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Fix invalid token parsing.

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Signed-off-by: yzrh <yzrh@noema.org>
This commit is contained in:
yzrh 2023-01-05 11:21:54 +00:00
parent a7ecc15614
commit 13cb0a1b8d
1 changed files with 24 additions and 21 deletions
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45
src/pdf_parser.c
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@ -228,28 +228,31 @@ pdf_load(pdf_object_t **pdf, FILE **fp, int size_buf)
((tail = _memmem_whitespace(buf, ptr->size, ">>", 2)) != NULL ||
/* Hack needed for invalid object */
(tail = memmem(buf, ptr->size, ">>", 2)) != NULL)) {
/*
* A dictionary object may have nested dictionary,
* but it should not be in a stream
*/
while (ptr->size - (tail - buf) > 3 &&
(tmp = _memmem_whitespace(tail + 3,
ptr->size - (tail - buf) - 3,
">>", 2)) != NULL &&
memmem(tail + 3,
(tmp - tail) - 3,
"stream\r\n", 8) == NULL)
tail = tmp;
if (memmem(buf, tail - buf, "stream\r\n", 8) != NULL) {
tail = memmem(buf, ptr->size, ">>", 2);
/* Hack needed for invalid object */
while (ptr->size - (tail - buf) > 2 &&
(tmp = memmem(tail + 2,
ptr->size - (tail - buf) - 2,
">>", 2)) != NULL &&
memmem(tail + 2,
(tmp - tail) - 2,
"stream\r\n", 8) == NULL)
tail = tmp;
while (ptr->size - (tail - buf) > 2 &&
(tmp = memmem(tail + 2,
ptr->size - (tail - buf) - 2,
">>", 2)) != NULL &&
memmem(tail + 2,
(tmp - tail) - 2,
"stream\r\n", 8) == NULL)
tail = tmp;
} else {
/*
* A dictionary object may have nested dictionary,
* but it should not be in a stream
*/
while (ptr->size - (tail - buf) > 3 &&
(tmp = _memmem_whitespace(tail + 3,
ptr->size - (tail - buf) - 3,
">>", 2)) != NULL &&
memmem(tail + 3,
(tmp - tail) - 3,
"stream\r\n", 8) == NULL)
tail = tmp;
}
ptr->dictionary_size = tail - head + 2;
ptr->dictionary = malloc(ptr->dictionary_size + 1);