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58968bd127
- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md).
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.
-------------------
- Add NCZBLOCK (nsz -B / .xcz) reader: each read decodes only the covered blocks and re-encrypts CTR sections, no disk output.
- Allow installing solid .nsz to NAND via DecompressNCZForInstall (lazy, incremental decode with frontier, O(n) instead of O(n^2)).
- Accept BKTR updates with thousands of sections (MaxSectionCount = 0x10000).
- Wire .nsz/.xcz into loader, registered cache, scanner, and NAND install (content_manager.h), and reject solid NCZ from the game list.
- Bump the pinned zstd to 33618c8 in cpmfile.json, which includes the upstream AArch64 revert ([33618c89](33618c89e5)) for a ZSTD_decodeSequence branch optimization that could corrupt data on ARM64; without it, solid NCZ decoding on Android fails with "Data corruption detected".
NCZ format and CTR counter semantics follow the reference nsz tool and its
Rust port:
- https://github.com/nicoboss/nsz (Decompressor.py, BlockDecompressorReader.py)
- https://docs.rs/nsz-rs/0.3.0/src/nsz_rs/decompress.rs.html
The last-block edge case (decompressed size is an exact multiple of block
size) is handled as described in https://github.com/nicoboss/nsz/issues/210
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4552
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: Shinmegumi <shinmegumi@eden-emu.dev>
59 lines
2 KiB
C++
59 lines
2 KiB
C++
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2019 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <span>
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#include <vector>
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#include "common/common_types.h"
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namespace Common::Compression {
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/**
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* Compresses a source memory region with Zstandard and returns the compressed data in a vector.
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*
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* @param source The uncompressed source memory region.
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* @param source_size The size of the uncompressed source memory region.
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* @param compression_level The used compression level. Should be between 1 and 22.
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*
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* @return the compressed data.
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*/
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[[nodiscard]] std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size,
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s32 compression_level);
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/**
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* Compresses a source memory region with Zstandard with the default compression level and returns
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* the compressed data in a vector.
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*
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* @param source The uncompressed source memory region.
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* @param source_size The size of the uncompressed source memory region.
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*
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* @return the compressed data.
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*/
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[[nodiscard]] std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size);
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/**
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* Decompresses a source memory region with Zstandard and returns the uncompressed data in a vector.
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*
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* @param compressed the compressed source memory region.
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*
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* @return the decompressed data.
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*/
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[[nodiscard]] std::vector<u8> DecompressDataZSTD(std::span<const u8> compressed);
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/**
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* Decompresses a single Zstandard frame into a caller-provided buffer of known size.
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*
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* @param compressed the compressed source memory region.
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* @param output the destination buffer. Its size is the maximum number of bytes to write.
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*
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* @return the number of bytes written, or 0 if the frame is invalid or doesn't fit. An empty
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* frame also returns 0.
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*/
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[[nodiscard]] std::size_t DecompressDataZSTD(std::span<const u8> compressed, std::span<u8> output);
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} // namespace Common::Compression
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