void PNGAPI png_set_PLTE(png_structrp png_ptr, png_inforp info_ptr, png_const_colorp palette, int num_palette) { png_debug1(1, "in %s storage function", "PLTE"); if (png_ptr == NULL || info_ptr == NULL) return; if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) { if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) png_error(png_ptr, "Invalid palette length"); else { png_warning(png_ptr, "Invalid palette length"); return; } } if ((num_palette > 0 && palette == NULL) || (num_palette == 0 # ifdef PNG_MNG_FEATURES_SUPPORTED && (png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) == 0 # endif )) { png_error(png_ptr, "Invalid palette"); } /* It may not actually be necessary to set png_ptr->palette here; * we do it for backward compatibility with the way the png_handle_tRNS * function used to do the allocation. * * 1.6.0: the above statement appears to be incorrect; something has to set * the palette inside png_struct on read. */ png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead * of num_palette entries, in case of an invalid PNG file that has * too-large sample values. */ png_ptr->palette = png_voidcast(png_colorp, png_calloc(png_ptr, PNG_MAX_PALETTE_LENGTH * (sizeof (png_color)))); if (num_palette > 0) memcpy(png_ptr->palette, palette, num_palette * (sizeof (png_color))); info_ptr->palette = png_ptr->palette; info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; info_ptr->free_me |= PNG_FREE_PLTE; info_ptr->valid |= PNG_INFO_PLTE; }
void PNGAPI png_set_PLTE(png_structp png_ptr, png_infop info_ptr, png_const_colorp palette, int num_palette) { png_debug1(1, "in %s storage function", "PLTE"); if (png_ptr == NULL || info_ptr == NULL) return; if (num_palette < 0 || num_palette > PNG_MAX_PALETTE_LENGTH) { if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) png_error(png_ptr, "Invalid palette length"); else { png_warning(png_ptr, "Invalid palette length"); return; } } /* It may not actually be necessary to set png_ptr->palette here; * we do it for backward compatibility with the way the png_handle_tRNS * function used to do the allocation. */ png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0); /* Changed in libpng-1.2.1 to allocate PNG_MAX_PALETTE_LENGTH instead * of num_palette entries, in case of an invalid PNG file that has * too-large sample values. */ png_ptr->palette = (png_colorp)png_calloc(png_ptr, PNG_MAX_PALETTE_LENGTH * png_sizeof(png_color)); png_memcpy(png_ptr->palette, palette, num_palette * png_sizeof(png_color)); info_ptr->palette = png_ptr->palette; info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette; info_ptr->free_me |= PNG_FREE_PLTE; info_ptr->valid |= PNG_INFO_PLTE; }