67 lines
2.7 KiB
C++
67 lines
2.7 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/FileSystem.h>
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namespace WebCore {
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// All methods are synchronous.
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class FileStream {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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FileStream();
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~FileStream();
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// Gets the size of a file. Also validates if the file has been changed or not if the expected modification time is provided, i.e. non-zero.
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// Returns total number of bytes if successful. -1 otherwise.
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long long getSize(const String& path, std::optional<WallTime> expectedModificationTime);
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// Opens a file for reading. The reading starts at the specified offset and lasts till the specified length.
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// Returns true on success. False otherwise.
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bool openForRead(const String& path, long long offset, long long length);
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// Closes the file.
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void close();
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// Reads a file into the provided data buffer.
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// Returns number of bytes being read on success. -1 otherwise.
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// If 0 is returned, it means that the reading is completed.
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int read(void* buffer, int length);
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private:
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FileSystem::PlatformFileHandle m_handle;
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long long m_bytesProcessed;
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long long m_totalBytesToRead;
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};
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} // namespace WebCore
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