/******************************************************************************
*
* SCSUUTF8 - SWFilter decendant to convert a SCSU character to UTF-8
*
*/
/* This class is based on:
* http://czyborra.com/scsu/scsu.c written by Roman Czyborra@dds.nl
* on Andrea's balcony in North Amsterdam on 1998-08-04
* Thanks to Richard Verhoeven <rcb5@win.tue.nl> for his suggestion
* to correct the haphazard "if" after UQU to "else if" on 1998-10-01
*
* 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 <stdlib.h>
#include <stdio.h>
#include <swmodule.h>
#include <scsuutf8.h>
SCSUUTF8::SCSUUTF8() {
}
unsigned char* SCSUUTF8::UTF8Output(unsigned long uchar, unsigned char* text)
{
/* join UTF-16 surrogates without any pairing sanity checks */
static int d;
if (uchar >= 0xd800 && uchar <= 0xdbff) { d = uchar & 0x3f; return text; }
if (uchar >= 0xdc00 && uchar <= 0xdfff) { uchar = uchar + 0x2400 + d * 0x400; }
/* output one character as UTF-8 multibyte sequence */
if (uchar < 0x80) {
*text++ = c;
}
else if (uchar < 0x800) {
*text++ = 0xc0 | uchar >> 6;
*text++ = 0x80 | uchar & 0x3f;
}
else if (uchar < 0x10000) {
*text++ = 0xe0 | uchar >> 12;
*text++ = 0x80 | uchar >> 6 & 0x3f;
*text++ = 0x80 | uchar & 0x3f;
}
else if (uchar < 0x200000) {
*text++ = 0xf0 | uchar >> 18;
*text++ = 0x80 | uchar >> 12 & 0x3f;
*text++ = 0x80 | uchar >> 6 & 0x3f;
*text++ = 0x80 | uchar & 0x3f;
}
return text;
}
char SCSUUTF8::ProcessText(char *text, int len, const SWKey *key, const SWModule *module)
{
unsigned char *to, *from;
unsigned long buflen = len * FILTERPAD;
char active = 0, mode = 0;
if ((unsigned long)key < 2) // hack, we're en(1)/de(0)ciphering
return -1;
static unsigned short start[8] = {0x0000,0x0080,0x0100,0x0300,0x2000,0x2080,0x2100,0x3000};
static unsigned short slide[8] = {0x0080,0x00C0,0x0400,0x0600,0x0900,0x3040,0x30A0,0xFF00};
static unsigned short win[256] = {
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
};
if (!len)
return 0;
memmove(&text[buflen - len], text, len);
from = (unsigned char*)&text[buflen - len];
to = (unsigned char *)text;
// -------------------------------
for (int i = 0; i < len;) {
if (i >= len) break;
c = from[i++];
if (c >= 0x80)
{
to = UTF8Output (c - 0x80 + slide[active], to);
}
else if (c >= 0x20 && c <= 0x7F)
{
to = UTF8Output (c, to);
}
else if (c == 0x0 || c == 0x9 || c == 0xA || c == 0xC || c == 0xD)
{
to = UTF8Output (c, to);
}
else if (c >= 0x1 && c <= 0x8) /* SQn */
{
if (i >= len) break;
/* single quote */ d = from[i++];
to = UTF8Output (d < 0x80 ? d + start [c - 0x1] :
d - 0x80 + slide [c - 0x1], to);
}
else if (c >= 0x10 && c <= 0x17) /* SCn */
{
/* change window */ active = c - 0x10;
}
else if (c >= 0x18 && c <= 0x1F) /* SDn */
{
/* define window */ active = c - 0x18;
if (i >= len) break;
slide [active] = win [from[i++]];
}
else if (c == 0xB) /* SDX */
{
if (i >= len) break;
c = from[i++];
if (i >= len) break;
d = from[i++];
slide [active = c>>5] = 0x10000 + (((c & 0x1F) << 8 | d) << 7);
}
else if (c == 0xE) /* SQU */
{
if (i >= len) break;
/* SQU */ c = from[i++];
if (i >= len) break;
to = UTF8Output (c << 8 | from[i++], to);
}
else if (c == 0xF) /* SCU */
{
/* change to Unicode mode */ mode = 1;
while (mode)
{
if (i >= len) break;
c = from[i++];
if (c <= 0xDF || c >= 0xF3)
{
if (i >= len) break;
to = UTF8Output (c << 8 | from[i++], to);
}
else if (c == 0xF0) /* UQU */
{
if (i >= len) break;
c = from[i++];
if (i >= len) break;
to = UTF8Output (c << 8 | from[i++], to);
}
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 [from[i++]]; mode = 0;
}
else if (c == 0xF1) /* UDX */
{
if (i >= len) break;
c = from[i++];
if (i >= len) break;
d = from[i++];
slide [active = c>>5] =
0x10000 + (((c & 0x1F) << 8 | d) << 7); mode = 0;
}
}
}
}
*to++ = 0;
*to = 0;
return 0;
}
