mirror of
https://github.com/ivabus/pantry
synced 2024-09-20 00:30:48 +03:00
125 lines
2.7 KiB
C
125 lines
2.7 KiB
C
#include <spng.h>
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#include <inttypes.h>
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#include <stdio.h>
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int main(int argc, char **argv)
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{
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int r = 0;
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FILE *png;
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char *pngbuf = NULL;
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spng_ctx *ctx = NULL;
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unsigned char *out = NULL;
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if(argc < 2)
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{
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printf("no input file\n");
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goto err;
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}
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png = fopen(argv[1], "rb");
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if(png == NULL)
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{
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printf("error opening input file %s\n", argv[1]);
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goto err;
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}
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fseek(png, 0, SEEK_END);
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long siz_pngbuf = ftell(png);
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rewind(png);
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if(siz_pngbuf < 1) goto err;
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pngbuf = malloc(siz_pngbuf);
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if(pngbuf == NULL)
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{
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printf("malloc() failed\n");
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goto err;
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}
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if(fread(pngbuf, siz_pngbuf, 1, png) != 1)
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{
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printf("fread() failed\n");
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goto err;
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}
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ctx = spng_ctx_new(0);
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if(ctx == NULL)
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{
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printf("spng_ctx_new() failed\n");
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goto err;
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}
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r = spng_set_crc_action(ctx, SPNG_CRC_USE, SPNG_CRC_USE);
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if(r)
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{
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printf("spng_set_crc_action() error: %s\n", spng_strerror(r));
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goto err;
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}
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r = spng_set_png_buffer(ctx, pngbuf, siz_pngbuf);
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if(r)
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{
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printf("spng_set_png_buffer() error: %s\n", spng_strerror(r));
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goto err;
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}
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struct spng_ihdr ihdr;
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r = spng_get_ihdr(ctx, &ihdr);
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if(r)
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{
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printf("spng_get_ihdr() error: %s\n", spng_strerror(r));
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goto err;
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}
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char *clr_type_str;
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if(ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE)
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clr_type_str = "grayscale";
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else if(ihdr.color_type == SPNG_COLOR_TYPE_TRUECOLOR)
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clr_type_str = "truecolor";
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else if(ihdr.color_type == SPNG_COLOR_TYPE_INDEXED)
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clr_type_str = "indexed color";
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else if(ihdr.color_type == SPNG_COLOR_TYPE_GRAYSCALE_ALPHA)
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clr_type_str = "grayscale with alpha";
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else
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clr_type_str = "truecolor with alpha";
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printf("width: %" PRIu32 "\nheight: %" PRIu32 "\n"
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"bit depth: %" PRIu8 "\ncolor type: %" PRIu8 " - %s\n",
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ihdr.width, ihdr.height,
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ihdr.bit_depth, ihdr.color_type, clr_type_str);
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printf("compression method: %" PRIu8 "\nfilter method: %" PRIu8 "\n"
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"interlace method: %" PRIu8 "\n",
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ihdr.compression_method, ihdr.filter_method,
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ihdr.interlace_method);
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size_t out_size;
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r = spng_decoded_image_size(ctx, SPNG_FMT_RGBA8, &out_size);
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if(r) goto err;
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out = malloc(out_size);
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if(out == NULL) goto err;
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r = spng_decode_image(ctx, out, out_size, SPNG_FMT_RGBA8, 0);
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if(r)
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{
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printf("spng_decode_image() error: %s\n", spng_strerror(r));
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goto err;
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}
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err:
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spng_ctx_free(ctx);
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free(out);
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free(pngbuf);
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return r;
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}
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