Initial library state

.travis.yml

@@ -1,4 +1,5 @@
 language: c
+
 dist: trusty
 sudo: required
 
@@ -6,6 +7,10 @@ compiler:
   - gcc
   - clang
 
+before_install:
+  - sudo apt-get install libtool autoconf git nasm
+  - ./install.sh
+
 before_script:
   - mkdir build
   - cd build

CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 2.8.12)
 project(libcaesium)
 
+set(CMAKE_MACOSX_RPATH 1)
+
 #set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 
 #set(SOURCE_FILES demo/main.cpp)

README.md

@@ -1,2 +1,3 @@
 # libcaesium
+[![Build Status](https://travis-ci.org/Lymphatus/libcaesium.svg?branch=master)](https://travis-ci.org/Lymphatus/libcaesium)  
 The Caesium compression library written in C

caesium/CMakeLists.txt

@@ -1,5 +1,15 @@
-add_library(caesium caesium.c error.c utils.c)
+find_library(zoflipng zopflipng /usr/local/lib)
+find_library(jpeg jpeg /opt/mozjpeg/lib)
+find_library(turbojpeg turbojpeg /opt/mozjpeg/lib)
 
+add_library(caesium SHARED caesium.c error.c utils.c png.c lodepng.c jpeg.c)
+add_library(caesium_static STATIC caesium.c error.c utils.c png.c lodepng.c jpeg.c)
+
+set_target_properties(caesium_static PROPERTIES OUTPUT_NAME caesium)
+
+target_link_libraries(caesium zopflipng)
+target_link_libraries(caesium jpeg)
+target_link_libraries(caesium turbojpeg)
 # Make sure the compiler can find include files for our Caesium library
 # when other libraries or executables link to Caesium
 target_include_directories(caesium PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})

caesium/caesium.c

@@ -5,16 +5,18 @@
 #include "error.h"
 #include "utils.h"
 #include "caesium.h"
+#include "png.h"
+#include "jpeg.h"
 
-bool cs_compress(const char *input, const char *output, cs_image_pars *options)
+bool cs_compress(const char *inputPath, const char *outputPath, cs_image_pars *options)
 {
 	FILE *pInputFile;
-	enum image_type type;
+	image_type type;
 	bool result = false;
 
 	//Inline... Should I split into 2 lines?
-	if ((pInputFile = fopen(input, "rb")) == NULL) {
+	if ((pInputFile = fopen(inputPath, "rb")) == NULL) {
-		display_error(0, 4);
+		display_error(ERROR, 4);
 		return result;
 	}
 
@@ -23,13 +25,18 @@ bool cs_compress(const char *input, const char *output, cs_image_pars *options)
 	fclose(pInputFile);
 
 	if (type == UNKN) {
-		display_error(1, 3);
+		display_error(WARNING, 3);
 	} else if (type == JPEG) {
 		//TODO result Compress JPEG
-		printf("Called JPEG compression\n");
+		if (options->jpeg.quality != 0) {
+			printf("Called JPEG lossy compression\n");
+			cs_jpeg_compress(outputPath, cs_jpeg_decompress(inputPath, &options->jpeg), &options->jpeg);
+		}
+		printf("Called JPEG lossless compression\n");
+		cs_jpeg_optimize(inputPath, outputPath, options->jpeg.exif_copy, inputPath);
 	} else if (type == PNG) {
-		//TODO result Compress PNG
 		printf("Called PNG compression\n");
+		result = cs_png_optimize(inputPath, outputPath, &options->png);
 	}
 
 	return result;

caesium/caesium.h

@@ -1,5 +1,5 @@
-#ifndef CAESIUM_H
+#ifndef LIBCAESIUM_CAESIUM_H
-#define CAESIUM_H
+#define LIBCAESIUM_CAESIUM_H
 
 #include <stdbool.h>
 

caesium/cstypes.h

@@ -1,7 +1,8 @@
-#ifndef CS_CCLTYPES
+#ifndef LIBCAESIUM_CSTYPES_H
-#define CS_CCLTYPES
+#define LIBCAESIUM_CSTYPES_H
 
 #include <stdbool.h>
+#include <turbojpeg.h>
 
 typedef struct cs_jpeg_pars
 {
@@ -9,8 +10,9 @@ typedef struct cs_jpeg_pars
 	int color_space;
 	int dct_method;
 	bool exif_copy;
-	bool lossless;
+	enum TJSAMP subsample;
-	//TODO uncomment when linking turbojpeg enum TJSAMP subsample;
+	int width;
+	int height;
 } cs_jpeg_pars;
 
 typedef struct cs_png_pars
@@ -27,17 +29,19 @@ typedef struct cs_image_pars
 {
 	cs_jpeg_pars jpeg;
 	cs_png_pars png;
-
-	int width;
-	int height;
-	char **filepath;
 } cs_image_pars;
 
-enum image_type
+typedef enum image_type
 {
 	JPEG,
 	PNG,
 	UNKN,
-};
+} image_type;
+
+typedef enum error_level
+{
+	ERROR = 0,
+	WARNING = 1
+} error_level;
 
 #endif

caesium/error.c

@@ -2,7 +2,7 @@
 
 #include "error.h"
 
-void display_error(int level, int code)
+void display_error(error_level level, int code)
 {
 	char *error_level = ((level) ? "WARNING" : "ERROR");
 	fprintf(stderr, "%s %d: %s\n",
@@ -14,6 +14,7 @@ void display_error(int level, int code)
 const char *get_error_message(int code)
 {
 	switch (code) {
+		//Generic errors
 		case 1:
 			return "NULL file pointer while checking type.";
 		case 2:
@@ -22,6 +23,15 @@ const char *get_error_message(int code)
 			return "File type not supported.";
 		case 4:
 			return "Could not open input file.";
+
+			//PNG related errors
+		case 200:
+			return "Failed to load PNG file.";
+		case 201:
+			return "Error while optimizing PNG.";
+		case 203:
+			return "Error while writing output PNG file.";
+
 		default:
 			return "Unrecognized error.";
 	}

caesium/error.h

@@ -1,7 +1,9 @@
-#ifndef CS_ERROR
+#ifndef LIBCAESIUM_ERROR_H
-#define CS_ERROR
+#define LIBCAESIUM_ERROR_H
 
