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pjs/xpcom/io/nsNativeCharsetUtils.cpp

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/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@netscape.com>
* Brian Stell <bstell@ix.netcom.com>
* Frank Tang <ftang@netscape.com>
* Brendan Eich <brendan@mozilla.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#if defined(XP_UNIX)
#include <stdlib.h> // mbtowc, wctomb
#include <locale.h> // setlocale
#include "nscore.h"
#include "prlock.h"
#include "nsAString.h"
//
// choose a conversion library. under linux we prefer using wcrtomb/mbrtowc
// to improve performance. other platforms in which wchar_t is unicode might
// benefit from this optimization as well.
//
#if defined(__linux) && defined(HAVE_WCRTOMB) && defined(HAVE_MBRTOWC)
#define USE_STDCONV 1
#elif defined(HAVE_ICONV) && defined(HAVE_NL_TYPES_H) && defined(HAVE_NL_LANGINFO)
#define USE_ICONV 1
#else
#define USE_STDCONV 1
#endif
static void
isolatin1_to_ucs2(const char **input, PRUint32 *inputLeft, PRUnichar **output, PRUint32 *outputLeft)
{
while (*inputLeft && *outputLeft) {
**output = (unsigned char) **input;
(*input)++;
(*inputLeft)--;
(*output)++;
(*outputLeft)--;
}
}
static void
ucs2_to_isolatin1(const PRUnichar **input, PRUint32 *inputLeft, char **output, PRUint32 *outputLeft)
{
while (*inputLeft && *outputLeft) {
**output = (unsigned char) **input;
(*input)++;
(*inputLeft)--;
(*output)++;
(*outputLeft)--;
}
}
//-----------------------------------------------------------------------------
// conversion using iconv
//-----------------------------------------------------------------------------
#if defined(USE_ICONV)
#include <nl_types.h> // CODESET
#include <langinfo.h> // nl_langinfo
#include <iconv.h> // iconv_open, iconv, iconv_close
#include <errno.h>
#if defined(HAVE_ICONV_WITH_CONST_INPUT)
#define ICONV_INPUT(x) (x)
#else
#define ICONV_INPUT(x) ((char **)x)
#endif
// solaris definitely needs this, but we'll enable it by default
// just in case...
#define ENABLE_UTF8_FALLBACK_SUPPORT
#define INVALID_ICONV_T ((iconv_t) -1)
static inline size_t
xp_iconv(iconv_t converter,
const char **input,
size_t *inputLeft,
char **output,
size_t *outputLeft)
{
size_t res, outputAvail = outputLeft ? *outputLeft : 0;
res = iconv(converter, ICONV_INPUT(input), inputLeft, output, outputLeft);
if (res == (size_t) -1) {
// on some platforms (e.g., linux) iconv will fail with
// E2BIG if it cannot convert _all_ of its input. it'll
// still adjust all of the in/out params correctly, so we
// can ignore this error. the assumption is that we will
// be called again to complete the conversion.
if ((errno == E2BIG) && (*outputLeft < outputAvail))
res = 0;
}
return res;
}
static inline iconv_t
xp_iconv_open(const char **to_list, const char **from_list)
{
iconv_t res;
const char **from_name;
const char **to_name;
// try all possible combinations to locate a converter.
