am f78eb27c: Merge "Refactoring checkAndPrepareWriting." into lmp-dev
* commit 'f78eb27c7e563d0bbe10239ec7d9941fd170e597': Refactoring checkAndPrepareWriting.main
commit
16665da280
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@ -107,27 +107,37 @@ bool BufferWithExtendableBuffer::extendBuffer() {
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}
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bool BufferWithExtendableBuffer::checkAndPrepareWriting(const int pos, const int size) {
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if (isInAdditionalBuffer(pos)) {
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const int tailPosition = getTailPosition();
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if (pos == tailPosition) {
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// Append data to the tail.
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if (pos + size > static_cast<int>(mAdditionalBuffer.size()) + mOriginalBufferSize) {
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// Need to extend buffer.
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if (!extendBuffer()) {
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if (pos < 0 || size < 0) {
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// Invalid position or size.
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return false;
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}
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const size_t totalRequiredSize = static_cast<size_t>(pos + size);
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if (!isInAdditionalBuffer(pos)) {
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// Here don't need to care about the additional buffer.
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if (static_cast<size_t>(mOriginalBufferSize) < totalRequiredSize) {
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// Violate the boundary.
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return false;
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}
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// The buffer has sufficient capacity.
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return true;
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}
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// Hereafter, pos is in the additional buffer.
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const size_t tailPosition = static_cast<size_t>(getTailPosition());
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if (totalRequiredSize <= tailPosition) {
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// The buffer has sufficient capacity.
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return true;
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}
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if (static_cast<size_t>(pos) != tailPosition) {
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// The additional buffer must be extended from the tail position.
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return false;
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}
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const size_t extendSize = totalRequiredSize -
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std::min(mAdditionalBuffer.size() + mOriginalBufferSize, totalRequiredSize);
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if (extendSize > 0 && !extendBuffer()) {
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// Failed to extend the buffer.
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return false;
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}
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mUsedAdditionalBufferSize += size;
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} else if (pos + size > tailPosition) {
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// The access will beyond the tail of used region.
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return false;
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}
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} else {
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if (pos < 0 || mOriginalBufferSize < pos + size) {
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// Invalid position or violate the boundary.
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return false;
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}
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}
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return true;
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}
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