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/*
* Copyright (C) 2007 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``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 APPLE COMPUTER, INC. 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, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_UTF8_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_UTF8_H_
#include "base/containers/span.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_uchar.h"
#include "third_party/blink/renderer/platform/wtf/wtf_export.h"
namespace WTF {
namespace unicode {
typedef enum {
kConversionOK, // conversion successful
kSourceExhausted, // partial character in source, but hit end
kTargetExhausted, // insuff. room in target for conversion
kSourceIllegal // source sequence is illegal/malformed
} ConversionStatus;
template <typename CharType>
struct ConversionResult {
base::span<const CharType> converted;
size_t consumed;
ConversionStatus status;
};
// These conversion functions take a "strict" argument. When this flag is set to
// true (i.e. strict), both irregular sequences and isolated surrogates will
// cause an error. When the flag is set to false (i.e. lenient), both irregular
// sequences and isolated surrogates are converted.
//
// Whether the flag is strict or lenient, all illegal sequences will cause an
// error return. This includes sequences such as: <F4 90 80 80>, <C0 80>, or
// <A0> in UTF-8, and values above 0x10FFFF in UTF-32. Conformant code must
// check for illegal sequences.
//
// When the flag is set to lenient, characters over 0x10FFFF are converted to
// the replacement character; otherwise (when the flag is set to strict) they
// constitute an error.
// TODO(crbug.com/329702346): It is not clear how characters over 0x10FFFF can
// be represented in the encodings that these functions claim to handle. In
// UTF-16, surrogate pairs should not be able to encode codepoints higher than
// 0x10FFFF; in UTF-8, the 4-byte form is similarly unable to encode codepoints
// higher than 0x10FFFF.
WTF_EXPORT ConversionResult<UChar> ConvertUTF8ToUTF16(
base::span<const uint8_t> source,
base::span<UChar> target,
bool strict = true);
WTF_EXPORT ConversionResult<uint8_t> ConvertLatin1ToUTF8(
base::span<const LChar> source,
base::span<uint8_t> target);
WTF_EXPORT ConversionResult<uint8_t> ConvertUTF16ToUTF8(
base::span<const UChar> source,
base::span<uint8_t> target,
bool strict = true);
// Returns the number of UTF-16 code points.
WTF_EXPORT unsigned CalculateStringLengthFromUTF8(const uint8_t* data,
const uint8_t*& data_end,
bool& seen_non_ascii,
bool& seen_non_latin1);
} // namespace unicode
} // namespace WTF
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_UTF8_H_
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