| 4271 | } |
| 4272 | |
| 4273 | static int stbi__zexpand(stbi__zbuf *z, char *zout, int n) // need to make room for n bytes |
| 4274 | { |
| 4275 | char *q; |
| 4276 | unsigned int cur, limit, old_limit; |
| 4277 | z->zout = zout; |
| 4278 | if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG"); |
| 4279 | cur = (unsigned int) (z->zout - z->zout_start); |
| 4280 | limit = old_limit = (unsigned) (z->zout_end - z->zout_start); |
| 4281 | if (UINT_MAX - cur < (unsigned) n) return stbi__err("outofmem", "Out of memory"); |
| 4282 | while (cur + n > limit) { |
| 4283 | if(limit > UINT_MAX / 2) return stbi__err("outofmem", "Out of memory"); |
| 4284 | limit *= 2; |
| 4285 | } |
| 4286 | q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit); |
| 4287 | STBI_NOTUSED(old_limit); |
| 4288 | if (q == NULL) return stbi__err("outofmem", "Out of memory"); |
| 4289 | z->zout_start = q; |
| 4290 | z->zout = q + cur; |
| 4291 | z->zout_end = q + limit; |
| 4292 | return 1; |
| 4293 | } |
| 4294 | |
| 4295 | static const int stbi__zlength_base[31] = { |
| 4296 | 3,4,5,6,7,8,9,10,11,13, |
no test coverage detected