISO C90) and C++, with a C++ wrapper that adds
+extra functionality.
+
+LodePNG exists out of two files:
+-lodepng.h: the header file for both C and C++
+-lodepng.c(pp): give it the name lodepng.c or lodepng.cpp (or .cc) depending on your usage
+
+If you want to start using LodePNG right away without reading this doc, get the
+files lodepng_examples.c or lodepng_examples.cpp to see how to use it in code,
+or check the (smaller) examples in chapter 13 here.
+
+LodePNG is simple but only supports the basic requirements. To achieve
+simplicity, the following design choices were made: There are no dependencies
+on any external library. To decode PNGs, there's a Decoder struct or class that
+can convert any PNG file data into an RGBA image buffer with a single function
+call. To encode PNGs, there's an Encoder struct or class that can convert image
+data into PNG file data with a single function call. To read and write files,
+there are simple functions to convert the files to/from buffers in memory.
+
+This all makes LodePNG suitable for loading textures in games, demoscene
+productions, saving a screenshot, images in programs that require them for simple
+usage, ... It's less suitable for full fledged image editors, loading PNGs
+over network (it requires all the image data to be available before decoding can
+begin), life-critical systems, ...
+LodePNG has a standards conformant decoder and encoder, and supports the ability
+to make a somewhat conformant editor.
+
+1.1. supported features
+-----------------------
+
+The following features are supported by the decoder:
+
+*) decoding of PNGs with any color type, bit depth and interlace mode, to a 24- or 32-bit color raw image,
+   or the same color type as the PNG
+*) encoding of PNGs, from any raw image to 24- or 32-bit color, or the same color type as the raw image
+*) Adam7 interlace and deinterlace for any color type
+*) loading the image from harddisk or decoding it from a buffer from other sources than harddisk
+*) support for alpha channels, including RGBA color model, translucent palettes and color keying
+*) zlib decompression (inflate)
+*) zlib compression (deflate)
+*) CRC32 and ADLER32 checksums
+*) handling of unknown chunks, allowing making a PNG editor that stores custom and unknown chunks.
+*) the following chunks are supported (generated/interpreted) by both encoder and decoder:
+    IHDR: header information
+    PLTE: color palette
+    IDAT: pixel data
+    IEND: the final chunk
+    tRNS: transparency for palettized images
+    tEXt: textual information
+    zTXt: compressed textual information
+    iTXt: international textual information
+    bKGD: suggested background color
+    pHYs: physical dimensions
+    tIME: modification time
+
+1.2. features not supported
+---------------------------
+
+The following features are _not_ supported:
+
+*) some features needed to make a conformant PNG-Editor might be still missing.
+*) partial loading/stream processing. All data must be available and is processed in one call.
+*) The following public chunks are not supported but treated as unknown chunks by LodePNG
+    cHRM, gAMA, iCCP, sRGB, sBIT, hIST, sPLT
+
+
+2. C and C++ version
+--------------------
+
+The C version uses buffers allocated with alloc that you need to free()
+yourself. On top of that, you need to use init and cleanup functions for each
+struct whenever using a struct from the C version to avoid exploits and memory leaks.
+
+The C++ version has constructors and destructors that take care of these things,
+and uses std::vectors in the interface for storing data.
+
+Both the C and the C++ version are contained in this file! The C++ code depends on
+the C code, the C code works on its own.
+
+These files work without modification for both C and C++ compilers because all the
+additional C++ code is in "#ifdef __cplusplus" blocks that make C-compilers ignore
+it, and the C code is made to compile both with strict ISO C90 and C++.
+
+To use the C++ version, you need to rename the source file to lodepng.cpp (instead
+of lodepng.c), and compile it with a C++ compiler.
+
+To use the C version, you need to rename the source file to lodepng.c (instead
+of lodepng.cpp), and compile it with a C compiler.
+
+
+3. Security
+-----------
+
+As with most software, even if carefully designed, it's always possible that
+LodePNG may contain possible exploits.
+
+If you discover a possible exploit, please let me know, and it will be fixed.
+
+When using LodePNG, care has to be taken with the C version of LodePNG, as well as the C-style
+structs when working with C++. The following conventions are used for all C-style structs:
+
+-if a struct has a corresponding init function, always call the init function when making a new one, to avoid exploits
+-if a struct has a corresponding cleanup function, call it before the struct disappears to avoid memory leaks
+-if a struct has a corresponding copy function, use the copy function instead of "=".
+ The destination must also be inited already!
+
+4. Decoding
+-----------
+
+Decoding converts a PNG compressed image to a raw pixel buffer.
