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94d0a2efc0
The existing zstd API requires the same sequence of calls to perform its task. Create a helper for U-Boot, to avoid code duplication, as is done with other compression algorithms. Make use of of this from the image code. Note that the zstd code lacks a test in test/compression.c and this should be added by the maintainer. Signed-off-by: Simon Glass <sjg@chromium.org>
65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2021 Google LLC
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*/
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#define LOG_CATEGORY LOGC_BOOT
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#include <common.h>
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#include <abuf.h>
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#include <log.h>
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#include <malloc.h>
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#include <linux/zstd.h>
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int zstd_decompress(struct abuf *in, struct abuf *out)
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{
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ZSTD_DStream *dstream;
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ZSTD_inBuffer in_buf;
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ZSTD_outBuffer out_buf;
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void *workspace;
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size_t wsize;
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int ret;
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wsize = ZSTD_DStreamWorkspaceBound(abuf_size(in));
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workspace = malloc(wsize);
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if (!workspace) {
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debug("%s: cannot allocate workspace of size %zu\n", __func__,
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wsize);
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return -ENOMEM;
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}
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dstream = ZSTD_initDStream(abuf_size(in), workspace, wsize);
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if (!dstream) {
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log_err("%s: ZSTD_initDStream failed\n", __func__);
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ret = -EPERM;
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goto do_free;
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}
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in_buf.src = abuf_data(in);
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in_buf.pos = 0;
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in_buf.size = abuf_size(in);
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out_buf.dst = abuf_data(out);
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out_buf.pos = 0;
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out_buf.size = abuf_size(out);
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while (1) {
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size_t res;
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res = ZSTD_decompressStream(dstream, &out_buf, &in_buf);
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if (ZSTD_isError(res)) {
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ret = ZSTD_getErrorCode(res);
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log_err("ZSTD_decompressStream error %d\n", ret);
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goto do_free;
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}
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if (in_buf.pos >= abuf_size(in) || !res)
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break;
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}
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ret = out_buf.pos;
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do_free:
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free(workspace);
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return ret;
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}
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