-void display_error(int level, int code);
+#include "cstypes.h"
+
+void display_error(error_level level, int code);
 
 const char *get_error_message(int code);
 

caesium/jpeg.c

@@ -0,0 +1,266 @@
+#include <stdio.h>
+#include <jpeglib.h>
+#include <string.h>
+#include <turbojpeg.h>
+
+#include "jpeg.h"
+
+//TODO Error handling
+
+struct jpeg_decompress_struct cs_get_markers(const char *input)
+{
+	FILE *fp;
+	struct jpeg_decompress_struct einfo;
+	struct jpeg_error_mgr eerr;
+	einfo.err = jpeg_std_error(&eerr);
+
+	jpeg_create_decompress(&einfo);
+
+	//Open the input file
+	fp = fopen(input, "r");
+
+	//Check for errors
+	//TODO Use UNIX error messages
+	if (fp == NULL) {
+		//trigger_error(13, true, input);
+	}
+
+	//Create the IO instance for the input file
+	jpeg_stdio_src(&einfo, fp);
+
+	//Save EXIF info
+	for (int m = 0; m < 16; m++) {
+		jpeg_save_markers(&einfo, JPEG_APP0 + m, 0xFFFF);
+	}
+
+	jpeg_read_header(&einfo, TRUE);
+
+	fclose(fp);
+
+	return einfo;
+}
+
+int cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif, const char *exif_src)
+{
+	//TODO Bug on normal compress: the input file is a bogus long string
+	// Happened with a (bugged) server connection
+	//File pointer for both input and output
+	FILE *fp;
+
+	//Those will hold the input/output structs
+	struct jpeg_decompress_struct srcinfo;
+	struct jpeg_compress_struct dstinfo;
+
+	//Error handling
+	struct jpeg_error_mgr jsrcerr, jdsterr;
+
+	//Input/Output array coefficents
+	jvirt_barray_ptr *src_coef_arrays;
+	jvirt_barray_ptr *dst_coef_arrays;
+
+	//Set errors and create the compress/decompress istances
+	srcinfo.err = jpeg_std_error(&jsrcerr);
+	jpeg_create_decompress(&srcinfo);
+	dstinfo.err = jpeg_std_error(&jdsterr);
+	jpeg_create_compress(&dstinfo);
+
+
+	//Open the input file
+	fp = fopen(input_file, "r");
+
+	//Check for errors
+	//TODO Use UNIX error messages
+	if (fp == NULL) {
+		//trigger_error(105, true, input_file);
+	}
+
+	//Create the IO istance for the input file
+	jpeg_stdio_src(&srcinfo, fp);
+
+	//Save EXIF info
+	if (exif) {
+		for (int m = 0; m < 16; m++) {
+			jpeg_save_markers(&srcinfo, JPEG_APP0 + m, 0xFFFF);
+		}
+	}
+
+	//Read the input headers
+	(void) jpeg_read_header(&srcinfo, TRUE);
+
+
+	//Read input coefficents
+	src_coef_arrays = jpeg_read_coefficients(&srcinfo);
+	//jcopy_markers_setup(&srcinfo, copyoption);
+
+	//Copy parameters
+	jpeg_copy_critical_parameters(&srcinfo, &dstinfo);
+
+	//Set coefficents array to be the same
+	dst_coef_arrays = src_coef_arrays;
+
+	//We don't need the input file anymore
+	fclose(fp);
+
+	//Open the output one instead
+	fp = fopen(output_file, "w+");
+	//Check for errors
+	//TODO Use UNIX error messages
+	if (fp == NULL) {
+		//trigger_error(106, true, output_file);
+	}
+
+	//CRITICAL - This is the optimization step
+	dstinfo.optimize_coding = TRUE;
+	//Progressive
+	jpeg_simple_progression(&dstinfo);
+
+	//Set the output file parameters
+	jpeg_stdio_dest(&dstinfo, fp);
+
+	//Actually write the coefficents
+	jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
+
+	//Write EXIF
+	if (exif) {
+		if (strcmp(input_file, exif_src) == 0) {
+			jcopy_markers_execute(&srcinfo, &dstinfo);
+		} else {
+			//For standard compression EXIF data
+			struct jpeg_decompress_struct einfo = cs_get_markers(exif_src);
+			jcopy_markers_execute(&einfo, &dstinfo);
+			jpeg_destroy_decompress(&einfo);
+		}
+	}
+
+	//Finish and free
+	jpeg_finish_compress(&dstinfo);
+	jpeg_destroy_compress(&dstinfo);
+	(void) jpeg_finish_decompress(&srcinfo);
+	jpeg_destroy_decompress(&srcinfo);
+
+	//Close the output file
+	fclose(fp);
+
+	return 0;
+}
+
+void cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_jpeg_pars *options)
+{
+	FILE *fp;
+	tjhandle tjCompressHandle;
+	unsigned char *output_buffer;
+	unsigned long output_size = 0;
+
+	fp = fopen(output_file, "wb");
+
+	//Check for errors
+	//TODO Use UNIX error messages
+	if (fp == NULL) {
+		//trigger_error(106, true, output_file);
+	}
+
+	output_buffer = NULL;
+	tjCompressHandle = tjInitCompress();
+
+	//TODO Error checks
+	tjCompress2(tjCompressHandle,
+				image_buffer,
+				options->width,
+				0,
+				options->height,
+				options->color_space,
+				&output_buffer,
+				&output_size,
+				options->subsample,
+				options->quality,
+				options->dct_method);
+
+	fwrite(output_buffer, output_size, 1, fp);
+
+	fclose(fp);
+	tjDestroy(tjCompressHandle);
+	tjFree(output_buffer);
+
+}
+
+unsigned char *cs_jpeg_decompress(const char *fileName, cs_jpeg_pars *options)
+{
+
+	//TODO I/O Error handling
+
+	FILE *file = NULL;
+	int res = 0;
+	long int sourceJpegBufferSize = 0;
+	unsigned char *sourceJpegBuffer = NULL;
+	tjhandle tjDecompressHandle;
+	int fileWidth = 0, fileHeight = 0, jpegSubsamp = 0, colorSpace = 0;
+
+	//TODO No error checks here
+	file = fopen(fileName, "rb");
+	res = fseek(file, 0, SEEK_END);
+	sourceJpegBufferSize = ftell(file);
+	sourceJpegBuffer = tjAlloc(sourceJpegBufferSize);
+
+	res = fseek(file, 0, SEEK_SET);
+	res = fread(sourceJpegBuffer, (long) sourceJpegBufferSize, 1, file);
+	tjDecompressHandle = tjInitDecompress();
+	res = tjDecompressHeader3(tjDecompressHandle, sourceJpegBuffer, sourceJpegBufferSize, &fileWidth, &fileHeight,
+							  &jpegSubsamp, &colorSpace);
+
+	options->width = fileWidth;
+	options->height = fileHeight;
+
+	options->subsample = jpegSubsamp;
+	options->color_space = colorSpace;
+
+	unsigned char *temp = tjAlloc(options->width * options->height * tjPixelSize[options->color_space]);
+
+	res = tjDecompress2(tjDecompressHandle,
+						sourceJpegBuffer,
+						sourceJpegBufferSize,
+						temp,
+						options->width,
+						0,
+						options->height,
+						options->color_space,
+						options->dct_method);
+
+	//fwrite(temp, pars->width * pars->height * tjPixelSize[pars->color_space], 1, fopen("/Users/lymphatus/Desktop/tmp/compresse/ccc", "w"));
+
+	tjDestroy(tjDecompressHandle);
+
+	return temp;
+}
+
+void jcopy_markers_execute(j_decompress_ptr srcinfo, j_compress_ptr dstinfo)
+{
+	jpeg_saved_marker_ptr marker;
+
+	/* In the current implementation, we don't actually need to examine the
+	* option flag here; we just copy everything that got saved.
+	* But to avoid confusion, we do not output JFIF and Adobe APP14 markers
+	* if the encoder library already wrote one.
+	*/
+	for (marker = srcinfo->marker_list; marker != NULL; marker = marker->next) {
+		if (dstinfo->write_JFIF_header &&
+			marker->marker == JPEG_APP0 &&
+			marker->data_length >= 5 &&
+			GETJOCTET(marker->data[0]) == 0x4A &&
+			GETJOCTET(marker->data[1]) == 0x46 &&
+			GETJOCTET(marker->data[2]) == 0x49 &&
+			GETJOCTET(marker->data[3]) == 0x46 &&
+			GETJOCTET(marker->data[4]) == 0)
+			continue;                 /* reject duplicate JFIF */
+		if (dstinfo->write_Adobe_marker &&
+			marker->marker == JPEG_APP0 + 14 &&
+			marker->data_length >= 5 &&
+			GETJOCTET(marker->data[0]) == 0x41 &&
+			GETJOCTET(marker->data[1]) == 0x64 &&
+			GETJOCTET(marker->data[2]) == 0x6F &&
+			GETJOCTET(marker->data[3]) == 0x62 &&
+			GETJOCTET(marker->data[4]) == 0x65)
+			continue;                 /* reject duplicate Adobe */
+		jpeg_write_marker(dstinfo, marker->marker,
+						  marker->data, marker->data_length);
+	}
+}

