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Use named constant for regexp bytecode size field #183

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merged 1 commit into from
Dec 7, 2023
Merged

Use named constant for regexp bytecode size field #183

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14 changes: 8 additions & 6 deletions libregexp.c
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Original file line number Diff line number Diff line change
@@ -103,6 +103,7 @@ static const REOpCode reopcode_info[REOP_COUNT] = {
#define RE_HEADER_FLAGS 0
#define RE_HEADER_CAPTURE_COUNT 1
#define RE_HEADER_STACK_SIZE 2
#define RE_HEADER_BYTECODE_LEN 3

#define RE_HEADER_LEN 7

@@ -280,7 +281,7 @@ static __maybe_unused void lre_dump_bytecode(const uint8_t *buf,
assert(buf_len >= RE_HEADER_LEN);

re_flags= buf[0];
bc_len = get_u32(buf + 3);
bc_len = get_u32(buf + RE_HEADER_BYTECODE_LEN);
assert(bc_len + RE_HEADER_LEN <= buf_len);
printf("flags: 0x%x capture_count=%d stack_size=%d\n",
re_flags, buf[1], buf[2]);
@@ -1896,7 +1897,8 @@ uint8_t *lre_compile(int *plen, char *error_msg, int error_msg_size,

s->byte_code.buf[RE_HEADER_CAPTURE_COUNT] = s->capture_count;
s->byte_code.buf[RE_HEADER_STACK_SIZE] = stack_size;
put_u32(s->byte_code.buf + 3, s->byte_code.size - RE_HEADER_LEN);
put_u32(s->byte_code.buf + RE_HEADER_BYTECODE_LEN,
s->byte_code.size - RE_HEADER_LEN);

/* add the named groups if needed */
if (s->group_names.size > (s->capture_count - 1)) {
@@ -2554,8 +2556,8 @@ const char *lre_get_groupnames(const uint8_t *bc_buf)
uint32_t re_bytecode_len;
if ((lre_get_flags(bc_buf) & LRE_FLAG_NAMED_GROUPS) == 0)
return NULL;
re_bytecode_len = get_u32(bc_buf + 3);
return (const char *)(bc_buf + 7 + re_bytecode_len);
re_bytecode_len = get_u32(bc_buf + RE_HEADER_BYTECODE_LEN);
return (const char *)(bc_buf + RE_HEADER_LEN + re_bytecode_len);
}

void lre_byte_swap(uint8_t *buf, size_t len, BOOL is_byte_swapped)
@@ -2573,8 +2575,8 @@ void lre_byte_swap(uint8_t *buf, size_t len, BOOL is_byte_swapped)
// <capture group name 1>
// <capture group name 2>
// etc.
n = get_u32(&p[3]); // bytecode size
inplace_bswap32(&p[3]);
n = get_u32(&p[RE_HEADER_BYTECODE_LEN]);
inplace_bswap32(&p[RE_HEADER_BYTECODE_LEN]);
if (is_byte_swapped)
n = bswap32(n);
if (n > len - RE_HEADER_LEN)