1 #ifndef IMAGER_IOLAYERT_H
2 #define IMAGER_IOLAYERT_H
11 typedef enum { FDSEEK, FDNOSEEK, BUFFER, CBSEEK, CBNOSEEK, BUFCHAIN } io_type;
17 typedef struct i_io_glue_t i_io_glue_t;
19 /* compatibility for now */
20 typedef i_io_glue_t io_glue;
22 /* Callbacks we give out */
24 typedef ssize_t(*i_io_readp_t) (io_glue *ig, void *buf, size_t count);
25 typedef ssize_t(*i_io_writep_t)(io_glue *ig, const void *buf, size_t count);
26 typedef off_t (*i_io_seekp_t) (io_glue *ig, off_t offset, int whence);
27 typedef int (*i_io_closep_t)(io_glue *ig);
28 typedef ssize_t(*i_io_sizep_t) (io_glue *ig);
30 typedef void (*i_io_closebufp_t)(void *p);
31 typedef void (*i_io_destroyp_t)(i_io_glue_t *ig);
34 /* Callbacks we get */
36 typedef ssize_t(*i_io_readl_t) (void *p, void *buf, size_t count);
37 typedef ssize_t(*i_io_writel_t)(void *p, const void *buf, size_t count);
38 typedef off_t (*i_io_seekl_t) (void *p, off_t offset, int whence);
39 typedef int (*i_io_closel_t)(void *p);
40 typedef void (*i_io_destroyl_t)(void *p);
41 typedef ssize_t(*i_io_sizel_t) (void *p);
43 extern char *io_type_names[];
47 /* Structures to describe data sources */
55 io_type type; /* Must be first parameter */
56 char *name; /* Data source name */
59 i_io_closebufp_t closecb; /* free memory mapped segment or decrement refcount */
64 io_type type; /* Must be first parameter */
65 char *name; /* Data source name */
66 void *p; /* Callback data */
68 i_io_writel_t writecb;
70 i_io_closel_t closecb;
71 i_io_destroyl_t destroycb;
83 int flags; /* Flags */
84 void *exdata; /* Pair specific data */
86 i_io_writep_t writecb;
88 i_io_closep_t closecb;
90 i_io_destroyp_t destroycb;
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))