/****************************************************************************** * * scsuutf8.cpp - SWFilter descendant to convert a SCSU character to * UTF-8 * * $Id$ * * Copyright 2001-2014 CrossWire Bible Society (http://www.crosswire.org) * CrossWire Bible Society * P. O. Box 2528 * Tempe, AZ 85280-2528 * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * */ /* This class is based on: * http://czyborra.com/scsu/scsu.c written by Roman Czyborra@dds.nl * * This is a deflator to UTF-8 output for input compressed in SCSU, * the (Reuters) Standard Compression Scheme for Unicode as described * in http://www.unicode.org/unicode/reports/tr6.html */ #include #include #ifdef _ICU_ #include #endif SWORD_NAMESPACE_START SCSUUTF8::SCSUUTF8() #ifdef _ICU_ : err() #endif { #ifdef _ICU_ // initialize SCSU converter scsuConv = ucnv_open("SCSU", &err); // initialize UTF-8 converter utf8Conv = ucnv_open("UTF-8", &err); #else active = 0; mode = 0; #endif } SCSUUTF8::~SCSUUTF8() { #ifdef _ICU_ ucnv_close(scsuConv); ucnv_close(utf8Conv); #endif } #ifndef _ICU_ unsigned short SCSUUTF8::start[] = {0x0000,0x0080,0x0100,0x0300,0x2000,0x2080,0x2100,0x3000}; unsigned short SCSUUTF8::slide[] = {0x0080,0x00C0,0x0400,0x0600,0x0900,0x3040,0x30A0,0xFF00}; unsigned short SCSUUTF8::win[] = { 0x0000, 0x0080, 0x0100, 0x0180, 0x0200, 0x0280, 0x0300, 0x0380, 0x0400, 0x0480, 0x0500, 0x0580, 0x0600, 0x0680, 0x0700, 0x0780, 0x0800, 0x0880, 0x0900, 0x0980, 0x0A00, 0x0A80, 0x0B00, 0x0B80, 0x0C00, 0x0C80, 0x0D00, 0x0D80, 0x0E00, 0x0E80, 0x0F00, 0x0F80, 0x1000, 0x1080, 0x1100, 0x1180, 0x1200, 0x1280, 0x1300, 0x1380, 0x1400, 0x1480, 0x1500, 0x1580, 0x1600, 0x1680, 0x1700, 0x1780, 0x1800, 0x1880, 0x1900, 0x1980, 0x1A00, 0x1A80, 0x1B00, 0x1B80, 0x1C00, 0x1C80, 0x1D00, 0x1D80, 0x1E00, 0x1E80, 0x1F00, 0x1F80, 0x2000, 0x2080, 0x2100, 0x2180, 0x2200, 0x2280, 0x2300, 0x2380, 0x2400, 0x2480, 0x2500, 0x2580, 0x2600, 0x2680, 0x2700, 0x2780, 0x2800, 0x2880, 0x2900, 0x2980, 0x2A00, 0x2A80, 0x2B00, 0x2B80, 0x2C00, 0x2C80, 0x2D00, 0x2D80, 0x2E00, 0x2E80, 0x2F00, 0x2F80, 0x3000, 0x3080, 0x3100, 0x3180, 0x3200, 0x3280, 0x3300, 0x3800, 0xE000, 0xE080, 0xE100, 0xE180, 0xE200, 0xE280, 0xE300, 0xE380, 0xE400, 0xE480, 0xE500, 0xE580, 0xE600, 0xE680, 0xE700, 0xE780, 0xE800, 0xE880, 0xE900, 0xE980, 0xEA00, 0xEA80, 0xEB00, 0xEB80, 0xEC00, 0xEC80, 0xED00, 0xED80, 0xEE00, 0xEE80, 0xEF00, 0xEF80, 0xF000, 0xF080, 0xF100, 0xF180, 0xF200, 0xF280, 0xF300, 0xF380, 0xF400, 0xF480, 0xF500, 0xF580, 0xF600, 0xF680, 0xF700, 0xF780, 0xF800, 0xF880, 0xF900, 0xF980, 0xFA00, 0xFA80, 0xFB00, 0xFB80, 0xFC00, 0xFC80, 0xFD00, 0xFD80, 0xFE00, 0xFE80, 0xFF00, 0xFF80, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x00C0, 0x0250, 0x0370, 0x0530, 0x3040, 0x30A0, 0xFF60, }; int SCSUUTF8::UTF8Output(unsigned long uchar, SWBuf* utf8Buf) { // join UTF-16 surrogates without any pairing sanity checks if (uchar >= 0xd800 && uchar <= 0xdbff) { d = uchar & 0x3ff; return 0; } if (uchar >= 0xdc00 && uchar <= 0xdfff) { uchar = uchar + 0x2400 + d * 0x400; } // output one