67 lines
1.4 KiB
C++
67 lines
1.4 KiB
C++
/*
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* Copyright 2005-2009, Ingo Weinhold, ingo_weinhold@gmx.de.
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* Copyright 2016, Axel Dörfler, axeld@pinc-software.de.
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* Distributed under the terms of the MIT License.
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*/
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#include "AttributeUtilities.h"
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#include <fs_attr.h>
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#include <Node.h>
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#include <StorageDefs.h>
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static const int kCopyBufferSize = 64 * 1024;
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// 64 KB
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namespace BPrivate {
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status_t
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CopyAttributes(BNode& source, BNode& destination)
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{
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char attrName[B_ATTR_NAME_LENGTH];
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while (source.GetNextAttrName(attrName) == B_OK) {
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// get attr info
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attr_info attrInfo;
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status_t status = source.GetAttrInfo(attrName, &attrInfo);
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if (status != B_OK)
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return status;
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// copy the attribute
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char buffer[kCopyBufferSize];
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off_t offset = 0;
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off_t bytesLeft = attrInfo.size;
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// Go at least once through the loop, so that an empty attribute will be
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// created as well
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do {
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size_t toRead = kCopyBufferSize;
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if ((off_t)toRead > bytesLeft)
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toRead = bytesLeft;
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// read
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ssize_t bytesRead = source.ReadAttr(attrName, attrInfo.type,
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offset, buffer, toRead);
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if (bytesRead < 0)
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return bytesRead;
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// write
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ssize_t bytesWritten = destination.WriteAttr(attrName,
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attrInfo.type, offset, buffer, bytesRead);
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if (bytesWritten < 0)
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return bytesWritten;
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bytesLeft -= bytesRead;
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offset += bytesRead;
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} while (bytesLeft > 0);
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}
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return B_OK;
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}
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} // namespace BPrivate
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