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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/i18n/icu_encoding_detection.h"
#include "base/string_util.h"
#include "unicode/ucsdet.h"
namespace base {
// TODO(jungshik): We can apply more heuristics here (e.g. using various hints
// like TLD, the UI language/default encoding of a client, etc).
bool DetectEncoding(const std::string& text, std::string* encoding) {
if (IsStringASCII(text)) {
*encoding = std::string();
return true;
}
UErrorCode status = U_ZERO_ERROR;
UCharsetDetector* detector = ucsdet_open(&status);
ucsdet_setText(detector, text.data(), static_cast<int32_t>(text.length()),
&status);
// TODO(jungshik): Should we check the quality of the match? A rather
// arbitrary number is assigned by ICU and it's hard to come up with
// a lower limit.
const UCharsetMatch* match = ucsdet_detect(detector, &status);
const char* detected_encoding = ucsdet_getName(match, &status);
ucsdet_close(detector);
if (U_FAILURE(status))
return false;
*encoding = detected_encoding;
return true;
}
} // namespace base
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