diff options
| -rw-r--r-- | src/main.c | 2 | ||||
| -rw-r--r-- | src/netpbm.c | 105 |
2 files changed, 107 insertions, 0 deletions
@@ -26,10 +26,12 @@ extern struct imageformat libjpeg; extern struct imageformat giflib; extern struct imageformat libpng; extern struct imageformat bmp; +extern struct imageformat netpbm; struct imageformat *formats[] = { &libjpeg, &bmp, &libpng, + &netpbm, &giflib, /* HACK! make gif last (uses read()) */ NULL }; diff --git a/src/netpbm.c b/src/netpbm.c new file mode 100644 index 0000000..e6f6851 --- /dev/null +++ b/src/netpbm.c @@ -0,0 +1,105 @@ + +#include <stdio.h> +#include <stdlib.h> + +#include "meh.h" + +struct netpbm_t{ + struct image img; + FILE *f; + char format; + unsigned int maxval; +}; + +void skipspace(FILE *f){ + int c; + for(;;){ + c = fgetc(f); + while(isspace(c)) + c = fgetc(f); + if(c == '#') + while(fgetc(f) != '\n'); + else + break; + } + ungetc(c, f); +} + +struct image *netpbm_open(FILE *f){ + struct netpbm_t *b; + rewind(f); + + char format; + if(fgetc(f) != 'P') + return NULL; + format = fgetc(f); + if(format > '6' || format < '1') + return NULL; + + b = malloc(sizeof(struct netpbm_t)); + b->format = format; + + skipspace(f); + fscanf(f, "%u", &b->img.bufwidth); + skipspace(f); + fscanf(f, "%u", &b->img.bufheight); + if(format == '1' || format == '4'){ + b->maxval = 1; + }else{ + skipspace(f); + fscanf(f, "%u", &b->maxval); + } + + /* whitespace character */ + fgetc(f); + + b->f = f; + + return (struct image *)b; +} + +int netpbm_read(struct image *img){ + struct netpbm_t *b = (struct netpbm_t *)img; + FILE *f = b->f; + int a = 0; + + int left = img->bufwidth * img->bufheight; + int j, c; + + if(b->format == '4'){ + while(left){ + c = fgetc(f); + for(j = 0; j < 8 && left; j++){ + int val = (c & 1) ? 0 : 255; + img->buf[a++] = val; + img->buf[a++] = val; + img->buf[a++] = val; + c >>= 1; + left--; + } + } + }else if(b->format == '6'){ + while(left){ + img->buf[a++] = fgetc(f); + img->buf[a++] = fgetc(f); + img->buf[a++] = fgetc(f); + left--; + } + } + + img->state = LOADED; + return 0; +} + +void netpbm_close(struct image *img){ + struct netpbm_t *b = (struct netpbm_t *)img; + fclose(b->f); +} + +struct imageformat netpbm = { + netpbm_open, + NULL, + netpbm_read, + netpbm_close +}; + |