caesium/jpeg.h

@@ -0,0 +1,18 @@
+#ifndef LIBCAESIUM_JPEG_H
+#define LIBCAESIUM_JPEG_H
+
+#include <jpeglib.h>
+
+#include "cstypes.h"
+
+int cs_jpeg_optimize(const char *input_file, const char *output_file, bool exif, const char *exif_src);
+
+struct jpeg_decompress_struct cs_get_markers(const char *input);
+
+void cs_jpeg_compress(const char *output_file, unsigned char *image_buffer, cs_jpeg_pars *options);
+
+unsigned char *cs_jpeg_decompress(const char *fileName, cs_jpeg_pars *options);
+
+void jcopy_markers_execute(j_decompress_ptr srcinfo, j_compress_ptr dstinfo);
+
+#endif //LIBCAESIUM_JPEG_H

caesium/lodepng.h

@@ -0,0 +1,939 @@
+/*
+LodePNG version 20131222
+
+Copyright (c) 2005-2013 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*/
+
+/*
+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.
+The "NO_COMPILE" defines are designed to be used to pass as defines to the
+compiler command to disable them without modifying this header, e.g.
+-DLODEPNG_NO_COMPILE_ZLIB for gcc.
+*/
+/*deflate & zlib. If disabled, you must specify alternative zlib functions in
+the custom_zlib field of the compress and decompress settings*/
+#ifndef LODEPNG_NO_COMPILE_ZLIB
+#define LODEPNG_COMPILE_ZLIB
+#endif
+/*png encoder and png decoder*/
+#ifndef LODEPNG_NO_COMPILE_PNG
+#define LODEPNG_COMPILE_PNG
+#endif
+/*deflate&zlib decoder and png decoder*/
+#ifndef LODEPNG_NO_COMPILE_DECODER
+#define LODEPNG_COMPILE_DECODER
+#endif
+/*deflate&zlib encoder and png encoder*/
+#ifndef LODEPNG_NO_COMPILE_ENCODER
+#define LODEPNG_COMPILE_ENCODER
+#endif
+/*the optional built in harddisk file loading and saving functions*/
+#ifndef LODEPNG_NO_COMPILE_DISK
+#define LODEPNG_COMPILE_DISK
+#endif
+/*support for chunks other than IHDR, IDAT, PLTE, tRNS, IEND: ancillary and unknown chunks*/
+#ifndef LODEPNG_NO_COMPILE_ANCILLARY_CHUNKS
+#define LODEPNG_COMPILE_ANCILLARY_CHUNKS
+#endif
+/*ability to convert error numerical codes to English text string*/
+#ifndef LODEPNG_NO_COMPILE_ERROR_TEXT
+#define LODEPNG_COMPILE_ERROR_TEXT
+#endif
+/*Compile the default allocators (C's free, malloc and realloc). If you disable this,
+you can define the functions lodepng_free, lodepng_malloc and lodepng_realloc in your
+source files with custom allocators.*/
+#ifndef LODEPNG_NO_COMPILE_ALLOCATORS
+#define LODEPNG_COMPILE_ALLOCATORS
+#endif
+/*compile the C++ version (you can disable the C++ wrapper here even when compiling for C++)*/
+#ifdef __cplusplus
+#ifndef LODEPNG_NO_COMPILE_CPP
+#define LODEPNG_COMPILE_CPP
+#endif
+#endif
+
+#ifdef LODEPNG_COMPILE_PNG
+/*The PNG color types (also used for raw).*/
+typedef enum LodePNGColorType
+{
+	LCT_GREY = 0, /*greyscale: 1,2,4,8,16 bit*/
+	LCT_RGB = 2, /*RGB: 8,16 bit*/
+	LCT_PALETTE = 3, /*palette: 1,2,4,8 bit*/
+	LCT_GREY_ALPHA = 4, /*greyscale with alpha: 8,16 bit*/
+	LCT_RGBA = 6 /*RGB with alpha: 8,16 bit*/
+} LodePNGColorType;
+
+#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.
+     After decoding, its size is w * h * (bytes per pixel) bytes larger than
+     initially. Bytes per pixel depends on colortype and bitdepth.
+     Must be freed after usage with free(*out).
+     Note: for 16-bit per channel colors, uses big endian format like PNG does.
+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_memory(unsigned char **out, unsigned *w, unsigned *h,
+							   const unsigned char *in, size_t insize,
+							   LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_decode_memory, but always decodes to 32-bit RGBA raw image*/
+unsigned lodepng_decode32(unsigned char **out, unsigned *w, unsigned *h,
+						  const unsigned char *in, size_t insize);
+
+/*Same as lodepng_decode_memory, but always decodes to 24-bit RGB raw image*/
+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.
+Same as the other decode functions, but instead takes a filename as input.
+*/
+unsigned lodepng_decode_file(unsigned char **out, unsigned *w, unsigned *h,
+							 const char *filename,
+							 LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_decode_file, but always decodes to 32-bit RGBA raw image.*/
+unsigned lodepng_decode32_file(unsigned char **out, unsigned *w, unsigned *h,
+							   const char *filename);
+
+/*Same as lodepng_decode_file, but always decodes to 24-bit RGB raw image.*/
+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.
+  Note: for 16-bit per channel colors, needs big endian format like PNG does.
+out: Output parameter. Pointer to buffer that will contain the PNG image 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_memory(unsigned char **out, size_t *outsize,
+							   const unsigned char *image, unsigned w, unsigned h,
+							   LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_encode_memory, but always encodes from 32-bit RGBA raw image.*/
+unsigned lodepng_encode32(unsigned char **out, size_t *outsize,
+						  const unsigned char *image, unsigned w, unsigned h);
+
+/*Same as lodepng_encode_memory, but always encodes from 24-bit RGB raw image.*/
+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 the other encode functions, but instead takes a filename as output.
+NOTE: This overwrites existing files without warning!
+*/
+unsigned lodepng_encode_file(const char *filename,
+							 const unsigned char *image, unsigned w, unsigned h,
+							 LodePNGColorType colortype, unsigned bitdepth);
+
+/*Same as lodepng_encode_file, but always encodes from 32-bit RGBA raw image.*/
+unsigned lodepng_encode32_file(const char *filename,
+							   const unsigned char *image, unsigned w, unsigned h);
+
+/*Same as lodepng_encode_file, but always encodes from 24-bit RGB raw image.*/
+unsigned lodepng_encode24_file(const char *filename,
+							   const unsigned char *image, unsigned w, unsigned h);
+
+#endif /*LODEPNG_COMPILE_DISK*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#ifdef LODEPNG_COMPILE_CPP
+namespace lodepng
+{
+#ifdef LODEPNG_COMPILE_DECODER
+/*Same as lodepng_decode_memory, but decodes to an std::vector.*/
