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- document ppm header and skip whitespace

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This commit is contained in:
Bernhard Reutner-Fischer 2009-02-18 15:13:05 +00:00
parent e455f6ec27
commit 8dcb33c3eb
1 changed files with 14 additions and 2 deletions
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16
miscutils/fbsplash.c
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@ -224,14 +224,26 @@ static void fb_drawimage(void)
theme_file = xfopen_stdin(G.image_filename);
head = xmalloc(256);
// parse ppm header
/* parse ppm header
* - A ppm image’s magic number is the two characters "P6".
* - Whitespace (blanks, TABs, CRs, LFs).
* - A width, formatted as ASCII characters in decimal.
* - Whitespace.
* - A height, again in ASCII decimal.
* - Whitespace.
* - The maximum color value (Maxval), again in ASCII decimal. Must be
* less than 65536.
* - Newline or other single whitespace character.
* - A raster of Width * Height pixels in triplets of rgb
* in pure binary by 1 (or not implemented 2) bytes.
*/
while (1) {
if (fgets(head, 256, theme_file) == NULL
/* do not overrun the buffer */
|| strlen(bb_common_bufsiz1) >= sizeof(bb_common_bufsiz1) - 256)
bb_error_msg_and_die("bad PPM file '%s'", G.image_filename);
ptr = memchr(head, '#', 256);
ptr = memchr(skip_whitespace(head), '#', 256);
if (ptr != NULL)
*ptr = 0; /* ignore comments */
strcat(bb_common_bufsiz1, head);