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lzw: Restrict pointers through code reader.

This commit is contained in:
Michael Drake 2021-04-17 17:28:32 +01:00 committed by Michael Drake
parent 71eb67ba7c
commit 98e8673dbc
1 changed files with 4 additions and 4 deletions
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8
libvips/foreign/libnsgif/lzw.c
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@ -36,7 +36,7 @@
* Note that an individual LZW code can be split over up to three sub-blocks.
*/
struct lzw_read_ctx {
const uint8_t *data; /**< Pointer to start of input data */
const uint8_t *restrict data; /**< Pointer to start of input data */
uint32_t data_len; /**< Input data length */
uint32_t data_sb_next; /**< Offset to sub-block size */
@ -122,7 +122,7 @@ void lzw_context_destroy(struct lzw_ctx *ctx)
* \param[in] ctx LZW reading context, updated on success.
* \return LZW_OK or LZW_OK_EOD on success, appropriate error otherwise.
*/
static lzw_result lzw__block_advance(struct lzw_read_ctx *ctx)
static lzw_result lzw__block_advance(struct lzw_read_ctx *restrict ctx)
{
uint32_t block_size;
uint32_t next_block_pos = ctx->data_sb_next;
@ -164,9 +164,9 @@ static lzw_result lzw__block_advance(struct lzw_read_ctx *ctx)
* \return LZW_OK or LZW_OK_EOD on success, appropriate error otherwise.
*/
static inline lzw_result lzw__read_code(
struct lzw_read_ctx *ctx,
struct lzw_read_ctx *restrict ctx,
uint8_t code_size,
uint32_t *code_out)
uint32_t *restrict code_out)
{
uint32_t code = 0;
uint8_t current_bit = ctx->sb_bit & 0x7;