16 static int verbose = 0;
17 static char *outname = "out";
19 static const char *progname;
20 #define errmsg(fmt, ...) (\
21 fprintf(stderr, "%s: " fmt, progname, __VA_ARGS__)\
30 int parserange(struct lbx_imginfo *info, char *str, unsigned char *bits)
32 unsigned long start, end;
36 start = strtoul(str, &endptr, 0);
37 if (start >= info->nframes) {
38 errmsg("frame %lu out of range.\n", start);
43 errmsg("invalid frame range: %s.\n", str);
52 end = strtoul(endptr+1, &endptr, 0);
53 if (end >= info->nframes) {
54 errmsg("frame %lu out of range.\n", end);
59 end = info->nframes - 1;
62 errmsg("invalid frame range: %s.\n", str);
67 errmsg("invalid frame range: %s.\n", str);
71 for (i = start; i <= end; i++) {
72 bits[i / CHAR_BIT] |= 1 << (i % CHAR_BIT);
78 int outpng(unsigned int frameno, unsigned char **framedata,
79 unsigned int width, unsigned int height,
80 struct lbx_colour palette[static 256])
82 char name[strlen(outname) + sizeof ".65535.png"];
88 assert(frameno < 65536);
89 snprintf(name, sizeof name, "%s.%03d.png", outname, frameno);
91 of = fopen(name, "wb");
93 errmsg("failed to open %s: %s.\n", name, strerror(errno));
97 png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
99 errmsg("failed to init libpng.\n", 0);
103 info = png_create_info_struct(png);
105 errmsg("failed to init libpng.\n", 0);
106 png_destroy_write_struct(&png, NULL);
110 if (setjmp(png_jmpbuf(png))) {
111 png_destroy_write_struct(&png, &info);
115 png_set_IHDR(png, info, width, height, 8, PNG_COLOR_TYPE_PALETTE,
116 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
117 PNG_FILTER_TYPE_DEFAULT);
118 png_set_PLTE(png, info, (png_colorp)palette, 256);
119 png_set_rows(png, info, framedata);
121 png_init_io(png, of);
122 png_write_png(png, info, PNG_TRANSFORM_IDENTITY, NULL);
124 png_destroy_write_struct(&png, &info);
128 printf("wrote %s\n", name);
137 int decode(LBX_IMG *img, FILE *palf, char **argv)
139 unsigned char *framebits;
140 struct lbx_colour palette[256];
141 struct lbx_imginfo info;
145 lbximg_getinfo(img, &info);
147 framebits = malloc(info.nframes / CHAR_BIT + 1);
152 /* Figure out what images we're extracting. */
154 /* extract all images by default. */
155 memset(framebits, -1, info.nframes / CHAR_BIT + 1);
157 for (i = 0; argv[i]; i++) {
158 parserange(&info, argv[i], framebits);
162 /* Read image palette */
164 if (lbximg_loadpalette(palf, palette) == -1) {
165 errmsg("error reading palette: %s\n", lbx_strerror());
169 fprintf(stderr, "warning: no palette specified; "
170 "decoded images will likely be very pink.\n");
172 for (i = 0; i < 256; i++)
173 palette[i] = (struct lbx_colour){0xff, 0x00, 0xff};
176 if (lbximg_getpalette(img, palette) == -1) {
177 errmsg("error reading palette override: %s\n", lbx_strerror());
181 /* Extract the images, in order. */
182 for (i = 0; i < info.nframes; i++) {
183 unsigned char **framedata;
185 if (!(framebits[i / CHAR_BIT] & (1 << (i % CHAR_BIT))))
188 framedata = lbximg_getframe(img, i);
190 errmsg("error in frame %u: %s\n", i, lbx_strerror());
194 if (!outpng(i, framedata, info.width, info.height, palette)) {
200 errmsg("no frames extracted.\n", 0);
211 int main(int argc, char **argv)
213 int mode = MODE_NONE;
214 FILE *inf = stdin, *palf = NULL;
215 const char *name = "stdin";
219 static const char *sopts = "idvf:p:";
220 static const struct option lopts[] = {
221 { "info", 0, NULL, 'i' },
222 { "decode", 0, NULL, 'd' },
223 { "verbose", 0, NULL, 'v' },
224 { "file", 1, NULL, 'f' },
225 { "palette", 1, NULL, 'p' },
230 progname = "lbximg"; /* argv[0]; */
231 while ((opt = getopt_long(argc, argv, sopts, lopts, NULL)) != -1) {
243 if (strcmp(optarg, "-") == 0)
246 name = strrchr(optarg, '/');
247 name = name ? name+1 : optarg;
249 inf = fopen(optarg, "rb");
251 errmsg("failed to open %s: %m\n", optarg);
256 palf = fopen(optarg, "rb");
258 errmsg("failed to open %s: %m\n", optarg);
268 if (mode == MODE_NONE) {
269 errmsg("you must specify a mode.\n", 0);
273 img = lbximg_fopen(inf);
275 errmsg("failed to open image: %s.\n", lbx_strerror());
279 if (verbose || mode == MODE_IDENT) {
280 struct lbx_imginfo info;
281 lbximg_getinfo(img, &info);
283 printf("%s is %ux%u LBX image, %u frames\n",
284 name, info.width, info.height, info.nframes);
289 if (decode(img, palf, &argv[optind])) {