119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2012.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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Sortix. If not, see <http://www.gnu.org/licenses/>.
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fs/util.cpp
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Utility classes for kernel filesystems.
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*******************************************************************************/
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#include <errno.h>
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#include <string.h>
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#include <sortix/stat.h>
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#include <sortix/seek.h>
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#include <sortix/kernel/inode.h>
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#include <sortix/kernel/interlock.h>
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#include <sortix/kernel/ioctx.h>
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#include <sortix/kernel/kernel.h>
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#include <sortix/kernel/kthread.h>
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#include <sortix/kernel/refcount.h>
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#include "util.h"
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namespace Sortix {
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UtilMemoryBuffer::UtilMemoryBuffer(dev_t dev, ino_t ino, uid_t owner,
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gid_t group, mode_t mode, uint8_t* buf,
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size_t bufsize, bool write, bool deletebuf)
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{
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inode_type = INODE_TYPE_FILE;
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this->filelock = KTHREAD_MUTEX_INITIALIZER;
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this->stat_uid = owner;
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this->stat_gid = group;
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this->type = S_IFREG;
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this->stat_mode = (mode & S_SETABLE) | this->type;
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this->stat_blksize = 1;
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this->stat_size = (off_t) bufsize;
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this->dev = dev;
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this->ino = ino ? ino : (ino_t) this;
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this->buf = buf;
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this->bufsize = bufsize;
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this->write = write;
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this->deletebuf = deletebuf;
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}
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UtilMemoryBuffer::~UtilMemoryBuffer()
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{
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if ( deletebuf )
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delete[] buf;
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}
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int UtilMemoryBuffer::truncate(ioctx_t* /*ctx*/, off_t length)
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{
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ScopedLock lock(&filelock);
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if ( (uintmax_t) length != (uintmax_t) bufsize )
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return errno = ENOTSUP, -1;
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return 0;
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}
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off_t UtilMemoryBuffer::lseek(ioctx_t* /*ctx*/, off_t offset, int whence)
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{
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ScopedLock lock(&filelock);
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if ( whence == SEEK_SET )
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return offset;
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if ( whence == SEEK_END )
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return (off_t) bufsize + offset;
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errno = EINVAL;
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return -1;
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}
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ssize_t UtilMemoryBuffer::pread(ioctx_t* ctx, uint8_t* dest, size_t count,
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off_t off)
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{
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ScopedLock lock(&filelock);
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if ( (uintmax_t) bufsize < (uintmax_t) off )
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return 0;
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size_t available = bufsize - off;
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if ( available < count )
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count = available;
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if ( !ctx->copy_to_dest(dest, buf + off, count) )
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return -1;
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return count;
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}
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ssize_t UtilMemoryBuffer::pwrite(ioctx_t* ctx, const uint8_t* src, size_t count,
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off_t off)
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{
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ScopedLock lock(&filelock);
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if ( !write ) { errno = EBADF; return -1; }
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// TODO: Avoid having off + count overflow!
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if ( bufsize < off + count )
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return 0;
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if ( (uintmax_t) bufsize <= (uintmax_t) off )
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return -1;
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size_t available = bufsize - off;
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if ( available < count )
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count = available;
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ctx->copy_from_src(buf + off, src, count);
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return count;
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}
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} // namespace Sortix
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