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Save work on PNG predictors. Apparently object streams are also a common thing

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for newer Acrobat so we'll need to implement those, too.
This commit is contained in:
Michael R Sweet
2021-05-07 19:51:38 -04:00
parent 44325ce2d9
commit 923409ceff
3 changed files with 254 additions and 57 deletions
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8
pdfio-private.h
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@ -190,7 +190,12 @@ struct _pdfio_stream_s // Stream
*bufptr, // Current position in buffer
*bufend; // End of buffer
z_stream flate; // Flate filter state
char cbuffer[4096]; // Compressed data buffer
_pdfio_predictor_t predictor; // Predictor function, if any
int pbcurrent; // Current predictor line (0 or 1)
size_t pbpixel, // Size of a pixel in bytes
pbsize; // Predictor buffer size, if any
unsigned char cbuffer[4096], // Compressed data buffer
*pbuffers[2]; // Predictor buffers, as needed
};
typedef ssize_t (*_pdfio_tconsume_cb_t)(void *data, size_t bytes);
@ -239,7 +244,6 @@ extern void _pdfioObjDelete(pdfio_obj_t *obj) PDFIO_INTERNAL;
extern bool _pdfioObjLoad(pdfio_obj_t *obj) PDFIO_INTERNAL;
extern pdfio_stream_t *_pdfioStreamCreate(pdfio_obj_t *obj, pdfio_filter_t compression) PDFIO_INTERNAL;
extern void _pdfioStreamDelete(pdfio_stream_t *st) PDFIO_INTERNAL;
extern pdfio_stream_t *_pdfioStreamOpen(pdfio_obj_t *obj, bool decode) PDFIO_INTERNAL;
extern bool _pdfioStringIsAllocated(pdfio_file_t *pdf, const char *s) PDFIO_INTERNAL;