1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/encoding/TextEncoder.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,102 @@
1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.7 +
1.8 +#include "mozilla/dom/TextEncoder.h"
1.9 +#include "mozilla/dom/EncodingUtils.h"
1.10 +#include "nsContentUtils.h"
1.11 +
1.12 +namespace mozilla {
1.13 +namespace dom {
1.14 +
1.15 +void
1.16 +TextEncoder::Init(const nsAString& aEncoding, ErrorResult& aRv)
1.17 +{
1.18 + nsAutoString label(aEncoding);
1.19 + EncodingUtils::TrimSpaceCharacters(label);
1.20 +
1.21 + // Let encoding be the result of getting an encoding from label.
1.22 + // If encoding is failure, or is none of utf-8, utf-16, and utf-16be,
1.23 + // throw a TypeError.
1.24 + if (!EncodingUtils::FindEncodingForLabel(label, mEncoding)) {
1.25 + aRv.ThrowTypeError(MSG_ENCODING_NOT_SUPPORTED, &label);
1.26 + return;
1.27 + }
1.28 +
1.29 + if (!mEncoding.EqualsLiteral("UTF-8") &&
1.30 + !mEncoding.EqualsLiteral("UTF-16LE") &&
1.31 + !mEncoding.EqualsLiteral("UTF-16BE")) {
1.32 + aRv.ThrowTypeError(MSG_DOM_ENCODING_NOT_UTF);
1.33 + return;
1.34 + }
1.35 +
1.36 + // Create an encoder object for mEncoding.
1.37 + mEncoder = EncodingUtils::EncoderForEncoding(mEncoding);
1.38 +}
1.39 +
1.40 +void
1.41 +TextEncoder::Encode(JSContext* aCx,
1.42 + JS::Handle<JSObject*> aObj,
1.43 + const nsAString& aString,
1.44 + const bool aStream,
1.45 + JS::MutableHandle<JSObject*> aRetval,
1.46 + ErrorResult& aRv)
1.47 +{
1.48 + // Run the steps of the encoding algorithm.
1.49 + int32_t srcLen = aString.Length();
1.50 + int32_t maxLen;
1.51 + const char16_t* data = PromiseFlatString(aString).get();
1.52 + nsresult rv = mEncoder->GetMaxLength(data, srcLen, &maxLen);
1.53 + if (NS_FAILED(rv)) {
1.54 + aRv.Throw(rv);
1.55 + return;
1.56 + }
1.57 + // Need a fallible allocator because the caller may be a content
1.58 + // and the content can specify the length of the string.
1.59 + static const fallible_t fallible = fallible_t();
1.60 + nsAutoArrayPtr<char> buf(new (fallible) char[maxLen + 1]);
1.61 + if (!buf) {
1.62 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.63 + return;
1.64 + }
1.65 +
1.66 + int32_t dstLen = maxLen;
1.67 + rv = mEncoder->Convert(data, &srcLen, buf, &dstLen);
1.68 +
1.69 + // If the internal streaming flag is not set, then reset
1.70 + // the encoding algorithm state to the default values for encoding.
1.71 + if (!aStream) {
1.72 + int32_t finishLen = maxLen - dstLen;
1.73 + rv = mEncoder->Finish(buf + dstLen, &finishLen);
1.74 + if (NS_SUCCEEDED(rv)) {
1.75 + dstLen += finishLen;
1.76 + }
1.77 + }
1.78 +
1.79 + JSObject* outView = nullptr;
1.80 + if (NS_SUCCEEDED(rv)) {
1.81 + buf[dstLen] = '\0';
1.82 + JSAutoCompartment ac(aCx, aObj);
1.83 + outView = Uint8Array::Create(aCx, dstLen,
1.84 + reinterpret_cast<uint8_t*>(buf.get()));
1.85 + if (!outView) {
1.86 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.87 + return;
1.88 + }
1.89 + }
1.90 +
1.91 + if (NS_FAILED(rv)) {
1.92 + aRv.Throw(rv);
1.93 + }
1.94 + aRetval.set(outView);
1.95 +}
1.96 +
1.97 +void
1.98 +TextEncoder::GetEncoding(nsAString& aEncoding)
1.99 +{
1.100 + CopyASCIItoUTF16(mEncoding, aEncoding);
1.101 + nsContentUtils::ASCIIToLower(aEncoding);
1.102 +}
1.103 +
1.104 +} // dom
1.105 +} // mozilla
