85 lines
1.5 KiB
C++
85 lines
1.5 KiB
C++
// Copyright (c) 1997 James Clark
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// See the file COPYING for copying permission.
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#include "splib.h"
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#ifdef SP_MULTI_BYTE
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#include "Big5CodingSystem.h"
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#ifdef SP_NAMESPACE
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namespace SP_NAMESPACE {
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#endif
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class Big5Decoder : public Decoder {
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public:
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Big5Decoder() { }
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size_t decode(Char *, const char *, size_t, const char **);
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private:
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};
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class Big5Encoder : public Encoder {
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public:
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Big5Encoder() { }
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void output(const Char *, size_t, OutputByteStream *);
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};
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Decoder *Big5CodingSystem::makeDecoder() const
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{
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return new Big5Decoder;
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}
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Encoder *Big5CodingSystem::makeEncoder() const
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{
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return new Big5Encoder;
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}
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size_t Big5Decoder::decode(Char *to, const char *s,
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size_t slen, const char **rest)
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{
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Char *start = to;
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const unsigned char *us = (const unsigned char *)s;
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while (slen > 0) {
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if (!(*us & 0x80)) {
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*to++ = *us++;
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slen--;
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}
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else {
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if (slen < 2)
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break;
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slen -= 2;
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unsigned short n = *us++ << 8;
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n |= *us++;
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*to++ = n;
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}
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}
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*rest = (const char *)us;
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return to - start;
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}
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void Big5Encoder::output(const Char *s, size_t n, OutputByteStream *sb)
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{
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for (; n > 0; s++, n--) {
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Char c = *s;
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if (c < 0x80)
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sb->sputc((unsigned char)c);
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else if (c & 0x8000) {
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sb->sputc((unsigned char)(c >> 8));
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sb->sputc((unsigned char)(c & 0xff));
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}
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else
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handleUnencodable(c, sb);
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}
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}
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#ifdef SP_NAMESPACE
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}
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#endif
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#else /* not SP_MULTI_BYTE */
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#ifndef __GNUG__
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static char non_empty_translation_unit; // sigh
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#endif
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#endif /* not SP_MULTI_BYTE */
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