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+				const unsigned char* in, size_t insize,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+				const std::vector<unsigned char>& in,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts PNG file from disk to raw pixel data in memory.
+Same as the other decode functions, but instead takes a filename as input.
+*/
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+				const std::string& filename,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_DECODER
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*Same as lodepng_encode_memory, but encodes to an std::vector.*/
+unsigned encode(std::vector<unsigned char>& out,
+				const unsigned char* in, unsigned w, unsigned h,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned encode(std::vector<unsigned char>& out,
+				const std::vector<unsigned char>& in, unsigned w, unsigned h,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#ifdef LODEPNG_COMPILE_DISK
+/*
+Converts 32-bit RGBA raw pixel data into a PNG file on disk.
+Same as the other encode functions, but instead takes a filename as output.
+NOTE: This overwrites existing files without warning!
+*/
+unsigned encode(const std::string& filename,
+				const unsigned char* in, unsigned w, unsigned h,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+unsigned encode(const std::string& filename,
+				const std::vector<unsigned char>& in, unsigned w, unsigned h,
+				LodePNGColorType colortype = LCT_RGBA, unsigned bitdepth = 8);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_ENCODER
+} //namespace lodepng
+#endif /*LODEPNG_COMPILE_CPP*/
+#endif /*LODEPNG_COMPILE_PNG*/
+
+#ifdef LODEPNG_COMPILE_ERROR_TEXT
+
+/*Returns an English description of the numerical error code.*/
+const char *lodepng_error_text(unsigned code);
+
+#endif /*LODEPNG_COMPILE_ERROR_TEXT*/
+
+#ifdef LODEPNG_COMPILE_DECODER
+/*Settings for zlib decompression*/
+typedef struct LodePNGDecompressSettings LodePNGDecompressSettings;
+
+struct LodePNGDecompressSettings
+{
+	unsigned ignore_adler32; /*if 1, continue and don't give an error message if the Adler32 checksum is corrupted*/
+
+	/*use custom zlib decoder instead of built in one (default: null)*/
+	unsigned (*custom_zlib)(unsigned char **, size_t *,
+							const unsigned char *, size_t,
+							const LodePNGDecompressSettings *);
+
+	/*use custom deflate decoder instead of built in one (default: null)
+	if custom_zlib is used, custom_deflate is ignored since only the built in
+	zlib function will call custom_deflate*/
+	unsigned (*custom_inflate)(unsigned char **, size_t *,
+							   const unsigned char *, size_t,
+							   const LodePNGDecompressSettings *);
+
+	const void *custom_context; /*optional custom settings for custom functions*/
+};
+
+extern const LodePNGDecompressSettings lodepng_default_decompress_settings;
+
+void lodepng_decompress_settings_init(LodePNGDecompressSettings *settings);
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*
+Settings for zlib compression. Tweaking these settings tweaks the balance
+between speed and compression ratio.
+*/
+typedef struct LodePNGCompressSettings LodePNGCompressSettings;
+
+struct LodePNGCompressSettings /*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 use_lz77; /*whether or not to use LZ77. Should be 1 for proper compression.*/
+	unsigned windowsize; /*must be a power of two <= 32768. higher compresses more but is slower. Typical value: 2048.*/
+	unsigned minmatch; /*mininum lz77 length. 3 is normally best, 6 can be better for some PNGs. Default: 0*/
+	unsigned nicematch; /*stop searching if >= this length found. Set to 258 for best compression. Default: 128*/
+	unsigned lazymatching; /*use lazy matching: better compression but a bit slower. Default: true*/
+
+	/*use custom zlib encoder instead of built in one (default: null)*/
+	unsigned (*custom_zlib)(unsigned char **, size_t *,
+							const unsigned char *, size_t,
+							const LodePNGCompressSettings *);
+
+	/*use custom deflate encoder instead of built in one (default: null)
+	if custom_zlib is used, custom_deflate is ignored since only the built in
+	zlib function will call custom_deflate*/
+	unsigned (*custom_deflate)(unsigned char **, size_t *,
+							   const unsigned char *, size_t,
+							   const LodePNGCompressSettings *);
+
+	const void *custom_context; /*optional custom settings for custom functions*/
+};
+
+extern const LodePNGCompressSettings lodepng_default_compress_settings;
+
+void lodepng_compress_settings_init(LodePNGCompressSettings *settings);
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+#ifdef LODEPNG_COMPILE_PNG
+/*
+Color mode of an image. Contains all information required to decode the pixel
+bits to RGBA colors. This information is the same as used in the PNG file
+format, and is used both for PNG and raw image data in LodePNG.
+*/
+typedef struct LodePNGColorMode
+{
+	/*header (IHDR)*/
+	LodePNGColorType 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)
+
+	Dynamically allocated with the colors of the palette, including alpha.
+	When encoding a PNG, to store your colors in the palette of the LodePNGColorMode, first use
+	lodepng_palette_clear, then for each color use lodepng_palette_add.
+	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.
+
+	The palette is only supported for color type 3.
+	*/
+	unsigned char *palette; /*palette in RGBARGBA... order. When allocated, must be either 0, or have size 1024*/
+	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.
+
+	The color key is only supported for color types 0 and 2.
+	*/
+	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*/
+} LodePNGColorMode;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_color_mode_init(LodePNGColorMode *info);
+
+void lodepng_color_mode_cleanup(LodePNGColorMode *info);
+
+/*return value is error code (0 means no error)*/
+unsigned lodepng_color_mode_copy(LodePNGColorMode *dest, const LodePNGColorMode *source);
+