to_name = to_list;
while (*to_name) {
if (**to_name) {
from_name = from_list;
while (*from_name) {
if (**from_name) {
res = iconv_open(*to_name, *from_name);
if (res != INVALID_ICONV_T)
return res;
}
from_name++;
}
}
to_name++;
}
return INVALID_ICONV_T;
}
static const char *UCS_2_NAMES[] = {
"UCS-2",
"UCS2",
"UCS_2",
"ucs-2",
"ucs2",
"ucs_2",
NULL
};
static const char *UTF_8_NAMES[] = {
"UTF-8",
"UTF8",
"UTF_8",
"utf-8",
"utf8",
"utf_8",
NULL
};
static const char *ISO_8859_1_NAMES[] = {
"ISO-8859-1",
"ISO8859-1",
"ISO88591",
"ISO_8859_1",
"ISO8859_1",
"iso-8859-1",
"iso8859-1",
"iso88591",
"iso_8859_1",
"iso8859_1",
NULL
};
class nsNativeCharsetConverter
{
public:
nsNativeCharsetConverter();
~nsNativeCharsetConverter();
nsresult NativeToUnicode(const char **input , PRUint32 *inputLeft,
PRUnichar **output, PRUint32 *outputLeft);
nsresult UnicodeToNative(const PRUnichar **input , PRUint32 *inputLeft,
char **output, PRUint32 *outputLeft);
static void GlobalInit();
static void GlobalShutdown();
private:
static iconv_t gNativeToUnicode;
static iconv_t gUnicodeToNative;
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
static iconv_t gNativeToUTF8;
static iconv_t gUTF8ToNative;
static iconv_t gUnicodeToUTF8;
static iconv_t gUTF8ToUnicode;
#endif
static PRLock *gLock;
static PRBool gInitialized;
static void LazyInit();
static void Lock() { if (gLock) PR_Lock(gLock); }
static void Unlock() { if (gLock) PR_Unlock(gLock); }
};
iconv_t nsNativeCharsetConverter::gNativeToUnicode = INVALID_ICONV_T;
iconv_t nsNativeCharsetConverter::gUnicodeToNative = INVALID_ICONV_T;
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
iconv_t nsNativeCharsetConverter::gNativeToUTF8 = INVALID_ICONV_T;
iconv_t nsNativeCharsetConverter::gUTF8ToNative = INVALID_ICONV_T;
iconv_t nsNativeCharsetConverter::gUnicodeToUTF8 = INVALID_ICONV_T;
iconv_t nsNativeCharsetConverter::gUTF8ToUnicode = INVALID_ICONV_T;
#endif
PRLock *nsNativeCharsetConverter::gLock = nsnull;
PRBool nsNativeCharsetConverter::gInitialized = PR_FALSE;
void
nsNativeCharsetConverter::LazyInit()
{
const char *blank_list[] = { "", NULL };
const char **native_charset_list = blank_list;
const char *native_charset = nl_langinfo(CODESET);
if (native_charset == nsnull) {
NS_ERROR("native charset is unknown");
// fallback to ISO-8859-1
native_charset_list = ISO_8859_1_NAMES;
}
else
native_charset_list[0] = native_charset;
gNativeToUnicode = xp_iconv_open(UCS_2_NAMES, native_charset_list);
gUnicodeToNative = xp_iconv_open(native_charset_list, UCS_2_NAMES);
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
if (gNativeToUnicode == INVALID_ICONV_T) {
gNativeToUTF8 = xp_iconv_open(UTF_8_NAMES, native_charset_list);
gUTF8ToUnicode = xp_iconv_open(UCS_2_NAMES, UTF_8_NAMES);
NS_ASSERTION(gNativeToUTF8 != INVALID_ICONV_T, "no native to utf-8 converter");
NS_ASSERTION(gUTF8ToUnicode != INVALID_ICONV_T, "no utf-8 to ucs-2 converter");
}
if (gUnicodeToNative == INVALID_ICONV_T) {
gUnicodeToUTF8 = xp_iconv_open(UTF_8_NAMES, UCS_2_NAMES);
gUTF8ToNative = xp_iconv_open(native_charset_list, UTF_8_NAMES);
NS_ASSERTION(gUnicodeToUTF8 != INVALID_ICONV_T, "no unicode to utf-8 converter");
NS_ASSERTION(gUTF8ToNative != INVALID_ICONV_T, "no utf-8 to native converter");
}
#else
NS_ASSERTION(gNativeToUnicode != INVALID_ICONV_T, "no native to ucs-2 converter");
NS_ASSERTION(gUnicodeToNative != INVALID_ICONV_T, "no ucs-2 to native converter");
#endif
gInitialized = PR_TRUE;
}
void
nsNativeCharsetConverter::GlobalInit()
{
gLock = PR_NewLock();
NS_ASSERTION(gLock, "lock creation failed");
}
void
nsNativeCharsetConverter::GlobalShutdown()
{
if (gLock) {
PR_DestroyLock(gLock);
gLock = nsnull;
}
if (gNativeToUnicode != INVALID_ICONV_T) {
iconv_close(gNativeToUnicode);
gNativeToUnicode = INVALID_ICONV_T;
}
if (gUnicodeToNative != INVALID_ICONV_T) {
iconv_close(gUnicodeToNative);
gUnicodeToNative = INVALID_ICONV_T;
