document the new test image functions
[imager.git] / iolayert.h
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1#ifndef IMAGER_IOLAYERT_H
2#define IMAGER_IOLAYERT_H
3
4#ifndef _MSC_VER
5#include <unistd.h>
6#endif
7#include <sys/types.h>
f6d10024 8#include <stddef.h>
8d14daab 9#include <stdio.h>
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10
11typedef enum { FDSEEK, FDNOSEEK, BUFFER, CBSEEK, CBNOSEEK, BUFCHAIN } io_type;
12
13#ifdef _MSC_VER
14typedef int ssize_t;
15#endif
16
17typedef struct i_io_glue_t i_io_glue_t;
18
19/* compatibility for now */
20typedef i_io_glue_t io_glue;
21
22/* Callbacks we give out */
23
24typedef ssize_t(*i_io_readp_t) (io_glue *ig, void *buf, size_t count);
25typedef ssize_t(*i_io_writep_t)(io_glue *ig, const void *buf, size_t count);
26typedef off_t (*i_io_seekp_t) (io_glue *ig, off_t offset, int whence);
2b405c9e 27typedef int (*i_io_closep_t)(io_glue *ig);
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28typedef ssize_t(*i_io_sizep_t) (io_glue *ig);
29
30typedef void (*i_io_closebufp_t)(void *p);
31typedef void (*i_io_destroyp_t)(i_io_glue_t *ig);
32
33
34/* Callbacks we get */
35
36typedef ssize_t(*i_io_readl_t) (void *p, void *buf, size_t count);
37typedef ssize_t(*i_io_writel_t)(void *p, const void *buf, size_t count);
38typedef off_t (*i_io_seekl_t) (void *p, off_t offset, int whence);
2b405c9e 39typedef int (*i_io_closel_t)(void *p);
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40typedef void (*i_io_destroyl_t)(void *p);
41typedef ssize_t(*i_io_sizel_t) (void *p);
42
43extern char *io_type_names[];
44
45
46
47/* Structures to describe data sources */
48
49typedef struct {
50 io_type type;
51 int fd;
52} io_fdseek;
53
54typedef struct {
55 io_type type; /* Must be first parameter */
56 char *name; /* Data source name */
57 char *data;
58 size_t len;
59 i_io_closebufp_t closecb; /* free memory mapped segment or decrement refcount */
60 void *closedata;
61} io_buffer;
62
63typedef struct {
64 io_type type; /* Must be first parameter */
65 char *name; /* Data source name */
66 void *p; /* Callback data */
67 i_io_readl_t readcb;
68 i_io_writel_t writecb;
69 i_io_seekl_t seekcb;
70 i_io_closel_t closecb;
71 i_io_destroyl_t destroycb;
72} io_cb;
73
74typedef union {
75 io_type type;
76 io_fdseek fdseek;
77 io_buffer buffer;
78 io_cb cb;
79} io_obj;
80
81struct i_io_glue_t {
82 io_obj source;
83 int flags; /* Flags */
84 void *exdata; /* Pair specific data */
85 i_io_readp_t readcb;
86 i_io_writep_t writecb;
87 i_io_seekp_t seekcb;
88 i_io_closep_t closecb;
89 i_io_sizep_t sizecb;
90 i_io_destroyp_t destroycb;
91};
92
93#define i_io_type(ig) ((ig)->source.ig_type)
94#define i_io_read(ig, buf, size) ((ig)->readcb((ig), (buf), (size)))
95#define i_io_write(ig, data, size) ((ig)->writecb((ig), (data), (size)))
96#define i_io_seek(ig, offset, whence) ((ig)->seekcb((ig), (offset), (whence)))
97#define i_io_close(ig) ((ig)->closecb(ig))
98
99
100#endif