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// SPDX-License-Identifier: GPL-2.0+
#include "decompress.h"
#if IS_ENABLED(CONFIG_LZ4)
#include <u-boot/lz4.h>
static int z_erofs_decompress_lz4(struct z_erofs_decompress_req *rq)
{
int ret = 0;
char *dest = rq->out;
char *src = rq->in;
char *buff = NULL;
bool support_0padding = false;
unsigned int inputmargin = 0;
if (erofs_sb_has_lz4_0padding()) {
support_0padding = true;
while (!src[inputmargin & (erofs_blksiz() - 1)])
if (!(++inputmargin & (erofs_blksiz() - 1)))
break;
if (inputmargin >= rq->inputsize)
return -EIO;
}
if (rq->decodedskip) {
buff = malloc(rq->decodedlength);
if (!buff)
return -ENOMEM;
dest = buff;
}
if (rq->partial_decoding || !support_0padding)
ret = LZ4_decompress_safe_partial(src + inputmargin, dest,
rq->inputsize - inputmargin,
rq->decodedlength, rq->decodedlength);
else
ret = LZ4_decompress_safe(src + inputmargin, dest,
rq->inputsize - inputmargin,
rq->decodedlength);
if (ret != (int)rq->decodedlength) {
erofs_err("failed to %s decompress %d in[%u, %u] out[%u]",
rq->partial_decoding ? "partial" : "full",
ret, rq->inputsize, inputmargin, rq->decodedlength);
ret = -EIO;
goto out;
}
if (rq->decodedskip)
memcpy(rq->out, dest + rq->decodedskip,
rq->decodedlength - rq->decodedskip);
out:
if (buff)
free(buff);
return ret;
}
#endif
int z_erofs_decompress(struct z_erofs_decompress_req *rq)
{
if (rq->alg == Z_EROFS_COMPRESSION_INTERLACED) {
unsigned int count, rightpart, skip;
/* XXX: should support inputsize >= erofs_blksiz() later */
if (rq->inputsize > erofs_blksiz())
return -EFSCORRUPTED;
if (rq->decodedlength > erofs_blksiz())
return -EFSCORRUPTED;
if (rq->decodedlength < rq->decodedskip)
return -EFSCORRUPTED;
count = rq->decodedlength - rq->decodedskip;
skip = erofs_blkoff(rq->interlaced_offset + rq->decodedskip);
rightpart = min(erofs_blksiz() - skip, count);
memcpy(rq->out, rq->in + skip, rightpart);
memcpy(rq->out + rightpart, rq->in, count - rightpart);
return 0;
} else if (rq->alg == Z_EROFS_COMPRESSION_SHIFTED) {
if (rq->decodedlength > rq->inputsize)
return -EFSCORRUPTED;
DBG_BUGON(rq->decodedlength < rq->decodedskip);
memcpy(rq->out, rq->in + rq->decodedskip,
rq->decodedlength - rq->decodedskip);
return 0;
}
#if IS_ENABLED(CONFIG_LZ4)
if (rq->alg == Z_EROFS_COMPRESSION_LZ4)
return z_erofs_decompress_lz4(rq);
#endif
return -EOPNOTSUPP;
}
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