mirror of
https://git.lyx.org/repos/lyx.git
synced 2024-09-23 08:39:07 +00:00
5cbe5cf5ad
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@18913 a592a061-630c-0410-9148-cb99ea01b6c8
348 lines
11 KiB
C++
348 lines
11 KiB
C++
/**
|
|
* \file docstream.cpp
|
|
* This file is part of LyX, the document processor.
|
|
* Licence details can be found in the file COPYING.
|
|
*
|
|
* \author Georg Baum
|
|
*
|
|
* Full author contact details are available in file CREDITS.
|
|
*/
|
|
|
|
#include <config.h>
|
|
|
|
#include "docstream.h"
|
|
#include "unicode.h"
|
|
|
|
#include <cerrno>
|
|
#include <cstdio>
|
|
#include <iconv.h>
|
|
#include <locale>
|
|
|
|
|
|
using lyx::ucs4_codeset;
|
|
|
|
using std::string;
|
|
|
|
|
|
namespace {
|
|
|
|
// We use C IO throughout this file, because the facets might be used with
|
|
// lyxerr in the future.
|
|
|
|
|
|
/// codecvt facet for conversion of UCS4 (internal representation) to UTF8
|
|
/// (external representation) or vice versa
|
|
class iconv_codecvt_facet : public std::codecvt<lyx::char_type, char, std::mbstate_t>
|
|
{
|
|
typedef std::codecvt<lyx::char_type, char, std::mbstate_t> base;
|
|
public:
|
|
/// Constructor. You have to specify with \p inout whether you want
|
|
/// to use this facet only for input, only for output or for both.
|
|
explicit iconv_codecvt_facet(string const & encoding = "UTF-8",
|
|
std::ios_base::openmode inout = std::ios_base::in | std::ios_base::out,
|
|
size_t refs = 0)
|
|
: base(refs), encoding_(encoding)
|
|
{
|
|
if (inout & std::ios_base::in) {
|
|
in_cd_ = iconv_open(ucs4_codeset, encoding.c_str());
|
|
if (in_cd_ == (iconv_t)(-1)) {
|
|
fprintf(stderr, "Error %d returned from iconv_open(in_cd_): %s\n",
|
|
errno, strerror(errno));
|
|
fflush(stderr);
|
|
throw lyx::iconv_codecvt_facet_exception();
|
|
}
|
|
} else
|
|
in_cd_ = (iconv_t)(-1);
|
|
if (inout & std::ios_base::out) {
|
|
out_cd_ = iconv_open(encoding.c_str(), ucs4_codeset);
|
|
if (out_cd_ == (iconv_t)(-1)) {
|
|
fprintf(stderr, "Error %d returned from iconv_open(out_cd_): %s\n",
|
|
errno, strerror(errno));
|
|
fflush(stderr);
|
|
throw lyx::iconv_codecvt_facet_exception();
|
|
}
|
|
} else
|
|
out_cd_ = (iconv_t)(-1);
|
|
}
|
|
protected:
|
|
virtual ~iconv_codecvt_facet()
|
|
{
|
|
if (in_cd_ != (iconv_t)(-1))
|
|
if (iconv_close(in_cd_) == -1) {
|
|
fprintf(stderr, "Error %d returned from iconv_close(in_cd_): %s\n",
|
|
errno, strerror(errno));
|
|
fflush(stderr);
|
|
}
|
|
if (out_cd_ != (iconv_t)(-1))
|
|
if (iconv_close(out_cd_) == -1) {
|
|
fprintf(stderr, "Error %d returned from iconv_close(out_cd_): %s\n",
|
|
errno, strerror(errno));
|
|
fflush(stderr);
|
|
}
|
|
}
|
|
virtual result do_out(state_type &, intern_type const * from,
|
|
intern_type const * from_end, intern_type const *& from_next,
|
|
extern_type * to, extern_type * to_end,
|
|
extern_type *& to_next) const
|
|
{
|
|
size_t inbytesleft = (from_end - from) * sizeof(intern_type);
|
|
size_t outbytesleft = (to_end - to) * sizeof(extern_type);
|
|
from_next = from;
|
|
to_next = to;
|
|
result const retval = do_iconv(out_cd_,
|
|
reinterpret_cast<char const **>(&from_next),
|
|
&inbytesleft, &to_next, &outbytesleft);
