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// Copyright (c) 1997 James Clark
// See the file COPYING for copying permission.
#include "splib.h"
#include "TranslateCodingSystem.h"
#include "types.h"
#include "Owner.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class TranslateDecoder : public Decoder {
public:
TranslateDecoder(Decoder *, const ConstPtr<CharMapResource<Char> > &);
size_t decode(Char *, const char *, size_t, const char **);
Boolean convertOffset(unsigned long &offset) const;
private:
Owner<Decoder> decoder_;
ConstPtr<CharMapResource<Char> > map_;
};
TranslateDecoder::TranslateDecoder(Decoder *decoder,
const ConstPtr<CharMapResource<Char> > &map)
: Decoder(decoder->minBytesPerChar()), decoder_(decoder), map_(map)
{
}
Boolean TranslateDecoder::convertOffset(unsigned long &offset) const
{
return decoder_->convertOffset(offset);
}
size_t TranslateDecoder::decode(Char *to, const char *s,
size_t slen, const char **rest)
{
size_t n = decoder_->decode(to, s, slen, rest);
for (size_t i = 0; i < n; i++)
to[i] = (*map_)[to[i]];
return n;
}
// FIXME set unencodeable handler for underlying encoder
class TranslateEncoder : public RecoveringEncoder {
public:
TranslateEncoder(Encoder *, const ConstPtr<CharMapResource<Char> > &map,
Char illegalChar);
void output(const Char *, size_t, OutputByteStream *);
void output(Char *, size_t, OutputByteStream *);
void startFile(OutputByteStream *);
private:
Owner<Encoder> encoder_;
ConstPtr<CharMapResource<Char> > map_;
Char illegalChar_;
enum { bufSize = 256 };
Char buf_[bufSize];
};
TranslateEncoder::TranslateEncoder(Encoder *encoder,
const ConstPtr<CharMapResource<Char> > &map,
Char illegalChar)
: encoder_(encoder), map_(map), illegalChar_(illegalChar)
{
}
void TranslateEncoder::startFile(OutputByteStream *sbuf)
{
encoder_->startFile(sbuf);
}
void TranslateEncoder::output(const Char *s, size_t n, OutputByteStream *sbuf)
{
size_t j = 0;
for (; n > 0; s++, n--) {
Char c = (*map_)[*s];
if (c == illegalChar_) {
if (j > 0) {
encoder_->output(buf_, j, sbuf);
j = 0;
}
handleUnencodable(*s, sbuf);
}
else {
if (j >= bufSize) {
encoder_->output(buf_, j, sbuf);
j = 0;
}
buf_[j++] = c;
}
}
if (j > 0)
encoder_->output(buf_, j, sbuf);
}
void TranslateEncoder::output(Char *s, size_t n, OutputByteStream *sbuf)
{
size_t i = 0;
for (;;) {
if (i == n) {
if (n > 0)
encoder_->output(s, n, sbuf);
break;
}
Char c = (*map_)[s[i]];
if (c == illegalChar_) {
if (i > 0)
encoder_->output(s, i, sbuf);
handleUnencodable(s[i], sbuf);
i++;
s += i;
n -= i;
i = 0;
}
else
s[i++] = c;
}
}
TranslateCodingSystem::TranslateCodingSystem(const CodingSystem *sub,
const Desc *desc,
const CharsetInfo *charset,
Char illegalChar,
Char replacementChar)
: sub_(sub),
desc_(desc),
charset_(charset),
illegalChar_(illegalChar),
replacementChar_(replacementChar)
{
}
Decoder *TranslateCodingSystem::makeDecoder() const
{
if (decodeMap_.isNull()) {
CharMapResource<Char> *map = new CharMapResource<Char>(replacementChar_);
*(ConstPtr<CharMapResource<Char> > *)&decodeMap_ = map;
for (const Desc *d = desc_; d->number != CharsetRegistry::UNREGISTERED; d++) {
Owner<CharsetRegistry::Iter> iter(CharsetRegistry::makeIter(d->number));
if (iter) {
WideChar min;
WideChar max;
UnivChar univ;
while (iter->next(min, max, univ)) {
do {
ISet<WideChar> set;
WideChar sysChar;
WideChar count;
int n = charset_->univToDesc(univ, sysChar, set, count);
if (count > (max - min) + 1)
count = (max - min) + 1;
if (n) {
for (WideChar i = 0; i < count; i++)
map->setChar(min + d->add + i, sysChar + i);
}
min += count - 1;
univ += count;
} while (min++ != max);
}
}
}
}
return new TranslateDecoder(sub_->makeDecoder(), decodeMap_);
}
Encoder *TranslateCodingSystem::makeEncoder() const
{
if (encodeMap_.isNull()) {
CharMapResource<Char> *map = new CharMapResource<Char>(illegalChar_);
*(ConstPtr<CharMapResource<Char> > *)&encodeMap_ = map;
for (const Desc *d = desc_; d->number != CharsetRegistry::UNREGISTERED; d++) {
Owner<CharsetRegistry::Iter> iter(CharsetRegistry::makeIter(d->number));
if (iter) {
WideChar min;
WideChar max;
UnivChar univ;
while (iter->next(min, max, univ)) {
do {
ISet<WideChar> set;
WideChar sysChar;
WideChar count;
int n = charset_->univToDesc(univ, sysChar, set, count);
if (count > (max - min) + 1)
count = (max - min) + 1;
if (n) {
for (WideChar i = 0; i < count; i++)
map->setChar(sysChar + i, min + d->add + i);
}
min += count - 1;
univ += count;
} while (min++ != max);
}
}
}
}
return new TranslateEncoder(sub_->makeEncoder(), encodeMap_, illegalChar_);
}
unsigned TranslateCodingSystem::fixedBytesPerChar() const
{
return sub_->fixedBytesPerChar();
}
#ifdef SP_NAMESPACE
}
#endif
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