+
+Most documentation on using the decoder is at its declarations in the header
+above. For C, simple decoding can be done with functions such as LodePNG_decode32,
+and more advanced decoding can be done with the struct LodePNG_Decoder and its
+functions. For C++, simple decoding can be done with the LodePNG::decode functions
+and advanced decoding with the LodePNG::Decoder class.
+
+The Decoder contains 3 components:
+*) LodePNG_InfoPng: it stores information about the PNG (the input) in an LodePNG_InfoPng struct,
+   don't modify this one yourself
+*) Settings: you can specify a few other settings for the decoder to use
+*) LodePNG_InfoRaw: here you can say what type of raw image (the output) you want to get
+
+Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color".
+In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their
+init and cleanup functions, but normally you use the ones in the decoder that are already handled
+in the init and cleanup functions of the decoder itself.
+
+=LodePNG_InfoPng=
+
+This contains information such as the original color type of the PNG image, text
+comments, suggested background color, etc... More details about the LodePNG_InfoPng struct
+are at its declaration documentation.
+
+Because the dimensions of the image are important, there are shortcuts to get them in the
+C++ version: use decoder.getWidth() and decoder.getHeight().
+In the C version, use decoder.infoPng.width and decoder.infoPng.height.
+
+=LodePNG_InfoRaw=
+
+In the LodePNG_InfoRaw struct of the Decoder, you can specify which color type you want
+the resulting raw image to be. If this is different from the colorType of the
+PNG, then the decoder will automatically convert the result to your LodePNG_InfoRaw
+settings. Not all combinations of color conversions are supported though, see
+a different section for information about the color modes and supported conversions.
+
+Palette of LodePNG_InfoRaw isn't used by the Decoder, when converting from palette color
+to palette color, the values of the pixels are left untouched so that the colors
+will change if the palette is different. Color key of LodePNG_InfoRaw is not used by the
+Decoder. If setting color_convert is false then LodePNG_InfoRaw is completely ignored,
+but it will be modified to match the color type of the PNG so will be overwritten.
+
+By default, 32-bit color is used for the result.
+
+=Settings=
+
+The Settings can be used to ignore the errors created by invalid CRC and Adler32
+chunks, and to disable the decoding of tEXt chunks.
+
+There's also a setting color_convert, true by default. If false, no conversion
+is done, the resulting data will be as it was in the PNG (after decompression)
+and you'll have to puzzle the colors of the pixels together yourself using the
+color type information in the LodePNG_InfoPng.
+
+
+5. Encoding
+-----------
+
+Encoding converts a raw pixel buffer to a PNG compressed image.
+
+Most documentation on using the encoder is at its declarations in the header
+above. For C, simple encoding can be done with functions such as LodePNG_encode32,
+and more advanced decoding can be done with the struct LodePNG_Encoder and its
+functions. For C++, simple encoding can be done with the LodePNG::encode functions
+and advanced decoding with the LodePNG::Encoder class.
+
+Like the decoder, the encoder can also give errors. However it gives less errors
+since the encoder input is trusted, the decoder input (a PNG image that could
+be forged by anyone) is not trusted.
+
+Like the Decoder, the Encoder has 3 components:
+*) LodePNG_InfoRaw: here you say what color type of the raw image (the input) has
+*) Settings: you can specify a few settings for the encoder to use
+*) LodePNG_InfoPng: the same LodePNG_InfoPng struct as created by the Decoder. For the encoder,
+with this you specify how you want the PNG (the output) to be.
+
+Some of the parameters described below may be inside the sub-struct "LodePNG_InfoColor color".
+In the C and C++ version, when using Info structs outside of the decoder or encoder, you need to use their
+init and cleanup functions, but normally you use the ones in the encoder that are already handled
+in the init and cleanup functions of the decoder itself.
+
+=LodePNG_InfoPng=
+
+The Decoder class stores information about the PNG image in an LodePNG_InfoPng object. With
+the Encoder you can do the opposite: you give it an LodePNG_InfoPng object, and it'll try
+to match the LodePNG_InfoPng you give as close as possible in the PNG it encodes. For
+example in the LodePNG_InfoPng you can specify the color type you want to use, possible
+tEXt chunks you want the PNG to contain, etc... For an explanation of all the
+values in LodePNG_InfoPng see a further section. Not all PNG color types are supported
+by the Encoder.
