116 lines
2.2 KiB
C++
116 lines
2.2 KiB
C++
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// Copyright (c) 1994 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 "EUCJPCodingSystem.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 EUCJPDecoder : public Decoder {
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public:
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EUCJPDecoder() { }
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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 EUCJPEncoder : public Encoder {
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public:
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EUCJPEncoder() { }
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void output(const Char *, size_t, OutputByteStream *);
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};
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Decoder *EUCJPCodingSystem::makeDecoder() const
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{
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return new EUCJPDecoder;
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}
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Encoder *EUCJPCodingSystem::makeEncoder() const
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{
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return new EUCJPEncoder;
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}
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size_t EUCJPDecoder::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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// G0
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*to++ = *us++;
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slen--;
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}
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else if (*us == 0x8e) {
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// G2
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if (slen < 2)
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break;
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slen -= 2;
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++us;
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*to++ = *us++ | 0x80;
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}
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else if (*us == 0x8f) {
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// G3
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if (slen < 3)
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break;
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slen -= 3;
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++us;
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unsigned short n = (*us++ | 0x80) << 8;
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n |= (*us++ & ~0x80);
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*to++ = n;
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}
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else {
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// G1
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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++ | 0x80);
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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 EUCJPEncoder::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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unsigned short mask = (unsigned short)(c & 0x8080);
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if (mask == 0)
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sb->sputc((unsigned char)(c & 0xff));
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else if (mask == 0x8080) {
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sb->sputc((unsigned char)((c >> 8) & 0xff));
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sb->sputc((unsigned char)(c & 0xff));
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}
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else if (mask == 0x0080) {
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sb->sputc((unsigned char)0x8e);
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sb->sputc((unsigned char)(c & 0xff));
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}
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else {
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// mask == 0x8000
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sb->sputc((unsigned char)0x8f);
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sb->sputc((unsigned char)((c >> 8) & 0xff));
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sb->sputc((unsigned char)(c & 0x7f));
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}
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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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