+void lodepng_palette_clear(LodePNGColorMode *info);
+
+/*add 1 color to the palette*/
+unsigned lodepng_palette_add(LodePNGColorMode *info,
+							 unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+
+/*get the total amount of bits per pixel, based on colortype and bitdepth in the struct*/
+unsigned lodepng_get_bpp(const LodePNGColorMode *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_get_channels(const LodePNGColorMode *info);
+
+/*is it a greyscale type? (only colortype 0 or 4)*/
+unsigned lodepng_is_greyscale_type(const LodePNGColorMode *info);
+
+/*has it got an alpha channel? (only colortype 2 or 6)*/
+unsigned lodepng_is_alpha_type(const LodePNGColorMode *info);
+
+/*has it got a palette? (only colortype 3)*/
+unsigned lodepng_is_palette_type(const LodePNGColorMode *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_has_palette_alpha(const LodePNGColorMode *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_can_have_alpha(const LodePNGColorMode *info);
+
+/*Returns the byte size of a raw image buffer with given width, height and color mode*/
+size_t lodepng_get_raw_size(unsigned w, unsigned h, const LodePNGColorMode *color);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+/*The information of a Time chunk in PNG.*/
+typedef struct LodePNGTime
+{
+	unsigned year;    /*2 bytes used (0-65535)*/
+	unsigned month;   /*1-12*/
+	unsigned day;     /*1-31*/
+	unsigned hour;    /*0-23*/
+	unsigned minute;  /*0-59*/
+	unsigned second;  /*0-60 (to allow for leap seconds)*/
+} LodePNGTime;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+
+/*Information about the PNG image, except pixels, width and height.*/
+typedef struct LodePNGInfo
+{
+	/*header (IHDR), palette (PLTE) and transparency (tRNS) chunks*/
+	unsigned compression_method;/*compression method of the original file. Always 0.*/
+	unsigned filter_method;     /*filter method of the original file*/
+	unsigned interlace_method;  /*interlace method of the original file*/
+	LodePNGColorMode color;     /*color type and bits, palette and transparency of the PNG file*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+	/*
+	suggested background color chunk (bKGD)
+	This color uses the same color mode as the PNG (except alpha channel), 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)
+
+	The char** arrays each contain num strings. The actual messages are in
+	text_strings, while text_keys are keywords that give a short description what
+	the actual text represents, e.g. Title, Author, Description, or anything else.
+
+	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.
+
+	Don't allocate these text buffers yourself. Use the init/cleanup functions
+	correctly and use lodepng_add_text and lodepng_clear_text.
+	*/
+	size_t text_num; /*the amount of texts in these char** buffers (there may be more texts in itext)*/
+	char **text_keys; /*the keyword of a text chunk (e.g. "Comment")*/
+	char **text_strings; /*the actual text*/
+
+	/*
+	international text chunks (iTXt)
+	Similar to the non-international text chunks, but with additional strings
+	"langtags" and "transkeys".
+	*/
+	size_t itext_num; /*the amount of international texts in this PNG*/
+	char **itext_keys; /*the English keyword of the text chunk (e.g. "Comment")*/
+	char **itext_langtags; /*language tag for this text's language, ISO/IEC 646 string, e.g. ISO 639 language tag*/
+	char **itext_transkeys; /*keyword translated to the international language - UTF-8 string*/
+	char **itext_strings; /*the actual international text - UTF-8 string*/
+
+	/*time chunk (tIME)*/
+	unsigned time_defined; /*set to 1 to make the encoder generate a tIME chunk*/
+	LodePNGTime 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 phys_unit; /*may be 0 (unknown unit) or 1 (metre)*/
+
+	/*
+	unknown chunks
+	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_chunk_append, to read/write this struct.
+	*/
+	unsigned char *unknown_chunks_data[3];
+	size_t unknown_chunks_size[3]; /*size in bytes of the unknown chunks, given for protection*/
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGInfo;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_info_init(LodePNGInfo *info);
+
+void lodepng_info_cleanup(LodePNGInfo *info);
+
+/*return value is error code (0 means no error)*/
+unsigned lodepng_info_copy(LodePNGInfo *dest, const LodePNGInfo *source);
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+
+void lodepng_clear_text(LodePNGInfo *info); /*use this to clear the texts again after you filled them in*/
+unsigned lodepng_add_text(LodePNGInfo *info, const char *key, const char *str); /*push back both texts at once*/
+
+void lodepng_clear_itext(LodePNGInfo *info); /*use this to clear the itexts again after you filled them in*/
+unsigned lodepng_add_itext(LodePNGInfo *info, 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*/
+
+/*
+Converts raw buffer from one color type to another color type, based on
+LodePNGColorMode 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_get_bpp)
+The fix_png value works as described in struct LodePNGDecoderSettings.
+Note: for 16-bit per channel colors, uses big endian format like PNG does.
+*/
+unsigned lodepng_convert(unsigned char *out, const unsigned char *in,
+						 LodePNGColorMode *mode_out, const LodePNGColorMode *mode_in,
+						 unsigned w, unsigned h, unsigned fix_png);
+
+#ifdef LODEPNG_COMPILE_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 LodePNGDecoderSettings
+{
+	LodePNGDecompressSettings zlibsettings; /*in here is the setting to ignore Adler32 checksums*/
+
+	unsigned ignore_crc; /*ignore CRC checksums*/
+	/*
+	The fix_png setting, if 1, makes the decoder tolerant towards some PNG images
+	that do not correctly follow the PNG specification. This only supports errors
+	that are fixable, were found in images that are actually used on the web, and
+	are silently tolerated by other decoders as well. Currently only one such fix
+	is implemented: if a palette index is out of bounds given the palette size,
