3a21e92fc2
This patch updates erofs driver code to catch up with the latest code of erofs_utils (commit e4939f9eaa177e05d697ace85d8dc283e25dc2ed). LZMA will be supported in the separate patch later. Signed-off-by: Yifan Zhao <zhaoyifan@sjtu.edu.cn> Reviewed-by: Huang Jianan <jnhuang95@gmail.com>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include "decompress.h"
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#if IS_ENABLED(CONFIG_LZ4)
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#include <u-boot/lz4.h>
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static int z_erofs_decompress_lz4(struct z_erofs_decompress_req *rq)
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{
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int ret = 0;
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char *dest = rq->out;
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char *src = rq->in;
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char *buff = NULL;
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bool support_0padding = false;
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unsigned int inputmargin = 0;
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if (erofs_sb_has_lz4_0padding()) {
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support_0padding = true;
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while (!src[inputmargin & (erofs_blksiz() - 1)])
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if (!(++inputmargin & (erofs_blksiz() - 1)))
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break;
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if (inputmargin >= rq->inputsize)
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return -EIO;
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}
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if (rq->decodedskip) {
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buff = malloc(rq->decodedlength);
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if (!buff)
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return -ENOMEM;
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dest = buff;
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}
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if (rq->partial_decoding || !support_0padding)
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ret = LZ4_decompress_safe_partial(src + inputmargin, dest,
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rq->inputsize - inputmargin,
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rq->decodedlength, rq->decodedlength);
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else
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ret = LZ4_decompress_safe(src + inputmargin, dest,
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rq->inputsize - inputmargin,
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rq->decodedlength);
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if (ret != (int)rq->decodedlength) {
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erofs_err("failed to %s decompress %d in[%u, %u] out[%u]",
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rq->partial_decoding ? "partial" : "full",
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ret, rq->inputsize, inputmargin, rq->decodedlength);
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ret = -EIO;
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goto out;
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}
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if (rq->decodedskip)
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memcpy(rq->out, dest + rq->decodedskip,
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rq->decodedlength - rq->decodedskip);
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out:
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if (buff)
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free(buff);
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return ret;
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}
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#endif
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int z_erofs_decompress(struct z_erofs_decompress_req *rq)
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{
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if (rq->alg == Z_EROFS_COMPRESSION_INTERLACED) {
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unsigned int count, rightpart, skip;
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/* XXX: should support inputsize >= erofs_blksiz() later */
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if (rq->inputsize > erofs_blksiz())
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return -EFSCORRUPTED;
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if (rq->decodedlength > erofs_blksiz())
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return -EFSCORRUPTED;
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if (rq->decodedlength < rq->decodedskip)
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return -EFSCORRUPTED;
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count = rq->decodedlength - rq->decodedskip;
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skip = erofs_blkoff(rq->interlaced_offset + rq->decodedskip);
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rightpart = min(erofs_blksiz() - skip, count);
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memcpy(rq->out, rq->in + skip, rightpart);
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memcpy(rq->out + rightpart, rq->in, count - rightpart);
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return 0;
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} else if (rq->alg == Z_EROFS_COMPRESSION_SHIFTED) {
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if (rq->decodedlength > rq->inputsize)
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return -EFSCORRUPTED;
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DBG_BUGON(rq->decodedlength < rq->decodedskip);
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memcpy(rq->out, rq->in + rq->decodedskip,
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rq->decodedlength - rq->decodedskip);
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return 0;
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}
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#if IS_ENABLED(CONFIG_LZ4)
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if (rq->alg == Z_EROFS_COMPRESSION_LZ4)
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return z_erofs_decompress_lz4(rq);
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#endif
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return -EOPNOTSUPP;
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}
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