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142 lines
3.3 KiB
142 lines
3.3 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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* decompressor.c |
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*/ |
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#include <linux/types.h> |
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#include <linux/mutex.h> |
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#include <linux/slab.h> |
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#include <linux/buffer_head.h> |
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#include "squashfs_fs.h" |
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#include "squashfs_fs_sb.h" |
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#include "decompressor.h" |
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#include "squashfs.h" |
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#include "page_actor.h" |
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/* |
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* This file (and decompressor.h) implements a decompressor framework for |
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* Squashfs, allowing multiple decompressors to be easily supported |
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*/ |
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static const struct squashfs_decompressor squashfs_lzma_unsupported_comp_ops = { |
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NULL, NULL, NULL, NULL, LZMA_COMPRESSION, "lzma", 0 |
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}; |
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#ifndef CONFIG_SQUASHFS_LZ4 |
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static const struct squashfs_decompressor squashfs_lz4_comp_ops = { |
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NULL, NULL, NULL, NULL, LZ4_COMPRESSION, "lz4", 0 |
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}; |
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#endif |
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#ifndef CONFIG_SQUASHFS_LZO |
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static const struct squashfs_decompressor squashfs_lzo_comp_ops = { |
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NULL, NULL, NULL, NULL, LZO_COMPRESSION, "lzo", 0 |
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}; |
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#endif |
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#ifndef CONFIG_SQUASHFS_XZ |
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static const struct squashfs_decompressor squashfs_xz_comp_ops = { |
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NULL, NULL, NULL, NULL, XZ_COMPRESSION, "xz", 0 |
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}; |
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#endif |
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#ifndef CONFIG_SQUASHFS_ZLIB |
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static const struct squashfs_decompressor squashfs_zlib_comp_ops = { |
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NULL, NULL, NULL, NULL, ZLIB_COMPRESSION, "zlib", 0 |
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}; |
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#endif |
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#ifndef CONFIG_SQUASHFS_ZSTD |
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static const struct squashfs_decompressor squashfs_zstd_comp_ops = { |
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NULL, NULL, NULL, NULL, ZSTD_COMPRESSION, "zstd", 0 |
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}; |
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#endif |
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static const struct squashfs_decompressor squashfs_unknown_comp_ops = { |
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NULL, NULL, NULL, NULL, 0, "unknown", 0 |
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}; |
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static const struct squashfs_decompressor *decompressor[] = { |
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&squashfs_zlib_comp_ops, |
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&squashfs_lz4_comp_ops, |
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&squashfs_lzo_comp_ops, |
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&squashfs_xz_comp_ops, |
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&squashfs_lzma_unsupported_comp_ops, |
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&squashfs_zstd_comp_ops, |
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&squashfs_unknown_comp_ops |
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}; |
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const struct squashfs_decompressor *squashfs_lookup_decompressor(int id) |
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{ |
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int i; |
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for (i = 0; decompressor[i]->id; i++) |
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if (id == decompressor[i]->id) |
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break; |
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return decompressor[i]; |
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} |
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static void *get_comp_opts(struct super_block *sb, unsigned short flags) |
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{ |
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struct squashfs_sb_info *msblk = sb->s_fs_info; |
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void *buffer = NULL, *comp_opts; |
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struct squashfs_page_actor *actor = NULL; |
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int length = 0; |
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/* |
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* Read decompressor specific options from file system if present |
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*/ |
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if (SQUASHFS_COMP_OPTS(flags)) { |
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buffer = kmalloc(PAGE_SIZE, GFP_KERNEL); |
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if (buffer == NULL) { |
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comp_opts = ERR_PTR(-ENOMEM); |
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goto out; |
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} |
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actor = squashfs_page_actor_init(&buffer, 1, 0); |
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if (actor == NULL) { |
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comp_opts = ERR_PTR(-ENOMEM); |
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goto out; |
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} |
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length = squashfs_read_data(sb, |
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sizeof(struct squashfs_super_block), 0, NULL, actor); |
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if (length < 0) { |
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comp_opts = ERR_PTR(length); |
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goto out; |
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} |
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} |
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comp_opts = squashfs_comp_opts(msblk, buffer, length); |
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out: |
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kfree(actor); |
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kfree(buffer); |
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return comp_opts; |
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} |
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void *squashfs_decompressor_setup(struct super_block *sb, unsigned short flags) |
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{ |
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struct squashfs_sb_info *msblk = sb->s_fs_info; |
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void *stream, *comp_opts = get_comp_opts(sb, flags); |
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if (IS_ERR(comp_opts)) |
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return comp_opts; |
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stream = squashfs_decompressor_create(msblk, comp_opts); |
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if (IS_ERR(stream)) |
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kfree(comp_opts); |
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return stream; |
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}
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