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// Copyright (c) 1994 James Clark
// See the file COPYING for copying permission.
#include "splib.h"
#include "IdentityCodingSystem.h"
#include <limits.h>
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class IdentityDecoder : public Decoder {
public:
size_t decode(Char *to, const char *from, size_t fromLen,
const char **rest);
Boolean convertOffset(unsigned long &offset) const;
};
class IdentityEncoder : public RecoveringEncoder {
public:
IdentityEncoder();
void output(const Char *, size_t, OutputByteStream *);
};
IdentityCodingSystem::IdentityCodingSystem()
{
}
Decoder *IdentityCodingSystem::makeDecoder() const
{
return new IdentityDecoder;
}
Encoder *IdentityCodingSystem::makeEncoder() const
{
return new IdentityEncoder;
}
Boolean IdentityCodingSystem::isIdentity() const
{
return 1;
}
size_t IdentityDecoder::decode(Char *to, const char *from, size_t fromLen,
const char **rest)
{
if (sizeof(Char) == sizeof(char) && from == (char *)to) {
*rest = from + fromLen;
return fromLen;
}
for (size_t n = fromLen; n > 0; n--)
*to++ = (unsigned char)*from++; // zero extend
*rest = from;
return fromLen;
}
Boolean IdentityDecoder::convertOffset(unsigned long &) const
{
return true;
}
IdentityEncoder::IdentityEncoder()
{
}
void IdentityEncoder::output(const Char *s, size_t n, OutputByteStream *sb)
{
if (sizeof(Char) != sizeof(char)) {
for (size_t i = 0; i < n; i++) {
Char c = s[i];
if (c > UCHAR_MAX)
handleUnencodable(c, sb);
else
sb->sputc((unsigned char)c);
}
}
else
sb->sputn((const char *)s, n);
}
#ifdef SP_NAMESPACE
}
#endif
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