void
FileReaderSync::ReadAsBinaryString(File& aBlob,
nsAString& aResult,
ErrorResult& aRv)
{
nsCOMPtr<nsIInputStream> stream;
nsresult rv = aBlob.GetInternalStream(getter_AddRefs(stream));
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
uint32_t numRead;
do {
char readBuf[4096];
rv = stream->Read(readBuf, sizeof(readBuf), &numRead);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
uint32_t oldLength = aResult.Length();
AppendASCIItoUTF16(Substring(readBuf, readBuf + numRead), aResult);
if (aResult.Length() - oldLength != numRead) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
} while (numRead > 0);
}
void
FileReaderSync::ReadAsDataURL(File& aBlob, nsAString& aResult,
ErrorResult& aRv)
{
nsAutoString scratchResult;
scratchResult.AssignLiteral("data:");
nsString contentType;
aBlob.GetType(contentType);
if (contentType.IsEmpty()) {
scratchResult.AppendLiteral("application/octet-stream");
} else {
scratchResult.Append(contentType);
}
scratchResult.AppendLiteral(";base64,");
nsCOMPtr<nsIInputStream> stream;
nsresult rv = aBlob.GetInternalStream(getter_AddRefs(stream));
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
uint64_t size;
rv = aBlob.GetSize(&size);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
nsCOMPtr<nsIInputStream> bufferedStream;
rv = NS_NewBufferedInputStream(getter_AddRefs(bufferedStream), stream, size);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
nsAutoString encodedData;
rv = Base64EncodeInputStream(bufferedStream, encodedData, size);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
scratchResult.Append(encodedData);
aResult = scratchResult;
}
void
FileReaderSync::ReadAsArrayBuffer(JSContext* aCx,
JS::Handle<JSObject*> aScopeObj,
File& aBlob,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv)
{
uint64_t blobSize;
nsresult rv = aBlob.GetSize(&blobSize);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
UniquePtr<char[], JS::FreePolicy> bufferData(js_pod_malloc<char>(blobSize));
if (!bufferData) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
nsCOMPtr<nsIInputStream> stream;
rv = aBlob.GetInternalStream(getter_AddRefs(stream));
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
uint32_t numRead;
rv = stream->Read(bufferData.get(), blobSize, &numRead);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
NS_ASSERTION(numRead == blobSize, "failed to read data");
JSObject* arrayBuffer = JS_NewArrayBufferWithContents(aCx, blobSize, bufferData.get());
if (!arrayBuffer) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
bufferData.release();
aRetval.set(arrayBuffer);
}
void
FileReaderSync::ReadAsText(File& aBlob,
const Optional<nsAString>& aEncoding,
nsAString& aResult,
ErrorResult& aRv)
{
nsCOMPtr<nsIInputStream> stream;
nsresult rv = aBlob.GetInternalStream(getter_AddRefs(stream));
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
nsAutoCString encoding;
unsigned char sniffBuf[3] = { 0, 0, 0 };
uint32_t numRead;
rv = stream->Read(reinterpret_cast<char*>(sniffBuf),
sizeof(sniffBuf), &numRead);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
// The BOM sniffing is baked into the "decode" part of the Encoding
// Standard, which the File API references.
if (!nsContentUtils::CheckForBOM(sniffBuf, numRead, encoding)) {
// BOM sniffing failed. Try the API argument.
if (!aEncoding.WasPassed() ||
!EncodingUtils::FindEncodingForLabel(aEncoding.Value(),
encoding)) {
// API argument failed. Try the type property of the blob.
nsAutoString type16;
aBlob.GetType(type16);
NS_ConvertUTF16toUTF8 type(type16);
nsAutoCString specifiedCharset;
bool haveCharset;
int32_t charsetStart, charsetEnd;
NS_ExtractCharsetFromContentType(type,
specifiedCharset,
&haveCharset,
&charsetStart,
&charsetEnd);
if (!EncodingUtils::FindEncodingForLabel(specifiedCharset, encoding)) {
// Type property failed. Use UTF-8.
encoding.AssignLiteral("UTF-8");
}
}
}
nsCOMPtr<nsISeekableStream> seekable = do_QueryInterface(stream);
if (!seekable) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
// Seek to 0 because to undo the BOM sniffing advance. UTF-8 and UTF-16
// decoders will swallow the BOM.
rv = seekable->Seek(nsISeekableStream::NS_SEEK_SET, 0);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
rv = ConvertStream(stream, encoding.get(), aResult);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return;
}
}