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/*
* Author:
* Guido Draheim <guidod@gmx.de>
*
* Copyright (c) Guido Draheim, use under copyleft
*
* the interfaces for the plugin_io system
*
* Using the following you can provide your own file I/O functions to
* e.g. read data directly from memory, provide simple
* "encryption"/"decryption" of on-disk .zip-files...
* Note that this currently only provides a subset of the functionality
* in zziplib. It does not attempt to provide any directory functions,
* but if your program 1) only uses ordinary on-disk files and you
* just want this for file obfuscation, or 2) you only access your
* .zip archives using zzip_open & co., this is sufficient.
*
* Currently the default io are the POSIX functions, except
* for 'filesize' that is zziplibs own provided zzip_filesize function,
* using standard POSIX fd's. You are however free to replace this with
* whatever data type you need, so long as you provide implementations
* for all the functions, and the data type fits an int.
*
* all functions receiving ext_io are able to cope with both arguments
* set to zero which will let them default to a ZIP ext and posix io.
*/
#ifndef _ZZIP_PLUGIN_H /* zzip-io.h */
#define _ZZIP_PLUGIN_H 1
#include <zzip/zzip.h>
#ifdef __cplusplus
extern "C" {
#endif
/* we have renamed zzip_plugin_io.use_mmap to zzip_plugin_io.sys */
#define ZZIP_PLUGIN_IO_SYS 1
struct zzip_plugin_io { /* use "zzip_plugin_io_handlers" in applications !! */
int (*open)(zzip_char_t* name, int flags, ...);
int (*close)(int fd);
zzip_ssize_t (*read)(int fd, void* buf, zzip_size_t len);
zzip_off_t (*seeks)(int fd, zzip_off_t offset, int whence);
zzip_off_t (*filesize)(int fd);
long sys;
long type;
zzip_ssize_t (*write)(int fd, _zzip_const void* buf, zzip_size_t len);
};
typedef union _zzip_plugin_io
{
struct zzip_plugin_io fd;
struct { void* padding[8]; } ptr;
} zzip_plugin_io_handlers;
#define _zzip_plugin_io_handlers zzip_plugin_io_handlers
/* for backward compatibility, add the following to your application code:
* #ifndef _zzip_plugin_io_handlers
* #define _zzip_plugin_io_handlers struct zzip_plugin_io
*/
typedef zzip_plugin_io_handlers* zzip_plugin_io_handlers_t;
#ifdef ZZIP_LARGEFILE_RENAME
#define zzip_filesize zzip_filesize64
#define zzip_get_default_io zzip_get_default_io64
#define zzip_init_io zzip_init_io64
#endif
_zzip_export zzip_off_t
zzip_filesize(int fd);
/* get the default file I/O functions.
* This functions returns a pointer to an internal static structure.
*/
_zzip_export zzip_plugin_io_t zzip_get_default_io(void);
/*
* Initializes a zzip_plugin_io_t to the zziplib default io.
* This is useful if you only want to override e.g. the 'read' function.
* all zzip functions that can receive a zzip_plugin_io_t can
* handle a zero pointer in that place and default to posix io.
*/
_zzip_export
int zzip_init_io(zzip_plugin_io_handlers_t io, int flags);
/* zzip_init_io flags : */
# define ZZIP_IO_USE_MMAP 1
#ifdef __cplusplus
}
#endif
#endif
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