void DataContainer::Allocate() {
// Check that memory has not been allocated
if (m_pAllocatedMemory != NULL) {
_EXCEPTIONT("Attempting Allocate() on attached DataContainer");
}
// Allocate memory as one contiguous chunk
size_t sTotalByteSize = GetTotalByteSize();
m_pAllocatedMemory =
reinterpret_cast<unsigned char*>(malloc(sTotalByteSize));
if (m_pAllocatedMemory == NULL) {
_EXCEPTIONT("Out of memory");
}
// Initialize allocated memory to zero
memset(m_pAllocatedMemory, 0, sTotalByteSize);
// Assign memory to DataChunks
unsigned char * pAccumulated = m_pAllocatedMemory;
for (size_t i = 0; i < m_vecDataChunks.size(); i++) {
DataChunk * pDataChunk =
reinterpret_cast<DataChunk*>(m_vecDataChunks[i]);
pDataChunk->AttachToData(
reinterpret_cast<void *>(pAccumulated));
#pragma message "Alignment may be an issue here on 32-bit systems"
pAccumulated += pDataChunk->GetByteSize();
}
}
size_t DataContainer::GetTotalByteSize() const {
// Get the accumulated size of all DataChunks
size_t sAccumulated = 0;
for (size_t i = 0; i < m_vecDataChunks.size(); i++) {
DataChunk * pDataChunk =
reinterpret_cast<DataChunk*>(m_vecDataChunks[i]);
// Verify byte alignment
size_t sByteSize = pDataChunk->GetByteSize();
if (sByteSize % sizeof(size_t) != 0) {
_EXCEPTIONT("Misaligned array detected in DataContainer");
}
sAccumulated += sByteSize;
}
return sAccumulated;
}
void DataContainer::AttachTo(
unsigned char * pAllocatedMemory
) {
if (m_pAllocatedMemory != NULL) {
_EXCEPTIONT("Attempting AttachTo() on attached DataContainer");
}
m_fOwnsData = false;
m_pAllocatedMemory = pAllocatedMemory;
// Assign memory to DataChunks
unsigned char * pAccumulated = m_pAllocatedMemory;
for (size_t i = 0; i < m_vecDataChunks.size(); i++) {
DataChunk * pDataChunk =
reinterpret_cast<DataChunk *>(m_vecDataChunks[i]);
pDataChunk->AttachToData(
reinterpret_cast<void *>(pAccumulated));
pAccumulated += pDataChunk->GetByteSize();
}
}