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Implement object loading.

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This commit is contained in:
Michael R Sweet
2021-05-04 17:04:09 -04:00
parent 7733fbeb10
commit 7afdfc725c
3 changed files with 76 additions and 6 deletions
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69
pdfio-object.c
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@ -122,3 +122,72 @@ pdfioObjOpenStream(pdfio_obj_t *obj) // I - Object
return (NULL);
}
//
// '()' - Load an object dictionary/value.
//
bool // O - `true` on success, `false` otherwise
_pdfioObjLoad(pdfio_obj_t *obj) // I - Object
{
char line[1024], // Line from file
*ptr; // Pointer into line
// Seek to the start of the object and read its header...
if (_pdfioFileSeek(obj->pdf, obj->offset, SEEK_SET) != obj->offset)
{
_pdfioFileError(obj->pdf, "Unable to seek to object %lu.", (unsigned long)obj->number);
return (false);
}
if (!_pdfioFileGets(obj->pdf, line, sizeof(line)))
{
_pdfioFileError(obj->pdf, "Unable to read header for object %lu.", (unsigned long)obj->number);
return (false);
}
if (strtoimax(line, &ptr, 10) != (intmax_t)obj->number)
{
_pdfioFileError(obj->pdf, "Bad header for object %lu.", (unsigned long)obj->number);
return (false);
}
if (strtol(ptr, &ptr, 10) != (long)obj->generation)
{
_pdfioFileError(obj->pdf, "Bad header for object %lu.", (unsigned long)obj->number);
return (false);
}
while (isspace(*ptr & 255))
ptr ++;
if (strcmp(ptr, "obj"))
{
_pdfioFileError(obj->pdf, "Bad header for object %lu.", (unsigned long)obj->number);
return (false);
}
// Then grab the object value...
if (!_pdfioValueRead(obj->pdf, &obj->value))
{
_pdfioFileError(obj->pdf, "Unable to read value for object %lu.", (unsigned long)obj->number);
return (false);
}
// Now see if there is an associated stream...
if (!_pdfioFileGets(obj->pdf, line, sizeof(line)))
{
_pdfioFileError(obj->pdf, "Early end-of-file for object %lu.", (unsigned long)obj->number);
return (false);
}
if (!strcmp(line, "stream"))
{
// Yes, save its location...
obj->stream_offset = _pdfioFileTell(obj->pdf);
}
return (true);
}