michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "mozilla/dom/TextEncoder.h"
michael@0: #include "mozilla/dom/EncodingUtils.h"
michael@0: #include "nsContentUtils.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace dom {
michael@0: 
michael@0: void
michael@0: TextEncoder::Init(const nsAString& aEncoding, ErrorResult& aRv)
michael@0: {
michael@0:   nsAutoString label(aEncoding);
michael@0:   EncodingUtils::TrimSpaceCharacters(label);
michael@0: 
michael@0:   // Let encoding be the result of getting an encoding from label.
michael@0:   // If encoding is failure, or is none of utf-8, utf-16, and utf-16be,
michael@0:   // throw a TypeError.
michael@0:   if (!EncodingUtils::FindEncodingForLabel(label, mEncoding)) {
michael@0:     aRv.ThrowTypeError(MSG_ENCODING_NOT_SUPPORTED, &label);
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   if (!mEncoding.EqualsLiteral("UTF-8") &&
michael@0:       !mEncoding.EqualsLiteral("UTF-16LE") &&
michael@0:       !mEncoding.EqualsLiteral("UTF-16BE")) {
michael@0:     aRv.ThrowTypeError(MSG_DOM_ENCODING_NOT_UTF);
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   // Create an encoder object for mEncoding.
michael@0:   mEncoder = EncodingUtils::EncoderForEncoding(mEncoding);
michael@0: }
michael@0: 
michael@0: void
michael@0: TextEncoder::Encode(JSContext* aCx,
michael@0:                     JS::Handle<JSObject*> aObj,
michael@0:                     const nsAString& aString,
michael@0:                     const bool aStream,
michael@0: 		    JS::MutableHandle<JSObject*> aRetval,
michael@0:                     ErrorResult& aRv)
michael@0: {
michael@0:   // Run the steps of the encoding algorithm.
michael@0:   int32_t srcLen = aString.Length();
michael@0:   int32_t maxLen;
michael@0:   const char16_t* data = PromiseFlatString(aString).get();
michael@0:   nsresult rv = mEncoder->GetMaxLength(data, srcLen, &maxLen);
michael@0:   if (NS_FAILED(rv)) {
michael@0:     aRv.Throw(rv);
michael@0:     return;
michael@0:   }
michael@0:   // Need a fallible allocator because the caller may be a content
michael@0:   // and the content can specify the length of the string.
michael@0:   static const fallible_t fallible = fallible_t();
michael@0:   nsAutoArrayPtr<char> buf(new (fallible) char[maxLen + 1]);
michael@0:   if (!buf) {
michael@0:     aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
michael@0:     return;
michael@0:   }
michael@0: 
michael@0:   int32_t dstLen = maxLen;
michael@0:   rv = mEncoder->Convert(data, &srcLen, buf, &dstLen);
michael@0: 
michael@0:   // If the internal streaming flag is not set, then reset
michael@0:   // the encoding algorithm state to the default values for encoding.
michael@0:   if (!aStream) {
michael@0:     int32_t finishLen = maxLen - dstLen;
michael@0:     rv = mEncoder->Finish(buf + dstLen, &finishLen);
michael@0:     if (NS_SUCCEEDED(rv)) {
michael@0:       dstLen += finishLen;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   JSObject* outView = nullptr;
michael@0:   if (NS_SUCCEEDED(rv)) {
michael@0:     buf[dstLen] = '\0';
michael@0:     JSAutoCompartment ac(aCx, aObj);
michael@0:     outView = Uint8Array::Create(aCx, dstLen,
michael@0:                                  reinterpret_cast<uint8_t*>(buf.get()));
michael@0:     if (!outView) {
michael@0:       aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
michael@0:       return;
michael@0:     }
michael@0:   }
michael@0: 
michael@0:   if (NS_FAILED(rv)) {
michael@0:     aRv.Throw(rv);
michael@0:   }
michael@0:   aRetval.set(outView);
michael@0: }
michael@0: 
michael@0: void
michael@0: TextEncoder::GetEncoding(nsAString& aEncoding)
michael@0: {
michael@0:   CopyASCIItoUTF16(mEncoding, aEncoding);
michael@0:   nsContentUtils::ASCIIToLower(aEncoding);
michael@0: }
michael@0: 
michael@0: } // dom
michael@0: } // mozilla