79 lines
1.7 KiB
C
79 lines
1.7 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 & ~PAGE_MASK])
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if (!(++inputmargin & ~PAGE_MASK))
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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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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_SHIFTED) {
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if (rq->inputsize != EROFS_BLKSIZ)
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return -EFSCORRUPTED;
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DBG_BUGON(rq->decodedlength > EROFS_BLKSIZ);
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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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