mirror of https://github.com/odrling/Aegisub
441 lines
15 KiB
C++
441 lines
15 KiB
C++
// Copyright (c) 2009, Thomas Goyne
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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//
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// $Id$
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/// @file charset_conv.cpp
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/// @brief Iconv-based implementation of character set conversions
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/// @ingroup utility
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///
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#include "charset_conv.h"
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#include <stdint.h>
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#include <errno.h>
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#include <wx/hashmap.h>
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#include <wx/intl.h>
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WX_DECLARE_STRING_HASH_MAP(wxString, PrettyNamesHash);
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#if wxUSE_THREADS
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static wxMutex encodingListMutex;
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#endif
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static const iconv_t iconv_invalid = (iconv_t)-1;
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static const size_t iconv_failed = (size_t)-1;
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#define ICONV_CONST_CAST(a) const_cast<ICONV_CONST char *>(a)
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#ifndef ICONV_POSIX
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static int addEncoding(unsigned int namescount, const char * const * names, void* data);
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#endif
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static wxArrayString *supportedEncodings = NULL;
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static wxArrayString *prettyEncodingList = NULL;
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static PrettyNamesHash *prettyEncodingHash = NULL;
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AegisubCSConv::AegisubCSConv(const wxChar *mbEncName, bool enableSubst)
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: mbCharsetName(GetRealEncodingName(mbEncName)), mbNulLen(0), enableSubst(enableSubst)
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{
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wcCharsetName = wxString::FromAscii(WCHAR_T_ENCODING);
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m2w = iconv_open(wcCharsetName.ToAscii(), mbCharsetName.ToAscii());
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w2m = iconv_open(mbCharsetName.ToAscii(), wcCharsetName.ToAscii());
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if (m2w == iconv_invalid || w2m == iconv_invalid) {
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if (m2w != iconv_invalid) iconv_close(m2w);
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if (w2m != iconv_invalid) iconv_close(w2m);
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throw wxString::Format(_T("Character set %s is not supported."), mbEncName);
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}
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if (enableSubst) {
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invalidRepSize = FromWChar(invalidRep, sizeof(invalidRep), L"?") - GetMBNulLen();
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#ifndef ICONV_POSIX
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fallbacks.data = this;
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fallbacks.mb_to_uc_fallback = NULL;
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fallbacks.mb_to_wc_fallback = NULL;
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fallbacks.uc_to_mb_fallback = ucToMbFallback;
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fallbacks.wc_to_mb_fallback = NULL;
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#endif
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}
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}
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AegisubCSConv::~AegisubCSConv() {
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if (m2w != iconv_invalid) iconv_close(m2w);
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if (w2m != iconv_invalid) iconv_close(w2m);
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}
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wxMBConv * AegisubCSConv::Clone() const {
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AegisubCSConv *c = new AegisubCSConv(mbCharsetName);
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c->mbNulLen = mbNulLen;
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return c;
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}
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// Calculate the size of NUL in the target encoding via iconv
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size_t AegisubCSConv::GetMBNulLen() const {
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if (mbNulLen == 0) {
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const wchar_t nulStr[] = L"";
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char outBuff[8];
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size_t inLen = sizeof(wchar_t);
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size_t outLen = sizeof(outBuff);
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char * inPtr = (char *)nulStr;
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char * outPtr = outBuff;
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size_t res = iconv(w2m, &inPtr, &inLen, &outPtr, &outLen);
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if (res != 0)
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const_cast<AegisubCSConv *>(this)->mbNulLen = (size_t)-1;
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else
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const_cast<AegisubCSConv *>(this)->mbNulLen = sizeof(outBuff) - outLen;
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}
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return mbNulLen;
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}
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// Calculate the length (in bytes) of a MB string, not including the terminator
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size_t AegisubCSConv::MBBuffLen(const char * str) const {
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size_t nulLen = GetMBNulLen();
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const char *ptr;
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switch (nulLen) {
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case 1:
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return strlen(str);
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case 2:
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for (ptr = str; *reinterpret_cast<const uint16_t *>(ptr) != 0; ptr += 2) ;
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return ptr - str;
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case 4:
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for (ptr = str; *reinterpret_cast<const uint32_t *>(ptr) != 0; ptr += 4) ;
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return ptr - str;
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default:
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return (size_t)-1;
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}
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}
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size_t AegisubCSConv::ToWChar(wchar_t *dst, size_t dstSize, const char *src, size_t srcLen) const {
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return doConversion(
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m2w,
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reinterpret_cast<char *>(dst),
