third_party/WebKit/Source/platform/text/TextEncodingDetector.cpp

/*
 * Copyright (C) 2008, 2009 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#include "platform/text/TextEncodingDetector.h"

#include "third_party/ced/src/compact_enc_det/compact_enc_det.h"
#include "wtf/text/TextEncoding.h"

namespace blink {

bool detectTextEncoding(const char* data, size_t length,
    const char* hintEncodingName, WTF::TextEncoding* detectedEncoding)
{
    *detectedEncoding = WTF::TextEncoding();
    int consumedBytes;
    bool isReliable;
    Encoding encoding = CompactEncDet::DetectEncoding(
        data, length, nullptr, nullptr, nullptr,
        EncodingNameAliasToEncoding(hintEncodingName),
        UNKNOWN_LANGUAGE,
        CompactEncDet::WEB_CORPUS,
        false, // Include 7-bit encodings
        &consumedBytes,
        &isReliable);
    if (encoding != UNKNOWN_ENCODING) {
        *detectedEncoding = WTF::TextEncoding(MimeEncodingName(encoding));
        return true;
    }
    return false;
}

} // namespace blink