mirror of
https://github.com/juce-framework/JUCE.git
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90 lines
2.7 KiB
C++
90 lines
2.7 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2022 - Raw Material Software Limited
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 7 End-User License
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Agreement and JUCE Privacy Policy.
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End User License Agreement: www.juce.com/juce-7-licence
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Privacy Policy: www.juce.com/juce-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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namespace juce::build_tools
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{
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uint64 calculateStreamHashCode (InputStream& in)
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{
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uint64 t = 0;
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const int bufferSize = 4096;
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HeapBlock<uint8> buffer;
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buffer.malloc (bufferSize);
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for (;;)
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{
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auto num = in.read (buffer, bufferSize);
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if (num <= 0)
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break;
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for (int i = 0; i < num; ++i)
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t = t * 65599 + buffer[i];
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}
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return t;
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}
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uint64 calculateFileHashCode (const File& file)
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{
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std::unique_ptr<FileInputStream> stream (file.createInputStream());
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return stream != nullptr ? calculateStreamHashCode (*stream) : 0;
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}
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uint64 calculateMemoryHashCode (const void* data, size_t numBytes)
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{
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uint64 t = 0;
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for (size_t i = 0; i < numBytes; ++i)
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t = t * 65599 + static_cast<const uint8*> (data)[i];
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return t;
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}
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bool overwriteFileWithNewDataIfDifferent (const File& file, const void* data, size_t numBytes)
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{
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if (file.getSize() == (int64) numBytes
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&& calculateMemoryHashCode (data, numBytes) == calculateFileHashCode (file))
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return true;
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if (file.exists())
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return file.replaceWithData (data, numBytes);
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return file.getParentDirectory().createDirectory() && file.appendData (data, numBytes);
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}
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bool overwriteFileWithNewDataIfDifferent (const File& file, const MemoryOutputStream& newData)
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{
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return overwriteFileWithNewDataIfDifferent (file, newData.getData(), newData.getDataSize());
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}
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bool overwriteFileWithNewDataIfDifferent (const File& file, const String& newData)
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{
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const char* const utf8 = newData.toUTF8();
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return overwriteFileWithNewDataIfDifferent (file, utf8, strlen (utf8));
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}
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} // namespace juce::build_tools
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