84 lines
1.6 KiB
C++
84 lines
1.6 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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#include "IdentityCodingSystem.h"
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#include <limits.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 IdentityDecoder : public Decoder {
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public:
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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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};
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class IdentityEncoder : public RecoveringEncoder {
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public:
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IdentityEncoder();
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void output(const Char *, size_t, OutputByteStream *);
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};
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IdentityCodingSystem::IdentityCodingSystem()
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{
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}
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Decoder *IdentityCodingSystem::makeDecoder() const
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{
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return new IdentityDecoder;
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}
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Encoder *IdentityCodingSystem::makeEncoder() const
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{
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return new IdentityEncoder;
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}
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Boolean IdentityCodingSystem::isIdentity() const
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{
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return 1;
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}
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size_t IdentityDecoder::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) == sizeof(char) && from == (char *)to) {
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*rest = from + fromLen;
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return fromLen;
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}
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for (size_t n = fromLen; n > 0; n--)
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*to++ = (unsigned char)*from++; // zero extend
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*rest = from;
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return fromLen;
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}
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Boolean IdentityDecoder::convertOffset(unsigned long &) const
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{
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return true;
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}
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IdentityEncoder::IdentityEncoder()
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{
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}
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void IdentityEncoder::output(const Char *s, size_t n, OutputByteStream *sb)
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{
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if (sizeof(Char) != sizeof(char)) {
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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 > UCHAR_MAX)
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handleUnencodable(c, sb);
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else
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sb->sputc((unsigned char)c);
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}
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}
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else
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sb->sputn((const char *)s, n);
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}
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#ifdef SP_NAMESPACE
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}
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#endif
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