Blob* File::slice(long long start,
long long end,
const String& contentType,
ExceptionState& exceptionState) const {
if (isClosed()) {
exceptionState.throwDOMException(InvalidStateError,
"File has been closed.");
return nullptr;
}
if (!m_hasBackingFile)
return Blob::slice(start, end, contentType, exceptionState);
// FIXME: This involves synchronous file operation. We need to figure out how
// to make it asynchronous.
long long size;
double modificationTimeMS;
captureSnapshot(size, modificationTimeMS);
clampSliceOffsets(size, start, end);
long long length = end - start;
std::unique_ptr<BlobData> blobData = BlobData::create();
blobData->setContentType(contentType);
if (!m_fileSystemURL.isEmpty()) {
blobData->appendFileSystemURL(m_fileSystemURL, start, length,
modificationTimeMS / msPerSecond);
} else {
ASSERT(!m_path.isEmpty());
blobData->appendFile(m_path, start, length,
modificationTimeMS / msPerSecond);
}
return Blob::create(BlobDataHandle::create(std::move(blobData), length));
}
Blob* Blob::slice(long long start, long long end, const String& contentType, ExceptionState& exceptionState) const
{
if (hasBeenClosed()) {
exceptionState.throwDOMException(InvalidStateError, "Blob has been closed.");
return nullptr;
}
long long size = this->size();
clampSliceOffsets(size, start, end);
long long length = end - start;
OwnPtr<BlobData> blobData = BlobData::create();
blobData->setContentType(contentType);
blobData->appendBlob(m_blobDataHandle, start, length);
return Blob::create(BlobDataHandle::create(blobData.release(), length));
}
