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Diffstat (limited to 'Build/source/libs/libpng/libpng-src/contrib/examples/iccfrompng.c')
| -rw-r--r-- | Build/source/libs/libpng/libpng-src/contrib/examples/iccfrompng.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/Build/source/libs/libpng/libpng-src/contrib/examples/iccfrompng.c b/Build/source/libs/libpng/libpng-src/contrib/examples/iccfrompng.c new file mode 100644 index 00000000000..603037e7097 --- /dev/null +++ b/Build/source/libs/libpng/libpng-src/contrib/examples/iccfrompng.c @@ -0,0 +1,185 @@ +/*- iccfrompng + * + * COPYRIGHT: Written by John Cunningham Bowler, 2011. + * To the extent possible under law, the author has waived all copyright and + * related or neighboring rights to this work. This work is published from: + * United States. + * + * Extract any icc profiles found in the given PNG files. This is a simple + * example of a program that extracts information from the header of a PNG file + * without processing the image. Notice that some header information may occur + * after the image data. Textual data and comments are an example; the approach + * in this file won't work reliably for such data because it only looks for the + * information in the section of the file that preceeds the image data. + * + * Compile and link against libpng and zlib, plus anything else required on the + * system you use. + * + * To use supply a list of PNG files containing iCCP chunks, the chunks will be + * extracted to a similarly named file with the extension replaced by 'icc', + * which will be overwritten without warning. + */ +#include <stdlib.h> +#include <setjmp.h> +#include <string.h> +#include <stdio.h> + +#include <png.h> + +#if defined(PNG_READ_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) && \ + defined (PNG_iCCP_SUPPORTED) + + +static int verbose = 1; +static png_byte no_profile[] = "no profile"; + +static png_bytep +extract(FILE *fp, png_uint_32 *proflen) +{ + png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,0,0,0); + png_infop info_ptr = NULL; + png_bytep result = NULL; + + /* Initialize for error or no profile: */ + *proflen = 0; + + if (png_ptr == NULL) + { + fprintf(stderr, "iccfrompng: version library mismatch?\n"); + return 0; + } + + if (setjmp(png_jmpbuf(png_ptr))) + { + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + return 0; + } + + png_init_io(png_ptr, fp); + + info_ptr = png_create_info_struct(png_ptr); + if (info_ptr == NULL) + png_error(png_ptr, "OOM allocating info structure"); + + png_read_info(png_ptr, info_ptr); + + { + png_charp name; + int compression_type; + png_bytep profile; + + if (png_get_iCCP(png_ptr, info_ptr, &name, &compression_type, &profile, + proflen) & PNG_INFO_iCCP) + { + result = malloc(*proflen); + if (result != NULL) + memcpy(result, profile, *proflen); + + else + png_error(png_ptr, "OOM allocating profile buffer"); + } + + else + result = no_profile; + } + + png_destroy_read_struct(&png_ptr, &info_ptr, NULL); + return result; +} + +static int +extract_one_file(const char *filename) +{ + int result = 0; + FILE *fp = fopen(filename, "rb"); + + if (fp != NULL) + { + png_uint_32 proflen = 0; + png_bytep profile = extract(fp, &proflen); + + if (profile != NULL && profile != no_profile) + { + size_t len; + char *output; + + { + const char *ep = strrchr(filename, '.'); + + if (ep != NULL) + len = ep-filename; + + else + len = strlen(filename); + } + + output = malloc(len + 5); + if (output != NULL) + { + FILE *of; + + memcpy(output, filename, len); + strcpy(output+len, ".icc"); + + of = fopen(output, "wb"); + if (of != NULL) + { + if (fwrite(profile, proflen, 1, of) == 1 && + fflush(of) == 0 && + fclose(of) == 0) + { + if (verbose) + printf("%s -> %s\n", filename, output); + /* Success return */ + result = 1; + } + + else + { + fprintf(stderr, "%s: error writing profile\n", output); + if (remove(output)) + fprintf(stderr, "%s: could not remove file\n", output); + } + } + + else + fprintf(stderr, "%s: failed to open output file\n", output); + + free(output); + } + + else + fprintf(stderr, "%s: OOM allocating string!\n", filename); + + free(profile); + } + + else if (verbose && profile == no_profile) + printf("%s has no profile\n", filename); + } + + else + fprintf(stderr, "%s: could not open file\n", filename); + + return result; +} + +int +main(int argc, char **argv) +{ + int i; + int extracted = 0; + + for (i=1; i<argc; ++i) + { + if (strcmp(argv[i], "-q") == 0) + verbose = 0; + + else if (extract_one_file(argv[i])) + extracted = 1; + } + + /* Exit code is true if any extract succeeds */ + return extracted == 0; +} +#endif /* READ && STDIO && iCCP */ |