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The structure is identical to the existing compressor implementations, trivially adding lz4 decompression to sqfs_decompress. The changes were tested using a sandbox build. An LZ4 compressed squashfs image was bound as a host block device. Signed-off-by: David Oberhollenzer <goliath@infraroot.at> Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
182 lines
3.5 KiB
C
182 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2020 Bootlin
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*
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* Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
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*/
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#include <errno.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#if IS_ENABLED(CONFIG_LZO)
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#include <linux/lzo.h>
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#endif
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#if IS_ENABLED(CONFIG_ZLIB)
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#include <u-boot/zlib.h>
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#endif
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#if IS_ENABLED(CONFIG_LZ4)
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#include <u-boot/lz4.h>
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#endif
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#if IS_ENABLED(CONFIG_ZSTD)
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#include <linux/zstd.h>
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#endif
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#include "sqfs_decompressor.h"
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#include "sqfs_utils.h"
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int sqfs_decompressor_init(struct squashfs_ctxt *ctxt)
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{
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u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
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switch (comp_type) {
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#if IS_ENABLED(CONFIG_LZO)
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case SQFS_COMP_LZO:
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break;
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#endif
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#if IS_ENABLED(CONFIG_ZLIB)
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case SQFS_COMP_ZLIB:
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break;
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#endif
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#if IS_ENABLED(CONFIG_LZ4)
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case SQFS_COMP_LZ4:
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break;
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#endif
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#if IS_ENABLED(CONFIG_ZSTD)
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case SQFS_COMP_ZSTD:
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ctxt->zstd_workspace = malloc(zstd_dctx_workspace_bound());
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if (!ctxt->zstd_workspace)
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return -ENOMEM;
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break;
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#endif
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default:
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printf("Error: unknown compression type.\n");
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return -EINVAL;
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}
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return 0;
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}
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void sqfs_decompressor_cleanup(struct squashfs_ctxt *ctxt)
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{
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u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
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switch (comp_type) {
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#if IS_ENABLED(CONFIG_LZO)
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case SQFS_COMP_LZO:
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break;
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#endif
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#if IS_ENABLED(CONFIG_ZLIB)
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case SQFS_COMP_ZLIB:
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break;
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#endif
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#if IS_ENABLED(CONFIG_LZ4)
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case SQFS_COMP_LZ4:
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break;
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#endif
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#if IS_ENABLED(CONFIG_ZSTD)
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case SQFS_COMP_ZSTD:
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free(ctxt->zstd_workspace);
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break;
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#endif
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}
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}
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#if IS_ENABLED(CONFIG_ZLIB)
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static void zlib_decompression_status(int ret)
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{
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switch (ret) {
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case Z_BUF_ERROR:
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printf("Error: 'dest' buffer is not large enough.\n");
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break;
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case Z_DATA_ERROR:
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printf("Error: corrupted compressed data.\n");
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break;
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case Z_MEM_ERROR:
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printf("Error: insufficient memory.\n");
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break;
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}
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}
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#endif
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#if IS_ENABLED(CONFIG_ZSTD)
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static int sqfs_zstd_decompress(struct squashfs_ctxt *ctxt, void *dest,
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unsigned long dest_len, void *source, u32 src_len)
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{
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ZSTD_DCtx *ctx;
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size_t wsize;
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int ret;
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wsize = zstd_dctx_workspace_bound();
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ctx = zstd_init_dctx(ctxt->zstd_workspace, wsize);
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if (!ctx)
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return -EINVAL;
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ret = zstd_decompress_dctx(ctx, dest, dest_len, source, src_len);
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return zstd_is_error(ret);
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}
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#endif /* CONFIG_ZSTD */
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int sqfs_decompress(struct squashfs_ctxt *ctxt, void *dest,
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unsigned long *dest_len, void *source, u32 src_len)
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{
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u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
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int ret = 0;
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switch (comp_type) {
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#if IS_ENABLED(CONFIG_LZO)
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case SQFS_COMP_LZO: {
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size_t lzo_dest_len = *dest_len;
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ret = lzo1x_decompress_safe(source, src_len, dest, &lzo_dest_len);
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if (ret) {
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printf("LZO decompression failed. Error code: %d\n", ret);
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return -EINVAL;
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}
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break;
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}
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#endif
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#if IS_ENABLED(CONFIG_ZLIB)
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case SQFS_COMP_ZLIB:
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ret = uncompress(dest, dest_len, source, src_len);
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if (ret) {
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zlib_decompression_status(ret);
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return -EINVAL;
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}
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break;
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#endif
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#if IS_ENABLED(CONFIG_LZ4)
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case SQFS_COMP_LZ4:
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ret = LZ4_decompress_safe(source, dest, src_len, *dest_len);
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if (ret < 0) {
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printf("LZ4 decompression failed.\n");
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return -EINVAL;
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}
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ret = 0;
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break;
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#endif
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#if IS_ENABLED(CONFIG_ZSTD)
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case SQFS_COMP_ZSTD:
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ret = sqfs_zstd_decompress(ctxt, dest, *dest_len, source, src_len);
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if (ret) {
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printf("ZSTD Error code: %d\n", zstd_get_error_code(ret));
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return -EINVAL;
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}
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break;
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#endif
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default:
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printf("Error: unknown compression type.\n");
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return -EINVAL;
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}
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return ret;
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}
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