summaryrefslogtreecommitdiffstats
path: root/src/libs/xpcom18a4/xpcom/io/nsNativeCharsetUtils.cpp
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--src/libs/xpcom18a4/xpcom/io/nsNativeCharsetUtils.cpp1280
1 files changed, 1280 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/io/nsNativeCharsetUtils.cpp b/src/libs/xpcom18a4/xpcom/io/nsNativeCharsetUtils.cpp
new file mode 100644
index 00000000..55b5c63c
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/io/nsNativeCharsetUtils.cpp
@@ -0,0 +1,1280 @@
+/* ***** 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>
+ * Sergei Dolgov <sergei_d@fi.fi.tartu.ee>
+ *
+ * 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 ***** */
+
+#include "xpcom-private.h"
+
+//-----------------------------------------------------------------------------
+// XP_UNIX
+//-----------------------------------------------------------------------------
+#if defined(XP_UNIX)
+
+#include <stdlib.h> // mbtowc, wctomb
+#include <locale.h> // setlocale
+#include "nscore.h"
+#include "prlock.h"
+#include "nsAString.h"
+#include "nsReadableUtils.h"
+
+//
+// choose a conversion library. we used to use mbrtowc/wcrtomb under Linux,
+// but that doesn't work for non-BMP characters whether we use '-fshort-wchar'
+// or not (see bug 206811 and
+// news://news.mozilla.org:119/bajml3$fvr1@ripley.netscape.com). we now use
+// iconv for all platforms where nltypes.h and nllanginfo.h are present
+// along with iconv.
+//
+#if defined(HAVE_ICONV) && defined(HAVE_NL_TYPES_H) && defined(HAVE_LANGINFO_CODESET)
+#define USE_ICONV 1
+#else
+#define USE_STDCONV 1
+#endif
+
+static void
+isolatin1_to_utf16(const char **input, PRUint32 *inputLeft, PRUnichar **output, PRUint32 *outputLeft)
+{
+ while (*inputLeft && *outputLeft) {
+ **output = (unsigned char) **input;
+ (*input)++;
+ (*inputLeft)--;
+ (*output)++;
+ (*outputLeft)--;
+ }
+}
+
+static void
+utf16_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... but we know for sure that iconv(3) in glibc
+// doesn't need this.
+#if !defined(__GLIBC__)
+#define ENABLE_UTF8_FALLBACK_SUPPORT
+#endif
+
+#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 void
+xp_iconv_reset(iconv_t converter)
+{
+ // NOTE: the man pages on Solaris claim that you can pass NULL
+ // for all parameter to reset the converter, but beware the
+ // evil Solaris crash if you go down this route >:-)
+
+ const char *zero_char_in_ptr = NULL;
+ char *zero_char_out_ptr = NULL;
+ size_t zero_size_in = 0,
+ zero_size_out = 0;
+
+ xp_iconv(converter, &zero_char_in_ptr,
+ &zero_size_in,
+ &zero_char_out_ptr,
+ &zero_size_out);
+}
+
+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;
+}
+
+/*
+ * PRUnichar[] is NOT a UCS-2 array BUT a UTF-16 string. Therefore, we
+ * have to use UTF-16 with iconv(3) on platforms where it's supported.