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dstSize * sizeof(wchar_t),
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const_cast<char *>(src),
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srcLen == wxNO_LEN ? MBBuffLen(src) + GetMBNulLen() : srcLen
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) / sizeof(wchar_t);
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}
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size_t AegisubCSConv::FromWChar(char *dst, size_t dstSize, const wchar_t *src, size_t srcLen) const {
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return doConversion(
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w2m,
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dst,
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dstSize,
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reinterpret_cast<char *>(const_cast<wchar_t *>(src)),
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(srcLen == wxNO_LEN ? wcslen(src) + 1 : srcLen) * sizeof(wchar_t)
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);
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}
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size_t AegisubCSConv::doConversion(iconv_t cd, char *dst, size_t dstSize, char *src, size_t srcSize) const {
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if (dstSize > 0) {
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return iconvWrapper(cd, &src, &srcSize, &dst, &dstSize);
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}
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// No destination given, so calculate the needed buffer size instead
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char buff[32];
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size_t buffSize = 32;
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size_t charsWritten = 0;
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size_t res;
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do {
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dst = buff;
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dstSize = buffSize;
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res = iconvWrapper(cd, &src, &srcSize, &dst, &dstSize);
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charsWritten += dst - buff;
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} while (res == iconv_failed && errno == E2BIG);
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if (res == iconv_failed) return wxCONV_FAILED;
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return charsWritten;
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}
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size_t AegisubCSConv::iconvWrapper(iconv_t cd, char **inbuf, size_t *inbytesleft,
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char **outbuf, size_t *outbytesleft) const {
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#if wxUSE_THREADS
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wxMutexLocker lock(const_cast<AegisubCSConv *>(this)->iconvMutex);
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#endif
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char *outbuforig = *outbuf;
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size_t res = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
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if (res != iconv_failed)
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return *outbuf - outbuforig;
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if (!enableSubst)
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return iconv_failed;
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#ifdef ICONV_POSIX
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if (errno == EILSEQ) {
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throw _T("One or more characters do not fit in the selected ")
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_T("encoding and the version of iconv Aegisub was built with")
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_T(" does not have useful fallbacks. For best results, ")
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_T("please rebuild Aegisub using a recent version of GNU iconv.");
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}
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return wxCONV_FAILED;
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#else
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// Save original errno so we can return it rather than the result from iconvctl
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int err = errno;
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// Some characters in the input string do not exist in the output encoding
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if (res == iconv_failed && err == EILSEQ) {
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// first try transliteration only
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int transliterate = 1;
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iconvctl(cd, ICONV_SET_TRANSLITERATE, &transliterate);
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res = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
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err = errno;
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transliterate = 0;
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iconvctl(cd, ICONV_SET_TRANSLITERATE, &transliterate);
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}
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if (res == iconv_failed && err == EILSEQ) {
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// Conversion still failed with transliteration enabled, so try our substitution
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iconvctl(cd, ICONV_SET_FALLBACKS, const_cast<iconv_fallbacks *>(&fallbacks));
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res = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
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err = errno;
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iconvctl(cd, ICONV_SET_FALLBACKS, NULL);
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}
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if (res == iconv_failed && err == EILSEQ) {
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// Conversion still failed, so just drop any invalid characters
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int discard = 1;
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iconvctl(cd, ICONV_SET_DISCARD_ILSEQ, &discard);
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res = iconv(cd, inbuf, inbytesleft, outbuf, outbytesleft);
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err = errno;
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discard = 0;
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iconvctl(cd, ICONV_SET_DISCARD_ILSEQ, &discard);
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}
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errno = err;
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if (res == iconv_failed) return wxCONV_FAILED;
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return *outbuf - outbuforig;
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#endif
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}
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void AegisubCSConv::ucToMbFallback(
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unsigned int code,
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void (*callback) (const char *buf, size_t buflen, void* callback_arg),
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void *callback_arg,
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void *convPtr)
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{
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// At some point in the future, this should probably switch to a real mapping
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// For now, there's just three cases: BOM to nothing, \ to itself (lol Shift-JIS) and everything else to ?
