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lzw: Avoid code size increment check when dictionary is full.

This commit is contained in:
Michael Drake 2021-03-31 20:18:43 +01:00 committed by Michael Drake
parent 1714cf6c3a
commit eb07e204e7
1 changed files with 3 additions and 4 deletions
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7
libvips/foreign/libnsgif/lzw.c
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@ -357,11 +357,10 @@ lzw_result lzw_decode(struct lzw_ctx *ctx,
lzw__dictionary_add_entry(ctx, (code_new < current_entry) ?
table[code_new].first_value :
ctx->previous_code_first);
}
/* Ensure code size is increased, if needed. */
if (current_entry == ctx->current_code_size_max) {
if (ctx->current_code_size < LZW_CODE_MAX) {
/* Ensure code size is increased, if needed. */
if (current_entry == ctx->current_code_size_max &&
ctx->current_code_size < LZW_CODE_MAX) {
ctx->current_code_size++;
ctx->current_code_size_max =
(1 << ctx->current_code_size) - 1;