/
iolayert.h
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/
iolayert.h
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#ifndef IMAGER_IOLAYERT_H
#define IMAGER_IOLAYERT_H
#ifndef _MSC_VER
#include <unistd.h>
#endif
#include <sys/types.h>
#include <stddef.h>
#include <stdio.h>
typedef enum { FDSEEK, FDNOSEEK, BUFFER, CBSEEK, CBNOSEEK, BUFCHAIN } io_type;
#ifdef _MSC_VER
typedef int ssize_t;
#endif
typedef struct i_io_glue_t i_io_glue_t;
/* compatibility for now */
typedef i_io_glue_t io_glue;
/* Callbacks we give out */
typedef ssize_t(*i_io_readp_t) (io_glue *ig, void *buf, size_t count);
typedef ssize_t(*i_io_writep_t)(io_glue *ig, const void *buf, size_t count);
typedef off_t (*i_io_seekp_t) (io_glue *ig, off_t offset, int whence);
typedef int (*i_io_closep_t)(io_glue *ig);
typedef ssize_t(*i_io_sizep_t) (io_glue *ig);
typedef void (*i_io_closebufp_t)(void *p);
typedef void (*i_io_destroyp_t)(i_io_glue_t *ig);
/* Callbacks we get */
typedef ssize_t(*i_io_readl_t) (void *p, void *buf, size_t count);
typedef ssize_t(*i_io_writel_t)(void *p, const void *buf, size_t count);
typedef off_t (*i_io_seekl_t) (void *p, off_t offset, int whence);
typedef int (*i_io_closel_t)(void *p);
typedef void (*i_io_destroyl_t)(void *p);
typedef ssize_t(*i_io_sizel_t) (void *p);
extern char *io_type_names[];
/* Structures to describe data sources */
struct i_io_glue_t {
io_type type;
void *exdata;
i_io_readp_t readcb;
i_io_writep_t writecb;
i_io_seekp_t seekcb;
i_io_closep_t closecb;
i_io_sizep_t sizecb;
i_io_destroyp_t destroycb;
unsigned char *buffer;
unsigned char *read_ptr;
unsigned char *read_end;
unsigned char *write_ptr;
unsigned char *write_end;
size_t buf_size;
/* non-zero if we encountered EOF */
int buf_eof;
/* non-zero if we've seen an error */
int error;
/* if non-zero we do write buffering (enabled by default) */
int buffered;
};
#define I_IO_DUMP_CALLBACKS 1
#define I_IO_DUMP_BUFFER 2
#define I_IO_DUMP_STATUS 4
#define I_IO_DUMP_DEFAULT (I_IO_DUMP_BUFFER | I_IO_DUMP_STATUS)
#define i_io_type(ig) ((ig)->source.ig_type)
#define i_io_raw_read(ig, buf, size) ((ig)->readcb((ig), (buf), (size)))
#define i_io_raw_write(ig, data, size) ((ig)->writecb((ig), (data), (size)))
#define i_io_raw_seek(ig, offset, whence) ((ig)->seekcb((ig), (offset), (whence)))
#define i_io_raw_close(ig) ((ig)->closecb(ig))
#define i_io_is_buffered(ig) ((int)((ig)->buffered))
#define i_io_getc(ig) \
((ig)->read_ptr < (ig)->read_end ? \
*((ig)->read_ptr++) : \
i_io_getc_imp(ig))
#define i_io_peekc(ig) \
((ig)->read_ptr < (ig)->read_end ? \
*((ig)->read_ptr) : \
i_io_peekc_imp(ig))
#define i_io_putc(ig, c) \
((ig)->write_ptr < (ig)->write_end && !(ig)->error ? \
*(ig)->write_ptr++ = (c) : \
i_io_putc_imp(ig, (c)))
#define i_io_eof(ig) \
((ig)->read_ptr == (ig)->read_end && (ig)->buf_eof)
#define i_io_error(ig) \
((ig)->read_ptr == (ig)->read_end && (ig)->error)
#endif