diff options
Diffstat (limited to 'ff2pam.c')
| -rw-r--r-- | ff2pam.c | 66 |
1 files changed, 29 insertions, 37 deletions
@@ -5,38 +5,39 @@ #include <inttypes.h> #include <stdint.h> #include <stdio.h> +#include <stdlib.h> #include <string.h> #include <unistd.h> -static char *argv0; +#include "util.h" + +static void +usage(void) +{ + fprintf(stderr, "usage: %s\n", argv0); + exit(1); +} int main(int argc, char *argv[]) { - uint32_t hdr[4], width, height; - char buf[BUFSIZ]; - size_t n, t; + size_t rowlen; + uint32_t width, height, i; + uint16_t *row; + /* arguments */ argv0 = argv[0], argc--, argv++; if (argc) { - fprintf(stderr, "usage: %s\n", argv0); - return 1; + usage(); } - /* header */ - if (fread(hdr, sizeof(*hdr), 4, stdin) != 4) { - fprintf(stderr, "%s: file too short\n", argv0); - return 1; - } - if (memcmp("farbfeld", hdr, sizeof("farbfeld") - 1)) { - fprintf(stderr, "%s: invalid magic value\n", argv0); - return 1; - } - width = ntohl(hdr[2]); - height = ntohl(hdr[3]); + /* prepare */ + ff_read_header(&width, &height); + row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(uint16_t)); + rowlen = width * (sizeof("RGBA") - 1); - /* write header */ + /* write data */ printf("P7\n" "WIDTH %" PRIu32 "\n" "HEIGHT %" PRIu32 "\n" @@ -46,29 +47,20 @@ main(int argc, char *argv[]) "ENDHDR\n", width, height); - /* write image */ - t = (size_t)width * (size_t)height * sizeof(uint16_t) * (sizeof("RGBA") - 1); - for (; (n = fread(buf, 1, sizeof(buf) <= t ? sizeof(buf) : t, stdin)); ) { - t -= n; - fwrite(buf, 1, n, stdout); - - if (feof(stdin)) { - break; - } - if (ferror(stdin)) { - fprintf(stderr, "%s: read: %s\n", argv0, strerror(errno)); + for (i = 0; i < height; i++) { + if (fread(row, sizeof(uint16_t), rowlen, stdin) != rowlen) { + if (ferror(stdin)) { + fprintf(stderr, "%s: fread: %s\n", argv0, strerror(errno)); + } else { + fprintf(stderr, "%s: unexpected end of file\n", argv0); + } return 1; } - if (ferror(stdout)) { - fprintf(stderr, "%s: write: %s\n", argv0, strerror(errno)); + if (fwrite(row, sizeof(uint16_t), rowlen, stdout) != rowlen) { + fprintf(stderr, "%s: fwrite: %s\n", argv0, strerror(errno)); return 1; } } - if (t > 0) { - fprintf(stderr, "%s: file too short\n", argv0); - return 1; - } - - return 0; + return fshut(stdout, "<stdout>"); } |