#ifndef IMAGER_IOLAYERT_H #define IMAGER_IOLAYERT_H #ifndef _MSC_VER #include #endif #include #include 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 */ typedef struct { io_type type; int fd; } io_fdseek; typedef struct { io_type type; /* Must be first parameter */ char *name; /* Data source name */ char *data; size_t len; i_io_closebufp_t closecb; /* free memory mapped segment or decrement refcount */ void *closedata; } io_buffer; typedef struct { io_type type; /* Must be first parameter */ char *name; /* Data source name */ void *p; /* Callback data */ i_io_readl_t readcb; i_io_writel_t writecb; i_io_seekl_t seekcb; i_io_closel_t closecb; i_io_destroyl_t destroycb; } io_cb; typedef union { io_type type; io_fdseek fdseek; io_buffer buffer; io_cb cb; } io_obj; struct i_io_glue_t { io_obj source; int flags; /* Flags */ void *exdata; /* Pair specific data */ 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; }; #define i_io_type(ig) ((ig)->source.ig_type) #define i_io_read(ig, buf, size) ((ig)->readcb((ig), (buf), (size))) #define i_io_write(ig, data, size) ((ig)->writecb((ig), (data), (size))) #define i_io_seek(ig, offset, whence) ((ig)->seekcb((ig), (offset), (whence))) #define i_io_close(ig) ((ig)->closecb(ig)) #endif