diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/squashfs/xz_wrapper.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/squashfs/xz_wrapper.c | 180 |
1 files changed, 0 insertions, 180 deletions
diff --git a/ANDROID_3.4.5/fs/squashfs/xz_wrapper.c b/ANDROID_3.4.5/fs/squashfs/xz_wrapper.c deleted file mode 100644 index 1760b7d1..00000000 --- a/ANDROID_3.4.5/fs/squashfs/xz_wrapper.c +++ /dev/null @@ -1,180 +0,0 @@ -/* - * Squashfs - a compressed read only filesystem for Linux - * - * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 - * Phillip Lougher <phillip@squashfs.org.uk> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2, - * or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. - * - * xz_wrapper.c - */ - - -#include <linux/mutex.h> -#include <linux/buffer_head.h> -#include <linux/slab.h> -#include <linux/xz.h> -#include <linux/bitops.h> - -#include "squashfs_fs.h" -#include "squashfs_fs_sb.h" -#include "squashfs.h" -#include "decompressor.h" - -struct squashfs_xz { - struct xz_dec *state; - struct xz_buf buf; -}; - -struct comp_opts { - __le32 dictionary_size; - __le32 flags; -}; - -static void *squashfs_xz_init(struct squashfs_sb_info *msblk, void *buff, - int len) -{ - struct comp_opts *comp_opts = buff; - struct squashfs_xz *stream; - int dict_size = msblk->block_size; - int err, n; - - if (comp_opts) { - /* check compressor options are the expected length */ - if (len < sizeof(*comp_opts)) { - err = -EIO; - goto failed; - } - - dict_size = le32_to_cpu(comp_opts->dictionary_size); - - /* the dictionary size should be 2^n or 2^n+2^(n+1) */ - n = ffs(dict_size) - 1; - if (dict_size != (1 << n) && dict_size != (1 << n) + - (1 << (n + 1))) { - err = -EIO; - goto failed; - } - } - - dict_size = max_t(int, dict_size, SQUASHFS_METADATA_SIZE); - - stream = kmalloc(sizeof(*stream), GFP_KERNEL); - if (stream == NULL) { - err = -ENOMEM; - goto failed; - } - - stream->state = xz_dec_init(XZ_PREALLOC, dict_size); - if (stream->state == NULL) { - kfree(stream); - err = -ENOMEM; - goto failed; - } - - return stream; - -failed: - ERROR("Failed to initialise xz decompressor\n"); - return ERR_PTR(err); -} - - -static void squashfs_xz_free(void *strm) -{ - struct squashfs_xz *stream = strm; - - if (stream) { - xz_dec_end(stream->state); - kfree(stream); - } -} - - -static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void **buffer, - struct buffer_head **bh, int b, int offset, int length, int srclength, - int pages) -{ - enum xz_ret xz_err; - int avail, total = 0, k = 0, page = 0; - struct squashfs_xz *stream = msblk->stream; - - mutex_lock(&msblk->read_data_mutex); - - xz_dec_reset(stream->state); - stream->buf.in_pos = 0; - stream->buf.in_size = 0; - stream->buf.out_pos = 0; - stream->buf.out_size = PAGE_CACHE_SIZE; - stream->buf.out = buffer[page++]; - - do { - if (stream->buf.in_pos == stream->buf.in_size && k < b) { - avail = min(length, msblk->devblksize - offset); - length -= avail; - wait_on_buffer(bh[k]); - if (!buffer_uptodate(bh[k])) - goto release_mutex; - - stream->buf.in = bh[k]->b_data + offset; - stream->buf.in_size = avail; - stream->buf.in_pos = 0; - offset = 0; - } - - if (stream->buf.out_pos == stream->buf.out_size - && page < pages) { - stream->buf.out = buffer[page++]; - stream->buf.out_pos = 0; - total += PAGE_CACHE_SIZE; - } - - xz_err = xz_dec_run(stream->state, &stream->buf); - - if (stream->buf.in_pos == stream->buf.in_size && k < b) - put_bh(bh[k++]); - } while (xz_err == XZ_OK); - - if (xz_err != XZ_STREAM_END) { - ERROR("xz_dec_run error, data probably corrupt\n"); - goto release_mutex; - } - - if (k < b) { - ERROR("xz_uncompress error, input remaining\n"); - goto release_mutex; - } - - total += stream->buf.out_pos; - mutex_unlock(&msblk->read_data_mutex); - return total; - -release_mutex: - mutex_unlock(&msblk->read_data_mutex); - - for (; k < b; k++) - put_bh(bh[k]); - - return -EIO; -} - -const struct squashfs_decompressor squashfs_xz_comp_ops = { - .init = squashfs_xz_init, - .free = squashfs_xz_free, - .decompress = squashfs_xz_uncompress, - .id = XZ_COMPRESSION, - .name = "xz", - .supported = 1 -}; |