+	interpret it as opaque black.
+	By default this value is 0, which makes it stop with an error on such images.
+	*/
+	unsigned fix_png;
+	unsigned color_convert; /*whether to convert the PNG to the color type you want. Default: yes*/
+
+#ifdef LODEPNG_COMPILE_ANCILLARY_CHUNKS
+	unsigned read_text_chunks; /*if false but remember_unknown_chunks is true, they're stored in the unknown chunks*/
+	/*store all bytes from unknown chunks in the LodePNGInfo (off by default, useful for a png editor)*/
+	unsigned remember_unknown_chunks;
+#endif /*LODEPNG_COMPILE_ANCILLARY_CHUNKS*/
+} LodePNGDecoderSettings;
+
+void lodepng_decoder_settings_init(LodePNGDecoderSettings *settings);
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+/*automatically use color type with less bits per pixel if losslessly possible. Default: AUTO*/
+typedef enum LodePNGFilterStrategy
+{
+	/*every filter at zero*/
+			LFS_ZERO,
+	/*Use filter that gives minumum sum, as described in the official PNG filter heuristic.*/
+			LFS_MINSUM,
+	/*Use the filter type that gives smallest Shannon entropy for this scanline. Depending
+	on the image, this is better or worse than minsum.*/
+			LFS_ENTROPY,
+	/*
+	Brute-force-search PNG filters by compressing each filter for each scanline.
+	Experimental, very slow, and only rarely gives better compression than MINSUM.
+	*/
+			LFS_BRUTE_FORCE,
+	/*use predefined_filters buffer: you specify the filter type for each scanline*/
+			LFS_PREDEFINED
+} LodePNGFilterStrategy;
+
+/*automatically use color type with less bits per pixel if losslessly possible. Default: LAC_AUTO*/
+typedef enum LodePNGAutoConvert
+{
+	LAC_NO, /*use color type user requested*/
+	LAC_ALPHA, /*use color type user requested, but if only opaque pixels and RGBA or grey+alpha, use RGB or grey*/
+	LAC_AUTO, /*use PNG color type that can losslessly represent the uncompressed image the smallest possible*/
+	/*
+	like AUTO, but do not choose 1, 2 or 4 bit per pixel types.
+	sometimes a PNG image compresses worse if less than 8 bits per pixels.
+	*/
+			LAC_AUTO_NO_NIBBLES,
+	/*
+	like AUTO, but never choose palette color type. For small images, encoding
+	the palette may take more bytes than what is gained. Note that AUTO also
+	already prevents encoding the palette for extremely small images, but that may
+	not be sufficient because due to the compression it cannot predict when to
+	switch.
+	*/
+			LAC_AUTO_NO_PALETTE,
+	LAC_AUTO_NO_NIBBLES_NO_PALETTE
+} LodePNGAutoConvert;
+
+
+/*
+Automatically chooses color type that gives smallest amount of bits in the
+output image, e.g. grey if there are only greyscale pixels, palette if there
+are less than 256 colors, ...
+The auto_convert parameter allows limiting it to not use palette, ...
+*/
+unsigned lodepng_auto_choose_color(LodePNGColorMode *mode_out,
+								   const unsigned char *image, unsigned w, unsigned h,
+								   const LodePNGColorMode *mode_in,
+								   LodePNGAutoConvert auto_convert);
+
+/*Settings for the encoder.*/
+typedef struct LodePNGEncoderSettings
+{
+	LodePNGCompressSettings zlibsettings; /*settings for the zlib encoder, such as window size, ...*/
+
+	LodePNGAutoConvert auto_convert; /*how to automatically choose output PNG color type, if at all*/
+
+	/*If true, follows the official PNG heuristic: if the PNG uses a palette or lower than
+	8 bit depth, set all filters to zero. Otherwise use the filter_strategy. Note that to
+	completely follow the official PNG heuristic, filter_palette_zero must be true and
+	filter_strategy must be LFS_MINSUM*/
+	unsigned filter_palette_zero;
+	/*Which filter strategy to use when not using zeroes due to filter_palette_zero.
+	Set filter_palette_zero to 0 to ensure always using your chosen strategy. Default: LFS_MINSUM*/
+	LodePNGFilterStrategy filter_strategy;
+	/*used if filter_strategy is LFS_PREDEFINED. In that case, this must point to a buffer with
+	the same length as the amount of scanlines in the image, and each value must <= 5. You
+	have to cleanup this buffer, LodePNG will never free it. Don't forget that filter_palette_zero
+	must be set to 0 to ensure this is also used on palette or low bitdepth images.*/
+	const unsigned char *predefined_filters;
+
+	/*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 identifier and version as a text chunk, for debugging*/
+	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*/
+} LodePNGEncoderSettings;
+
+void lodepng_encoder_settings_init(LodePNGEncoderSettings *settings);
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+
+#if defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER)
+/*The settings, state and information for extended encoding and decoding.*/
+typedef struct LodePNGState
+{
+#ifdef LODEPNG_COMPILE_DECODER
+	LodePNGDecoderSettings decoder; /*the decoding settings*/
+#endif /*LODEPNG_COMPILE_DECODER*/
+#ifdef LODEPNG_COMPILE_ENCODER
+	LodePNGEncoderSettings encoder; /*the encoding settings*/
+#endif /*LODEPNG_COMPILE_ENCODER*/
+	LodePNGColorMode info_raw; /*specifies the format in which you would like to get the raw pixel buffer*/
+	LodePNGInfo info_png; /*info of the PNG image obtained after decoding*/
+	unsigned error;
+#ifdef LODEPNG_COMPILE_CPP
+	//For the lodepng::State subclass.
+  virtual ~LodePNGState(){}
+#endif
+} LodePNGState;
+
+/*init, cleanup and copy functions to use with this struct*/
+void lodepng_state_init(LodePNGState *state);
+
+void lodepng_state_cleanup(LodePNGState *state);
+
+void lodepng_state_copy(LodePNGState *dest, const LodePNGState *source);
+
+#endif /* defined(LODEPNG_COMPILE_DECODER) || defined(LODEPNG_COMPILE_ENCODER) */
+
+#ifdef LODEPNG_COMPILE_DECODER
+
+/*
+Same as lodepng_decode_memory, but uses a LodePNGState to allow custom settings and
+getting much more information about the PNG image and color mode.
+*/
+unsigned lodepng_decode(unsigned char **out, unsigned *w, unsigned *h,
+						LodePNGState *state,
+						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 info_png field of the LodePNGState.