+ * However, the way UTF-16 and UCS-2 are interpreted varies across platforms
+ * and implementations of iconv(3). On Tru64, it also depends on the environment
+ * variable. To avoid the trouble arising from byte-swapping
+ * (bug 208809), we have to try UTF-16LE/BE and UCS-2LE/BE before falling
+ * back to UTF-16 and UCS-2 and variants. We assume that UTF-16 and UCS-2
+ * on systems without UTF-16LE/BE and UCS-2LE/BE have the native endianness,
+ * which isn't the case of glibc 2.1.x, for which we use 'UNICODELITTLE'
+ * and 'UNICODEBIG'. It's also not true of Tru64 V4 when the environment
+ * variable ICONV_BYTEORDER is set to 'big-endian', about which not much
+ * can be done other than adding a note in the release notes. (bug 206811)
+ */
+static const char *UTF_16_NAMES[] = {
+#if defined(IS_LITTLE_ENDIAN)
+ "UTF-16LE",
+#if defined(__GLIBC__)
+ "UNICODELITTLE",
+#endif
+ "UCS-2LE",
+#else
+ "UTF-16BE",
+#if defined(__GLIBC__)
+ "UNICODEBIG",
+#endif
+ "UCS-2BE",
+#endif
+ "UTF-16",
+ "UCS-2",
+ "UCS2",
+ "UCS_2",
+ "ucs-2",
+ "ucs2",
+ "ucs_2",
+ NULL
+};
+
+#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
+static const char *UTF_8_NAMES[] = {
+ "UTF-8",
+ "UTF8",
+ "UTF_8",
+ "utf-8",
+ "utf8",
+ "utf_8",
+ NULL
+};
+#endif
+
+static const char *ISO_8859_1_NAMES[] = {
+ "ISO-8859-1",
+#if !defined(__GLIBC__)
+ "ISO8859-1",
+ "ISO88591",
+ "ISO_8859_1",
+ "ISO8859_1",
+ "iso-8859-1",
+ "iso8859-1",
+ "iso88591",
+ "iso_8859_1",
+ "iso8859_1",
+#endif
+ 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(UTF_16_NAMES, native_charset_list);
+ gUnicodeToNative = xp_iconv_open(native_charset_list, UTF_16_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(UTF_16_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 utf-16 converter");
+ }
+ if (gUnicodeToNative == INVALID_ICONV_T) {
+ gUnicodeToUTF8 = xp_iconv_open(UTF_8_NAMES, UTF_16_NAMES);
+ gUTF8ToNative = xp_iconv_open(native_charset_list, UTF_8_NAMES);
+ NS_ASSERTION(gUnicodeToUTF8 != INVALID_ICONV_T, "no utf-16 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 utf-16 converter");
+ NS_ASSERTION(gUnicodeToNative != INVALID_ICONV_T, "no utf-16 to native converter");
+#endif
+
+ /*
+ * On Solaris 8 (and newer?), the iconv modules converting to UCS-2
+ * prepend a byte order mark unicode character (BOM, u+FEFF) during
+ * the first use of the iconv converter. The same is the case of
+ * glibc 2.2.9x and Tru64 V5 (see bug 208809) when 'UTF-16' is used.
+ * However, we use 'UTF-16LE/BE' in both cases, instead so that we
+ * should be safe. But just in case...
+ *
+ * This dummy conversion gets rid of the BOMs and fixes bug 153562.
+ */
+ char dummy_input[1] = { ' ' };
+ char dummy_output[4];
+
+ if (gNativeToUnicode != INVALID_ICONV_T) {
+ const char *input = dummy_input;
+ size_t input_left = sizeof(dummy_input);
+ char *output = dummy_output;
+ size_t output_left = sizeof(dummy_output);
+
+ xp_iconv(gNativeToUnicode, &input, &input_left, &output, &output_left);
+ }
+#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
+ if (gUTF8ToUnicode != INVALID_ICONV_T) {
+ const char *input = dummy_input;
+ size_t input_left = sizeof(dummy_input);
+ char *output = dummy_output;
+ size_t output_left = sizeof(dummy_output);
+
+ xp_iconv(gUTF8ToUnicode, &input, &input_left, &output, &output_left);
+ }
+#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_reset(gNativeToUnicode);
+ if (gUnicodeToNative != INVALID_ICONV_T)
+ xp_iconv_reset(gUnicodeToNative);
+#if defined(ENABLE_UTF8_FALLBACK_SUPPORT)
+ if (gNativeToUTF8 != INVALID_ICONV_T)
+ xp_iconv_reset(gNativeToUTF8);
+ if (gUTF8ToNative != INVALID_ICONV_T)
+ xp_iconv_reset(gUTF8ToNative);
+ if (gUnicodeToUTF8 != INVALID_ICONV_T)
+ xp_iconv_reset(gUnicodeToUTF8);
+ if (gUTF8ToUnicode != INVALID_ICONV_T)
+ xp_iconv_reset(gUTF8ToUnicode);
+#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);
+
+ *inputLeft = inLeft;
+ *outputLeft = outLeft / 2;
+ if (res != (size_t) -1)
+ return NS_OK;
+
+ NS_WARNING("conversion from native to utf-16 failed");
+
+ // reset converter
+ xp_iconv_reset(gNativeToUnicode);
+ }
+#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 utf-16 failed");
+ break;
+ }
+ }
+
+ (*input) += (*inputLeft - inLeft);
+ *inputLeft = inLeft;
+ *outputLeft = outLeft / 2;
+
+ if (res != (size_t) -1)
+ return NS_OK;
+
+ // reset converters
+ xp_iconv_reset(gNativeToUTF8);
+ xp_iconv_reset(gUTF8ToUnicode);
+ }
+#endif
+
+ // fallback: zero-pad and hope for the best
+ // XXX This is lame and we have to do better.
