diff options
author | Paride Legovini <pl@ninthfloor.org> | 2017-07-16 17:36:46 +0200 |
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committer | Paride Legovini <pl@ninthfloor.org> | 2017-07-16 17:36:46 +0200 |
commit | 31cb65d7cc6d257bcc725ef39ffbced7b465f0cc (patch) | |
tree | 28d325b462a84b8a16bd2e9aa546df75dcd1b664 /ff2png.c | |
parent | ed0e5905eff7383b05b87ecf1689a6938f9d79d3 (diff) | |
parent | 00dd0ab39f634729ec5d99b8057b9cef6fa0f23e (diff) |
Merge tag '3'
Diffstat (limited to 'ff2png.c')
-rw-r--r-- | ff2png.c | 102 |
1 files changed, 49 insertions, 53 deletions
@@ -9,83 +9,79 @@ #include <png.h> -static char *argv0; +#include "util.h" -void -pngerr(png_structp pngs, const char *msg) +static void +png_err(png_struct *pngs, const char *msg) { + (void)pngs; fprintf(stderr, "%s: libpng: %s\n", argv0, msg); exit(1); } +static void +png_setup_writer(png_struct **s, png_info **i, uint32_t w, uint32_t h) +{ + *s = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, png_err, NULL); + *i = png_create_info_struct(*s); + + if (!*s || !*i) { + fprintf(stderr, "%s: failed to initialize libpng\n", argv0); + exit(1); + } + + png_init_io(*s, stdout); + png_set_IHDR(*s, *i, w, h, 16, PNG_COLOR_TYPE_RGB_ALPHA, + PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, + PNG_FILTER_TYPE_BASE); + png_write_info(*s, *i); +} + +static void +usage(void) +{ + fprintf(stderr, "usage: %s\n", argv0); + exit(1); +} + int main(int argc, char *argv[]) { - png_structp pngs; - png_infop pngi; + png_struct *pngs; + png_info *pngi; size_t rowlen; - uint32_t hdr[4], width, height, i; + uint32_t width, height, i; uint16_t *row; + /* arguments */ argv0 = argv[0], argc--, argv++; if (argc) { - fprintf(stderr, "usage: %s\n", argv0); - return 1; - } - - /* header */ - if (fread(hdr, sizeof(*hdr), 4, stdin) != 4) { - goto readerr; - } - if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) { - fprintf(stderr, "%s: invalid magic value\n", argv0); - return 1; + usage(); } - width = ntohl(hdr[2]); - height = ntohl(hdr[3]); - - /* load png */ - pngs = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, pngerr, - NULL); - pngi = png_create_info_struct(pngs); - - if (!pngs || !pngi) { - fprintf(stderr, "%s: failed to initialize libpng\n", argv0); - return 1; - } - png_init_io(pngs, stdout); - png_set_IHDR(pngs, pngi, width, height, 16, PNG_COLOR_TYPE_RGB_ALPHA, - PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, - PNG_FILTER_TYPE_BASE); - png_write_info(pngs, pngi); - /* write rows */ - if (width > SIZE_MAX / ((sizeof("RGBA") - 1) * sizeof(uint16_t))) { - fprintf(stderr, "%s: row length integer overflow\n", argv0); - return 1; - } + /* prepare */ + ff_read_header(&width, &height); + png_setup_writer(&pngs, &pngi, width, height); + row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(uint16_t)); rowlen = width * (sizeof("RGBA") - 1); - if (!(row = malloc(rowlen * sizeof(uint16_t)))) { - fprintf(stderr, "%s: malloc: out of memory\n", argv0); - return 1; - } + + /* write data */ for (i = 0; i < height; ++i) { if (fread(row, sizeof(uint16_t), rowlen, stdin) != rowlen) { - goto readerr; + if (ferror(stdin)) { + fprintf(stderr, "%s: fread: %s\n", argv0, strerror(errno)); + } else { + fprintf(stderr, "%s: unexpected end of file\n", argv0); + } + return 1; } png_write_row(pngs, (uint8_t *)row); } + + /* clean up */ png_write_end(pngs, NULL); png_destroy_write_struct(&pngs, NULL); - return 0; -readerr: - if (ferror(stdin)) { - fprintf(stderr, "%s: fread: %s\n", argv0, strerror(errno)); - } else { - fprintf(stderr, "%s: unexpected end of file\n", argv0); - } - - return 1; + return fshut(stdout, "<stdout>"); } |