+*/
+unsigned lodepng_inspect(unsigned *w, unsigned *h,
+						 LodePNGState *state,
+						 const unsigned char *in, size_t insize);
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/*This function allocates the out buffer with standard malloc and stores the size in *outsize.*/
+unsigned lodepng_encode(unsigned char **out, size_t *outsize,
+						const unsigned char *image, unsigned w, unsigned h,
+						LodePNGState *state);
+
+#endif /*LODEPNG_COMPILE_ENCODER*/
+
+/*
+The lodepng_chunk functions are normally not needed, except to traverse the
+unknown chunks stored in the LodePNGInfo struct, or add new ones to it.
+It also allows traversing the chunks of an encoded PNG file yourself.
+
+PNG standard chunk naming conventions:
+First byte: uppercase = critical, lowercase = ancillary
+Second byte: uppercase = public, lowercase = private
+Third byte: must be uppercase
+Fourth byte: uppercase = unsafe to copy, lowercase = safe to copy
+*/
+
+/*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);
+
+/*0: it's one of the critical chunk types, 1: it's an ancillary chunk (see PNG standard)*/
+unsigned char lodepng_chunk_ancillary(const unsigned char *chunk);
+
+/*0: public, 1: private (see PNG standard)*/
+unsigned char lodepng_chunk_private(const unsigned char *chunk);
+
+/*0: the chunk is unsafe to copy, 1: the chunk is safe to copy (see PNG standard)*/
+unsigned char lodepng_chunk_safetocopy(const unsigned char *chunk);
+
+/*get pointer to the data of the chunk, where the input points to the header of the chunk*/
+unsigned char *lodepng_chunk_data(unsigned char *chunk);
+
+const unsigned char *lodepng_chunk_data_const(const unsigned char *chunk);
+
+/*returns 0 if the crc is correct, 1 if it's incorrect (0 for OK as usual!)*/
+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_chunk_append(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_chunk_create(unsigned char **out, size_t *outlength, unsigned length,
+							  const char *type, const unsigned char *data);
+
+
+/*Calculate CRC32 of buffer*/
+unsigned lodepng_crc32(const unsigned char *buf, size_t len);
+
+#endif /*LODEPNG_COMPILE_PNG*/
+
+
+#ifdef LODEPNG_COMPILE_ZLIB
+/*
+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
+
+/*Inflate a buffer. Inflate is the decompression step of deflate. Out buffer must be freed after use.*/
+unsigned lodepng_inflate(unsigned char **out, size_t *outsize,
+						 const unsigned char *in, size_t insize,
+						 const LodePNGDecompressSettings *settings);
+
+/*
+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 LodePNGDecompressSettings *settings);
+
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+
+/*
+Compresses data with Zlib. Reallocates the out buffer and appends the data.
+Zlib adds a small header and trailer around the deflate 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 LodePNGCompressSettings *settings);
+
+/*
+Find length-limited Huffman code for given frequencies. This function is in the
+public interface only for tests, it's used internally by lodepng_deflate.
+*/
+unsigned lodepng_huffman_code_lengths(unsigned *lengths, const unsigned *frequencies,
+									  size_t numcodes, unsigned maxbitlen);
+
+/*Compress a buffer with deflate. See RFC 1951. Out buffer must be freed after use.*/
+unsigned lodepng_deflate(unsigned char **out, size_t *outsize,
+						 const unsigned char *in, size_t insize,
+						 const LodePNGCompressSettings *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 should free 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_load_file(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_save_file(const unsigned char *buffer, size_t buffersize, const char *filename);
+
+#endif /*LODEPNG_COMPILE_DISK*/
+
+#ifdef LODEPNG_COMPILE_CPP
+//The LodePNG C++ wrapper uses std::vectors instead of manually allocated memory buffers.
+namespace lodepng
+{
+#ifdef LODEPNG_COMPILE_PNG
+class State : public LodePNGState
+{
+  public:
+	State();
+	State(const State& other);
+	virtual ~State();
+	State& operator=(const State& other);
+};
+
+#ifdef LODEPNG_COMPILE_DECODER
+//Same as other lodepng::decode, but using a State for more settings and information.
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+				State& state,
+				const unsigned char* in, size_t insize);
+unsigned decode(std::vector<unsigned char>& out, unsigned& w, unsigned& h,
+				State& state,
+				const std::vector<unsigned char>& in);
+#endif /*LODEPNG_COMPILE_DECODER*/
+
+#ifdef LODEPNG_COMPILE_ENCODER
+//Same as other lodepng::encode, but using a State for more settings and information.
+unsigned encode(std::vector<unsigned char>& out,
+				const unsigned char* in, unsigned w, unsigned h,
+				State& state);
+unsigned encode(std::vector<unsigned char>& out,
+				const std::vector<unsigned char>& in, unsigned w, unsigned h,
+				State& state);
+#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 load_file(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 save_file(const std::vector<unsigned char>& buffer, const std::string& filename);
+#endif //LODEPNG_COMPILE_DISK
+#endif //LODEPNG_COMPILE_PNG
+
+#ifdef LODEPNG_COMPILE_ZLIB
+#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 LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
+
+//Zlib-decompress an std::vector
+unsigned decompress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+					const LodePNGDecompressSettings& settings = lodepng_default_decompress_settings);
+#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 LodePNGCompressSettings& settings = lodepng_default_compress_settings);
+
+//Zlib-compress an std::vector
+unsigned compress(std::vector<unsigned char>& out, const std::vector<unsigned char>& in,
+				  const LodePNGCompressSettings& settings = lodepng_default_compress_settings);
+#endif //LODEPNG_COMPILE_ENCODER
+#endif //LODEPNG_COMPILE_ZLIB
+} //namespace lodepng
+#endif /*LODEPNG_COMPILE_CPP*/
+
+#endif /*LODEPNG_H inclusion guard*/

