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Rework token reading to be separate from the PDF file so we can add support

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for compressed object streams.
This commit is contained in:
Michael R Sweet
2021-05-08 07:38:44 -04:00
parent 923409ceff
commit 9a919d478f
9 changed files with 211 additions and 166 deletions
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36
pdfio-private.h
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@ -80,6 +80,22 @@ typedef enum _pdfio_predictor_e // PNG predictor constants
_PDFIO_PREDICTOR_PNG_PAETH = 14 // PNG Paeth predictor
} _pdfio_predictor_t;
typedef ssize_t (*_pdfio_tconsume_cb_t)(void *data, size_t bytes);
typedef ssize_t (*_pdfio_tpeek_cb_t)(void *data, void *buffer, size_t bytes);
typedef struct _pdfio_token_s // Token buffer/stack
{
pdfio_file_t *pdf; // PDF file
_pdfio_tconsume_cb_t consume_cb; // Consume callback
_pdfio_tpeek_cb_t peek_cb; // Peek callback
void *cb_data; // Callback data
unsigned char buffer[32], // Buffer
*bufptr, // Pointer into buffer
*bufend; // Last valid byte in buffer
size_t num_tokens; // Number of tokens in stack
char *tokens[4]; // Token stack
} _pdfio_token_t;
typedef struct _pdfio_value_s // Value structure
{
pdfio_valtype_t type; // Type of value
@ -163,8 +179,6 @@ struct _pdfio_file_s // PDF file structure
size_t num_strings, // Number of strings
alloc_strings; // Allocated strings
char **strings; // Nul-terminated strings
size_t num_tokens; // Number of tokens in stack
char *tokens[4]; // Token stack
};
struct _pdfio_obj_s // Object
@ -198,9 +212,6 @@ struct _pdfio_stream_s // Stream
*pbuffers[2]; // Predictor buffers, as needed
};
typedef ssize_t (*_pdfio_tconsume_cb_t)(void *data, size_t bytes);
typedef ssize_t (*_pdfio_tpeek_cb_t)(void *data, void *buffer, size_t bytes);
//
// Functions...
@ -211,7 +222,7 @@ extern void _pdfioArrayDebug(pdfio_array_t *a) PDFIO_INTERNAL;
# endif // DEBUG
extern void _pdfioArrayDelete(pdfio_array_t *a) PDFIO_INTERNAL;
extern _pdfio_value_t *_pdfioArrayGetValue(pdfio_array_t *a, size_t n) PDFIO_INTERNAL;
extern pdfio_array_t *_pdfioArrayRead(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern pdfio_array_t *_pdfioArrayRead(pdfio_file_t *pdf, _pdfio_token_t *ts) PDFIO_INTERNAL;
extern bool _pdfioArrayWrite(pdfio_array_t *a) PDFIO_INTERNAL;
# ifdef DEBUG
@ -219,21 +230,18 @@ extern void _pdfioDictDebug(pdfio_dict_t *dict) PDFIO_INTERNAL;
# endif // DEBUG
extern void _pdfioDictDelete(pdfio_dict_t *dict) PDFIO_INTERNAL;
extern _pdfio_value_t *_pdfioDictGetValue(pdfio_dict_t *dict, const char *key) PDFIO_INTERNAL;
extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern pdfio_dict_t *_pdfioDictRead(pdfio_file_t *pdf, _pdfio_token_t *ts) PDFIO_INTERNAL;
extern bool _pdfioDictSetValue(pdfio_dict_t *dict, const char *key, _pdfio_value_t *value) PDFIO_INTERNAL;
extern bool _pdfioDictWrite(pdfio_dict_t *dict, off_t *length) PDFIO_INTERNAL;
extern void _pdfioFileClearTokens(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern bool _pdfioFileConsume(pdfio_file_t *pdf, size_t bytes) PDFIO_INTERNAL;
extern bool _pdfioFileDefaultError(pdfio_file_t *pdf, const char *message, void *data) PDFIO_INTERNAL;
extern bool _pdfioFileError(pdfio_file_t *pdf, const char *format, ...) PDFIO_FORMAT(2,3) PDFIO_INTERNAL;
extern bool _pdfioFileFlush(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern int _pdfioFileGetChar(pdfio_file_t *pdf) PDFIO_INTERNAL;
extern bool _pdfioFileGetToken(pdfio_file_t *pdf, char *buffer, size_t bufsize) PDFIO_INTERNAL;
extern bool _pdfioFileGets(pdfio_file_t *pdf, char *buffer, size_t bufsize) PDFIO_INTERNAL;
extern ssize_t _pdfioFilePeek(pdfio_file_t *pdf, void *buffer, size_t bytes) PDFIO_INTERNAL;
extern bool _pdfioFilePrintf(pdfio_file_t *pdf, const char *format, ...) PDFIO_FORMAT(2,3) PDFIO_INTERNAL;
extern void _pdfioFilePushToken(pdfio_file_t *pdf, const char *token) PDFIO_INTERNAL;
extern bool _pdfioFilePuts(pdfio_file_t *pdf, const char *s) PDFIO_INTERNAL;
extern ssize_t _pdfioFileRead(pdfio_file_t *pdf, void *buffer, size_t bytes) PDFIO_INTERNAL;
extern off_t _pdfioFileSeek(pdfio_file_t *pdf, off_t offset, int whence) PDFIO_INTERNAL;
@ -248,14 +256,18 @@ extern pdfio_stream_t *_pdfioStreamOpen(pdfio_obj_t *obj, bool decode) PDFIO_INT
extern bool _pdfioStringIsAllocated(pdfio_file_t *pdf, const char *s) PDFIO_INTERNAL;
extern bool _pdfioTokenRead(pdfio_file_t *pdf, char *buffer, size_t bufsize, _pdfio_tpeek_cb_t peek_cb, _pdfio_tconsume_cb_t consume_cb, void *data);
extern void _pdfioTokenClear(_pdfio_token_t *ts) PDFIO_INTERNAL;
extern bool _pdfioTokenGet(_pdfio_token_t *ts, char *buffer, size_t bufsize) PDFIO_INTERNAL;
extern void _pdfioTokenInit(_pdfio_token_t *ts, pdfio_file_t *pdf, _pdfio_tconsume_cb_t consume_cb, _pdfio_tpeek_cb_t peek_cb, void *cb_data);
extern void _pdfioTokenPush(_pdfio_token_t *ts, const char *token) PDFIO_INTERNAL;
extern bool _pdfioTokenRead(_pdfio_token_t *ts, char *buffer, size_t bufsize);
extern _pdfio_value_t *_pdfioValueCopy(pdfio_file_t *pdfdst, _pdfio_value_t *vdst, pdfio_file_t *pdfsrc, _pdfio_value_t *vsrc) PDFIO_INTERNAL;
# ifdef DEBUG
extern void _pdfioValueDebug(_pdfio_value_t *v) PDFIO_INTERNAL;
# endif // DEBUG
extern void _pdfioValueDelete(_pdfio_value_t *v) PDFIO_INTERNAL;
extern _pdfio_value_t *_pdfioValueRead(pdfio_file_t *pdf, _pdfio_value_t *v) PDFIO_INTERNAL;
extern _pdfio_value_t *_pdfioValueRead(pdfio_file_t *pdf, _pdfio_token_t *ts, _pdfio_value_t *v) PDFIO_INTERNAL;
extern bool _pdfioValueWrite(pdfio_file_t *pdf, _pdfio_value_t *v) PDFIO_INTERNAL;
#endif // !PDFIO_PRIVATE_H