+
+The encoder will not always exactly match the LodePNG_InfoPng struct you give,
+it tries as close as possible. Some things are ignored by the encoder. The width
+and height of LodePNG_InfoPng are ignored as well, because instead the width and
+height of the raw image you give in the input are used. In fact the encoder
+currently uses only the following settings from it:
+-colorType and bitDepth: the ones it supports
+-text chunks, that you can add to the LodePNG_InfoPng with "addText"
+-the color key, if applicable for the given color type
+-the palette, if you encode to a PNG with colorType 3
+-the background color: it'll add a bKGD chunk to the PNG if one is given
+-the interlaceMethod: None (0) or Adam7 (1)
+
+When encoding to a PNG with colorType 3, the encoder will generate a PLTE chunk.
+If the palette contains any colors for which the alpha channel is not 255 (so
+there are translucent colors in the palette), it'll add a tRNS chunk.
+
+=LodePNG_InfoRaw=
+
+You specify the color type of the raw image that you give to the input here,
+including a possible transparent color key and palette you happen to be using in
+your raw image data.
+
+By default, 32-bit color is assumed, meaning your input has to be in RGBA
+format with 4 bytes (unsigned chars) per pixel.
+
+=Settings=
+
+The following settings are supported (some are in sub-structs):
+*) autoLeaveOutAlphaChannel: when this option is enabled, when you specify a PNG
+color type with alpha channel (not to be confused with the color type of the raw
+image you specify!!), but the encoder detects that all pixels of the given image
+are opaque, then it'll automatically use the corresponding type without alpha
+channel, resulting in a smaller PNG image.
+*) btype: the block type for LZ77.
+   0 = uncompressed, 1 = fixed huffman tree, 2 = dynamic huffman tree (best compression)
+*) useLZ77: whether or not to use LZ77 for compressed block types
+*) windowSize: the window size used by the LZ77 encoder (1 - 32768)
+*) force_palette: if colorType is 2 or 6, you can make the encoder write a PLTE
+   chunk if force_palette is true. This can used as suggested palette to convert
+   to by viewers that don't support more than 256 colors (if those still exist)
+*) add_id: add text chunk "Encoder: LodePNG <version>" to the image.
+*) text_compression: default 0. If 1, it'll store texts as zTXt instead of tEXt chunks.
+  zTXt chunks use zlib compression on the text. This gives a smaller result on
+  large texts but a larger result on small texts (such as a single program name).
+  It's all tEXt or all zTXt though, there's no separate setting per text yet.
+
+
+6. color conversions
+--------------------
+
+In LodePNG, the color mode (bits, channels and palette) used in the PNG image,
+and the color mode used in the raw data, are separate and independently
+configurable. Therefore, LodePNG needs to do conversions from one color mode to
+another. Not all possible conversions are supported (e.g. converting to a palette
+or a lower bit depth isn't supported). This section will explain which conversions
+are supported and how to configure this. This explains for example when LodePNG
+uses the settings in LodePNG_InfoPng, LodePNG_InfoRaw and Settings.
+
+6.1. PNG color types
+--------------------
+
+A PNG image can have many color types, ranging from 1-bit color to 64-bit color,
+as well as palettized color modes. After the zlib decompression and unfiltering
+in the PNG image is done, the raw pixel data will have that color type and thus
+a certain amount of bits per pixel. If you want the output raw image after
+decoding to have another color type, a conversion is done by LodePNG.
+
+The PNG specification mentions the following color types:
+
+0: greyscale, bit depths 1, 2, 4, 8, 16
+2: RGB, bit depths 8 and 16
+3: palette, bit depths 1, 2, 4 and 8
+4: greyscale with alpha, bit depths 8 and 16
+6: RGBA, bit depths 8 and 16
+
+Bit depth is the amount of bits per pixel per color channel. So the total amount
+of bits per pixel = amount of channels * bitDepth.
+
+6.2. Default Behaviour of LodePNG
+---------------------------------
+
+By default, the Decoder will convert the data from the PNG to 32-bit RGBA color,
+no matter what color type the PNG has, so that the result can be used directly
+as a texture in OpenGL etc... without worries about what color type the original
+image has.
+
+The Encoder assumes by default that the raw input you give it is a 32-bit RGBA
+buffer and will store the PNG as either 32 bit or 24 bit depending on whether
+or not any translucent pixels were detected in it.
+
+To get the default behaviour, don't change the values of LodePNG_InfoRaw and
+LodePNG_InfoPng of the encoder, and don't change the values of LodePNG_InfoRaw
+of the decoder.
+
+6.3. Color Conversions
+----------------------
+
+As explained in the sections about the Encoder and Decoder, you can specify
+color types and bit depths in LodePNG_InfoPng and LodePNG_InfoRaw, to change the default behaviour
+explained above. (for the Decoder you can only specify the LodePNG_InfoRaw, because the
+LodePNG_InfoPng contains what the PNG file has).
