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/*
* Stream API for Fitz.
* Read and write data to and from files, memory buffers and filters.
*/
typedef struct fz_stream_s fz_stream;
enum { FZ_SFILE, FZ_SBUFFER, FZ_SFILTER };
enum { FZ_SREAD, FZ_SWRITE };
struct fz_stream_s
{
int refs;
int kind;
int mode;
int dead;
fz_buffer *buffer;
fz_filter *filter;
fz_stream *chain;
fz_error *error; /* delayed error from readbyte and peekbyte */
int file;
};
/*
* Various stream creation functions.
*/
/* open() and creat() & co */
fz_error *fz_openrfile(fz_stream **stmp, char *filename);
fz_error *fz_openwfile(fz_stream **stmp, char *filename);
fz_error *fz_openafile(fz_stream **stmp, char *filename);
/* write to memory buffers! */
fz_error *fz_openrmemory(fz_stream **stmp, char *mem, int len);
fz_error *fz_openrbuffer(fz_stream **stmp, fz_buffer *buf);
fz_error *fz_openwbuffer(fz_stream **stmp, fz_buffer *buf);
/* almost like fork() exec() pipe() */
fz_error *fz_openrfilter(fz_stream **stmp, fz_filter *flt, fz_stream *chain);
fz_error *fz_openwfilter(fz_stream **stmp, fz_filter *flt, fz_stream *chain);
/*
* Functions that are common to both input and output streams.
*/
fz_stream *fz_keepstream(fz_stream *stm);
void fz_dropstream(fz_stream *stm);
int fz_tell(fz_stream *stm);
fz_error * fz_seek(fz_stream *stm, int offset, int whence);
/*
* Input stream functions.
*/
int fz_rtell(fz_stream *stm);
fz_error * fz_rseek(fz_stream *stm, int offset, int whence);
fz_error * fz_readimp(fz_stream *stm);
fz_error * fz_read(int *np, fz_stream *stm, unsigned char *buf, int len);
fz_error * fz_readall(fz_buffer **bufp, fz_stream *stm, int sizehint);
fz_error * fz_readline(fz_stream *stm, char *buf, int max);
/*
* Error handling when reading with readbyte/peekbyte is non-standard.
* The cause of an error is stuck into the stream struct,
* and EOF is returned. Not good, but any other way is too painful.
* So we have to be careful to check the error status eventually.
*/
fz_error *fz_readerror(fz_stream *stm);
int fz_readbytex(fz_stream *stm);
int fz_peekbytex(fz_stream *stm);
#ifdef DEBUG
#define fz_readbyte fz_readbytex
#define fz_peekbyte fz_peekbytex
#else
static inline int fz_readbyte(fz_stream *stm)
{
fz_buffer *buf = stm->buffer;
if (buf->rp < buf->wp)
return *buf->rp++;
return fz_readbytex(stm);
}
static inline int fz_peekbyte(fz_stream *stm)
{
fz_buffer *buf = stm->buffer;
if (buf->rp < buf->wp)
return *buf->rp;
return fz_peekbytex(stm);
}
#endif
/*
* Output stream functions.
*/
int fz_wtell(fz_stream *stm);
fz_error * fz_wseek(fz_stream *stm, int offset, int whence);
fz_error * fz_write(fz_stream *stm, unsigned char *buf, int n);
fz_error * fz_flush(fz_stream *stm);
fz_error * fz_printstr(fz_stream *stm, char *s);
fz_error * fz_printobj(fz_stream *stm, fz_obj *obj, int tight);
fz_error * fz_print(fz_stream *stm, char *fmt, ...);
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