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author | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
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committer | Matt A. Tobin <mattatobin@localhost.localdomain> | 2018-02-02 04:16:08 -0500 |
commit | 5f8de423f190bbb79a62f804151bc24824fa32d8 (patch) | |
tree | 10027f336435511475e392454359edea8e25895d /toolkit/components/protobuf/src/google/protobuf/io/gzip_stream.h | |
parent | 49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff) | |
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Add m-esr52 at 52.6.0
Diffstat (limited to 'toolkit/components/protobuf/src/google/protobuf/io/gzip_stream.h')
-rw-r--r-- | toolkit/components/protobuf/src/google/protobuf/io/gzip_stream.h | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/toolkit/components/protobuf/src/google/protobuf/io/gzip_stream.h b/toolkit/components/protobuf/src/google/protobuf/io/gzip_stream.h new file mode 100644 index 000000000..c7ccc260d --- /dev/null +++ b/toolkit/components/protobuf/src/google/protobuf/io/gzip_stream.h @@ -0,0 +1,209 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// Author: brianolson@google.com (Brian Olson) +// +// This file contains the definition for classes GzipInputStream and +// GzipOutputStream. +// +// GzipInputStream decompresses data from an underlying +// ZeroCopyInputStream and provides the decompressed data as a +// ZeroCopyInputStream. +// +// GzipOutputStream is an ZeroCopyOutputStream that compresses data to +// an underlying ZeroCopyOutputStream. + +#ifndef GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__ +#define GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__ + +#include <zlib.h> + +#include <google/protobuf/stubs/common.h> +#include <google/protobuf/io/zero_copy_stream.h> + +namespace google { +namespace protobuf { +namespace io { + +// A ZeroCopyInputStream that reads compressed data through zlib +class LIBPROTOBUF_EXPORT GzipInputStream : public ZeroCopyInputStream { + public: + // Format key for constructor + enum Format { + // zlib will autodetect gzip header or deflate stream + AUTO = 0, + + // GZIP streams have some extra header data for file attributes. + GZIP = 1, + + // Simpler zlib stream format. + ZLIB = 2, + }; + + // buffer_size and format may be -1 for default of 64kB and GZIP format + explicit GzipInputStream( + ZeroCopyInputStream* sub_stream, + Format format = AUTO, + int buffer_size = -1); + virtual ~GzipInputStream(); + + // Return last error message or NULL if no error. + inline const char* ZlibErrorMessage() const { + return zcontext_.msg; + } + inline int ZlibErrorCode() const { + return zerror_; + } + + // implements ZeroCopyInputStream ---------------------------------- + bool Next(const void** data, int* size); + void BackUp(int count); + bool Skip(int count); + int64 ByteCount() const; + + private: + Format format_; + + ZeroCopyInputStream* sub_stream_; + + z_stream zcontext_; + int zerror_; + + void* output_buffer_; + void* output_position_; + size_t output_buffer_length_; + + int Inflate(int flush); + void DoNextOutput(const void** data, int* size); + + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GzipInputStream); +}; + + +class LIBPROTOBUF_EXPORT GzipOutputStream : public ZeroCopyOutputStream { + public: + // Format key for constructor + enum Format { + // GZIP streams have some extra header data for file attributes. + GZIP = 1, + + // Simpler zlib stream format. + ZLIB = 2, + }; + + struct Options { + // Defaults to GZIP. + Format format; + + // What size buffer to use internally. Defaults to 64kB. + int buffer_size; + + // A number between 0 and 9, where 0 is no compression and 9 is best + // compression. Defaults to Z_DEFAULT_COMPRESSION (see zlib.h). + int compression_level; + + // Defaults to Z_DEFAULT_STRATEGY. Can also be set to Z_FILTERED, + // Z_HUFFMAN_ONLY, or Z_RLE. See the documentation for deflateInit2 in + // zlib.h for definitions of these constants. + int compression_strategy; + + Options(); // Initializes with default values. + }; + + // Create a GzipOutputStream with default options. + explicit GzipOutputStream(ZeroCopyOutputStream* sub_stream); + + // Create a GzipOutputStream with the given options. + GzipOutputStream( + ZeroCopyOutputStream* sub_stream, + const Options& options); + + virtual ~GzipOutputStream(); + + // Return last error message or NULL if no error. + inline const char* ZlibErrorMessage() const { + return zcontext_.msg; + } + inline int ZlibErrorCode() const { + return zerror_; + } + + // Flushes data written so far to zipped data in the underlying stream. + // It is the caller's responsibility to flush the underlying stream if + // necessary. + // Compression may be less efficient stopping and starting around flushes. + // Returns true if no error. + // + // Please ensure that block size is > 6. Here is an excerpt from the zlib + // doc that explains why: + // + // In the case of a Z_FULL_FLUSH or Z_SYNC_FLUSH, make sure that avail_out + // is greater than six to avoid repeated flush markers due to + // avail_out == 0 on return. + bool Flush(); + + // Writes out all data and closes the gzip stream. + // It is the caller's responsibility to close the underlying stream if + // necessary. + // Returns true if no error. + bool Close(); + + // implements ZeroCopyOutputStream --------------------------------- + bool Next(void** data, int* size); + void BackUp(int count); + int64 ByteCount() const; + + private: + ZeroCopyOutputStream* sub_stream_; + // Result from calling Next() on sub_stream_ + void* sub_data_; + int sub_data_size_; + + z_stream zcontext_; + int zerror_; + void* input_buffer_; + size_t input_buffer_length_; + + // Shared constructor code. + void Init(ZeroCopyOutputStream* sub_stream, const Options& options); + + // Do some compression. + // Takes zlib flush mode. + // Returns zlib error code. + int Deflate(int flush); + + GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(GzipOutputStream); +}; + +} // namespace io +} // namespace protobuf + +} // namespace google +#endif // GOOGLE_PROTOBUF_IO_GZIP_STREAM_H__ |