+
+To avoid some confusion:
+-the Decoder converts from PNG to raw image
+-the Encoder converts from raw image to PNG
+-the color type and bit depth in LodePNG_InfoRaw, are those of the raw image
+-the color type and bit depth in LodePNG_InfoPng, are those of the PNG
+-if the color type of the LodePNG_InfoRaw and PNG image aren't the same, a conversion
+between the color types is done if the color types are supported. If it is not
+supported, an error is returned. If the types are the same, no conversion is done
+and this is supported for any color type.
+
+Supported color conversions:
+-It's possible to load PNGs from any colortype and to save PNGs of any colorType.
+-Both encoder and decoder use the same converter. So both encoder and decoder
+suport the same color types at the input and the output. So the decoder supports
+any type of PNG image and can convert it to certain types of raw image, while the
+encoder supports any type of raw data but only certain color types for the output PNG.
+-The converter can convert from _any_ input color type, to 24-bit RGB or 32-bit RGBA (8 bits per channel)
+-The converter can convert from _any_ input color type, to 48-bit RGB or 64-bit RGBA (16 bits per channel)
+-The converter can convert from greyscale input color type, to 8-bit greyscale or greyscale with alpha
+-The converter can convert from greyscale input color type, to 16-bit greyscale or greyscale with alpha
+-If both color types are the same, conversion from anything to anything is possible
+-Color types that are invalid according to the PNG specification are not allowed
+-When converting from a type with alpha channel to one without, the alpha channel information is discarded
+-When converting from a type without alpha channel to one with, the result will be opaque except
+ pixels that have the same color as the color key of the input if one was given
+-When converting from 16-bit bitDepth to 8-bit bitDepth, the 16-bit precision information is lost,
+ only the most significant byte is kept
+-When converting from 8-bit bitDepth to 16-bit bitDepth, the 8-bit byte is duplicated, so that 0 stays 0, and
+ the 8-bit maximum 255 is converted to the 16-bit maximum 65535. Something similar happens at bit level for
+ converting very low bit depths to 8 or 16 bit.
+-Converting from color to greyscale or to palette is not supported on purpose: there are multiple possible
+ algorithms to do this color reduction, LodePNG does not want to pick one and leaves this choice to the
+ user instead, because it's beyond the scope of PNG encoding.
+-Converting from a palette to a palette, only keeps the indices, it ignores the colors defined in the
+ palette without giving an error
+
+No conversion needed...:
+-If the color type of the PNG image and raw image are the same, then no
+conversion is done, and all color types are supported.
+-In the encoder, you can make it save a PNG with any color by giving the
+LodePNG_InfoRaw and LodePNG_InfoPng the same color type.
+-In the decoder, you can make it store the pixel data in the same color type
+as the PNG has, by setting the color_convert setting to false. Settings in
+infoRaw are then ignored.
+
+The function LodePNG_convert does this, which is available in the interface but
+normally isn't needed since the encoder and decoder already call it.
+
+6.4. More Notes
+---------------
+
+In the PNG file format, if a less than 8-bit per pixel color type is used and the scanlines
+have a bit amount that isn't a multiple of 8, then padding bits are used so that each
+scanline starts at a fresh byte. But that is NOT true for the LodePNG input and output!
+The raw input image you give to the encoder, and the raw output image you get from the decoder
+will NOT have these padding bits, e.g. in the case of a 1-bit image with a width
+of 7 pixels, the first pixel of the second scanline will the the 8th bit of the first byte,
+not the first bit of a new byte.
+
+7. error values
+---------------
+
+All functions in LodePNG that return an error code, return 0 if everything went
+OK, or one of the code defined by LodePNG if there was an error.
+
+The meaning of the LodePNG error values can be retrieved with the function
+LodePNG_error_text: given the numerical error code, it returns a description
+of the error in English as a string.
+
+Check the implementation of LodePNG_error_text to see the meaning of each error code.
+
+
+8. chunks and PNG editing
+-------------------------
+
+If you want to add extra chunks to a PNG you encode, or use LodePNG for a PNG
+editor that should follow the rules about handling of unknown chunks, or if you
+program is able to read other types of chunks than the ones handled by LodePNG,
+then that's possible with the chunk functions of LodePNG.
+
+A PNG chunk has the following layout:
+
+4 bytes length
+4 bytes type name
+length bytes data
+4 bytes CRC
+
+
+8.1. iterating through chunks
+-----------------------------
+
+If you have a buffer containing the PNG image data, then the first chunk (the
+IHDR chunk) starts at byte number 8 of that buffer. The first 8 bytes are the
+signature of the PNG and are not part of a chunk. But if you start at byte 8
+then you have a chunk, and can check the following things of it.
