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Fix _pdfioFileSeek with whence==SEEK_CUR

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Fix seek offset after trailer.

Look at the last 1k of the file to find the startxref marker.
This commit is contained in:
Michael R Sweet
2023-12-12 12:24:49 -05:00
parent 038fd8686b
commit f4aa951165
2 changed files with 36 additions and 15 deletions
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8
pdfio-common.c
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@@ -141,7 +141,7 @@ _pdfioFileGets(pdfio_file_t *pdf, // I - PDF file
*bufend = buffer + bufsize - 1; // Pointer to end of buffer
PDFIO_DEBUG("_pdfioFileGets(pdf=%p, buffer=%p, bufsize=%lu) bufpos=%ld, buffer=%p, bufptr=%p, bufend=%p\n", pdf, buffer, (unsigned long)bufsize, (long)pdf->bufpos, pdf->buffer, pdf->bufptr, pdf->bufend);
PDFIO_DEBUG("_pdfioFileGets(pdf=%p, buffer=%p, bufsize=%lu) bufpos=%ld, buffer=%p, bufptr=%p, bufend=%p, offset=%lu\n", pdf, buffer, (unsigned long)bufsize, (long)pdf->bufpos, pdf->buffer, pdf->bufptr, pdf->bufend, (unsigned long)(pdf->bufpos + (pdf->bufptr - pdf->buffer)));
while (!eol)
{
@@ -356,12 +356,12 @@ _pdfioFileSeek(pdfio_file_t *pdf, // I - PDF file
off_t offset, // I - Offset
int whence) // I - Offset base
{
PDFIO_DEBUG("_pdfioFileSeek(pdf=%p, offset=%ld, whence=%d)\n", pdf, (long)offset, whence);
PDFIO_DEBUG("_pdfioFileSeek(pdf=%p, offset=%ld, whence=%d) pdf->bufpos=%lu\n", pdf, (long)offset, whence, (unsigned long)(pdf ? pdf->bufpos : 0));
// Adjust offset for relative seeks...
if (whence == SEEK_CUR)
{
offset += pdf->bufpos;
offset += pdf->bufpos + (pdf->bufptr - pdf->buffer);
whence = SEEK_SET;
}
@@ -404,7 +404,7 @@ _pdfioFileSeek(pdfio_file_t *pdf, // I - PDF file
return (-1);
}
PDFIO_DEBUG("_pdfioFileSeek: Reset bufpos=%ld.\n", (long)pdf->bufpos);
PDFIO_DEBUG("_pdfioFileSeek: Reset bufpos=%ld, offset=%lu.\n", (long)pdf->bufpos, (unsigned long)offset);
PDFIO_DEBUG("_pdfioFileSeek: buffer=%p, bufptr=%p, bufend=%p\n", pdf->buffer, pdf->bufptr, pdf->bufend);
pdf->bufpos = offset;