1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/encoding/TextDecoder.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,106 @@
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/TextDecoder.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 +static const char16_t kReplacementChar = static_cast<char16_t>(0xFFFD);
1.16 +
1.17 +void
1.18 +TextDecoder::Init(const nsAString& aLabel, const bool aFatal,
1.19 + ErrorResult& aRv)
1.20 +{
1.21 + nsAutoString label(aLabel);
1.22 + EncodingUtils::TrimSpaceCharacters(label);
1.23 +
1.24 + nsAutoCString encoding;
1.25 + // Let encoding be the result of getting an encoding from label.
1.26 + // If encoding is failure or replacement, throw a TypeError.
1.27 + if (!EncodingUtils::FindEncodingForLabel(label, encoding) ||
1.28 + encoding.EqualsLiteral("replacement")) {
1.29 + aRv.ThrowTypeError(MSG_ENCODING_NOT_SUPPORTED, &label);
1.30 + return;
1.31 + }
1.32 + InitWithEncoding(encoding, aFatal);
1.33 +}
1.34 +
1.35 +void
1.36 +TextDecoder::InitWithEncoding(const nsACString& aEncoding, const bool aFatal)
1.37 +{
1.38 + mEncoding = aEncoding;
1.39 + // If the constructor is called with an options argument,
1.40 + // and the fatal property of the dictionary is set,
1.41 + // set the internal fatal flag of the decoder object.
1.42 + mFatal = aFatal;
1.43 +
1.44 + // Create a decoder object for mEncoding.
1.45 + mDecoder = EncodingUtils::DecoderForEncoding(mEncoding);
1.46 +
1.47 + if (mFatal) {
1.48 + mDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Signal);
1.49 + }
1.50 +}
1.51 +
1.52 +void
1.53 +TextDecoder::Decode(const char* aInput, const int32_t aLength,
1.54 + const bool aStream, nsAString& aOutDecodedString,
1.55 + ErrorResult& aRv)
1.56 +{
1.57 + aOutDecodedString.Truncate();
1.58 +
1.59 + // Run or resume the decoder algorithm of the decoder object's encoder.
1.60 + int32_t outLen;
1.61 + nsresult rv = mDecoder->GetMaxLength(aInput, aLength, &outLen);
1.62 + if (NS_FAILED(rv)) {
1.63 + aRv.Throw(rv);
1.64 + return;
1.65 + }
1.66 + // Need a fallible allocator because the caller may be a content
1.67 + // and the content can specify the length of the string.
1.68 + static const fallible_t fallible = fallible_t();
1.69 + nsAutoArrayPtr<char16_t> buf(new (fallible) char16_t[outLen + 1]);
1.70 + if (!buf) {
1.71 + aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
1.72 + return;
1.73 + }
1.74 +
1.75 + int32_t length = aLength;
1.76 + rv = mDecoder->Convert(aInput, &length, buf, &outLen);
1.77 + MOZ_ASSERT(mFatal || rv != NS_ERROR_ILLEGAL_INPUT);
1.78 + buf[outLen] = 0;
1.79 + aOutDecodedString.Append(buf, outLen);
1.80 +
1.81 + // If the internal streaming flag of the decoder object is not set,
1.82 + // then reset the encoding algorithm state to the default values
1.83 + if (!aStream) {
1.84 + mDecoder->Reset();
1.85 + if (rv == NS_OK_UDEC_MOREINPUT) {
1.86 + if (mFatal) {
1.87 + aRv.Throw(NS_ERROR_DOM_ENCODING_DECODE_ERR);
1.88 + } else {
1.89 + // Need to emit a decode error manually
1.90 + // to simulate the EOF handling of the Encoding spec.
1.91 + aOutDecodedString.Append(kReplacementChar);
1.92 + }
1.93 + }
1.94 + }
1.95 +
1.96 + if (NS_FAILED(rv)) {
1.97 + aRv.Throw(NS_ERROR_DOM_ENCODING_DECODE_ERR);
1.98 + }
1.99 +}
1.100 +
1.101 +void
1.102 +TextDecoder::GetEncoding(nsAString& aEncoding)
1.103 +{
1.104 + CopyASCIItoUTF16(mEncoding, aEncoding);
1.105 + nsContentUtils::ASCIIToLower(aEncoding);
1.106 +}
1.107 +
1.108 +} // dom
1.109 +} // mozilla
