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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2021 Google LLC
*/
#define LOG_CATEGORY LOGC_BOOT
#include <common.h>
#include <abuf.h>
#include <log.h>
#include <malloc.h>
#include <linux/zstd.h>
int zstd_decompress(struct abuf *in, struct abuf *out)
{
ZSTD_DStream *dstream;
ZSTD_inBuffer in_buf;
ZSTD_outBuffer out_buf;
void *workspace;
size_t wsize;
int ret;
wsize = ZSTD_DStreamWorkspaceBound(abuf_size(in));
workspace = malloc(wsize);
if (!workspace) {
debug("%s: cannot allocate workspace of size %zu\n", __func__,
wsize);
return -ENOMEM;
}
dstream = ZSTD_initDStream(abuf_size(in), workspace, wsize);
if (!dstream) {
log_err("%s: ZSTD_initDStream failed\n", __func__);
ret = -EPERM;
goto do_free;
}
in_buf.src = abuf_data(in);
in_buf.pos = 0;
in_buf.size = abuf_size(in);
out_buf.dst = abuf_data(out);
out_buf.pos = 0;
out_buf.size = abuf_size(out);
while (1) {
size_t res;
res = ZSTD_decompressStream(dstream, &out_buf, &in_buf);
if (ZSTD_isError(res)) {
ret = ZSTD_getErrorCode(res);
log_err("ZSTD_decompressStream error %d\n", ret);
goto do_free;
}
if (in_buf.pos >= abuf_size(in) || !res)
break;
}
ret = out_buf.pos;
do_free:
free(workspace);
return ret;
}
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