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127 lines
2.6 KiB
127 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Squashfs - a compressed read only filesystem for Linux |
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* |
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* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
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* Phillip Lougher <[email protected]> |
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* |
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* zlib_wrapper.c |
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*/ |
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#include <linux/mutex.h> |
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#include <linux/bio.h> |
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#include <linux/slab.h> |
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#include <linux/zlib.h> |
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#include <linux/vmalloc.h> |
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#include "squashfs_fs.h" |
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#include "squashfs_fs_sb.h" |
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#include "squashfs.h" |
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#include "decompressor.h" |
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#include "page_actor.h" |
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static void *zlib_init(struct squashfs_sb_info *dummy, void *buff) |
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{ |
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z_stream *stream = kmalloc(sizeof(z_stream), GFP_KERNEL); |
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if (stream == NULL) |
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goto failed; |
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stream->workspace = vmalloc(zlib_inflate_workspacesize()); |
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if (stream->workspace == NULL) |
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goto failed; |
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return stream; |
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failed: |
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ERROR("Failed to allocate zlib workspace\n"); |
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kfree(stream); |
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return ERR_PTR(-ENOMEM); |
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} |
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static void zlib_free(void *strm) |
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{ |
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z_stream *stream = strm; |
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if (stream) |
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vfree(stream->workspace); |
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kfree(stream); |
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} |
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static int zlib_uncompress(struct squashfs_sb_info *msblk, void *strm, |
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struct bio *bio, int offset, int length, |
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struct squashfs_page_actor *output) |
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{ |
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struct bvec_iter_all iter_all = {}; |
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struct bio_vec *bvec = bvec_init_iter_all(&iter_all); |
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int zlib_init = 0, error = 0; |
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z_stream *stream = strm; |
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stream->avail_out = PAGE_SIZE; |
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stream->next_out = squashfs_first_page(output); |
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stream->avail_in = 0; |
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for (;;) { |
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int zlib_err; |
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if (stream->avail_in == 0) { |
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const void *data; |
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int avail; |
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if (!bio_next_segment(bio, &iter_all)) { |
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/* Z_STREAM_END must be reached. */ |
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error = -EIO; |
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break; |
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} |
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avail = min(length, ((int)bvec->bv_len) - offset); |
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data = page_address(bvec->bv_page) + bvec->bv_offset; |
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length -= avail; |
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stream->next_in = data + offset; |
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stream->avail_in = avail; |
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offset = 0; |
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} |
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if (stream->avail_out == 0) { |
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stream->next_out = squashfs_next_page(output); |
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if (stream->next_out != NULL) |
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stream->avail_out = PAGE_SIZE; |
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} |
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if (!zlib_init) { |
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zlib_err = zlib_inflateInit(stream); |
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if (zlib_err != Z_OK) { |
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error = -EIO; |
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break; |
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} |
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zlib_init = 1; |
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} |
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zlib_err = zlib_inflate(stream, Z_SYNC_FLUSH); |
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if (zlib_err == Z_STREAM_END) |
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break; |
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if (zlib_err != Z_OK) { |
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error = -EIO; |
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break; |
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} |
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} |
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squashfs_finish_page(output); |
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if (!error) |
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if (zlib_inflateEnd(stream) != Z_OK) |
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error = -EIO; |
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return error ? error : stream->total_out; |
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} |
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const struct squashfs_decompressor squashfs_zlib_comp_ops = { |
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.init = zlib_init, |
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.free = zlib_free, |
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.decompress = zlib_uncompress, |
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.id = ZLIB_COMPRESSION, |
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.name = "zlib", |
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.supported = 1 |
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}; |
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