diff options
| -rw-r--r-- | miscutils/fbsplash.c | 72 |
1 files changed, 35 insertions, 37 deletions
diff --git a/miscutils/fbsplash.c b/miscutils/fbsplash.c index 3bf16ab..5974006 100644 --- a/miscutils/fbsplash.c +++ b/miscutils/fbsplash.c @@ -84,7 +84,7 @@ static void fb_open(const char *strfb_device) // map the device in memory G.addr = mmap(NULL, G.scr_var.xres * G.scr_var.yres - * BYTES_PER_PIXEL /*(G.scr_var.bits_per_pixel / 8)*/ , + * BYTES_PER_PIXEL /*(G.scr_var.bits_per_pixel / 8)*/, PROT_WRITE, MAP_SHARED, fbfd, 0); if (G.addr == MAP_FAILED) bb_perror_msg_and_die("mmap"); @@ -121,7 +121,7 @@ static void fb_drawrectangle(void) // vertical lines ptr1 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx) * BYTES_PER_PIXEL); ptr2 = (DATA*)(G.addr + (G.nbar_posy * G.scr_var.xres + G.nbar_posx + G.nbar_width - 1) * BYTES_PER_PIXEL); - cnt = G.nbar_height - 1 /* HUH?! G.nbar_posy + G.nbar_height - 1 - G.nbar_posy*/; + cnt = G.nbar_height - 1; do { *ptr1 = thispix; ptr1 += G.scr_var.xres; *ptr2 = thispix; ptr2 += G.scr_var.xres; @@ -216,70 +216,69 @@ static void fb_drawprogressbar(unsigned percent) */ static void fb_drawimage(void) { - char *head, *ptr; FILE *theme_file; + char *read_ptr; unsigned char *pixline; unsigned i, j, width, height, line_size; - if (LONE_DASH(G.image_filename)) + if (LONE_DASH(G.image_filename)) { theme_file = stdin; - else { + } else { int fd = open_zipped(G.image_filename); if (fd < 0) bb_simple_perror_msg_and_die(G.image_filename); theme_file = xfdopen_for_read(fd); } - head = xmalloc(256); - /* parse ppm header - * - A ppm image’s magic number is the two characters "P6". + /* Parse ppm header: + * - Magic: two characters "P6". * - Whitespace (blanks, TABs, CRs, LFs). * - A width, formatted as ASCII characters in decimal. * - Whitespace. - * - A height, again in ASCII decimal. + * - A height, ASCII decimal. * - Whitespace. - * - The maximum color value (Maxval), again in ASCII decimal. Must be - * less than 65536. + * - The maximum color value, ASCII decimal, in 0..65535 * - Newline or other single whitespace character. + * (we support newline only) * - A raster of Width * Height pixels in triplets of rgb - * in pure binary by 1 (or not implemented 2) bytes. + * in pure binary by 1 or 2 bytes. (we support only 1 byte) */ +#define concat_buf bb_common_bufsiz1 + read_ptr = concat_buf; while (1) { - if (fgets(head, 256, theme_file) == NULL - /* do not overrun the buffer */ - || strlen(bb_common_bufsiz1) >= sizeof(bb_common_bufsiz1) - 256) + int w, h, max_color_val; + int rem = concat_buf + sizeof(concat_buf) - read_ptr; + if (rem < 2 + || fgets(read_ptr, rem, theme_file) == NULL + ) { bb_error_msg_and_die("bad PPM file '%s'", G.image_filename); - - ptr = memchr(skip_whitespace(head), '#', 256); - if (ptr != NULL) - *ptr = 0; /* ignore comments */ - strcat(bb_common_bufsiz1, head); - // width, height, max_color_val - if (sscanf(bb_common_bufsiz1, "P6 %u %u %u", &width, &height, &i) == 3 - && i <= 255) + } + read_ptr = strchrnul(read_ptr, '#'); + *read_ptr = '\0'; /* ignore #comments */ + if (sscanf(concat_buf, "P6 %u %u %u", &w, &h, &max_color_val) == 3 + && max_color_val <= 255 + ) { + width = w; /* w is on stack, width may be in register */ + height = h; break; - /* If we do not find a signature throughout the whole file then - we will diagnose this via EOF on read in the head of the loop. */ + } } - if (ENABLE_FEATURE_CLEAN_UP) - free(head); - if (width != G.scr_var.xres || height != G.scr_var.yres) - bb_error_msg_and_die("PPM %dx%d does not match screen %dx%d", - width, height, G.scr_var.xres, G.scr_var.yres); line_size = width*3; + pixline = xmalloc(line_size); + if (width > G.scr_var.xres) width = G.scr_var.xres; if (height > G.scr_var.yres) height = G.scr_var.yres; - - pixline = xmalloc(line_size); for (j = 0; j < height; j++) { - unsigned char *pixel = pixline; - DATA *src = (DATA *)(G.addr + j * G.scr_fix.line_length); + unsigned char *pixel; + DATA *src; if (fread(pixline, 1, line_size, theme_file) != line_size) bb_error_msg_and_die("bad PPM file '%s'", G.image_filename); + pixel = pixline; + src = (DATA *)(G.addr + j * G.scr_fix.line_length); for (i = 0; i < width; i++) { unsigned thispix; thispix = (((unsigned)pixel[0] << 8) & 0xf800) @@ -289,8 +288,7 @@ static void fb_drawimage(void) pixel += 3; } } - if (ENABLE_FEATURE_CLEAN_UP) - free(pixline); + free(pixline); fclose(theme_file); } @@ -312,7 +310,7 @@ static void init(const char *cfg_filename) char *token[2]; parser_t *parser = config_open2(cfg_filename, xfopen_stdin); while (config_read(parser, token, 2, 2, "#=", - (PARSE_NORMAL | PARSE_MIN_DIE) & ~(PARSE_TRIM | PARSE_COLLAPSE))) { + (PARSE_NORMAL | PARSE_MIN_DIE) & ~(PARSE_TRIM | PARSE_COLLAPSE))) { unsigned val = xatoi_u(token[1]); int i = index_in_strings(param_names, token[0]); if (i < 0) |