}
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
if (gNativeToUTF8 != INVALID_ICONV_T) {
iconv_close(gNativeToUTF8);
gNativeToUTF8 = INVALID_ICONV_T;
}
if (gUTF8ToNative != INVALID_ICONV_T) {
iconv_close(gUTF8ToNative);
gUTF8ToNative = INVALID_ICONV_T;
}
if (gUnicodeToUTF8 != INVALID_ICONV_T) {
iconv_close(gUnicodeToUTF8);
gUnicodeToUTF8 = INVALID_ICONV_T;
}
if (gUTF8ToUnicode != INVALID_ICONV_T) {
iconv_close(gUTF8ToUnicode);
gUTF8ToUnicode = INVALID_ICONV_T;
}
#endif
gInitialized = PR_FALSE;
}
nsNativeCharsetConverter::nsNativeCharsetConverter()
{
Lock();
if (!gInitialized)
LazyInit();
}
nsNativeCharsetConverter::~nsNativeCharsetConverter()
{
// reset converters for next time
if (gNativeToUnicode != INVALID_ICONV_T)
xp_iconv(gNativeToUnicode, NULL, NULL, NULL, NULL);
if (gUnicodeToNative != INVALID_ICONV_T)
xp_iconv(gUnicodeToNative, NULL, NULL, NULL, NULL);
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
if (gNativeToUTF8 != INVALID_ICONV_T)
xp_iconv(gNativeToUTF8, NULL, NULL, NULL, NULL);
if (gUTF8ToNative != INVALID_ICONV_T)
xp_iconv(gUTF8ToNative, NULL, NULL, NULL, NULL);
if (gUnicodeToUTF8 != INVALID_ICONV_T)
xp_iconv(gUnicodeToUTF8, NULL, NULL, NULL, NULL);
if (gUTF8ToUnicode != INVALID_ICONV_T)
xp_iconv(gUTF8ToUnicode, NULL, NULL, NULL, NULL);
#endif
Unlock();
}
nsresult
nsNativeCharsetConverter::NativeToUnicode(const char **input,
PRUint32 *inputLeft,
PRUnichar **output,
PRUint32 *outputLeft)
{
size_t res = 0;
size_t inLeft = (size_t) *inputLeft;
size_t outLeft = (size_t) *outputLeft * 2;
if (gNativeToUnicode != INVALID_ICONV_T) {
res = xp_iconv(gNativeToUnicode, input, &inLeft, (char **) output, &outLeft);
if (res != (size_t) -1) {
*inputLeft = inLeft;
*outputLeft = outLeft / 2;
return NS_OK;
}
NS_WARNING("conversion from native to ucs-2 failed");
// reset converter
xp_iconv(gNativeToUnicode, NULL, NULL, NULL, NULL);
}
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
else if ((gNativeToUTF8 != INVALID_ICONV_T) &&
(gUTF8ToUnicode != INVALID_ICONV_T)) {
// convert first to UTF8, then from UTF8 to UCS2
const char *in = *input;
char ubuf[1024];
// we assume we're always called with enough space in |output|,
// so convert many chars at a time...
while (inLeft) {
char *p = ubuf;
size_t n = sizeof(ubuf);
res = xp_iconv(gNativeToUTF8, &in, &inLeft, &p, &n);
if (res == (size_t) -1) {
NS_ERROR("conversion from native to utf-8 failed");
break;
}
NS_ASSERTION(outLeft > 0, "bad assumption");
p = ubuf;
n = sizeof(ubuf) - n;
res = xp_iconv(gUTF8ToUnicode, (const char **) &p, &n, (char **) output, &outLeft);
if (res == (size_t) -1) {
NS_ERROR("conversion from utf-8 to ucs-2 failed");
break;
}
}
if (res != (size_t) -1) {
(*input) += (*inputLeft - inLeft);
*inputLeft = inLeft;
*outputLeft = outLeft / 2;
return NS_OK;
}
// reset converters
xp_iconv(gNativeToUTF8, NULL, NULL, NULL, NULL);
xp_iconv(gUTF8ToUnicode, NULL, NULL, NULL, NULL);
}
#endif
// fallback: zero-pad and hope for the best
isolatin1_to_ucs2(input, inputLeft, output, outputLeft);
return NS_OK;
}
nsresult
nsNativeCharsetConverter::UnicodeToNative(const PRUnichar **input,
PRUint32 *inputLeft,
char **output,
PRUint32 *outputLeft)
{
size_t res = 0;
size_t inLeft = (size_t) *inputLeft * 2;
size_t outLeft = (size_t) *outputLeft;
if (gUnicodeToNative != INVALID_ICONV_T) {
res = xp_iconv(gUnicodeToNative, (const char **) input, &inLeft, output, &outLeft);
if (res != (size_t) -1) {
*inputLeft = inLeft / 2;
*outputLeft = outLeft;
return NS_OK;
}
NS_ERROR("iconv failed");
// reset converter
xp_iconv(gUnicodeToNative, NULL, NULL, NULL, NULL);
}
#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
else if ((gUnicodeToUTF8 != INVALID_ICONV_T) &&
(gUTF8ToNative != INVALID_ICONV_T)) {
const char *in = (const char *) *input;
char ubuf[6]; // max utf-8 char length (really only needs to be 4 bytes)
// convert one uchar at a time...