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if (code == 0xFEFF) return;
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if (code == 0x5C) callback("\\", 1, callback_arg);
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else {
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AegisubCSConv *self = static_cast<AegisubCSConv *>(convPtr);
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callback(self->invalidRep, self->invalidRepSize, callback_arg);
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}
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}
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#ifndef ICONV_POSIX
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int addEncoding(unsigned int namescount, const char * const * names, void* data) {
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for (unsigned int i = 0; i < namescount; i++) {
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supportedEncodings->Add(wxString::FromAscii(names[i]));
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}
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return 0;
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}
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#endif
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wxArrayString AegisubCSConv::GetAllSupportedEncodings() {
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#if wxUSE_THREADS
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wxMutexLocker lock(encodingListMutex);
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#endif
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if (supportedEncodings == NULL) {
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supportedEncodings = new wxArrayString();
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#ifndef ICONV_POSIX
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iconvlist(addEncoding, NULL);
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supportedEncodings->Sort();
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#endif
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}
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return *supportedEncodings;
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}
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// Map pretty names to the real encoding names
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wxString AegisubCSConv::GetRealEncodingName(wxString name) {
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if (name.Lower() == _T("local")) return wxLocale::GetSystemEncodingName();
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if (prettyEncodingList == NULL) return name;
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PrettyNamesHash::iterator realName = prettyEncodingHash->find(name);
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if (realName != prettyEncodingHash->end()) {
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return realName->second;
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}
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return name;
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}
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wxArrayString AegisubCSConv::GetEncodingsList() {
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#if wxUSE_THREADS
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wxMutexLocker lock(encodingListMutex);
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#endif
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if (prettyEncodingList == NULL) {
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struct { const char *pretty, *real; } encodingNames[] = {
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{"Unicode (UTF-8)", "utf-8"},
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{"Unicode (UTF-16)", "utf-16"},
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{"Unicode (UTF-16BE)", "utf-16be"},
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{"Unicode (UTF-16LE)", "utf-16le"},
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{"Unicode (UTF-32)", "utf-32"},
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{"Unicode (UTF-32BE)", "utf-32be"},
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{"Unicode (UTF-32LE)", "utf-32le"},
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{"Unicode (UTF-7)", "utf-7"},
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{"Arabic (IBM-864)", "ibm864"},
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{"Arabic (IBM-864-I)", "ibm864i"},
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{"Arabic (ISO-8859-6)", "iso-8859-6"},
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{"Arabic (ISO-8859-6-E)", "iso-8859-6-e"},
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{"Arabic (ISO-8859-6-I)", "iso-8859-6-i"},
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{"Arabic (Langbox ISO-8859-6.16)", "x-iso-8859-6-16"},
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{"Arabic (Langbox ISO-8859-6.8x)", "x-iso-8859-6-8-x"},
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{"Arabic (MacArabic)", "x-mac-arabic"},
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{"Arabic (Windows-1256)", "windows-1256"},
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{"Armenian (ARMSCII-8)", "armscii-8"},
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{"Baltic (ISO-8859-13)", "iso-8859-13"},
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{"Baltic (ISO-8859-4)", "iso-8859-4"},
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{"Baltic (Windows-1257)", "windows-1257"},
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{"Celtic (ISO-8859-14)", "iso-8859-14"},
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{"Central European (IBM-852)", "ibm852"},
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{"Central European (ISO-8859-2)", "iso-8859-2"},
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{"Central European (MacCE)", "x-mac-ce"},
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{"Central European (Windows-1250)", "windows-1250"},
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{"Chinese Simplified (GB18030)", "gb18030"},
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{"Chinese Simplified (GB2312)", "gb2312"},
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{"Chinese Simplified (GBK)", "x-gbk"},
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{"Chinese Simplified (HZ)", "hz-gb-2312"},
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{"Chinese Simplified (ISO-2022-CN)", "iso-2022-cn"},
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{"Chinese Traditional (Big5)", "big5"},
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{"Chinese Traditional (Big5-HKSCS)", "big5-hkscs"},
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{"Chinese Traditional (EUC-TW)", "x-euc-tw"},
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{"Croatian (MacCroatian)", "x-mac-croatian"},
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{"Cyrillic (IBM-855)", "ibm855"},
