80 lines
3.1 KiB
C++
80 lines
3.1 KiB
C++
// *****************************************************************************
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// * This file is part of the FreeFileSync project. It is distributed under *
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// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
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// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
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// *****************************************************************************
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#include "binary.h"
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using namespace zen;
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using namespace fff;
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using AFS = AbstractFileSystem;
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bool fff::filesHaveSameContent(const AbstractPath& filePath1, const AbstractPath& filePath2, const IoCallback& notifyUnbufferedIO /*throw X*/) //throw FileError, X
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{
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int64_t totalBytesNotified = 0;
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IoCallback /*[!] as expected by InputStream::tryRead()*/ notifyIoDiv = IOCallbackDivider(notifyUnbufferedIO, totalBytesNotified);
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const std::unique_ptr<AFS::InputStream> stream1 = AFS::getInputStream(filePath1); //throw FileError
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const std::unique_ptr<AFS::InputStream> stream2 = AFS::getInputStream(filePath2); //
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const size_t blockSize1 = stream1->getBlockSize(); //throw FileError
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const size_t blockSize2 = stream2->getBlockSize(); //
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const size_t bufCapacity = blockSize2 - 1 + blockSize1 + blockSize2;
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const std::unique_ptr<std::byte[]> buf(new std::byte[bufCapacity]);
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std::byte* const buf1 = buf.get() + blockSize2; //capacity: blockSize2 - 1 + blockSize1
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std::byte* const buf2 = buf.get(); //capacity: blockSize2
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size_t buf1PosEnd = 0;
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for (;;)
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{
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const size_t bytesRead1 = stream1->tryRead(buf1 + buf1PosEnd, blockSize1, notifyIoDiv); //throw FileError, X; may return short; only 0 means EOF
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if (bytesRead1 == 0) //end of file
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{
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size_t buf1Pos = 0;
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while (buf1Pos < buf1PosEnd)
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{
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const size_t bytesRead2 = stream2->tryRead(buf2, blockSize2, notifyIoDiv); //throw FileError, X; may return short; only 0 means EOF
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if (bytesRead2 == 0 ||//end of file
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bytesRead2 > buf1PosEnd - buf1Pos)
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return false;
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if (std::memcmp(buf1 + buf1Pos, buf2, bytesRead2) != 0)
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return false;
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buf1Pos += bytesRead2;
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}
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return stream2->tryRead(buf2, blockSize2, notifyIoDiv) == 0; //throw FileError, X; expect EOF
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}
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else
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{
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buf1PosEnd += bytesRead1;
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size_t buf1Pos = 0;
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while (buf1PosEnd - buf1Pos >= blockSize2)
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{
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const size_t bytesRead2 = stream2->tryRead(buf2, blockSize2, notifyIoDiv); //throw FileError, X; may return short; only 0 means EOF
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if (bytesRead2 == 0) //end of file
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return false;
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if (std::memcmp(buf1 + buf1Pos, buf2, bytesRead2) != 0)
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return false;
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buf1Pos += bytesRead2;
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}
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if (buf1Pos > 0)
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{
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buf1PosEnd -= buf1Pos;
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std::memmove(buf1, buf1 + buf1Pos, buf1PosEnd);
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}
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}
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}
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}
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