|
|
if (retval == base::error) {
|
|
fprintf(stderr,
|
|
"Error %d returned from iconv when converting from %s to %s: %s\n",
|
|
errno, ucs4_codeset, encoding_.c_str(),
|
|
strerror(errno));
|
|
fputs("Converted input:", stderr);
|
|
for (intern_type const * i = from; i < from_next; ++i) {
|
|
unsigned int const c = *i;
|
|
fprintf(stderr, " 0x%04x", c);
|
|
}
|
|
unsigned int const c = *from_next;
|
|
fprintf(stderr, "\nStopped at: 0x%04x\n", c);
|
|
fputs("Unconverted input:", stderr);
|
|
for (intern_type const * i = from_next + 1; i < from_end; ++i) {
|
|
unsigned int const c = *i;
|
|
fprintf(stderr, " 0x%04x", c);
|
|
}
|
|
fputs("\nConverted output:", stderr);
|
|
for (extern_type const * i = to; i < to_next; ++i) {
|
|
// extern_type may be signed, avoid output of
|
|
// something like 0xffffffc2
|
|
unsigned int const c =
|
|
*reinterpret_cast<unsigned char const *>(i);
|
|
fprintf(stderr, " 0x%02x", c);
|
|
}
|
|
fputc('\n', stderr);
|
|
fflush(stderr);
|
|
}
|
|
return retval;
|
|
}
|
|
virtual result do_unshift(state_type &, extern_type * to,
|
|
extern_type *, extern_type *& to_next) const
|
|
{
|
|
// utf8 does not use shifting
|
|
to_next = to;
|
|
return base::noconv;
|
|
}
|
|
virtual result do_in(state_type &,
|
|
extern_type const * from, extern_type const * from_end,
|
|
extern_type const *& from_next,
|
|
intern_type * to, intern_type * to_end,
|
|
intern_type *& to_next) const
|
|
{
|
|
size_t inbytesleft = (from_end - from) * sizeof(extern_type);
|
|
size_t outbytesleft = (to_end - to) * sizeof(intern_type);
|
|
from_next = from;
|
|
to_next = to;
|
|
result const retval = do_iconv(in_cd_, &from_next, &inbytesleft,
|
|
reinterpret_cast<char **>(&to_next),
|
|
&outbytesleft);
|
|
if (retval == base::error) {
|
|
fprintf(stderr,
|
|
"Error %d returned from iconv when converting from %s to %s: %s\n",
|
|
errno, encoding_.c_str(), ucs4_codeset,
|
|
strerror(errno));
|
|
fputs("Converted input:", stderr);
|
|
for (extern_type const * i = from; i < from_next; ++i) {
|
|
// extern_type may be signed, avoid output of
|
|
// something like 0xffffffc2
|
|
unsigned int const c =
|
|
*reinterpret_cast<unsigned char const *>(i);
|
|
fprintf(stderr, " 0x%02x", c);
|
|
}
|
|
unsigned int const c =
|
|
*reinterpret_cast<unsigned char const *>(from_next);
|
|
fprintf(stderr, "\nStopped at: 0x%02x\n", c);
|
|
fputs("Unconverted input:", stderr);
|
|
for (extern_type const * i = from_next + 1; i < from_end; ++i) {
|
|
unsigned int const c =
|
|
*reinterpret_cast<unsigned char const *>(i);
|
|
fprintf(stderr, " 0x%02x", c);
|
|
}
|
|
fputs("\nConverted output:", stderr);
|
|
for (intern_type const * i = to; i < to_next; ++i) {
|
|
unsigned int const c = *i;
|
|
fprintf(stderr, " 0x%02x", c);
|
|
}
|
|
fputc('\n', stderr);
|
|
fflush(stderr);
|
|
}
|
|
return retval;
|
|
}
|
|
virtual int do_encoding() const throw()
|
|
{
|
|
return 0;
|
|
}
|
|
virtual bool do_always_noconv() const throw()
|
|
{
|
|
return false;
|
|
}
|
|
virtual int do_length(state_type & /*state*/, extern_type const * from,
|
|
extern_type const * end, size_t max) const
|
|
{
|
|
// The docs are a bit unclear about this method.
