110 lines
4.3 KiB
C++
110 lines
4.3 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "lz4.h"
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#define ZSTD_STATIC_LINKING_ONLY
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#define ZSTD_ZBIC_SUPPORT 1
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#include "zstd.h"
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namespace ams::util {
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/* Compression utilities. */
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int CompressLZ4(void *dst, size_t dst_size, const void *src, size_t src_size) {
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/* Size checks. */
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AMS_ABORT_UNLESS(dst_size <= std::numeric_limits<int>::max());
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AMS_ABORT_UNLESS(src_size <= std::numeric_limits<int>::max());
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/* This is just a thin wrapper around LZ4. */
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return LZ4_compress_default(reinterpret_cast<const char *>(src), reinterpret_cast<char *>(dst), static_cast<int>(src_size), static_cast<int>(dst_size));
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}
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size_t CompressZstd(void *dst, size_t dst_size, const void *src, size_t src_size) {
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/* Basic size checks. */
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AMS_ABORT_UNLESS(dst_size <= std::numeric_limits<int>::max());
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AMS_ABORT_UNLESS(src_size <= std::numeric_limits<int>::max());
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/* Additionally, we must check the compression boundary. */
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auto bound = ZSTD_compressBound(src_size);
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AMS_ABORT_UNLESS(!ZSTD_isError(bound));
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AMS_ABORT_UNLESS(dst_size >= bound);
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/* Use Zstd default level. */
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int compressionLevel = 3;
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/* This is just a wrapper around Zstd. */
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return ZSTD_compress(dst, dst_size, src, src_size, compressionLevel);
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}
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/* Decompression utilities. */
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int DecompressLZ4(void *dst, size_t dst_size, const void *src, size_t src_size) {
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/* Size checks. */
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AMS_ABORT_UNLESS(dst_size <= std::numeric_limits<int>::max());
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AMS_ABORT_UNLESS(src_size <= std::numeric_limits<int>::max());
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/* This is just a thin wrapper around LZ4. */
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return LZ4_decompress_safe(reinterpret_cast<const char *>(src), reinterpret_cast<char *>(dst), static_cast<int>(src_size), static_cast<int>(dst_size));
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}
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size_t DecompressZstd(void *dst, size_t dst_size, const void *src, size_t src_size) {
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/* Basic size checks. */
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AMS_ABORT_UNLESS(dst_size <= std::numeric_limits<int>::max());
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AMS_ABORT_UNLESS(src_size <= std::numeric_limits<int>::max());
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/* Additionally, we must check the decompression boundary. */
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auto bound = ZSTD_decompressBound(src, src_size);
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AMS_ABORT_UNLESS(!ZSTD_isError(bound));
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AMS_ABORT_UNLESS(dst_size >= bound);
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/* This is just a wrapper around Zstd. */
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return ZSTD_decompress(dst, dst_size, src, src_size);
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}
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bool DecompressZstdForLoader(void* workspace, size_t workspace_size, void *dst, size_t dst_size, size_t expected_dec_size, const void *src, size_t src_size) {
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/* Check decompression margin. */
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auto margin = ZSTD_decompressionMargin(src, src_size);
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if (ZSTD_isError(margin)) {
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return false;
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}
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/* Don't overflow from margin. */
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if (!util::CanAddWithoutOverflow(margin, expected_dec_size)) {
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return false;
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}
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/* Make sure we fit in the destination buffer. */
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if (margin + expected_dec_size > dst_size) {
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return false;
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}
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/* This is a runtime assert in Loader code. We replicate it here. */
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AMS_ABORT_UNLESS(ZSTD_estimateDCtxSize() == workspace_size);
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/* Decompress using a static decompression context. */
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auto dctx = ZSTD_initStaticDCtx(workspace, workspace_size);
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size_t dec_size = ZSTD_decompressDCtx(dctx, dst, dst_size, src, src_size);
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if (ZSTD_isError(dec_size)) {
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return false;
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}
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if (dec_size != expected_dec_size) {
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return false;
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}
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return true;
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}
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} |