character as UTF-8 multibyte sequence if (uchar < 0x80) { utf8Buf += uchar; } else if (uchar < 0x800) { utf8Buf += (0xc0 | (uchar>>6)); utf8Buf += (0x80 | (uchar & 0x3f)); } else if (uchar < 0x10000) { utf8Buf += (0xe0 | (uchar>>12)); utf8Buf += (0x80 | (uchar>>6 & 0x3f)); utf8Buf += (0x80 | (uchar & 0x3f)); } else if (uchar < 0x200000) { utf8Buf += (0xf0 | (uchar>>18)); utf8Buf += (0x80 | (uchar>>12 & 0x3f)); utf8Buf += (0x80 | (uchar>>6 & 0x3f)); utf8Buf += (0x80 | (uchar & 0x3f)); } return 0; } #endif char SCSUUTF8::processText(SWBuf &text, const SWKey *key, const SWModule *module) { if ((unsigned long)key < 2) // hack, we're en(1)/de(0)ciphering return -1; #ifdef _ICU_ // Try decoding with ICU if possible err = U_ZERO_ERROR; icu::UnicodeString utf16Text(text.getRawData(), text.length(), scsuConv, err); err = U_ZERO_ERROR; int32_t len = utf16Text.extract(text.getRawData(), text.size(), utf8Conv, err); if (len > (int32_t)text.size()+1) { text.setSize(len+1); utf16Text.extract(text.getRawData(), text.size(), utf8Conv, err); } #else // If ICU is unavailable, decode using Czyborra's decoder SWBuf utf8Buf = ""; int len = text.length(); const char* scsuString = text.c_str(); for (int i = 0; i < len;) { if (i >= len) break; c = scsuString[i++]; if (c >= 0x80) { UTF8Output(c - 0x80 + slide[active], &utf8Buf); } else if (c >= 0x20 && c <= 0x7F) { UTF8Output(c, &utf8Buf); } else if (c == 0x0 || c == 0x9 || c == 0xA || c == 0xC || c == 0xD) { UTF8Output(c, &utf8Buf); } else if (c >= 0x1 && c <= 0x8) // SQn { if (i >= len) break; d = scsuString[i++]; // single quote UTF8Output(d < 0x80 ? d + start[c - 0x1] : d - 0x80 + slide[c - 0x1], &utf8Buf); } else if (c >= 0x10 && c <= 0x17) // SCn { active = c - 0x10; // change window } else if (c >= 0x18 && c <= 0x1F) // SDn { active = c - 0x18; // define window if (i >= len) break; slide[active] = win[(unsigned char)scsuString[i++]]; } else if (c == 0xB) // SDX { if (i >= len) break; c = scsuString[i++]; if (i >= len) break; d = scsuString[i++]; slide[active = c>>5] = 0x10000 + (((c & 0x1F) << 8 | d) << 7); } else if (c == 0xE) // SQU { if (i >= len) break; c = scsuString[i++]; // SQU if (i >= len) break; UTF8Output(c << 8 | scsuString[i++], &utf8Buf); } else if (c == 0xF) // SCU { mode = 1; // change to Unicode mode while (mode) { if (i >= len) break; c = scsuString[i++]; if (c <= 0xDF || c >= 0xF3) { if (i >= len) break; UTF8Output(c << 8 | scsuString[i++], &utf8Buf); } else if (c == 0xF0) // UQU { if (i >= len) break; c = scsuString[i++]; if (i >= len) break; UTF8Output(c << 8 | scsuString[i++], &utf8Buf); } else if (c >= 0xE0 && c <= 0xE7) // UCn { active = c - 0xE0; mode = 0; } else if (c >= 0xE8 && c <= 0xEF) // UDn { if (i >= len) break; slide[active=c-0xE8] = win[(unsigned char)scsuString[i++]]; mode = 0; } else if (c == 0xF1) // UDX { if (i >= len) break; c = scsuString[i++]; if (i >= len) break; d = scsuString[i++]; slide[active = c>>5] = 0x10000 + (((c & 0x1F) << 8 | d) << 7); mode = 0; } } } } #endif return 0; } SWORD_NAMESPACE_END