/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include "unicpriv.h" #define CHK_GR94(b) ( (PRUint8) 0xa0 < (PRUint8) (b) && (PRUint8) (b) < (PRUint8) 0xff ) #define CHK_GR94_2Byte(b1,b2) (CHK_GR94(b1) && CHK_GR94(b2)) /*================================================================================= =================================================================================*/ typedef PRBool (*uSubScannerFunc) (unsigned char* in, PRUint16* out); /*================================================================================= =================================================================================*/ typedef PRBool (*uScannerFunc) ( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); MODULE_PRIVATE PRBool uScan( uScanClassID scanClass, PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); #define uSubScanner(sub,in,out) (* m_subscanner[sub])((in),(out)) PRIVATE PRBool uCheckAndScanAlways1Byte( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScanAlways2Byte( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScanAlways2ByteShiftGR( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScanAlways2ByteGR128( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); MODULE_PRIVATE PRBool uScanShift( uShiftInTable *shift, PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8F( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA2( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA3( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA4( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA5( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA6( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA7( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCnSAlways8BytesDecomposedHangul( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScanJohabHangul( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScanJohabSymbol( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uCheckAndScan4BytesGB18030( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ); PRIVATE PRBool uScanAlways2Byte( unsigned char* in, PRUint16* out ); PRIVATE PRBool uScanAlways2ByteShiftGR( unsigned char* in, PRUint16* out ); PRIVATE PRBool uScanAlways1Byte( unsigned char* in, PRUint16* out ); PRIVATE PRBool uScanAlways1BytePrefix8E( unsigned char* in, PRUint16* out ); /*================================================================================= =================================================================================*/ PRIVATE const uScannerFunc m_scanner[uNumOfCharsetType] = { uCheckAndScanAlways1Byte, uCheckAndScanAlways2Byte, uCheckAndScanAlways2ByteShiftGR, uCheckAndScan2ByteGRPrefix8F, uCheckAndScan2ByteGRPrefix8EA2, uCheckAndScan2ByteGRPrefix8EA3, uCheckAndScan2ByteGRPrefix8EA4, uCheckAndScan2ByteGRPrefix8EA5, uCheckAndScan2ByteGRPrefix8EA6, uCheckAndScan2ByteGRPrefix8EA7, uCnSAlways8BytesDecomposedHangul, uCheckAndScanJohabHangul, uCheckAndScanJohabSymbol, uCheckAndScan4BytesGB18030, uCheckAndScanAlways2ByteGR128 }; /*================================================================================= =================================================================================*/ PRIVATE const uSubScannerFunc m_subscanner[uNumOfCharType] = { uScanAlways1Byte, uScanAlways2Byte, uScanAlways2ByteShiftGR, uScanAlways1BytePrefix8E }; /*================================================================================= =================================================================================*/ MODULE_PRIVATE PRBool uScan( uScanClassID scanClass, PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { return (* m_scanner[scanClass]) (state,in,out,inbuflen,inscanlen); } /*================================================================================= =================================================================================*/ PRIVATE PRBool uScanAlways1Byte( unsigned char* in, PRUint16* out ) { *out = (PRUint16) in[0]; return PR_TRUE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uScanAlways2Byte( unsigned char* in, PRUint16* out ) { *out = (PRUint16) (( in[0] << 8) | (in[1])); return PR_TRUE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uScanAlways2ByteShiftGR( unsigned char* in, PRUint16* out ) { *out = (PRUint16) ((( in[0] << 8) | (in[1])) & 0x7F7F); return PR_TRUE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uScanAlways1BytePrefix8E( unsigned char* in, PRUint16* out ) { *out = (PRUint16) in[1]; return PR_TRUE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScanAlways1Byte( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { /* Don't check inlen. The caller should ensure it is larger than 0 */ *inscanlen = 1; *out = (PRUint16) in[0]; return PR_TRUE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScanAlways2Byte( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { if(inbuflen < 2) return PR_FALSE; else { *inscanlen = 2; *out = ((in[0] << 8) | ( in[1])) ; return PR_TRUE; } } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScanAlways2ByteShiftGR( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { /* * Both bytes should be in the range of [0xa1,0xfe] for 94x94 character sets * invoked on GR. No encoding implemented in Mozilla uses 96x96 char. sets. * Only 2nd byte range needs to be checked because * 1st byte is checked before calling this in nsUnicodeDecoerHelper.cpp */ if(inbuflen < 2) /* will lead to NS_OK_UDEC_MOREINPUT */ return PR_FALSE; else if (! CHK_GR94(in[1])) { *inscanlen = 2; *out = 0xFF; /* for 2-byte table, uMap() is guaranteed to fail for 0xFF. */ return PR_TRUE; } else { *inscanlen = 2; *out = (((in[0] << 8) | ( in[1])) & 0x7F7F); return PR_TRUE; } } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScanAlways2ByteGR128( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { /* * The first byte should be in [0xa1,0xfe] * and the second byte in [0x41,0xfe] * Used by CP949 -> Unicode converter. * Only 2nd byte range needs to be checked because * 1st byte is checked before calling this in nsUnicodeDecoderHelper.cpp */ if(inbuflen < 2) /* will lead to NS_OK_UDEC_MOREINPUT */ return PR_FALSE; else if (in[1] < 0x41) /* 2nd byte range check */ { *inscanlen = 2; *out = 0xFF; /* for 2-byte table, uMap() is guaranteed to fail for 0xFF. */ return PR_TRUE; } else { *inscanlen = 2; *out = (in[0] << 8) | in[1]; return PR_TRUE; } } /*================================================================================= =================================================================================*/ PRIVATE PRBool uScanShift( uShiftInTable *shift, PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { PRInt16 i; const uShiftInCell* cell = &(shift->shiftcell[0]); PRInt16 itemnum = shift->numOfItem; for(i=0;i= cell[i].shiftin_Min) && ( in[0] <= cell[i].shiftin_Max)) { if(inbuflen < cell[i].reserveLen) return PR_FALSE; else { *inscanlen = cell[i].reserveLen; return (uSubScanner(cell[i].classID,in,out)); } } } return PR_FALSE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScan2ByteGRPrefix8F( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { if((inbuflen < 3) ||(in[0] != 0x8F)) return PR_FALSE; else if (! CHK_GR94(in[1])) /* 2nd byte range check */ { *inscanlen = 2; *out = 0xFF; /* for 2-byte table, uMap() is guaranteed to fail for 0xFF. */ return PR_TRUE; } else if (! CHK_GR94(in[2])) /* 3rd byte range check */ { *inscanlen = 3; *out = 0xFF; /* for 2-byte table, uMap() is guaranteed to fail for 0xFF. */ return PR_TRUE; } else { *inscanlen = 3; *out = (((in[1] << 8) | ( in[2])) & 0x7F7F); return PR_TRUE; } } /*================================================================================= =================================================================================*/ /* Macro definition to use for uCheckAndScan2ByteGRPrefix8EAX() * where X is 2,3,4,5,6,7 */ #define CNS_8EAX_4BYTE(PREFIX) \ if((inbuflen < 4) || (in[0] != 0x8E)) \ return PR_FALSE; \ else if((in[1] != (PREFIX))) \ { \ *inscanlen = 2; \ *out = 0xFF; \ return PR_TRUE; \ } \ else if(! CHK_GR94(in[2])) \ { \ *inscanlen = 3; \ *out = 0xFF; \ return PR_TRUE; \ } \ else if(! CHK_GR94(in[3])) \ { \ *inscanlen = 4; \ *out = 0xFF; \ return PR_TRUE; \ } \ else \ { \ *inscanlen = 4; \ *out = (((in[2] << 8) | ( in[3])) & 0x7F7F); \ return PR_TRUE; \ } PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA2( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { CNS_8EAX_4BYTE(0xA2) } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA3( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { CNS_8EAX_4BYTE(0xA3) } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA4( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { CNS_8EAX_4BYTE(0xA4) } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA5( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { CNS_8EAX_4BYTE(0xA5) } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA6( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { CNS_8EAX_4BYTE(0xA6) } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScan2ByteGRPrefix8EA7( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { CNS_8EAX_4BYTE(0xA7) } /*================================================================================= =================================================================================*/ #define SBase 0xAC00 #define SCount 11172 #define LCount 19 #define VCount 21 #define TCount 28 #define NCount (VCount * TCount) PRIVATE PRBool uCnSAlways8BytesDecomposedHangul( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { PRUint16 LIndex, VIndex, TIndex; /* no 8 bytes, not in a4 range, or the first 2 byte are not a4d4 */ if((inbuflen < 8) || (0xa4 != in[0]) || (0xd4 != in[1]) || (0xa4 != in[2] ) || (0xa4 != in[4]) || (0xa4 != in[6])) return PR_FALSE; /* Compute LIndex */ if((in[3] < 0xa1) || (in[3] > 0xbe)) { /* illegal leading consonant */ return PR_FALSE; } else { static const PRUint8 lMap[] = { /* A1 A2 A3 A4 A5 A6 A7 */ 0, 1,0xff, 2,0xff,0xff, 3, /* A8 A9 AA AB AC AD AE AF */ 4, 5,0xff,0xff,0xff,0xff,0xff,0xff, /* B0 B1 B2 B3 B4 B5 B6 B7 */ 0xff, 6, 7, 8,0xff, 9, 10, 11, /* B8 B9 BA BB BC BD BE */ 12, 13, 14, 15, 16, 17, 18 }; LIndex = lMap[in[3] - 0xa1]; if(0xff == (0xff & LIndex)) return PR_FALSE; } /* Compute VIndex */ if((in[5] < 0xbf) || (in[5] > 0xd3)) { /* illegal medial vowel */ return PR_FALSE; } else { VIndex = in[5] - 0xbf; } /* Compute TIndex */ if(0xd4 == in[7]) { TIndex = 0; } else if((in[7] < 0xa1) || (in[7] > 0xbe)) {/* illegal trailing consonant */ return PR_FALSE; } else { static const PRUint8 tMap[] = { /* A1 A2 A3 A4 A5 A6 A7 */ 1, 2, 3, 4, 5, 6, 7, /* A8 A9 AA AB AC AD AE AF */ 0xff, 8, 9, 10, 11, 12, 13, 14, /* B0 B1 B2 B3 B4 B5 B6 B7 */ 15, 16, 17,0xff, 18, 19, 20, 21, /* B8 B9 BA BB BC BD BE */ 22,0xff, 23, 24, 25, 26, 27 }; TIndex = tMap[in[7] - 0xa1]; if(0xff == (0xff & TIndex)) return PR_FALSE; } *inscanlen = 8; /* the following line is from Unicode 2.0 page 3-13 item 5 */ *out = ( LIndex * VCount + VIndex) * TCount + TIndex + SBase; return