|
|
// It seems that we should calculate the actual length of the
|
|
// converted sequence, but that would not make sense, since
|
|
// once could just do the conversion directly.
|
|
// Therefore we just return the number of unconverted
|
|
// characters, since that is the best guess we can do.
|
|
#if 0
|
|
intern_type * to = new intern_type[max];
|
|
intern_type * to_end = to + max;
|
|
intern_type * to_next = to;
|
|
extern_type const * from_next = from;
|
|
do_in(state, from, end, from_next, to, to_end, to_next);
|
|
delete[] to;
|
|
return to_next - to;
|
|
#else
|
|
size_t const length = end - from;
|
|
return std::min(length, max);
|
|
#endif
|
|
}
|
|
virtual int do_max_length() const throw()
|
|
{
|
|
// UTF8 uses at most 4 bytes to represent one UCS4 code point
|
|
// (see RFC 3629). RFC 2279 specifies 6 bytes, but that
|
|
// information is outdated, and RFC 2279 has been superseded by
|
|
// RFC 3629.
|
|
// All other encodings encode one UCS4 code point in one byte
|
|
// (and can therefore only encode a subset of UCS4)
|
|
return encoding_ == "UTF-8" ? 4 : 1;
|
|
}
|
|
private:
|
|
/// Do the actual conversion. The interface is equivalent to that of
|
|
/// iconv() (but const correct).
|
|
inline base::result do_iconv(iconv_t cd, char const ** from,
|
|
size_t * inbytesleft, char ** to, size_t * outbytesleft) const
|
|
{
|
|
char const * const to_start = *to;
|
|
size_t converted = iconv(cd, const_cast<char ICONV_CONST **>(from),
|
|
inbytesleft, to, outbytesleft);
|
|
if (converted == (size_t)(-1)) {
|
|
switch(errno) {
|
|
case EINVAL:
|
|
case E2BIG:
|
|
return base::partial;
|
|
case EILSEQ:
|
|
default:
|
|
return base::error;
|
|
}
|
|
}
|
|
if (*to == to_start)
|
|
return base::noconv;
|
|
return base::ok;
|
|
}
|
|
iconv_t in_cd_;
|
|
iconv_t out_cd_;
|
|
/// The narrow encoding
|
|
std::string encoding_;
|
|
};
|
|
|
|
} // namespace anon
|
|
|
|
|
|
namespace lyx {
|
|
|
|
|
|
const char * iconv_codecvt_facet_exception::what() const throw()
|
|
{
|
|
return "iconv problem in iconv_codecvt_facet initialization";
|
|
}
|
|
|
|
|
|
idocfstream::idocfstream(string const & encoding) : base()
|
|
{
|
|
std::locale global;
|
|
std::locale locale(global, new iconv_codecvt_facet(encoding, in));
|
|
imbue(locale);
|
|
}
|
|
|
|
|
|
idocfstream::idocfstream(const char* s, std::ios_base::openmode mode,
|
|
string const & encoding)
|
|
: base()
|
|
{
|
|
// We must imbue the stream before openening the file
|
|
std::locale global;
|
|
std::locale locale(global, new iconv_codecvt_facet(encoding, in));
|
|
imbue(locale);
|
|
open(s, mode);
|
|
}
|
|
|
|
|
|
odocfstream::odocfstream(string const & encoding) : base()
|
|
{
|
|
std::locale global;
|
|
std::locale locale(global, new iconv_codecvt_facet(encoding, out));
|
|
imbue(locale);
|
|
}
|
|
|
|
|
|
