From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 19:32:43 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- xpcom/io/SnappyFrameUtils.h | 80 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 xpcom/io/SnappyFrameUtils.h (limited to 'xpcom/io/SnappyFrameUtils.h') diff --git a/xpcom/io/SnappyFrameUtils.h b/xpcom/io/SnappyFrameUtils.h new file mode 100644 index 0000000000..923994c661 --- /dev/null +++ b/xpcom/io/SnappyFrameUtils.h @@ -0,0 +1,80 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef mozilla_SnappyFrameUtils_h__ +#define mozilla_SnappyFrameUtils_h__ + +#include + +#include "mozilla/Attributes.h" +#include "nsError.h" + +namespace mozilla { +namespace detail { + +// +// Utility class providing primitives necessary to build streams based +// on the snappy compressor. This essentially abstracts the framing format +// defined in: +// +// other-licences/snappy/src/framing_format.txt +// +// NOTE: Currently only the StreamIdentifier and CompressedData chunks are +// supported. +// +class SnappyFrameUtils { + public: + enum ChunkType { + Unknown, + StreamIdentifier, + CompressedData, + UncompressedData, + Padding, + Reserved, + ChunkTypeCount + }; + + static const size_t kChunkTypeLength = 1; + static const size_t kChunkLengthLength = 3; + static const size_t kHeaderLength = kChunkTypeLength + kChunkLengthLength; + static const size_t kStreamIdentifierDataLength = 6; + static const size_t kCRCLength = 4; + + static nsresult WriteStreamIdentifier(char* aDest, size_t aDestLength, + size_t* aBytesWrittenOut); + + static nsresult WriteCompressedData(char* aDest, size_t aDestLength, + const char* aData, size_t aDataLength, + size_t* aBytesWrittenOut); + + static nsresult ParseHeader(const char* aSource, size_t aSourceLength, + ChunkType* aTypeOut, size_t* aDataLengthOut); + + static nsresult ParseData(char* aDest, size_t aDestLength, ChunkType aType, + const char* aData, size_t aDataLength, + size_t* aBytesWrittenOut, size_t* aBytesReadOut); + + static nsresult ParseStreamIdentifier(char* aDest, size_t aDestLength, + const char* aData, size_t aDataLength, + size_t* aBytesWrittenOut, + size_t* aBytesReadOut); + + static nsresult ParseCompressedData(char* aDest, size_t aDestLength, + const char* aData, size_t aDataLength, + size_t* aBytesWrittenOut, + size_t* aBytesReadOut); + + static size_t MaxCompressedBufferLength(size_t aSourceLength); + + protected: + SnappyFrameUtils() = default; + virtual ~SnappyFrameUtils() = default; +}; + +} // namespace detail +} // namespace mozilla + +#endif // mozilla_SnappyFrameUtils_h__ -- cgit v1.2.3