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/*
* Copyright (C) 2004, 2006 Apple Computer, Inc. All rights reserved.
* Copyright (C) 2006 Alexey Proskuryakov <ap@nypop.com>
*
* 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_TEXT_CODEC_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_TEXT_CODEC_H_
#include <memory>
#include "base/notreached.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_uchar.h"
#include "third_party/blink/renderer/platform/wtf/wtf_size_t.h"
namespace WTF {
class TextEncoding;
// Specifies what will happen when a character is encountered that is
// not encodable in the character set.
enum UnencodableHandling {
// Encodes the character as an XML entity. For example, U+06DE
// would be "۞" (0x6DE = 1758 in octal).
kEntitiesForUnencodables,
// Encodes the character as en entity as above, but escaped
// non-alphanumeric characters. This is used in URLs.
// For example, U+6DE would be "%26%231758%3B".
kURLEncodedEntitiesForUnencodables,
// Encodes the character as a CSS entity. For example U+06DE
// would be \06de. See: https://www.w3.org/TR/css-syntax-3/#escaping
kCSSEncodedEntitiesForUnencodables,
// Used when all characters can be encoded in the character set. Only
// applicable to UTF-N encodings.
kNoUnencodables,
};
enum class FlushBehavior {
// More bytes are coming, don't flush the codec.
kDoNotFlush = 0,
// A fetch has hit EOF. Some codecs handle fetches differently, for compat
// reasons.
kFetchEOF,
// Do a full flush of the codec.
kDataEOF
};
class WTF_EXPORT TextCodec {
USING_FAST_MALLOC(TextCodec);
public:
TextCodec() = default;
TextCodec(const TextCodec&) = delete;
TextCodec& operator=(const TextCodec&) = delete;
virtual ~TextCodec();
struct EncodeIntoResult {
wtf_size_t code_units_read;
size_t bytes_written;
};
String Decode(base::span<const uint8_t> data,
FlushBehavior flush = FlushBehavior::kDoNotFlush) {
bool ignored;
return Decode(data, flush, false, ignored);
}
virtual String Decode(base::span<const uint8_t> data,
FlushBehavior,
bool stop_on_error,
bool& saw_error) = 0;
virtual std::string Encode(base::span<const UChar>, UnencodableHandling) = 0;
virtual std::string Encode(base::span<const LChar>, UnencodableHandling) = 0;
// EncodeInto is meant only to encode UTF8 bytes into an unsigned char*
// buffer; therefore this method is only usefully overridden by TextCodecUTF8.
virtual EncodeIntoResult EncodeInto(base::span<const LChar>,
base::span<uint8_t> destination) {
NOTREACHED();
}
virtual EncodeIntoResult EncodeInto(base::span<const UChar>,
base::span<uint8_t> destination) {
NOTREACHED();
}
static std::string GetUnencodableReplacement(UChar32 code_point,
UnencodableHandling);
};
typedef void (*EncodingNameRegistrar)(const char* alias, const char* name);
typedef std::unique_ptr<TextCodec> (
*NewTextCodecFunction)(const TextEncoding&, const void* additional_data);
typedef void (*TextCodecRegistrar)(const char* name,
NewTextCodecFunction,
const void* additional_data);
} // namespace WTF
using WTF::TextCodec;
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_WTF_TEXT_TEXT_CODEC_H_
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