odocfstream::odocfstream(const char* s, std::ios_base::openmode mode,
|
|
string const & encoding)
|
|
: base()
|
|
{
|
|
// We must imbue the stream before openening the file
|
|
std::locale global;
|
|
std::locale locale(global, new iconv_codecvt_facet(encoding, out));
|
|
imbue(locale);
|
|
open(s, mode);
|
|
}
|
|
|
|
|
|
SetEnc setEncoding(string const & encoding)
|
|
{
|
|
return SetEnc(encoding);
|
|
}
|
|
|
|
|
|
odocstream & operator<<(odocstream & os, SetEnc e)
|
|
{
|
|
if (std::has_facet<iconv_codecvt_facet>(os.rdbuf()->getloc())) {
|
|
// This stream must be a file stream, since we never imbue
|
|
// any other stream with a locale having a iconv_codecvt_facet.
|
|
// Flush the stream so that all pending output is written
|
|
// with the old encoding.
|
|
os.flush();
|
|
std::locale locale(os.rdbuf()->getloc(),
|
|
new iconv_codecvt_facet(e.encoding, std::ios_base::out));
|
|
// FIXME Does changing the codecvt facet of an open file
|
|
// stream always work? It does with gcc 4.1, but I have read
|
|
// somewhere that it does not with MSVC.
|
|
// What does the standard say?
|
|
os.imbue(locale);
|
|
}
|
|
return os;
|
|
}
|
|
|
|
}
|
|
|
|
#if ! defined(USE_WCHAR_T) && defined(__GNUC__)
|
|
// We get undefined references to these virtual methods. This looks like
|
|
// a bug in gcc. The implementation here does not do anything useful, since
|
|
// it is overriden in iconv_codecvt_facet.
|
|
namespace std {
|
|
template<> codecvt<lyx::char_type, char, mbstate_t>::result
|
|
codecvt<lyx::char_type, char, mbstate_t>::do_out(mbstate_t &, const lyx::char_type *, const lyx::char_type *, const lyx::char_type *&,
|
|
char *, char *, char *&) const { return error; }
|
|
template<> codecvt<lyx::char_type, char, mbstate_t>::result
|
|
codecvt<lyx::char_type, char, mbstate_t>::do_unshift(mbstate_t &, char *, char *, char *&) const { return error; }
|
|
template<> codecvt<lyx::char_type, char, mbstate_t>::result
|
|
codecvt<lyx::char_type, char, mbstate_t>::do_in(mbstate_t &, const char *, const char *, const char *&,
|
|
lyx::char_type *, lyx::char_type *, lyx::char_type *&) const { return error; }
|
|
template<> int codecvt<lyx::char_type, char, mbstate_t>::do_encoding() const throw() { return 0; }
|
|
template<> bool codecvt<lyx::char_type, char, mbstate_t>::do_always_noconv() const throw() { return true; }
|
|
#if __GNUC__ == 3 && __GNUC_MINOR__ < 4
|
|
template<> int codecvt<lyx::char_type, char, mbstate_t>::do_length(mbstate_t const &, const char *, const char *, size_t) const { return 1; }
|
|
#else
|
|
template<> int codecvt<lyx::char_type, char, mbstate_t>::do_length(mbstate_t &, const char *, const char *, size_t) const { return 1; }
|
|
#endif
|
|
template<> int codecvt<lyx::char_type, char, mbstate_t>::do_max_length() const throw() { return 4; }
|
|
}
|
|
#endif
|