caesium/png.c

@@ -0,0 +1,60 @@
+//
+// Created by Matteo Paonessa on 08/11/16.
+//
+
+#include <stdlib.h>
+#include <zopflipng/zopflipng_lib.h>
+
+#include "png.h"
+#include "lodepng.h"
+#include "error.h"
+
+bool cs_png_optimize(const char *input, const char *output, cs_png_pars *options)
+{
+	bool result = false;
+	CZopfliPNGOptions png_options;
+
+	CZopfliPNGSetDefaults(&png_options);
+
+	unsigned char *orig_buffer;
+	size_t orig_buffer_size;
+
+	unsigned char *resultpng = NULL;
+	size_t resultpng_size;
+
+	png_options.num_iterations = options->iterations;
+	png_options.num_iterations_large = options->iterations_large;
+	png_options.block_split_strategy = options->block_split_strategy;
+
+	png_options.lossy_8bit = options->lossy_8;
+	png_options.lossy_transparent = options->transparent;
+
+	png_options.auto_filter_strategy = options->auto_filter_strategy;
+
+	if (lodepng_load_file(&orig_buffer, &orig_buffer_size, input) != 0) {
+		display_error(ERROR, 200);
+		goto cleanup;
+	}
+
+	if (CZopfliPNGOptimize(orig_buffer,
+						   orig_buffer_size,
+						   &png_options,
+						   0,
+						   &resultpng,
+						   &resultpng_size) != 0) {
+		display_error(ERROR, 201);
+		goto cleanup;
+	}
+
+	if (lodepng_save_file(resultpng, resultpng_size, output) != 0) {
+		display_error(ERROR, 202);
+		goto cleanup;
+	}
+
+	result = true;
+
+	cleanup:
+	free(orig_buffer);
+	free(resultpng);
+	return result;
+}

caesium/png.h

@@ -0,0 +1,12 @@
+//
+// Created by Matteo Paonessa on 08/11/16.
+//
+
+#ifndef LIBCAESIUM_PNG_H
+#define LIBCAESIUM_PNG_H
+
+#include "cstypes.h"
+
+bool cs_png_optimize(const char *input, const char *output, cs_png_pars *options);
+
+#endif //LIBCAESIUM_PNG_H

caesium/utils.c

@@ -4,17 +4,17 @@
 #include "utils.h"
 #include "error.h"
 
-enum image_type detect_image_type(FILE *pFile)
+image_type detect_image_type(FILE *pFile)
 {
 	unsigned char buffer[2];
 
 	if (pFile == NULL) {
-		display_error(0, 1);
+		display_error(ERROR, 1);
 		return UNKN;
 	}
 
 	if (fread(buffer, 1, 2, pFile) < 2) {
-		display_error(0, 2);
+		display_error(ERROR, 2);
 		return UNKN;
 	}
 

caesium/utils.h

@@ -1,10 +1,10 @@
-#ifndef CCLT_UTILS
+#ifndef LIBCAESIUM_UTILS_H
-#define CCLT_UTILS
+#define LIBCAESIUM_UTILS_H
 
 #include <stdio.h>
 
 #include "cstypes.h"
 
-enum image_type detect_image_type(FILE *pFile);
+image_type detect_image_type(FILE *pFile);
 
 #endif

demo/CMakeLists.txt

@@ -1,3 +1,3 @@
-add_executable(caesiumd main.c)
+add_executable(caesiumd main.c helper.c)
 
 target_link_libraries(caesiumd LINK_PUBLIC caesium)

demo/helper.c

@@ -0,0 +1,32 @@
+#include <stdbool.h>
+
+#include "helper.h"
+
+void initialize_jpeg_parameters(cs_image_pars *options)
+{
+	options->jpeg.quality = 65;
+	options->jpeg.exif_copy = false;
+	options->jpeg.dct_method = TJFLAG_FASTDCT;
+	options->jpeg.width = 0;
+	options->jpeg.height = 0;
+}
+
+void initialize_png_parameters(cs_image_pars *par)
+{
+	par->png.iterations = 10;
+	par->png.iterations_large = 5;
+	par->png.block_split_strategy = 4;
+	par->png.lossy_8 = true;
+	par->png.transparent = true;
+	par->png.auto_filter_strategy = 1;
+}
+
+cs_image_pars initialize_parameters()
+{
+	cs_image_pars options;
+
+	initialize_jpeg_parameters(&options);
+	initialize_png_parameters(&options);
+
+	return options;
+}

demo/helper.h

@@ -0,0 +1,12 @@
+#ifndef LIBCAESIUM_HELPER_H
+#define LIBCAESIUM_HELPER_H
+
+#include "cstypes.h"
+
+void initialize_jpeg_parameters(cs_image_pars *options);
+
+void initialize_png_parameters(cs_image_pars *options);
+
+cs_image_pars initialize_parameters();
+
+#endif

demo/main.c

@@ -1,8 +1,9 @@
 #include "caesium.h"
+#include "helper.h"
 
 int main()
 {
-	cs_image_pars options;
+	cs_image_pars options = initialize_parameters();
-	cs_compress("test", "test1", &options);
+	cs_compress("test.jpg", "test1.jpg", &options);
 	return 0;
 }

install.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+#mozjpeg
+git clone https://github.com/mozilla/mozjpeg
+cd mozjpeg/
+autoreconf -fiv
+mkdir build && cd build
+../configure
+make && sudo make install
+
+#zopflipng
+git clone https://github.com/google/zopfli.git
+cd zopfli
+make libzopflipng
+sudo cp libzopflipng.so.1.0.0 /usr/lib
+sudo ln -s libzopflipng.so.1.0.0 /usr/lib/libzopflipng.so
+sudo ln -s libzopflipng.so.1.0.0 /usr/lib/libzopflipng.so.1
+sudo mkdir /usr/include/zopflipng
+sudo cp src/zopflipng/zopflipng_lib.h /usr/include/zopflipng