+ isolatin1_to_utf16(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_reset(gUnicodeToNative);
+ }
+#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 utf-16 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_reset(gUnicodeToUTF8);
+ xp_iconv_reset(gUTF8ToNative);
+ }
+#endif
+
+ // fallback: truncate and hope for the best
+ utf16_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_utf16(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 :(
+ utf16_to_isolatin1(input, inputLeft, output, outputLeft);
+ }
+
+ return NS_OK;
+}
+
+#endif // USE_STDCONV
+
+//-----------------------------------------------------------------------------
+// API implementation
+//-----------------------------------------------------------------------------
+
+NS_COM nsresult
+NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
+{
+ output.Truncate();
+
+ PRUint32 inputLen = input.Length();
+
+ nsACString::const_iterator iter;
+ input.BeginReading(iter);
+
+ //
+ // 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;
+
+ const char *buf = iter.get();
+ PRUint32 bufLeft = inputLen;
+
+ nsNativeCharsetConverter conv;
+ nsresult rv = conv.NativeToUnicode(&buf, &bufLeft, &result, &resultLeft);
+ if (NS_SUCCEEDED(rv)) {
+ NS_ASSERTION(bufLeft == 0, "did not consume entire input buffer");
+ output.SetLength(inputLen - resultLeft);
+ }
+ return rv;
+}
+
+NS_COM nsresult
+NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
+{
+ output.Truncate();
+
+ nsAString::const_iterator iter, end;
+ input.BeginReading(iter);
+ input.EndReading(end);
+
+ // cannot easily avoid intermediate buffer copy.
+ char temp[4096];
+
+ nsNativeCharsetConverter conv;
+
+ const PRUnichar *buf = iter.get();
+ PRUint32 bufLeft = Distance(iter, end);
+ while (bufLeft) {
+ char *p = temp;
+ PRUint32 tempLeft = sizeof(temp);
+
+ nsresult 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();
+}
+
+//-----------------------------------------------------------------------------
+// XP_BEOS
+//-----------------------------------------------------------------------------
+#elif defined(XP_BEOS)
+
+#include "nsAString.h"
+#include "nsReadableUtils.h"
+#include "nsString.h"
+
+NS_COM nsresult
+NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
+{
+ CopyUTF8toUTF16(input, output);
+ return NS_OK;
+}
+
+NS_COM nsresult
+NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
+{
+ CopyUTF16toUTF8(input, output);
+ return NS_OK;
+}
+
+void
+NS_StartupNativeCharsetUtils()
+{
+}
+
+void
+NS_ShutdownNativeCharsetUtils()
+{
+}
+
+//-----------------------------------------------------------------------------
+// XP_WIN
+//-----------------------------------------------------------------------------
+#elif defined(XP_WIN)
+
+#include <windows.h>
+#include "nsAString.h"
+
+NS_COM nsresult
+NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
+{
+ PRUint32 inputLen = input.Length();
+
+ nsACString::const_iterator iter;
+ input.BeginReading(iter);
+
+ const char *buf = iter.get();
+
+ // determine length of result
+ PRUint32 resultLen = 0;
+ int n = ::MultiByteToWideChar(CP_ACP, 0, buf, inputLen, NULL, 0);
+ if (n > 0)
+ resultLen += n;
+
+ // allocate sufficient space
+ output.SetLength(resultLen);
+ if (resultLen > 0) {
+ nsAString::iterator out_iter;
+ output.BeginWriting(out_iter);
+
+ PRUnichar *result = out_iter.get();
+