PR_TRUE; } /*================================================================================= =================================================================================*/ PRIVATE PRBool uCheckAndScanJohabHangul( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { /* since we don't have code to convert Johab to Unicode right now * * make this part of code #if 0 to save space until we fully test it */ if(inbuflen < 2) return PR_FALSE; else { /* * See Table 4-45 Johab Encoding's Five-Bit Binary Patterns in page 183 * of "CJKV Information Processing" for details */ static const PRUint8 lMap[32]={ /* totaly 19 */ 0xff,0xff,0, 1, 2, 3, 4, 5, /* 0-7 */ 6, 7, 8, 9, 10, 11, 12, 13, /* 8-15 */ 14, 15, 16, 17, 18, 0xff,0xff,0xff, /* 16-23 */ 0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff /* 24-31 */ }; static const PRUint8 vMap[32]={ /* totaly 21 */ 0xff,0xff,0xff,0, 1, 2, 3, 4, /* 0-7 */ 0xff,0xff,5, 6, 7, 8, 9, 10, /* 8-15 */ 0xff,0xff,11, 12, 13, 14, 15, 16, /* 16-23 */ 0xff,0xff,17, 18, 19, 20, 0xff,0xff /* 24-31 */ }; static const PRUint8 tMap[32]={ /* totaly 29 */ 0xff,0, 1, 2, 3, 4, 5, 6, /* 0-7 */ 7, 8, 9, 10, 11, 12, 13, 14, /* 8-15 */ 15, 16, 0xff,17, 18, 19, 20, 21, /* 16-23 */ 22, 23, 24, 25, 26, 27, 0xff,0xff /* 24-31 */ }; PRUint16 ch = (in[0] << 8) | in[1]; PRUint16 LIndex, VIndex, TIndex; if(0 == (0x8000 & ch)) return PR_FALSE; LIndex=lMap[(ch>>10)& 0x1F]; VIndex=vMap[(ch>>5) & 0x1F]; TIndex=tMap[(ch>>0) & 0x1F]; if((0xff==(LIndex)) || (0xff==(VIndex)) || (0xff==(TIndex))) return PR_FALSE; /* the following line is from Unicode 2.0 page 3-13 item 5 */ *out = ( LIndex * VCount + VIndex) * TCount + TIndex + SBase; *inscanlen = 2; return PR_TRUE; } } PRIVATE PRBool uCheckAndScanJohabSymbol( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { if(inbuflen < 2) return PR_FALSE; else { /* * The following code are based on the Perl code lised under * "Johab to ISO-2022-KR or EUC-KR Conversion" in page 1014 of * "CJKV Information Processing" by Ken Lunde * * sub johab2ks ($) { # Convert Johab to ISO-2022-KR * my @johab = unpack("C*", $_[0]); * my ($offset, $d8_off) = (0,0); * my @out = (); * while(($hi, $lo) = splice($johab, 0, 2)) { * $offset = 1 if ($hi > 223 and $hi < 250); * $d8_off = ($hi == 216 and ($lo > 160 ? 94 : 42)); * push (@out, (((($hi - ($hi < 223 ? 200 : 187)) << 1) - * ($lo < 161 ? 1 : 0) + $offset) + $d8_off), * $lo - ($lo < 161 ? ($lo > 126 ? 34 : 16) : 128 )); * } * return pack ("C*", @out); * } * additional comments from Ken Lunde * $d8_off = ($hi == 216 and ($lo > 160 ? 94 : 42)); * has three possible return values: * 0 if $hi is not equal to 216 * 94 if $hi is euqal to 216 and if $lo is greater than 160 * 42 if $hi is euqal to 216 and if $lo is not greater than 160 */ unsigned char hi = in[0]; unsigned char lo = in[1]; PRUint16 offset = (( hi > 223 ) && ( hi < 250)) ? 1 : 0; PRUint16 d8_off = 0; if(216 == hi) { if( lo > 160) d8_off = 94; else d8_off = 42; } *out = (((((hi - ((hi < 223) ? 200 : 187)) << 1) - (lo < 161 ? 1 : 0) + offset) + d8_off) << 8 ) | (lo - ((lo < 161) ? ((lo > 126) ? 34 : 16) : 128)); *inscanlen = 2; return PR_TRUE; } } PRIVATE PRBool uCheckAndScan4BytesGB18030( PRInt32* state, unsigned char *in, PRUint16 *out, PRUint32 inbuflen, PRUint32* inscanlen ) { PRUint32 data; if(inbuflen < 4) return PR_FALSE; if((in[0] < 0x81 ) || (0xfe < in[0])) return PR_FALSE; if((in[1] < 0x30 ) || (0x39 < in[1])) return PR_FALSE; if((in[2] < 0x81 ) || (0xfe < in[2])) return PR_FALSE; if((in[3] < 0x30 ) || (0x39 < in[3])) return PR_FALSE; data = (((((in[0] - 0x81) * 10 + (in[1] - 0x30)) * 126) + (in[2] - 0x81)) * 10 ) + (in[3] - 0x30); *inscanlen = 4; *out = (data < 0x00010000) ? data : 0xFFFD; return PR_TRUE; }