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// Copyright (c) 1996 James Clark
// See the file COPYING for copying permission.
#ifdef __GNUG__
#pragma implementation
#endif
#include "splib.h"
#ifdef SP_MULTI_BYTE
#include <windows.h>
#include <io.h>
#include "Win32CodingSystem.h"
#include "Boolean.h"
#include "macros.h"
#ifdef SP_NAMESPACE
namespace SP_NAMESPACE {
#endif
class SingleByteWin32Decoder : public Decoder {
public:
SingleByteWin32Decoder(unsigned int codePage, Char defaultChar);
size_t decode(Char *to, const char *from, size_t fromLen,
const char **rest);
Boolean convertOffset(unsigned long &offset) const;
private:
Char map_[256];
};
class MultiByteWin32Decoder : public Decoder {
public:
MultiByteWin32Decoder(unsigned int codePage, Char defaultChar,
unsigned char *leadByte);
size_t decode(Char *to, const char *from, size_t fromLen,
const char **rest);
private:
unsigned int codePage_;
Char defaultChar_;
PackedBoolean isLeadByte_[256];
};
class Win32Encoder : public Encoder {
public:
Win32Encoder(unsigned int codePage);
~Win32Encoder();
void output(const Char *, size_t, OutputByteStream *);
private:
char *buf_;
size_t bufLen_;
unsigned int codePage_;
};
Win32CodingSystem::Win32CodingSystem(unsigned int codePage, Char defaultChar)
: codePage_(codePage), defaultChar_(defaultChar)
{
}
Win32CodingSystem::Win32CodingSystem(SpecialCodePage codePage,
Char defaultChar)
: defaultChar_(defaultChar)
{
if (codePage == codePageAnsi)
codePage_ = GetACP();
else
codePage_ = GetOEMCP();
}
Boolean Win32CodingSystem::isValid() const
{
return IsValidCodePage(codePage_);
}
Encoder *Win32CodingSystem::makeEncoder() const
{
return new Win32Encoder(codePage_);
}
Decoder *Win32CodingSystem::makeDecoder() const
{
CPINFO info;
if (GetCPInfo(codePage_, &info) && info.MaxCharSize > 1)
return new MultiByteWin32Decoder(codePage_, defaultChar_, info.LeadByte);
else
return new SingleByteWin32Decoder(codePage_, defaultChar_);
}
SingleByteWin32Decoder::SingleByteWin32Decoder(unsigned int codePage,
Char defaultChar)
{
for (int i = 0; i < 256; i++) {
char c = i;
wchar_t mapped;
if (MultiByteToWideChar(codePage, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
&c, 1, &mapped, 1) == 0)
map_[i] = defaultChar;
else
map_[i] = Char(mapped);
}
}
size_t SingleByteWin32Decoder::decode(Char *to, const char *from,
size_t fromLen, const char **rest)
{
for (size_t n = fromLen; n > 0; n--)
*to++ = map_[(unsigned char)*from++]; // zero extend
*rest = from;
return fromLen;
}
Boolean SingleByteWin32Decoder::convertOffset(unsigned long &) const
{
return 1;
}
MultiByteWin32Decoder::MultiByteWin32Decoder(unsigned int codePage,
Char defaultChar,
unsigned char *leadByte)
: defaultChar_(defaultChar), codePage_(codePage)
{
for (int i = 0; i < 256; i++)
isLeadByte_[i] = 0;
for (int i = 0; i < MAX_LEADBYTES; i += 2) {
if (leadByte[i] == 0 && leadByte[i + 1] == 0)
break;
int lim = leadByte[i + 1];
for (int j = leadByte[i]; j < lim; j++)
isLeadByte_[j] = 1;
}
}
size_t MultiByteWin32Decoder::decode(Char *to, const char *from,
size_t fromLen, const char **rest)
{
size_t i;
for (i = fromLen; i > 0; i--)
if (!isLeadByte_[(unsigned char)from[i - 1]])
break;
if ((fromLen - i) & 1)
fromLen--;
String<wchar_t> tow;
tow.resize(fromLen);
int count = MultiByteToWideChar(codePage_,
MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
from, fromLen, (wchar_t *)tow.data(), fromLen);
for (size_t i = 0; i < count; i++)
to[i] = Char(tow[i]);
if (count) {
*rest = from + fromLen;
return count;
}
Char *start = to;
// Try it character by character.
while (fromLen > 0) {
int nBytes = 1 + isLeadByte_[(unsigned char)*from];
ASSERT(nBytes <= fromLen);
wchar_t tow;
if (MultiByteToWideChar(codePage_, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
from, nBytes, &tow, 1) != 1)
*to = defaultChar_;
else
*to = Char(tow);
from += nBytes;
fromLen -= nBytes;
to++;
}
*rest = from;
return to - start;
}
Win32Encoder::Win32Encoder(unsigned int codePage)
: codePage_(codePage), buf_(0), bufLen_(0)
{
}
Win32Encoder::~Win32Encoder()
{
delete [] buf_;
}
void Win32Encoder::output(const Char *s, size_t n, OutputByteStream *sb)
{
if (n == 0)
return;
if (n*2 > bufLen_) {
delete [] buf_;
bufLen_ = n*2;
buf_ = new char[bufLen_];
}
String<wchar_t> ws;
ws.resize(n);
for (size_t i = 0; i < n; i++)
ws[i] = wchar_t(s[i]);
int nBytes = WideCharToMultiByte(codePage_,
0,
ws.data(),
n,
buf_,
bufLen_,
0,
0);
if (nBytes)
sb->sputn(buf_, nBytes);
}
#ifdef SP_NAMESPACE
}
#endif
#else /* not SP_MULTI_BYTE */
#ifndef __GNUG__
static char non_empty_translation_unit; // sigh
#endif
#endif /* not SP_MULTI_BYTE */
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