+ ::MultiByteToWideChar(CP_ACP, 0, buf, inputLen, result, resultLen);
+ }
+ return NS_OK;
+}
+
+NS_COM nsresult
+NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
+{
+ PRUint32 inputLen = input.Length();
+
+ nsAString::const_iterator iter;
+ input.BeginReading(iter);
+
+ const PRUnichar *buf = iter.get();
+
+ // determine length of result
+ PRUint32 resultLen = 0;
+
+ int n = ::WideCharToMultiByte(CP_ACP, 0, buf, inputLen, NULL, 0, NULL, NULL);
+ if (n > 0)
+ resultLen += n;
+
+ // allocate sufficient space
+ output.SetLength(resultLen);
+ if (resultLen > 0) {
+ nsACString::iterator out_iter;
+ output.BeginWriting(out_iter);
+
+ // default "defaultChar" is '?', which is an illegal character on windows
+ // file system. That will cause file uncreatable. Change it to '_'
+ const char defaultChar = '_';
+
+ char *result = out_iter.get();
+
+ ::WideCharToMultiByte(CP_ACP, 0, buf, inputLen, result, resultLen,
+ &defaultChar, NULL);
+ }
+ return NS_OK;
+}
+
+void
+NS_StartupNativeCharsetUtils()
+{
+}
+
+void
+NS_ShutdownNativeCharsetUtils()
+{
+}
+
+//-----------------------------------------------------------------------------
+// XP_OS2
+//-----------------------------------------------------------------------------
+#elif defined(XP_OS2)
+
+#define INCL_DOS
+#include <os2.h>
+#include <uconv.h>
+#include "nsAString.h"
+#include <ulserrno.h>
+#include "nsNativeCharsetUtils.h"
+
+static UconvObject UnicodeConverter = NULL;
+
+NS_COM nsresult
+NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
+{
+ PRUint32 inputLen = input.Length();
+
+ nsACString::const_iterator iter;
+ input.BeginReading(iter);
+ const char *inputStr = iter.get();
+
+ // determine length of result
+ PRUint32 resultLen = inputLen;
+ output.SetLength(resultLen);
+
+ nsAString::iterator out_iter;
+ output.BeginWriting(out_iter);
+ UniChar *result = (UniChar*)out_iter.get();
+
+ size_t cSubs = 0;
+ size_t resultLeft = resultLen;
+
+ if (!UnicodeConverter)
+ NS_StartupNativeCharsetUtils();
+
+ int unirc = ::UniUconvToUcs(UnicodeConverter, (void**)&inputStr, &inputLen,
+ &result, &resultLeft, &cSubs);
+
+ NS_ASSERTION(unirc != UCONV_E2BIG, "Path too big");
+
+ if (unirc != ULS_SUCCESS) {
+ output.Truncate();
+ return NS_ERROR_FAILURE;
+ }
+
+ // Need to update string length to reflect how many bytes were actually
+ // written.
+ output.Truncate(resultLen - resultLeft);
+ return NS_OK;
+}
+
+NS_COM nsresult
+NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
+{
+ size_t inputLen = input.Length();
+
+ nsAString::const_iterator iter;
+ input.BeginReading(iter);
+ UniChar* inputStr = (UniChar*) NS_CONST_CAST(PRUnichar*, iter.get());
+
+ // maximum length of unicode string of length x converted to native
+ // codepage is x*2
+ size_t resultLen = inputLen * 2;
+ output.SetLength(resultLen);
+
+ nsACString::iterator out_iter;
+ output.BeginWriting(out_iter);
+ char *result = out_iter.get();
+
+ size_t cSubs = 0;
+ size_t resultLeft = resultLen;
+
+ if (!UnicodeConverter)
+ NS_StartupNativeCharsetUtils();
+
+ int unirc = ::UniUconvFromUcs(UnicodeConverter, &inputStr, &inputLen,
+ (void**)&result, &resultLeft, &cSubs);
+
+ NS_ASSERTION(unirc != UCONV_E2BIG, "Path too big");
+
+ if (unirc != ULS_SUCCESS) {
+ output.Truncate();
+ return NS_ERROR_FAILURE;
+ }
+
+ // Need to update string length to reflect how many bytes were actually
+ // written.