+
+NOTE: none of these functions check for memory buffer boundaries. To avoid
+exploits, always make sure the buffer contains all the data of the chunks.
+When using LodePNG_chunk_next, make sure the returned value is within the
+allocated memory.
+
+unsigned LodePNG_chunk_length(const unsigned char* chunk):
+
+Get the length of the chunk's data. The total chunk length is this length + 12.
+
+void LodePNG_chunk_type(char type[5], const unsigned char* chunk):
+unsigned char LodePNG_chunk_type_equals(const unsigned char* chunk, const char* type):
+
+Get the type of the chunk or compare if it's a certain type
+
+unsigned char LodePNG_chunk_critical(const unsigned char* chunk):
+unsigned char LodePNG_chunk_private(const unsigned char* chunk):
+unsigned char LodePNG_chunk_safetocopy(const unsigned char* chunk):
+
+Check if the chunk is critical in the PNG standard (only IHDR, PLTE, IDAT and IEND are).
+Check if the chunk is private (public chunks are part of the standard, private ones not).
+Check if the chunk is safe to copy. If it's not, then, when modifying data in a critical
+chunk, unsafe to copy chunks of the old image may NOT be saved in the new one if your
+program doesn't handle that type of unknown chunk.
+
+unsigned char* LodePNG_chunk_data(unsigned char* chunk):
+const unsigned char* LodePNG_chunk_data_const(const unsigned char* chunk):
+
+Get a pointer to the start of the data of the chunk.
+
+unsigned LodePNG_chunk_check_crc(const unsigned char* chunk):
+void LodePNG_chunk_generate_crc(unsigned char* chunk):
+
+Check if the crc is correct or generate a correct one.
+
+unsigned char* LodePNG_chunk_next(unsigned char* chunk):
+const unsigned char* LodePNG_chunk_next_const(const unsigned char* chunk):
+
+Iterate to the next chunk. This works if you have a buffer with consecutive chunks. Note that these
+functions do no boundary checking of the allocated data whatsoever, so make sure there is enough
+data available in the buffer to be able to go to the next chunk.
+
+unsigned LodePNG_append_chunk(unsigned char** out, size_t* outlength, const unsigned char* chunk):
+unsigned LodePNG_create_chunk(unsigned char** out, size_t* outlength, unsigned length,
+                              const char* type, const unsigned char* data):
+
+These functions are used to create new chunks that are appended to the data in *out that has
+length *outlength. The append function appends an existing chunk to the new data. The create
+function creates a new chunk with the given parameters and appends it. Type is the 4-letter
+name of the chunk.
+
+
+8.2. chunks in infoPng
+----------------------
+
+The LodePNG_InfoPng struct contains a struct LodePNG_UnknownChunks in it. This
+struct has 3 buffers (each with size) to contain 3 types of unknown chunks:
+the ones that come before the PLTE chunk, the ones that come between the PLTE
+and the IDAT chunks, and the ones that come after the IDAT chunks.
+It's necessary to make the distionction between these 3 cases because the PNG
+standard forces to keep the ordering of unknown chunks compared to the critical
+chunks, but does not force any other ordering rules.
+
+infoPng.unknown_chunks.data[0] is the chunks before PLTE
+infoPng.unknown_chunks.data[1] is the chunks after PLTE, before IDAT
+infoPng.unknown_chunks.data[2] is the chunks after IDAT
+
+The chunks in these 3 buffers can be iterated through and read by using the same
+way described in the previous subchapter.
+
+When using the decoder to decode a PNG, you can make it store all unknown chunks
+if you set the option settings.rememberUnknownChunks to 1. By default, this option
+is off and is 0.
+
+The encoder will always encode unknown chunks that are stored in the infoPng. If
+you need it to add a particular chunk that isn't known by LodePNG, you can use
+LodePNG_append_chunk or LodePNG_create_chunk to the chunk data in
+infoPng.unknown_chunks.data[x].
+
+Chunks that are known by LodePNG should not be added in that way. E.g. to make
+LodePNG add a bKGD chunk, set background_defined to true and add the correct
+parameters there and LodePNG will generate the chunk.
+
+
+9. compiler support
+-------------------
+
+No libraries other than the current standard C library are needed to compile
+LodePNG. For the C++ version, only the standard C++ library is needed on top.
+Add the files lodepng.c(pp) and lodepng.h to your project, include
+lodepng.h where needed, and your program can read/write PNG files.
+
+Use optimization! For both the encoder and decoder, compiling with the best
+optimizations makes a large difference.
+
+Make sure that LodePNG is compiled with the same compiler of the same version
+and with the same settings as the rest of the program, or the interfaces with
+std::vectors and std::strings in C++ can be incompatible resulting in bad things.
