mirror of
https://github.com/VCMP-SqMod/SqMod.git
synced 2024-11-08 08:47:17 +01:00
4a6bfc086c
Switched to POCO library for unified platform/library interface. Deprecated the external module API. It was creating more problems than solving. Removed most built-in libraries in favor of system libraries for easier maintenance. Cleaned and secured code with help from static analyzers.
123 lines
3.9 KiB
C++
123 lines
3.9 KiB
C++
//
|
|
// DoubleByteEncoding.h
|
|
//
|
|
// Library: Encodings
|
|
// Package: Encodings
|
|
// Module: DoubleByteEncoding
|
|
//
|
|
// Definition of the DoubleByteEncoding class.
|
|
//
|
|
// Copyright (c) 2018, Applied Informatics Software Engineering GmbH.
|
|
// and Contributors.
|
|
//
|
|
// SPDX-License-Identifier: BSL-1.0
|
|
//
|
|
|
|
|
|
#ifndef Encodings_DoubleByteEncoding_INCLUDED
|
|
#define Encodings_DoubleByteEncoding_INCLUDED
|
|
|
|
|
|
#include "Poco/Encodings.h"
|
|
#include "Poco/TextEncoding.h"
|
|
|
|
|
|
namespace Poco {
|
|
|
|
|
|
class Encodings_API DoubleByteEncoding: public TextEncoding
|
|
/// This abstract class is a base class for various double-byte character
|
|
/// set (DBCS) encodings.
|
|
///
|
|
/// Double-byte encodings are variants of multi-byte encodings
|
|
/// where (Unicode) each code point is represented by one or
|
|
/// two bytes. Unicode code points are restricted to the
|
|
/// Basic Multilingual Plane.
|
|
///
|
|
/// Subclasses must provide encoding names, a static CharacterMap, as well
|
|
/// as static Mapping and reverse Mapping tables, and provide these to the
|
|
/// DoubleByteEncoding constructor.
|
|
{
|
|
public:
|
|
struct Mapping
|
|
{
|
|
Poco::UInt16 from;
|
|
Poco::UInt16 to;
|
|
};
|
|
|
|
// TextEncoding
|
|
const char* canonicalName() const;
|
|
bool isA(const std::string& encodingName) const;
|
|
const CharacterMap& characterMap() const;
|
|
int convert(const unsigned char* bytes) const;
|
|
int convert(int ch, unsigned char* bytes, int length) const;
|
|
int queryConvert(const unsigned char* bytes, int length) const;
|
|
int sequenceLength(const unsigned char* bytes, int length) const;
|
|
|
|
protected:
|
|
DoubleByteEncoding(const char** names, const TextEncoding::CharacterMap& charMap, const Mapping mappingTable[], std::size_t mappingTableSize, const Mapping reverseMappingTable[], std::size_t reverseMappingTableSize);
|
|
/// Creates a DoubleByteEncoding using the given mapping and reverse-mapping tables.
|
|
///
|
|
/// names must be a static array declared in the derived class,
|
|
/// containing the names of this encoding, declared as:
|
|
///
|
|
/// const char* MyEncoding::_names[] =
|
|
/// {
|
|
/// "myencoding",
|
|
/// "MyEncoding",
|
|
/// NULL
|
|
/// };
|
|
///
|
|
/// The first entry in names must be the canonical name.
|
|
///
|
|
/// charMap must be a static CharacterMap giving information about double-byte
|
|
/// character sequences.
|
|
///
|
|
/// For each mappingTable item, from must be a value in range 0x0100 to
|
|
// 0xFFFF for double-byte mappings, which the most significant (upper) byte
|
|
/// representing the first character in the sequence and the lower byte
|
|
/// representing the second character in the sequence.
|
|
///
|
|
/// For each reverseMappingTable item, from must be Unicode code point from the
|
|
/// Basic Multilingual Plane, and to is a one-byte or two-byte sequence.
|
|
/// As with mappingTable, a one-byte sequence is in range 0x00 to 0xFF, and a
|
|
/// two-byte sequence is in range 0x0100 to 0xFFFF.
|
|
///
|
|
/// Unicode code points are restricted to the Basic Multilingual Plane
|
|
/// (code points 0x0000 to 0xFFFF).
|
|
///
|
|
/// Items in both tables must be sorted by from, in ascending order.
|
|
|
|
~DoubleByteEncoding();
|
|
/// Destroys the DoubleByteEncoding.
|
|
|
|
int map(Poco::UInt16 encoded) const;
|
|
/// Maps a double-byte encoded character to its Unicode code point.
|
|
///
|
|
/// Returns the Unicode code point, or -1 if the encoded character is bad
|
|
/// and cannot be mapped.
|
|
|
|
int reverseMap(int cp) const;
|
|
/// Maps a Unicode code point to its double-byte representation.
|
|
///
|
|
/// Returns -1 if the code point cannot be mapped, otherwise
|
|
/// a value in range 0 to 0xFF for single-byte mappings, or
|
|
/// 0x0100 to 0xFFFF for double-byte mappings.
|
|
|
|
private:
|
|
DoubleByteEncoding();
|
|
|
|
const char** _names;
|
|
const TextEncoding::CharacterMap& _charMap;
|
|
const Mapping* _mappingTable;
|
|
const std::size_t _mappingTableSize;
|
|
const Mapping* _reverseMappingTable;
|
|
const std::size_t _reverseMappingTableSize;
|
|
};
|
|
|
|
|
|
} // namespace Poco
|
|
|
|
|
|
#endif // Encodings_DoubleByteEncoding_INCLUDED
|