muduo之GzipFile

GzipFile封装了gzip的一些API，记录一下

// Use of this source code is governed by a BSD-style license
// that can be found in the License file.
//
// Author: Shuo Chen (chenshuo at chenshuo dot com)#pragma once#include "muduo/base/StringPiece.h"
#include "muduo/base/noncopyable.h"
#include <zlib.h>namespace muduo
{class GzipFile : noncopyable
{public:GzipFile(GzipFile&& rhs) noexcept: file_(rhs.file_){rhs.file_ = NULL;}~GzipFile(){if (file_){::gzclose(file_);}}GzipFile& operator=(GzipFile&& rhs) noexcept{swap(rhs);return *this;}bool valid() const { return file_ != NULL; }void swap(GzipFile& rhs) { std::swap(file_, rhs.file_); }
#if ZLIB_VERNUM >= 0x1240bool setBuffer(int size) { return ::gzbuffer(file_, size) == 0; }
#endif// return the number of uncompressed bytes actually read, 0 for eof, -1 for errorint read(void* buf, int len) { return ::gzread(file_, buf, len); }// return the number of uncompressed bytes actually writtenint write(StringPiece buf) { return ::gzwrite(file_, buf.data(), buf.size()); }// number of uncompressed bytesoff_t tell() const { return ::gztell(file_); }#if ZLIB_VERNUM >= 0x1240// number of compressed bytesoff_t offset() const { return ::gzoffset(file_); }
#endif// int flush(int f) { return ::gzflush(file_, f); }static GzipFile openForRead(StringArg filename){return GzipFile(::gzopen(filename.c_str(), "rbe"));}static GzipFile openForAppend(StringArg filename){return GzipFile(::gzopen(filename.c_str(), "abe"));}static GzipFile openForWriteExclusive(StringArg filename){return GzipFile(::gzopen(filename.c_str(), "wbxe"));}static GzipFile openForWriteTruncate(StringArg filename){return GzipFile(::gzopen(filename.c_str(), "wbe"));}private:explicit GzipFile(gzFile file): file_(file){}gzFile file_;
};}  // namespace muduo

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