+
+CHAR_BITS must be 8 or higher, because LodePNG uses unsigned chars for octets.
+
+*) gcc and g++
+
+LodePNG is developed in gcc so this compiler is natively supported. It gives no
+warnings with compiler options "-Wall -Wextra -pedantic -ansi", with gcc and g++
+version 4.5.1 on Linux.
+
+*) Mingw and Bloodshed DevC++
+
+The Mingw compiler (a port of gcc) used by Bloodshed DevC++ for Windows is fully
+supported by LodePNG.
+
+*) Visual Studio 2005 and Visual C++ 2005 Express Edition
+
+Versions 20070604 up to 20080107 have been tested on VS2005 and work. Visual
+studio may give warnings about 'fopen' being deprecated. A multiplatform library
+can't support the proposed Visual Studio alternative however.
+
+If you're using LodePNG in VS2005 and don't want to see the deprecated warnings,
+put this on top of lodepng.h before the inclusions: #define _CRT_SECURE_NO_DEPRECATE
+
+*) Visual Studio 6.0
+
+The C++ version of LodePNG was not supported by Visual Studio 6.0 because Visual
+Studio 6.0 doesn't follow the C++ standard and implements it incorrectly.
+The current C version of LodePNG has not been tested in VS6 but may work now.
+
+*) Comeau C/C++
+
+Vesion 20070107 compiles without problems on the Comeau C/C++ Online Test Drive
+at http://www.comeaucomputing.com/tryitout in both C90 and C++ mode.
+
+*) Compilers on Macintosh
+
+LodePNG has been reported to work both with the gcc and LLVM for Macintosh, both
+for C and C++.
+
+*) Other Compilers
+
+If you encounter problems on other compilers, I'm happy to help out make LodePNG
+support the compiler if it supports the ISO C90 and C++ standard well enough and
+the required modification doesn't require using non standard or less good C/C++
+code or headers.
+
+
+10. examples
+------------
+
+This decoder and encoder example show the most basic usage of LodePNG (using the
+classes, not the simple functions, which would be trivial)
+
+More complex examples can be found in:
+-lodepng_examples.c: 9 different examples in C, such as showing the image with SDL, ...
+-lodepng_examples.cpp: the same examples in C++ using the C++ wrapper of LodePNG
+
+These files can be found on the LodePNG website or searched for on the internet.
+
+10.1. decoder C++ example
+-------------------------
+
+////////////////////////////////////////////////////////////////////////////////
+#include "lodepng.h"
+#include <iostream>
+
+int main(int argc, char *argv[])
+{
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  //load and decode
+  std::vector<unsigned char> buffer, image; //buffer will contain the PNG file, image will contain the raw pixels
+  LodePNG::loadFile(buffer, filename); //load the image file with given filename
+  LodePNG::Decoder decoder;
+  decoder.decode(image, buffer.size() ? &buffer[0] : 0, (unsigned)buffer.size()); //decode the png
+
+  //if there's an error, display it
+  if(decoder.hasError())
+    std::cout << "error " << decoder.getError() << ": "<< LodePNG_error_text(decoder.getError()) << std::endl;
+
+  int width = decoder.getWidth(); //get the width in pixels
+  int height = decoder.getHeight(); //get the height in pixels
+  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
+}
+
+//alternative version using the "simple" function
+int main(int argc, char *argv[])
+{
+  const char* filename = argc > 1 ? argv[1] : "test.png";
+
+  //load and decode
+  std::vector<unsigned char> image;
+  unsigned width, height;
+  unsigned error = LodePNG::decode(image, width, height, filename);
+
+  //if there's an error, display it
+  if(error != 0) std::cout << "error " << error << ": " << LodePNG_error_text(error) << std::endl;
+
+  //the pixels are now in the vector "image", 4 bytes per pixel, ordered RGBARGBA..., use it as texture, draw it, ...
+}
+////////////////////////////////////////////////////////////////////////////////
+
+
+10.2. encoder C++ example
+-------------------------
+
+////////////////////////////////////////////////////////////////////////////////
+#include "lodepng.h"
+#include <iostream>
+
+//saves image to filename given as argument. Warning, this overwrites the file without warning!
