diff options
| -rw-r--r-- | src/libnsgif.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/src/libnsgif.c b/src/libnsgif.c index f241145..8422563 100644 --- a/src/libnsgif.c +++ b/src/libnsgif.c @@ -177,6 +177,7 @@ static int gif_next_code(gif_animation *gif, int code_size) static gif_result gif_clear_codes_LZW(gif_animation *gif) { int i; + int code; if (lzw->clear_code >= (1 << GIF_MAX_LZW)) { lzw->stack_pointer = lzw->stack; @@ -197,8 +198,13 @@ static gif_result gif_clear_codes_LZW(gif_animation *gif) /* process repeated clear codes */ do { - lzw->firstcode = lzw->oldcode = gif_next_code(gif, lzw->code_size); - } while (lzw->firstcode == lzw->clear_code); + code = gif_next_code(gif, lzw->code_size); + if (code < 0) { + return code; + } + } while (code == lzw->clear_code); + lzw->firstcode = lzw->oldcode = code; + *lzw->stack_pointer++ = lzw->firstcode; return GIF_OK; @@ -219,6 +225,9 @@ static bool gif_next_LZW(gif_animation *gif) if (code == lzw->clear_code) { gif->current_error = gif_clear_codes_LZW(gif); + if (gif->current_error != GIF_OK) { + return false; + } return true; } @@ -1053,6 +1062,9 @@ gif_internal_decode_frame(gif_animation *gif, lzw->get_done = false; lzw->direct = lzw->buf; gif->current_error = gif_clear_codes_LZW(gif); + if (gif->current_error != GIF_OK) { + return gif->current_error; + } /* Decompress the data */ for (y = 0; y < height; y++) { |