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Save work on resolving PDF loading issues with random PDFs using different encryption methods and line endings.

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This commit is contained in:
Michael R Sweet
2021-11-01 21:30:46 -04:00
parent 6432187dea
commit 2f0d622873
5 changed files with 103 additions and 20 deletions
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7
pdfio-file.c
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@ -1414,6 +1414,7 @@ load_xref(
offset; // Offset in file
int generation; // Generation number
_pdfio_token_t tb; // Token buffer/stack
off_t line_offset; // Offset to start of line
while (!done)
@ -1426,6 +1427,8 @@ load_xref(
do
{
line_offset = _pdfioFileTell(pdf);
if (!_pdfioFileGets(pdf, line, sizeof(line)))
{
_pdfioFileError(pdf, "Unable to read start of xref table.");
@ -1434,7 +1437,7 @@ load_xref(
}
while (!line[0]);
PDFIO_DEBUG("load_xref: xref_offset=%lu, line='%s'\n", (unsigned long)xref_offset, line);
PDFIO_DEBUG("load_xref: line_offset=%lu, line='%s'\n", (unsigned long)line_offset, line);
if (isdigit(line[0] & 255) && strlen(line) > 4 && (!strcmp(line + strlen(line) - 4, " obj") || ((ptr = strstr(line, " obj")) != NULL && ptr[4] == '<')))
{
@ -1477,7 +1480,7 @@ load_xref(
return (false);
}
if (_pdfioFileSeek(pdf, xref_offset + ptr + 3 - line, SEEK_SET) < 0)
if (_pdfioFileSeek(pdf, line_offset + ptr + 3 - line, SEEK_SET) < 0)
{
_pdfioFileError(pdf, "Unable to seek to xref object %lu %u.", (unsigned long)number, (unsigned)generation);
return (false);