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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Bootlin
*
* Author: Joao Marcos Costa <joaomarcos.costa@bootlin.com>
*/
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#if IS_ENABLED(CONFIG_LZO)
#include <linux/lzo.h>
#endif
#if IS_ENABLED(CONFIG_ZLIB)
#include <u-boot/zlib.h>
#endif
#if IS_ENABLED(CONFIG_ZSTD)
#include <linux/zstd.h>
#endif
#include "sqfs_decompressor.h"
#include "sqfs_utils.h"
int sqfs_decompressor_init(struct squashfs_ctxt *ctxt)
{
u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
switch (comp_type) {
#if IS_ENABLED(CONFIG_LZO)
case SQFS_COMP_LZO:
break;
#endif
#if IS_ENABLED(CONFIG_ZLIB)
case SQFS_COMP_ZLIB:
break;
#endif
#if IS_ENABLED(CONFIG_ZSTD)
case SQFS_COMP_ZSTD:
ctxt->zstd_workspace = malloc(zstd_dctx_workspace_bound());
if (!ctxt->zstd_workspace)
return -ENOMEM;
break;
#endif
default:
printf("Error: unknown compression type.\n");
return -EINVAL;
}
return 0;
}
void sqfs_decompressor_cleanup(struct squashfs_ctxt *ctxt)
{
u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
switch (comp_type) {
#if IS_ENABLED(CONFIG_LZO)
case SQFS_COMP_LZO:
break;
#endif
#if IS_ENABLED(CONFIG_ZLIB)
case SQFS_COMP_ZLIB:
break;
#endif
#if IS_ENABLED(CONFIG_ZSTD)
case SQFS_COMP_ZSTD:
free(ctxt->zstd_workspace);
break;
#endif
}
}
#if IS_ENABLED(CONFIG_ZLIB)
static void zlib_decompression_status(int ret)
{
switch (ret) {
case Z_BUF_ERROR:
printf("Error: 'dest' buffer is not large enough.\n");
break;
case Z_DATA_ERROR:
printf("Error: corrupted compressed data.\n");
break;
case Z_MEM_ERROR:
printf("Error: insufficient memory.\n");
break;
}
}
#endif
#if IS_ENABLED(CONFIG_ZSTD)
static int sqfs_zstd_decompress(struct squashfs_ctxt *ctxt, void *dest,
unsigned long dest_len, void *source, u32 src_len)
{
ZSTD_DCtx *ctx;
size_t wsize;
int ret;
wsize = zstd_dctx_workspace_bound();
ctx = zstd_init_dctx(ctxt->zstd_workspace, wsize);
if (!ctx)
return -EINVAL;
ret = zstd_decompress_dctx(ctx, dest, dest_len, source, src_len);
return zstd_is_error(ret);
}
#endif /* CONFIG_ZSTD */
int sqfs_decompress(struct squashfs_ctxt *ctxt, void *dest,
unsigned long *dest_len, void *source, u32 src_len)
{
u16 comp_type = get_unaligned_le16(&ctxt->sblk->compression);
int ret = 0;
switch (comp_type) {
#if IS_ENABLED(CONFIG_LZO)
case SQFS_COMP_LZO: {
size_t lzo_dest_len = *dest_len;
ret = lzo1x_decompress_safe(source, src_len, dest, &lzo_dest_len);
if (ret) {
printf("LZO decompression failed. Error code: %d\n", ret);
return -EINVAL;
}
break;
}
#endif
#if IS_ENABLED(CONFIG_ZLIB)
case SQFS_COMP_ZLIB:
ret = uncompress(dest, dest_len, source, src_len);
if (ret) {
zlib_decompression_status(ret);
return -EINVAL;
}
break;
#endif
#if IS_ENABLED(CONFIG_ZSTD)
case SQFS_COMP_ZSTD:
ret = sqfs_zstd_decompress(ctxt, dest, *dest_len, source, src_len);
if (ret) {
printf("ZSTD Error code: %d\n", zstd_get_error_code(ret));
return -EINVAL;
}
break;
#endif
default:
printf("Error: unknown compression type.\n");
return -EINVAL;
}
return ret;
}
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