ArrayBufferView.cpp [plain text]
#include "config.h"
#include "ArrayBufferView.h"
#include "ArrayBuffer.h"
namespace WebCore {
ArrayBufferView::ArrayBufferView(PassRefPtr<ArrayBuffer> buffer,
unsigned byteOffset)
: m_byteOffset(byteOffset)
, m_buffer(buffer)
{
m_baseAddress = m_buffer ? (static_cast<char*>(m_buffer->data()) + m_byteOffset) : 0;
}
ArrayBufferView::~ArrayBufferView()
{
}
void ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec)
{
if (byteOffset > byteLength()
|| byteOffset + array->byteLength() > byteLength()
|| byteOffset + array->byteLength() < byteOffset) {
ec = INDEX_SIZE_ERR;
return;
}
char* base = static_cast<char*>(baseAddress());
memmove(base + byteOffset, array->baseAddress(), array->byteLength());
}
void ArrayBufferView::setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset, ExceptionCode& ec)
{
if (byteOffset > byteLength()
|| byteOffset + dataByteLength > byteLength()
|| byteOffset + dataByteLength < byteOffset) {
ec = INDEX_SIZE_ERR;
return;
}
char* base = static_cast<char*>(baseAddress());
memmove(base + byteOffset, data, dataByteLength);
}
void ArrayBufferView::zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength, ExceptionCode& ec)
{
if (byteOffset > byteLength()
|| byteOffset + rangeByteLength > byteLength()
|| byteOffset + rangeByteLength < byteOffset) {
ec = INDEX_SIZE_ERR;
return;
}
char* base = static_cast<char*>(baseAddress());
memset(base + byteOffset, 0, rangeByteLength);
}
void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arraySize,
unsigned* offset, unsigned* length)
{
if (start < 0)
start += arraySize;
if (start < 0)
start = 0;
if (end < 0)
end += arraySize;
if (end < 0)
end = 0;
if (end < start)
end = start;
*offset = static_cast<unsigned>(start);
*length = static_cast<unsigned>(end - start);
}
}