91 lines
2.6 KiB
C++
Executable File
91 lines
2.6 KiB
C++
Executable File
// virtual file system - transparent access to files in archives;
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// allows multiple mount points
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//
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// Copyright (c) 2004 Jan Wassenberg
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// Contact info:
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// Jan.Wassenberg@stud.uni-karlsruhe.de
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// http://www.stud.uni-karlsruhe.de/~urkt/
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#ifndef __VFS_H__
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#define __VFS_H__
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#include "h_mgr.h"
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#include "posix.h" // struct stat
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// the VFS doesn't require this length restriction - VFS internal storage
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// is not fixed-length. the purpose here is to allow fixed-sized path buffers
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// allocated on the stack.
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//
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// length includes trailing '\0'.
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#define VFS_MAX_PATH 256
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extern int vfs_mount(const char* vfs_mount_point, const char* name, uint pri);
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extern int vfs_umount(const char* name);
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extern int vfs_stat(const char* fn, struct stat*);
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extern int vfs_realpath(const char* fn, char* realpath);
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extern Handle vfs_load(const char* fn, void*& p, size_t& size);
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extern Handle vfs_open(const char* fn, uint flags = 0);
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extern int vfs_close(Handle& h);
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extern Handle vfs_map(Handle hf, uint flags, void*& p, size_t& size);
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struct vfsDirEnt
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{
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// the filename is currently stored internally as std::string. returning as char* for C compat
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// stored internally as std::string. returning as char* for C compat
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// would mean we have to return a copy. we try to avoid fixed-size
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// buffers, so that leaves a reference.
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const char* name;
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};
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extern Handle vfs_open_dir(const char* path);
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extern int vfs_close_dir(Handle& hd);
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extern int vfs_next_dirent(Handle hd, vfsDirEnt* ent, const char* filter);
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extern int vfs_rebuild();
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//
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// async read interface
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//
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extern Handle vfs_start_read(const Handle hf, size_t ofs, size_t& advance, void* buf);
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extern int vfs_wait_read(Handle hr, void*& p, size_t& size);
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extern int vfs_discard_read(Handle& hr);
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extern ssize_t vfs_io(Handle hf, size_t ofs, size_t size, void*& p);
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// keep in sync with File flags!
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enum
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{
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VFS_WRITE = 1, // write-only access; otherwise, read only
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VFS_MEM_READONLY = 2, // !want to be able to change in memory data
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VFS_NOCACHE = 4, // don't cache whole file, e.g. if cached on a higher level
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VFS_RANDOM = 8 // random access hint, allow offset
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};
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#endif // #ifndef __VFS_H__
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