111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
#ifndef IMAGER_IOLAYERT_H
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#define IMAGER_IOLAYERT_H
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#ifndef _MSC_VER
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#include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <stddef.h>
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#include <stdio.h>
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typedef enum { FDSEEK, FDNOSEEK, BUFFER, CBSEEK, CBNOSEEK, BUFCHAIN } io_type;
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#ifdef _MSC_VER
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typedef int ssize_t;
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#endif
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typedef struct i_io_glue_t i_io_glue_t;
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/* compatibility for now */
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typedef i_io_glue_t io_glue;
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/* Callbacks we give out */
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typedef ssize_t(*i_io_readp_t) (io_glue *ig, void *buf, size_t count);
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typedef ssize_t(*i_io_writep_t)(io_glue *ig, const void *buf, size_t count);
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typedef off_t (*i_io_seekp_t) (io_glue *ig, off_t offset, int whence);
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typedef int (*i_io_closep_t)(io_glue *ig);
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typedef ssize_t(*i_io_sizep_t) (io_glue *ig);
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typedef void (*i_io_closebufp_t)(void *p);
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typedef void (*i_io_destroyp_t)(i_io_glue_t *ig);
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/* Callbacks we get */
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typedef ssize_t(*i_io_readl_t) (void *p, void *buf, size_t count);
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typedef ssize_t(*i_io_writel_t)(void *p, const void *buf, size_t count);
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typedef off_t (*i_io_seekl_t) (void *p, off_t offset, int whence);
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typedef int (*i_io_closel_t)(void *p);
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typedef void (*i_io_destroyl_t)(void *p);
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typedef ssize_t(*i_io_sizel_t) (void *p);
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extern char *io_type_names[];
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/* Structures to describe data sources */
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struct i_io_glue_t {
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io_type type;
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void *exdata;
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i_io_readp_t readcb;
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i_io_writep_t writecb;
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i_io_seekp_t seekcb;
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i_io_closep_t closecb;
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i_io_sizep_t sizecb;
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i_io_destroyp_t destroycb;
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unsigned char *buffer;
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unsigned char *read_ptr;
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unsigned char *read_end;
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unsigned char *write_ptr;
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unsigned char *write_end;
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size_t buf_size;
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/* non-zero if we encountered EOF */
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int buf_eof;
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/* non-zero if we've seen an error */
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int error;
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/* if non-zero we do write buffering (enabled by default) */
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int buffered;
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im_context_t context;
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};
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#define I_IO_DUMP_CALLBACKS 1
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#define I_IO_DUMP_BUFFER 2
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#define I_IO_DUMP_STATUS 4
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#define I_IO_DUMP_DEFAULT (I_IO_DUMP_BUFFER | I_IO_DUMP_STATUS)
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#define i_io_type(ig) ((ig)->source.ig_type)
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#define i_io_raw_read(ig, buf, size) ((ig)->readcb((ig), (buf), (size)))
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#define i_io_raw_write(ig, data, size) ((ig)->writecb((ig), (data), (size)))
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#define i_io_raw_seek(ig, offset, whence) ((ig)->seekcb((ig), (offset), (whence)))
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#define i_io_raw_close(ig) ((ig)->closecb(ig))
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#define i_io_is_buffered(ig) ((int)((ig)->buffered))
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#define i_io_getc(ig) \
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((ig)->read_ptr < (ig)->read_end ? \
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*((ig)->read_ptr++) : \
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i_io_getc_imp(ig))
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#define i_io_nextc(ig) \
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((void)((ig)->read_ptr < (ig)->read_end ? \
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((ig)->read_ptr++, 0) : \
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i_io_getc_imp(ig)))
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#define i_io_peekc(ig) \
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((ig)->read_ptr < (ig)->read_end ? \
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*((ig)->read_ptr) : \
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i_io_peekc_imp(ig))
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#define i_io_putc(ig, c) \
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((ig)->write_ptr < (ig)->write_end && !(ig)->error ? \
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*(ig)->write_ptr++ = (c) : \
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i_io_putc_imp(ig, (c)))
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#define i_io_eof(ig) \
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((ig)->read_ptr == (ig)->read_end && (ig)->buf_eof)
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#define i_io_error(ig) \
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((ig)->read_ptr == (ig)->read_end && (ig)->error)
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#endif
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