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{"Cyrillic (ISO-8859-5)", "iso-8859-5"},
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{"Cyrillic (ISO-IR-111)", "iso-ir-111"},
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{"Cyrillic (KOI8-R)", "koi8-r"},
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{"Cyrillic (MacCyrillic)", "x-mac-cyrillic"},
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{"Cyrillic (Windows-1251)", "windows-1251"},
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{"Cyrillic/Russian (CP-866)", "ibm866"},
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{"Cyrillic/Ukrainian (KOI8-U)", "koi8-u"},
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{"Cyrillic/Ukrainian (MacUkrainian)", "x-mac-ukrainian"},
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{"English (US-ASCII)", "us-ascii"},
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{"Farsi (MacFarsi)", "x-mac-farsi"},
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{"Georgian (GEOSTD8)", "geostd8"},
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{"Greek (ISO-8859-7)", "iso-8859-7"},
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{"Greek (MacGreek)", "x-mac-greek"},
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{"Greek (Windows-1253)", "windows-1253"},
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{"Gujarati (MacGujarati)", "x-mac-gujarati"},
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{"Gurmukhi (MacGurmukhi)", "x-mac-gurmukhi"},
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{"Hebrew (IBM-862)", "ibm862"},
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{"Hebrew (ISO-8859-8-E)", "iso-8859-8-e"},
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{"Hebrew (ISO-8859-8-I)", "iso-8859-8-i"},
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{"Hebrew (MacHebrew)", "x-mac-hebrew"},
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{"Hebrew (Windows-1255)", "windows-1255"},
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{"Hebrew Visual (ISO-8859-8)", "iso-8859-8"},
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{"Hindi (MacDevanagari)", "x-mac-devanagari"},
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{"Hindi (SunDevanagari)", "x-sun-unicode-india-0"},
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{"Icelandic (MacIcelandic)", "x-mac-icelandic"},
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{"Japanese (EUC-JP)", "euc-jp"},
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{"Japanese (ISO-2022-JP)", "iso-2022-jp"},
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{"Japanese (Shift_JIS)", "shift_jis"},
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{"Korean (EUC-KR)", "euc-kr"},
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{"Korean (ISO-2022-KR)", "iso-2022-kr"},
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{"Korean (JOHAB)", "x-johab"},
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{"Korean (UHC)", "x-windows-949"},
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{"Nordic (ISO-8859-10)", "iso-8859-10"},
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{"Romanian (ISO-8859-16)", "iso-8859-16"},
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{"Romanian (MacRomanian)", "x-mac-romanian"},
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{"South European (ISO-8859-3)", "iso-8859-3"},
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{"Thai (IBM-874)", "ibm874"},
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{"Thai (ISO-8859-11)", "iso-8859-11"},
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{"Thai (TIS-620)", "tis-620"},
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{"Thai (Windows-874)", "windows-874"},
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{"Turkish (IBM-857)", "ibm857"},
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{"Turkish (ISO-8859-9)", "iso-8859-9"},
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{"Turkish (MacTurkish)", "x-mac-turkish"},
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{"Turkish (Windows-1254)", "windows-1254"},
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{"Vietnamese (TCVN)", "x-viet-tcvn5712"},
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{"Vietnamese (VISCII)", "viscii"},
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{"Vietnamese (VPS)", "x-viet-vps"},
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{"Vietnamese (Windows-1258)", "windows-1258"},
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{"Western (IBM-850)", "ibm850"},
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{"Western (ISO-8859-1)", "iso-8859-1"},
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{"Western (ISO-8859-15)", "iso-8859-15"},
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{"Western (MacRoman)", "x-mac-roman"},
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{"Western (Windows-1252)", "windows-1252"},
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{NULL, NULL}
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};
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PrettyNamesHash *map = new PrettyNamesHash(100);
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wxArrayString *arr = new wxArrayString();
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arr->Add(_T("Local"));
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for (int i = 0; encodingNames[i].real != NULL; i++) {
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// Verify that iconv actually supports this encoding
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iconv_t cd = iconv_open(encodingNames[i].real, WCHAR_T_ENCODING);
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if (cd == iconv_invalid) continue;
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iconv_close(cd);
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cd = iconv_open(WCHAR_T_ENCODING, encodingNames[i].real);
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if (cd == iconv_invalid) continue;
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iconv_close(cd);
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wxString pretty = wxString::FromAscii(encodingNames[i].pretty);
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arr->Add(pretty);
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(*map)[pretty] = wxString::FromAscii(encodingNames[i].real);
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}
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prettyEncodingList = arr;
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prettyEncodingHash = map;
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}
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return *prettyEncodingList;
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}
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static AegisubCSConv localConv(_T("Local"), false);
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AegisubCSConv& csConvLocal(localConv);
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