+int main(int argc, char *argv[])
+{
+  //check if user gave a filename
+  if(argc <= 1)
+  {
+    std::cout << "please provide a filename to save to\n";
+    return 0;
+  }
+
+  //generate some image
+  std::vector<unsigned char> image;
+  image.resize(512 * 512 * 4);
+  for(unsigned y = 0; y < 512; y++)
+  for(unsigned x = 0; x < 512; x++)
+  {
+    image[4 * 512 * y + 4 * x + 0] = 255 * !(x & y);
+    image[4 * 512 * y + 4 * x + 1] = x ^ y;
+    image[4 * 512 * y + 4 * x + 2] = x | y;
+    image[4 * 512 * y + 4 * x + 3] = 255;
+  }
+
+  //encode and save, using the Encoder class
+  std::vector<unsigned char> buffer;
+  LodePNG::Encoder encoder;
+  encoder.encode(buffer, image, 512, 512);
+  LodePNG::saveFile(buffer, argv[1]);
+
+  //the same as the 4 lines of code above, but in 1 call without the class:
+  //LodePNG::encode(argv[1], image, 512, 512);
+}
+////////////////////////////////////////////////////////////////////////////////
+
+
+10.3. Decoder C example
+-----------------------
+
+This example loads the PNG from a file into a pixel buffer in 1 function call
+
+#include "lodepng.h"
+
+int main(int argc, char *argv[])
+{
+  unsigned error;
+  unsigned char* image;
+  size_t width, height;
+
+  if(argc <= 1) return 0;
+
+  error = LodePNG_decode32_file(&image, &width, &height, filename);
+
+  if(error != 0) printf("error %u: %s\n", error, LodePNG_error_text(error));
+
+  //use image here
+
+  free(image);
+}
+
+
+11. changes
+-----------
+
+The version number of LodePNG is the date of the change given in the format
+yyyymmdd.
+
+Some changes aren't backwards compatible. Those are indicated with a (!)
+symbol.
+
+*) 8 sep 2011: lz77 encoder lazy matching instead of greedy matching.
+*) 23 aug 2011: tweaked the zlib compression parameters after benchmarking.
+    A bug with the PNG filtertype heuristic was fixed, so that it chooses much
+    better ones (it's quite significant). A setting to do an experimental, slow,
+    brute force search for PNG filter types is added.
+*) 17 aug 2011 (!): changed some C zlib related function names.
+*) 16 aug 2011: made the code less wide (max 120 characters per line).
+*) 17 apr 2011: code cleanup. Bugfixes. Convert low to 16-bit per sample colors.
+*) 21 feb 2011: fixed compiling for C90. Fixed compiling with sections disabled.
+*) 11 dec 2010: encoding is made faster, based on suggestion by Peter Eastman
+    to optimize long sequences of zeros.
+*) 13 nov 2010: added LodePNG_InfoColor_hasPaletteAlpha and
+    LodePNG_InfoColor_canHaveAlpha functions for convenience.
+*) 7 nov 2010: added LodePNG_error_text function to get error code description.
+*) 30 okt 2010: made decoding slightly faster
+*) 26 okt 2010: (!) changed some C function and struct names (more consistent).
+     Reorganized the documentation and the declaration order in the header.
+*) 08 aug 2010: only changed some comments and external samples.
+*) 05 jul 2010: fixed bug thanks to warnings in the new gcc version.
+*) 14 mar 2010: fixed bug where too much memory was allocated for char buffers.
+*) 02 sep 2008: fixed bug where it could create empty tree that linux apps could
+    read by ignoring the problem but windows apps couldn't.
+*) 06 jun 2008: added more error checks for out of memory cases.
+*) 26 apr 2008: added a few more checks here and there to ensure more safety.
+*) 06 mar 2008: crash with encoding of strings fixed
+*) 02 feb 2008: support for international text chunks added (iTXt)
+*) 23 jan 2008: small cleanups, and #defines to divide code in sections
+*) 20 jan 2008: support for unknown chunks allowing using LodePNG for an editor.
+*) 18 jan 2008: support for tIME and pHYs chunks added to encoder and decoder.
+*) 17 jan 2008: ability to encode and decode compressed zTXt chunks added
+    Also vareous fixes, such as in the deflate and the padding bits code.
+*) 13 jan 2008: Added ability to encode Adam7-interlaced images. Improved
+    filtering code of encoder.
+*) 07 jan 2008: (!) changed LodePNG to use ISO C90 instead of C++. A
+    C++ wrapper around this provides an interface almost identical to before.
+    Having LodePNG be pure ISO C90 makes it more portable. The C and C++ code
+    are together in these files but it works both for C and C++ compilers.