+ output.Truncate(resultLen - resultLeft);
+ return NS_OK;
+}
+
+void
+NS_StartupNativeCharsetUtils()
+{
+ ULONG ulLength;
+ ULONG ulCodePage;
+ DosQueryCp(sizeof(ULONG), &ulCodePage, &ulLength);
+
+ UniChar codepage[20];
+ int unirc = ::UniMapCpToUcsCp(ulCodePage, codepage, 20);
+ if (unirc == ULS_SUCCESS) {
+ unirc = ::UniCreateUconvObject(codepage, &UnicodeConverter);
+ if (unirc == ULS_SUCCESS) {
+ uconv_attribute_t attr;
+ ::UniQueryUconvObject(UnicodeConverter, &attr, sizeof(uconv_attribute_t),
+ NULL, NULL, NULL);
+ attr.options = UCONV_OPTION_SUBSTITUTE_BOTH;
+ attr.subchar_len=1;
+ attr.subchar[0]='_';
+ ::UniSetUconvObject(UnicodeConverter, &attr);
+ }
+ }
+}
+
+void
+NS_ShutdownNativeCharsetUtils()
+{
+ ::UniFreeUconvObject(UnicodeConverter);
+}
+
+//-----------------------------------------------------------------------------
+// XP_MAC
+//-----------------------------------------------------------------------------
+#elif defined(XP_MAC)
+
+#include <UnicodeConverter.h>
+#include <TextCommon.h>
+#include <Script.h>
+#include <MacErrors.h>
+#include "nsAString.h"
+
+class nsFSStringConversionMac {
+public:
+ static nsresult UCSToFS(const nsAString& aIn, nsACString& aOut);
+ static nsresult FSToUCS(const nsACString& ain, nsAString& aOut);
+
+ static void CleanUp();
+
+private:
+ static TextEncoding GetSystemEncoding();
+ static nsresult PrepareEncoder();
+ static nsresult PrepareDecoder();
+
+ static UnicodeToTextInfo sEncoderInfo;
+ static TextToUnicodeInfo sDecoderInfo;
+};
+
+UnicodeToTextInfo nsFSStringConversionMac::sEncoderInfo = nsnull;
+TextToUnicodeInfo nsFSStringConversionMac::sDecoderInfo = nsnull;
+
+nsresult nsFSStringConversionMac::UCSToFS(const nsAString& aIn, nsACString& aOut)
+{
+ nsresult rv = PrepareEncoder();
+ if (NS_FAILED(rv)) return rv;
+
+ OSStatus err = noErr;
+ char stackBuffer[512];
+
+ aOut.Truncate();
+
+ // for each chunk of |aIn|...
+ nsReadingIterator<PRUnichar> iter;
+ aIn.BeginReading(iter);
+
+ PRUint32 fragmentLength = PRUint32(iter.size_forward());
+ UInt32 bytesLeft = fragmentLength * sizeof(UniChar);
+
+ do {
+ UInt32 bytesRead = 0, bytesWritten = 0;
+ err = ::ConvertFromUnicodeToText(sEncoderInfo,
+ bytesLeft,
+ (const UniChar*)iter.get(),
+ kUnicodeUseFallbacksMask | kUnicodeLooseMappingsMask,
+ 0, nsnull, nsnull, nsnull,
+ sizeof(stackBuffer),
+ &bytesRead,
+ &bytesWritten,
+ stackBuffer);
+ if (err == kTECUsedFallbacksStatus)
+ err = noErr;
+ else if (err == kTECOutputBufferFullStatus) {
+ bytesLeft -= bytesRead;
+ iter.advance(bytesRead / sizeof(UniChar));
+ }
+ aOut.Append(stackBuffer, bytesWritten);
+ }
+ while (err == kTECOutputBufferFullStatus);
+
+ return (err == noErr) ? NS_OK : NS_ERROR_FAILURE;
+}
+
+nsresult nsFSStringConversionMac::FSToUCS(const nsACString& aIn, nsAString& aOut)
+{
+ nsresult rv = PrepareDecoder();
+ if (NS_FAILED(rv)) return rv;
+
+ OSStatus err = noErr;
+ UniChar stackBuffer[512];
+
+ aOut.Truncate(0);
+
+ // for each chunk of |aIn|...
