79 lines
1.8 KiB
C
Executable File
79 lines
1.8 KiB
C
Executable File
// file layer on top of POSIX.
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// provides streaming support and caching.
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//
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// Copyright (c) 2004 Jan Wassenberg
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//
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// This file 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 file 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 FILE_H
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#define FILE_H
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#include "h_mgr.h"
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#include "lib.h"
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struct File
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{
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#ifdef PARANOIA
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u32 magic;
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#endif
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size_t size;
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int flags;
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u32 fn_hash;
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void* mapping;
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int fd;
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};
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enum
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{
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// open for writing
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FILE_WRITE = 1,
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FILE_MEM_READONLY = 2,
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// do not cache any part of the file
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// (e.g. if caching on a higher level)
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FILE_NO_CACHE = 4,
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};
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extern int file_open(const char* path, int flags, File* f);
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extern int file_close(File* f);
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extern int file_map(File* f, void*& p, size_t& size);
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extern int file_unmap(File* f);
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extern Handle file_start_io(File* f, size_t ofs, size_t size, void* buf);
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extern int file_wait_io(const Handle hio, void*& p, size_t& size);
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extern int file_discard_io(Handle& hio);
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// return value:
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// < 0: failed (do not call again) - abort transfer.
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// = 0: done (no more data needed) - stop transfer gracefully.
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// > 0: bytes output (not used ATM; useful for statistics) - continue.
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typedef ssize_t(*FILE_IO_CB)(uintptr_t ctx, void* p, size_t size);
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extern ssize_t file_io(File* f, size_t ofs, size_t size, void** p,
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FILE_IO_CB cb = 0, uintptr_t ctx = 0);
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#endif // #ifndef FILE_H
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