108 lines
2.1 KiB
C++
108 lines
2.1 KiB
C++
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// Copyright (c) 1994 James Clark, 2000 Matthias Clasen
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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 "Fixed2CodingSystem.h"
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#include "macros.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 Fixed2Decoder : public Decoder {
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public:
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Fixed2Decoder(Boolean lsbFirst);
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size_t decode(Char *to, const char *from, size_t fromLen,
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const char **rest);
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Boolean convertOffset(unsigned long &offset) const;
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private:
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Boolean lsbFirst_;
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};
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class Fixed2Encoder : public RecoveringEncoder {
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public:
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Fixed2Encoder();
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void output(const Char *, size_t, OutputByteStream *);
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};
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Decoder *Fixed2CodingSystem::makeDecoder(Boolean lsbFirst) const
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{
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return new Fixed2Decoder(lsbFirst);
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}
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Encoder *Fixed2CodingSystem::makeEncoder() const
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{
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return new Fixed2Encoder;
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}
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unsigned Fixed2CodingSystem::fixedBytesPerChar() const
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{
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return 2;
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}
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Fixed2Decoder::Fixed2Decoder(Boolean lsbFirst)
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: Decoder(2), lsbFirst_(lsbFirst)
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{
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}
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size_t Fixed2Decoder::decode(Char *to, const char *from, size_t fromLen,
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const char **rest)
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{
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if (sizeof(Char) == 2 && from == (char *)to
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&&
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#ifndef SP_BIG_ENDIAN
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!
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#endif
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lsbFirst_) {
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*rest = from + (fromLen & ~1);
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return fromLen/2;
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}
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fromLen &= ~1;
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*rest = from + fromLen;
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for (size_t n = fromLen; n > 0; n -= 2) {
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*to++ = lsbFirst_
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? ((unsigned char)from[1] << 8) + (unsigned char)from[0]
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: ((unsigned char)from[0] << 8) + (unsigned char)from[1];
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from += 2;
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}
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return fromLen/2;
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}
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Boolean Fixed2Decoder::convertOffset(unsigned long &n) const
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{
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n *= 2;
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return true;
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}
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Fixed2Encoder::Fixed2Encoder()
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{
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}
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void Fixed2Encoder::output(const Char *s, size_t n, OutputByteStream *sb)
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{
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for (size_t i = 0; i < n; i++) {
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Char c = s[i];
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if (c > 0xffff)
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handleUnencodable(c, sb);
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else {
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sb->sputc((c >> 8) & 0xff);
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sb->sputc(c & 0xff);
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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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