while (inLeft && outLeft) {
char *p = ubuf;
size_t n = sizeof(ubuf), one_uchar = sizeof(PRUnichar);
res = xp_iconv(gUnicodeToUTF8, &in, &one_uchar, &p, &n);
if (res == (size_t) -1) {
NS_ERROR("conversion from ucs-2 to utf-8 failed");
break;
}
p = ubuf;
n = sizeof(ubuf) - n;
res = xp_iconv(gUTF8ToNative, (const char **) &p, &n, output, &outLeft);
if (res == (size_t) -1) {
if (errno == E2BIG) {
// not enough room for last uchar... back up and return.
in -= sizeof(PRUnichar);
res = 0;
}
else
NS_ERROR("conversion from utf-8 to native failed");
break;
}
inLeft -= sizeof(PRUnichar);
}
if (res != (size_t) -1) {
(*input) += (*inputLeft - inLeft/2);
*inputLeft = inLeft/2;
*outputLeft = outLeft;
return NS_OK;
}
// reset converters
xp_iconv(gUnicodeToUTF8, NULL, NULL, NULL, NULL);
xp_iconv(gUTF8ToNative, NULL, NULL, NULL, NULL);
}
#endif
// fallback: truncate and hope for the best
ucs2_to_isolatin1(input, inputLeft, output, outputLeft);
return NS_OK;
}
#endif // USE_ICONV
//-----------------------------------------------------------------------------
// conversion using mb[r]towc/wc[r]tomb
//-----------------------------------------------------------------------------
#if defined(USE_STDCONV)
#if defined(HAVE_WCRTOMB) || defined(HAVE_MBRTOWC)
#include <wchar.h> // mbrtowc, wcrtomb
#endif
class nsNativeCharsetConverter
{
public:
nsNativeCharsetConverter();
nsresult NativeToUnicode(const char **input , PRUint32 *inputLeft,
PRUnichar **output, PRUint32 *outputLeft);
nsresult UnicodeToNative(const PRUnichar **input , PRUint32 *inputLeft,
char **output, PRUint32 *outputLeft);
static void GlobalInit();
static void GlobalShutdown() { }
private:
static PRBool gWCharIsUnicode;
#if defined(HAVE_WCRTOMB) || defined(HAVE_MBRTOWC)
mbstate_t ps;
#endif
};
PRBool nsNativeCharsetConverter::gWCharIsUnicode = PR_FALSE;
nsNativeCharsetConverter::nsNativeCharsetConverter()
{
#if defined(HAVE_WCRTOMB) || defined(HAVE_MBRTOWC)
memset(&ps, 0, sizeof(ps));
#endif
}
void
nsNativeCharsetConverter::GlobalInit()
{
// verify that wchar_t for the current locale is actually unicode.
// if it is not, then we should avoid calling mbtowc/wctomb and
// just fallback on zero-pad/truncation conversion.
//
// this test cannot be done at build time because the encoding of
// wchar_t may depend on the runtime locale. sad, but true!!
//
// so, if wchar_t is unicode then converting an ASCII character
// to wchar_t should not change its numeric value. we'll just
// check what happens with the ASCII 'a' character.
//
// this test is not perfect... obviously, it could yield false
// positives, but then at least ASCII text would be converted
// properly (or maybe just the 'a' character) -- oh well :(
char a = 'a';
unsigned int w = 0;
int res = mbtowc((wchar_t *) &w, &a, 1);
gWCharIsUnicode = (res != -1 && w == 'a');
#ifdef DEBUG
if (!gWCharIsUnicode)
NS_WARNING("wchar_t is not unicode (unicode conversion will be lossy)");
#endif
}
nsresult
nsNativeCharsetConverter::NativeToUnicode(const char **input,
PRUint32 *inputLeft,
PRUnichar **output,
PRUint32 *outputLeft)
{
if (gWCharIsUnicode) {
int incr;
// cannot use wchar_t here since it may have been redefined (e.g.,
// via -fshort-wchar). hopefully, sizeof(tmp) is sufficient XP.
unsigned int tmp = 0;
while (*inputLeft && *outputLeft) {
#ifdef HAVE_MBRTOWC
incr = (int) mbrtowc((wchar_t *) &tmp, *input, *inputLeft, &ps);
#else
// XXX is this thread-safe?
