1 #ifndef IMAGER_IOLAYERT_H
2 #define IMAGER_IOLAYERT_H
10 typedef enum { FDSEEK, FDNOSEEK, BUFFER, CBSEEK, CBNOSEEK, BUFCHAIN } io_type;
16 typedef struct i_io_glue_t i_io_glue_t;
18 /* compatibility for now */
19 typedef i_io_glue_t io_glue;
21 /* Callbacks we give out */
23 typedef ssize_t(*i_io_readp_t) (io_glue *ig, void *buf, size_t count);
24 typedef ssize_t(*i_io_writep_t)(io_glue *ig, const void *buf, size_t count);
25 typedef off_t (*i_io_seekp_t) (io_glue *ig, off_t offset, int whence);
26 typedef int (*i_io_closep_t)(io_glue *ig);
27 typedef ssize_t(*i_io_sizep_t) (io_glue *ig);
29 typedef void (*i_io_closebufp_t)(void *p);
30 typedef void (*i_io_destroyp_t)(i_io_glue_t *ig);
33 /* Callbacks we get */
35 typedef ssize_t(*i_io_readl_t) (void *p, void *buf, size_t count);
36 typedef ssize_t(*i_io_writel_t)(void *p, const void *buf, size_t count);
37 typedef off_t (*i_io_seekl_t) (void *p, off_t offset, int whence);
38 typedef int (*i_io_closel_t)(void *p);
39 typedef void (*i_io_destroyl_t)(void *p);
40 typedef ssize_t(*i_io_sizel_t) (void *p);
42 extern char *io_type_names[];
46 /* Structures to describe data sources */
54 io_type type; /* Must be first parameter */
55 char *name; /* Data source name */
58 i_io_closebufp_t closecb; /* free memory mapped segment or decrement refcount */
63 io_type type; /* Must be first parameter */
64 char *name; /* Data source name */
65 void *p; /* Callback data */
67 i_io_writel_t writecb;
69 i_io_closel_t closecb;
70 i_io_destroyl_t destroycb;
82 int flags; /* Flags */
83 void *exdata; /* Pair specific data */
85 i_io_writep_t writecb;
87 i_io_closep_t closecb;
89 i_io_destroyp_t destroycb;
92 #define i_io_type(ig) ((ig)->source.ig_type)
93 #define i_io_read(ig, buf, size) ((ig)->readcb((ig), (buf), (size)))
94 #define i_io_write(ig, data, size) ((ig)->writecb((ig), (data), (size)))
95 #define i_io_seek(ig, offset, whence) ((ig)->seekcb((ig), (offset), (whence)))
96 #define i_io_close(ig) ((ig)->closecb(ig))