+*) 29 dec 2007: (!) changed most integer types to unsigned int + other tweaks
+*) 30 aug 2007: bug fixed which makes this Borland C++ compatible
+*) 09 aug 2007: some VS2005 warnings removed again
+*) 21 jul 2007: deflate code placed in new namespace separate from zlib code
+*) 08 jun 2007: fixed bug with 2- and 4-bit color, and small interlaced images
+*) 04 jun 2007: improved support for Visual Studio 2005: crash with accessing
+    invalid std::vector element [0] fixed, and level 3 and 4 warnings removed
+*) 02 jun 2007: made the encoder add a tag with version by default
+*) 27 may 2007: zlib and png code separated (but still in the same file),
+    simple encoder/decoder functions added for more simple usage cases
+*) 19 may 2007: minor fixes, some code cleaning, new error added (error 69),
+    moved some examples from here to lodepng_examples.cpp
+*) 12 may 2007: palette decoding bug fixed
+*) 24 apr 2007: changed the license from BSD to the zlib license
+*) 11 mar 2007: very simple addition: ability to encode bKGD chunks.
+*) 04 mar 2007: (!) tEXt chunk related fixes, and support for encoding
+    palettized PNG images. Plus little interface change with palette and texts.
+*) 03 mar 2007: Made it encode dynamic Huffman shorter  with repeat codes.
+    Fixed a bug where the end code of a block had length 0 in the Huffman tree.
+*) 26 feb 2007: Huffman compression with dynamic trees (BTYPE 2) now implemented
+    and supported by the encoder, resulting in smaller PNGs at the output.
+*) 27 jan 2007: Made the Adler-32 test faster so that a timewaste is gone.
+*) 24 jan 2007: gave encoder an error interface. Added color conversion from any
+    greyscale type to 8-bit greyscale with or without alpha.
+*) 21 jan 2007: (!) Totally changed the interface. It allows more color types
+    to convert to and is more uniform. See the manual for how it works now.
+*) 07 jan 2007: Some cleanup & fixes, and a few changes over the last days:
+    encode/decode custom tEXt chunks, separate classes for zlib & deflate, and
+    at last made the decoder give errors for incorrect Adler32 or Crc.
+*) 01 jan 2007: Fixed bug with encoding PNGs with less than 8 bits per channel.
+*) 29 dec 2006: Added support for encoding images without alpha channel, and
+    cleaned out code as well as making certain parts faster.
+*) 28 dec 2006: Added "Settings" to the encoder.
+*) 26 dec 2006: The encoder now does LZ77 encoding and produces much smaller files now.
+    Removed some code duplication in the decoder. Fixed little bug in an example.
+*) 09 dec 2006: (!) Placed output parameters of public functions as first parameter.
+    Fixed a bug of the decoder with 16-bit per color.
+*) 15 okt 2006: Changed documentation structure
+*) 09 okt 2006: Encoder class added. It encodes a valid PNG image from the
+    given image buffer, however for now it's not compressed.
+*) 08 sep 2006: (!) Changed to interface with a Decoder class
+*) 30 jul 2006: (!) LodePNG_InfoPng , width and height are now retrieved in different
+    way. Renamed decodePNG to decodePNGGeneric.
+*) 29 jul 2006: (!) Changed the interface: image info is now returned as a
+    struct of type LodePNG::LodePNG_Info, instead of a vector, which was a bit clumsy.
+*) 28 jul 2006: Cleaned the code and added new error checks.
+    Corrected terminology "deflate" into "inflate".
+*) 23 jun 2006: Added SDL example in the documentation in the header, this
+    example allows easy debugging by displaying the PNG and its transparency.
+*) 22 jun 2006: (!) Changed way to obtain error value. Added
+    loadFile function for convenience. Made decodePNG32 faster.
+*) 21 jun 2006: (!) Changed type of info vector to unsigned.
+    Changed position of palette in info vector. Fixed an important bug that
+    happened on PNGs with an uncompressed block.
+*) 16 jun 2006: Internally changed unsigned into unsigned where
+    needed, and performed some optimizations.
+*) 07 jun 2006: (!) Renamed functions to decodePNG and placed them
+    in LodePNG namespace. Changed the order of the parameters. Rewrote the
+    documentation in the header. Renamed files to lodepng.cpp and lodepng.h
+*) 22 apr 2006: Optimized and improved some code
+*) 07 sep 2005: (!) Changed to std::vector interface
+*) 12 aug 2005: Initial release (C++, decoder only)
+
+
+12. contact information
+-----------------------
+
+Feel free to contact me with suggestions, problems, comments, ... concerning
+LodePNG. If you encounter a PNG image that doesn't work properly with this
+decoder, feel free to send it and I'll use it to find and fix the problem.
+
+My email address is (puzzle the account and domain together with an @ symbol):
+Domain: gmail dot com.
+Account: lode dot vandevenne.
+
+
+Copyright (c) 2005-2011 Lode Vandevenne
+*/
+
+#endif
+