+ nsReadingIterator<char> iter;
+ aIn.BeginReading(iter);
+
+ PRUint32 fragmentLength = PRUint32(iter.size_forward());
+ UInt32 bytesLeft = fragmentLength;
+
+ do {
+ UInt32 bytesRead = 0, bytesWritten = 0;
+ err = ::ConvertFromTextToUnicode(sDecoderInfo,
+ bytesLeft,
+ iter.get(),
+ kUnicodeUseFallbacksMask | kUnicodeLooseMappingsMask,
+ 0, nsnull, nsnull, nsnull,
+ sizeof(stackBuffer),
+ &bytesRead,
+ &bytesWritten,
+ stackBuffer);
+ if (err == kTECUsedFallbacksStatus)
+ err = noErr;
+ else if (err == kTECOutputBufferFullStatus) {
+ bytesLeft -= bytesRead;
+ iter.advance(bytesRead);
+ }
+ aOut.Append((PRUnichar *)stackBuffer, bytesWritten / sizeof(PRUnichar));
+ }
+ while (err == kTECOutputBufferFullStatus);
+
+ return (err == noErr) ? NS_OK : NS_ERROR_FAILURE;
+}
+
+void nsFSStringConversionMac::CleanUp()
+{
+ if (sDecoderInfo) {
+ ::DisposeTextToUnicodeInfo(&sDecoderInfo);
+ sDecoderInfo = nsnull;
+ }
+ if (sEncoderInfo) {
+ ::DisposeUnicodeToTextInfo(&sEncoderInfo);
+ sEncoderInfo = nsnull;
+ }
+}
+
+TextEncoding nsFSStringConversionMac::GetSystemEncoding()
+{
+ OSStatus err;
+ TextEncoding theEncoding;
+
+ err = ::UpgradeScriptInfoToTextEncoding(smSystemScript, kTextLanguageDontCare,
+ kTextRegionDontCare, NULL, &theEncoding);
+
+ if (err != noErr)
+ theEncoding = kTextEncodingMacRoman;
+
+ return theEncoding;
+}
+
+nsresult nsFSStringConversionMac::PrepareEncoder()
+{
+ nsresult rv = NS_OK;
+ if (!sEncoderInfo) {
+ OSStatus err;
+ err = ::CreateUnicodeToTextInfoByEncoding(GetSystemEncoding(), &sEncoderInfo);
+ if (err)
+ rv = NS_ERROR_FAILURE;
+ }
+ return rv;
+}
+
+nsresult nsFSStringConversionMac::PrepareDecoder()
+{
+ nsresult rv = NS_OK;
+ if (!sDecoderInfo) {
+ OSStatus err;
+ err = ::CreateTextToUnicodeInfoByEncoding(GetSystemEncoding(), &sDecoderInfo);
+ if (err)
+ rv = NS_ERROR_FAILURE;
+ }
+ return rv;
+}
+
+NS_COM nsresult
+NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
+{
+ return nsFSStringConversionMac::FSToUCS(input, output);
+}
+
+NS_COM nsresult
+NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
+{
+ return nsFSStringConversionMac::UCSToFS(input, output);
+}
+
+void
+NS_StartupNativeCharsetUtils()
+{
+}
+
+void
+NS_ShutdownNativeCharsetUtils()
+{
+ nsFSStringConversionMac::CleanUp();
+}
+
+//-----------------------------------------------------------------------------
+// default : truncate/zeropad
+//-----------------------------------------------------------------------------
+#else
+
+#include "nsReadableUtils.h"
+
+NS_COM nsresult
+NS_CopyNativeToUnicode(const nsACString &input, nsAString &output)
+{
+ CopyASCIItoUCS2(input, output);
+ return NS_OK;
+}
+
+NS_COM nsresult
+NS_CopyUnicodeToNative(const nsAString &input, nsACString &output)
+{
+ CopyUCS2toASCII(input, output);
+ return NS_OK;
+}
+
+void
+NS_StartupNativeCharsetUtils()
+{
+}
+
+void
+NS_ShutdownNativeCharsetUtils()
+{
+}
+
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-04 12:25:29 +0000