incr = (int) mbtowc((wchar_t *) &tmp, *input, *inputLeft);
#endif
if (incr < 0) {
NS_WARNING("mbtowc failed: possible charset mismatch");
// zero-pad and hope for the best
tmp = (unsigned char) **input;
incr = 1;
}
**output = (PRUnichar) tmp;
(*input) += incr;
(*inputLeft) -= incr;
(*output)++;
(*outputLeft)--;
}
}
else {
// wchar_t isn't unicode, so the best we can do is treat the
// input as if it is isolatin1 :(
isolatin1_to_ucs2(input, inputLeft, output, outputLeft);
}
return NS_OK;
}
nsresult
nsNativeCharsetConverter::UnicodeToNative(const PRUnichar **input,
PRUint32 *inputLeft,
char **output,
PRUint32 *outputLeft)
{
if (gWCharIsUnicode) {
int incr;
while (*inputLeft && *outputLeft >= MB_CUR_MAX) {
#ifdef HAVE_WCRTOMB
incr = (int) wcrtomb(*output, (wchar_t) **input, &ps);
#else
// XXX is this thread-safe?
incr = (int) wctomb(*output, (wchar_t) **input);
#endif
if (incr < 0) {
NS_WARNING("mbtowc failed: possible charset mismatch");
**output = (unsigned char) **input; // truncate
incr = 1;
}
// most likely we're dead anyways if this assertion should fire
NS_ASSERTION(PRUint32(incr) <= *outputLeft, "wrote beyond end of string");
(*output) += incr;
(*outputLeft) -= incr;
(*input)++;
(*inputLeft)--;
}
}
else {
// wchar_t isn't unicode, so the best we can do is treat the
// input as if it is isolatin1 :(
ucs2_to_isolatin1(input, inputLeft, output, outputLeft);
}
return NS_OK;
}
#endif // USE_STDCONV
//-----------------------------------------------------------------------------
// API implementation
//-----------------------------------------------------------------------------
NS_COM nsresult
NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
{
nsNativeCharsetConverter conv;
nsresult rv;
PRUint32 inputLen = input.Length();
output.Truncate();
nsACString::const_iterator iter, end;
input.BeginReading(iter);
input.EndReading(end);
//
// OPTIMIZATION: preallocate space for largest possible result; convert
// directly into the result buffer to avoid intermediate buffer copy.
//
// this will generally result in a larger allocation, but that seems
// better than an extra buffer copy.
//
output.SetLength(inputLen);
nsAString::iterator out_iter;
output.BeginWriting(out_iter);
PRUnichar *result = out_iter.get();
PRUint32 resultLeft = inputLen;
PRUint32 size;
for (; iter != end; iter.advance(size)) {
const char *buf = iter.get();
PRUint32 bufLeft = size = iter.size_forward();
rv = conv.NativeToUnicode(&buf, &bufLeft, &result, &resultLeft);
if (NS_FAILED(rv)) return rv;
NS_ASSERTION(bufLeft == 0, "did not consume entire input buffer");
}
output.SetLength(inputLen - resultLeft);
return NS_OK;
}
NS_COM nsresult
NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
{
nsNativeCharsetConverter conv;
nsresult rv;
output.Truncate();
nsAString::const_iterator iter, end;
input.BeginReading(iter);
input.EndReading(end);
// cannot easily avoid intermediate buffer copy.
char temp[4096];
PRUint32 size;
for (; iter != end; iter.advance(size)) {
const PRUnichar *buf = iter.get();
PRUint32 bufLeft = size = iter.size_forward();
while (bufLeft) {
char *p = temp;
PRUint32 tempLeft = sizeof(temp);
rv = conv.UnicodeToNative(&buf, &bufLeft, &p, &tempLeft);
if (NS_FAILED(rv)) return rv;
if (tempLeft < sizeof(temp))
output.Append(temp, sizeof(temp) - tempLeft);
}
}
return NS_OK;
}
void
NS_StartupNativeCharsetUtils()
{
//
// need to initialize the locale or else charset conversion will fail.
// better not delay this in case some other component alters the locale
// settings.
//
// XXX we assume that we are called early enough that we should
// always be the first to care about the locale's charset.
//
setlocale(LC_CTYPE, "");
nsNativeCharsetConverter::GlobalInit();
}
void
NS_ShutdownNativeCharsetUtils()
{
nsNativeCharsetConverter::GlobalShutdown();
}
#else // non XP_UNIX implementations go here...
#include "nsDebug.h"
#include "nsAString.h"
NS_COM nsresult
NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
{
NS_NOTREACHED("NS_CopyNativeToUnicode");
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_COM nsresult
NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
{
NS_NOTREACHED("NS_CopyUnicodeToNative");
return NS_ERROR_NOT_IMPLEMENTED;
}
void
NS_StartupNativeCharsetUtils()
{
}
void
NS_ShutdownNativeCharsetUtils()
{
}
#endif
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