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120 lines
2.5 KiB
120 lines
2.5 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) 2010 LG Electronics |
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* Chan Jeong <[email protected]> |
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* |
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* lzo_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/vmalloc.h> |
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#include <linux/lzo.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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struct squashfs_lzo { |
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void *input; |
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void *output; |
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}; |
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static void *lzo_init(struct squashfs_sb_info *msblk, void *buff) |
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{ |
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int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); |
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struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL); |
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if (stream == NULL) |
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goto failed; |
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stream->input = vmalloc(block_size); |
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if (stream->input == NULL) |
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goto failed; |
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stream->output = vmalloc(block_size); |
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if (stream->output == NULL) |
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goto failed2; |
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return stream; |
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failed2: |
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vfree(stream->input); |
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failed: |
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ERROR("Failed to allocate lzo 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 lzo_free(void *strm) |
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{ |
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struct squashfs_lzo *stream = strm; |
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if (stream) { |
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vfree(stream->input); |
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vfree(stream->output); |
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} |
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kfree(stream); |
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} |
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static int lzo_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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struct squashfs_lzo *stream = strm; |
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void *buff = stream->input, *data; |
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int bytes = length, res; |
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size_t out_len = output->length; |
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while (bio_next_segment(bio, &iter_all)) { |
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int avail = min(bytes, ((int)bvec->bv_len) - offset); |
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data = page_address(bvec->bv_page) + bvec->bv_offset; |
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memcpy(buff, data + offset, avail); |
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buff += avail; |
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bytes -= avail; |
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offset = 0; |
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} |
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res = lzo1x_decompress_safe(stream->input, (size_t)length, |
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stream->output, &out_len); |
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if (res != LZO_E_OK) |
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goto failed; |
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res = bytes = (int)out_len; |
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data = squashfs_first_page(output); |
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buff = stream->output; |
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while (data) { |
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if (bytes <= PAGE_SIZE) { |
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memcpy(data, buff, bytes); |
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break; |
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} else { |
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memcpy(data, buff, PAGE_SIZE); |
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buff += PAGE_SIZE; |
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bytes -= PAGE_SIZE; |
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data = squashfs_next_page(output); |
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} |
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} |
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squashfs_finish_page(output); |
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return res; |
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failed: |
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return -EIO; |
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} |
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const struct squashfs_decompressor squashfs_lzo_comp_ops = { |
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.init = lzo_init, |
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.free = lzo_free, |
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.decompress = lzo_uncompress, |
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.id = LZO_COMPRESSION, |
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.name = "lzo", |
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.supported = 1 |
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};
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