Squashed 'external/gainput/' content from commit 2be0a50

git-subtree-dir: external/gainput
git-subtree-split: 2be0a50089eafcc6fccb66142180082e48f27f4c

lib/source/gainput/dev/GainputMemoryStream.cpp

@@ -0,0 +1,91 @@
+#include <gainput/gainput.h>
+
+#if defined(GAINPUT_DEV) || defined(GAINPUT_ENABLE_RECORDER)
+#include "GainputMemoryStream.h"
+
+namespace gainput {
+
+MemoryStream::MemoryStream(void* data, size_t length, size_t capacity, bool ownership) :
+	data_(data),
+	length_(length),
+	capacity_(capacity),
+	ownership_(ownership),
+	position_(0)
+{
+	// empty
+}
+
+MemoryStream::MemoryStream(size_t capacity, Allocator& allocator) :
+	allocator_(&allocator),
+	length_(0),
+	capacity_(capacity),
+	ownership_(true),
+	position_(0)
+{
+	data_ = this->allocator_->Allocate(capacity_);
+}
+
+MemoryStream::~MemoryStream()
+{
+	if (ownership_)
+	{
+		assert(allocator_);
+		allocator_->Deallocate(data_);
+	}
+}
+
+size_t
+MemoryStream::Read(void* dest, size_t readLength)
+{
+	assert(position_ + readLength <= length_);
+	memcpy(dest, (void*)( (uint8_t*)data_ + position_), readLength);
+	position_ += readLength;
+	return readLength;
+}
+
+size_t
+MemoryStream::Write(const void* src, size_t writeLength)
+{
+	assert(position_ + writeLength <= capacity_);
+	memcpy((void*)( (uint8_t*)data_ + position_), src, writeLength);
+	position_ += writeLength;
+	length_ += writeLength;
+	return writeLength;
+}
+
+bool
+MemoryStream::SeekBegin(int offset)
+{
+	if (offset < 0)
+	{
+		return false;
+	}
+	position_ = offset;
+	return true;
+}
+
+bool
+MemoryStream::SeekCurrent(int offset)
+{
+	if (offset + position_ > length_)
+	{
+		return false;
+	}
+	position_ += offset;
+	return true;
+}
+
+bool
+MemoryStream::SeekEnd(int offset)
+{
+	if (offset > 0)
+	{
+		return false;
+	}
+	position_ = length_ + offset;
+	return true;
+}
+
+}
+#endif
+