The Tor Browser / file comparison
comparison: dom/encoding/TextDecoder.cpp
dom/encoding/TextDecoder.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
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| -1:000000000000 | 0:fab56f9ca1d7 |
|---|---|
| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 #include "mozilla/dom/TextDecoder.h" | |
| 6 #include "mozilla/dom/EncodingUtils.h" | |
| 7 #include "nsContentUtils.h" | |
| 8 | |
| 9 namespace mozilla { | |
| 10 namespace dom { | |
| 11 | |
| 12 static const char16_t kReplacementChar = static_cast<char16_t>(0xFFFD); | |
| 13 | |
| 14 void | |
| 15 TextDecoder::Init(const nsAString& aLabel, const bool aFatal, | |
| 16 ErrorResult& aRv) | |
| 17 { | |
| 18 nsAutoString label(aLabel); | |
| 19 EncodingUtils::TrimSpaceCharacters(label); | |
| 20 | |
| 21 nsAutoCString encoding; | |
| 22 // Let encoding be the result of getting an encoding from label. | |
| 23 // If encoding is failure or replacement, throw a TypeError. | |
| 24 if (!EncodingUtils::FindEncodingForLabel(label, encoding) || | |
| 25 encoding.EqualsLiteral("replacement")) { | |
| 26 aRv.ThrowTypeError(MSG_ENCODING_NOT_SUPPORTED, &label); | |
| 27 return; | |
| 28 } | |
| 29 InitWithEncoding(encoding, aFatal); | |
| 30 } | |
| 31 | |
| 32 void | |
| 33 TextDecoder::InitWithEncoding(const nsACString& aEncoding, const bool aFatal) | |
| 34 { | |
| 35 mEncoding = aEncoding; | |
| 36 // If the constructor is called with an options argument, | |
| 37 // and the fatal property of the dictionary is set, | |
| 38 // set the internal fatal flag of the decoder object. | |
| 39 mFatal = aFatal; | |
| 40 | |
| 41 // Create a decoder object for mEncoding. | |
| 42 mDecoder = EncodingUtils::DecoderForEncoding(mEncoding); | |
| 43 | |
| 44 if (mFatal) { | |
| 45 mDecoder->SetInputErrorBehavior(nsIUnicodeDecoder::kOnError_Signal); | |
| 46 } | |
| 47 } | |
| 48 | |
| 49 void | |
| 50 TextDecoder::Decode(const char* aInput, const int32_t aLength, | |
| 51 const bool aStream, nsAString& aOutDecodedString, | |
| 52 ErrorResult& aRv) | |
| 53 { | |
| 54 aOutDecodedString.Truncate(); | |
| 55 | |
| 56 // Run or resume the decoder algorithm of the decoder object's encoder. | |
| 57 int32_t outLen; | |
| 58 nsresult rv = mDecoder->GetMaxLength(aInput, aLength, &outLen); | |
| 59 if (NS_FAILED(rv)) { | |
| 60 aRv.Throw(rv); | |
| 61 return; | |
| 62 } | |
| 63 // Need a fallible allocator because the caller may be a content | |
| 64 // and the content can specify the length of the string. | |
| 65 static const fallible_t fallible = fallible_t(); | |
| 66 nsAutoArrayPtr<char16_t> buf(new (fallible) char16_t[outLen + 1]); | |
| 67 if (!buf) { | |
| 68 aRv.Throw(NS_ERROR_OUT_OF_MEMORY); | |
| 69 return; | |
| 70 } | |
| 71 | |
| 72 int32_t length = aLength; | |
| 73 rv = mDecoder->Convert(aInput, &length, buf, &outLen); | |
| 74 MOZ_ASSERT(mFatal || rv != NS_ERROR_ILLEGAL_INPUT); | |
| 75 buf[outLen] = 0; | |
| 76 aOutDecodedString.Append(buf, outLen); | |
| 77 | |
| 78 // If the internal streaming flag of the decoder object is not set, | |
| 79 // then reset the encoding algorithm state to the default values | |
| 80 if (!aStream) { | |
| 81 mDecoder->Reset(); | |
| 82 if (rv == NS_OK_UDEC_MOREINPUT) { | |
| 83 if (mFatal) { | |
| 84 aRv.Throw(NS_ERROR_DOM_ENCODING_DECODE_ERR); | |
| 85 } else { | |
| 86 // Need to emit a decode error manually | |
| 87 // to simulate the EOF handling of the Encoding spec. | |
| 88 aOutDecodedString.Append(kReplacementChar); | |
| 89 } | |
| 90 } | |
| 91 } | |
| 92 | |
| 93 if (NS_FAILED(rv)) { | |
| 94 aRv.Throw(NS_ERROR_DOM_ENCODING_DECODE_ERR); | |
| 95 } | |
| 96 } | |
| 97 | |
| 98 void | |
| 99 TextDecoder::GetEncoding(nsAString& aEncoding) | |
| 100 { | |
| 101 CopyASCIItoUTF16(mEncoding, aEncoding); | |
| 102 nsContentUtils::ASCIIToLower(aEncoding); | |
| 103 } | |
| 104 | |
| 105 } // dom | |
| 106 } // mozilla |
