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269520ee69
This is desirable so that we don't have to wake up disk if control file is not changed, and it is not have to be written again. We use the same method (SHA1 hash) to check the content is the same. The limitation is the hash is stored in memory, so we have to write the first time in each session. See GH-382
73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
/* <!-- copyright */
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/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2015 Tatsuhiro Tsujikawa
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for 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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#ifndef D_SHA1_IO_FILE_H
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#define D_SHA1_IO_FILE_H
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#include "IOFile.h"
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#include "MessageDigest.h"
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#include <memory>
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namespace aria2 {
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// Class to calculate SHA1 hash value for data written into this
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// object. No file I/O is done in this class.
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class SHA1IOFile : public IOFile {
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public:
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SHA1IOFile();
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std::string digest();
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protected:
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// Not implemented
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virtual size_t onRead(void* ptr, size_t count) CXX11_OVERRIDE;
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virtual size_t onWrite(const void* ptr, size_t count) CXX11_OVERRIDE;
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// Not implemented
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virtual char* onGets(char* s, int size) CXX11_OVERRIDE;
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virtual int onVprintf(const char* format, va_list va) CXX11_OVERRIDE;
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virtual int onFlush() CXX11_OVERRIDE;
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virtual int onClose() CXX11_OVERRIDE;
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virtual bool onSupportsColor() CXX11_OVERRIDE;
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virtual bool isError() const CXX11_OVERRIDE;
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virtual bool isEOF() const CXX11_OVERRIDE;
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virtual bool isOpen() const CXX11_OVERRIDE;
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private:
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std::unique_ptr<MessageDigest> sha1_;
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};
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} // namespace aria2
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#endif // D_SHA1_IO_FILE_H
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