diff options
Diffstat (limited to 'squirrel_3_0_1_stable/_OLD_sqplus/SqPlusUtf8.cpp')
| -rw-r--r-- | squirrel_3_0_1_stable/_OLD_sqplus/SqPlusUtf8.cpp | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/squirrel_3_0_1_stable/_OLD_sqplus/SqPlusUtf8.cpp b/squirrel_3_0_1_stable/_OLD_sqplus/SqPlusUtf8.cpp new file mode 100644 index 000000000..f5ee39ae5 --- /dev/null +++ b/squirrel_3_0_1_stable/_OLD_sqplus/SqPlusUtf8.cpp @@ -0,0 +1,133 @@ +
+///////////////////////////////////////////////////////////////////////
+// Simple conversion routines, to, from UTF8 and full Unicode character
+// (using int).
+//
+
+// Only when needed
+#if !defined(SQPLUS_USE_LATIN1) || SQPLUS_USE_LATIN1==0
+
+static char g_utf8_length[256];
+static int g_did_init_length;
+
+void sqplus_init_utf8_lengths() {
+ // Fill in lengths in array above
+ for( int lb=0; lb<256; lb++ ){
+ int l = -1;
+ if( !(lb&0x80) ) l=1;
+ else if( (lb&0xE0)==0xC0 ) l=2;
+ else if( (lb&0xF0)==0xE0 ) l=3;
+ else if( (lb&0xF8)==0xF0 ) l=4;
+ else if( (lb&0xFC)==0xF8 ) l=5;
+ else if( (lb&0xFE)==0xFC ) l=6;
+ g_utf8_length[lb] = l;
+ }
+ g_did_init_length = 1;
+}
+
+// Length of a UTF8 encoded Unicode character
+int sqplus_utf8_len(int lead_byte){
+ if( !(lead_byte&0x80) ) return 1; // Special case, make faster
+ if( !g_did_init_length )
+ sqplus_init_utf8_lengths();
+
+ return g_utf8_length[(unsigned char)lead_byte];
+}
+
+int sqplus_utf8_len_first(const char* pc){
+ int lb = *(unsigned char*)pc;
+ if( !(lb&0x80) ) return 1; // Special case, make faster
+ if( !g_did_init_length )
+ sqplus_init_utf8_lengths();
+
+ int l = g_utf8_length[(unsigned char)lb];
+ if( l>0 ) return l;
+
+ // Invalid UTF8 lead byte. Look for next valid character.
+ const char *pc1 = pc+1;
+ while( ((*pc1)&0xC0)==0x80 )
+ pc1++;
+ return int(pc1 - pc);
+}
+
+
+// Length of a UTF8 encoded Unicode string (number of Unicode characters)
+int sqplus_utf8_strlen(const char *str) {
+ if( !str ) return 0;
+ int l, tl=0;
+ while( *str ){
+ l = sqplus_utf8_len_first(str);
+ str += l;
+ tl++;
+ }
+ return tl;
+}
+
+// Convert one UTF8 encoded character to Unicode point
+int sqplus_utf8_to_wchar(int *result, const char *string){
+ int res=-1;
+
+ // Assume argument pointers to be OK
+ unsigned char ch = *string;
+ int l = sqplus_utf8_len(ch);
+
+ if( l<1 ) return -1;
+ int wc = l>1 ? (ch&(0x7F>>l)) : ch;
+ while( l>1 ){
+ wc = (wc<<6) + (*++string & 0x3F);
+ l--;
+ }
+ *result = wc;
+
+ return 0;
+}
+
+// Convert one Unicode point to UTF8 encoded version.
+// Checks if output fits in 1/4/6 bytes buffer.
+int sqplus_wchar_to_utf8(char *s, int wc, int size){
+ if( size<1 ) return -1;
+ if( (unsigned int)wc>=0x80000000 ) return -2;
+
+ // Single byte case
+ if( wc<0x80 ){
+ *s = (char)wc;
+ //*s = (char)wc&0x7F;
+ return 1;
+ }
+ if( size<4 ) return -3;
+
+ // Two or more UTF8 bytes
+ int p = 1; // Index of last UTF8 byte
+ if( wc>0x7FF ){ // 11 bits
+ // Three or more UTF8 bytes
+ p++; // p>=2
+ if( wc>0xFFFF ){ // 16 bits
+ // Four or more UTF8 bytes
+ p++; // p>=3
+ if( wc>0x1FFFFF ){ // 21 bits
+ // Five or more UTF8 bytes
+ if( size<6 ) return -3;
+ p++; // p>=4 UTF8 bytes
+ if( wc>0x3FFFFFF ){ // 26 bits
+ // Six UTF8 bytes
+ p++; // p>=5
+ if( (unsigned int)wc>(unsigned int)0x7FFFFFF ){ // 31 bits
+ // Would need 7 UTF8 bytes. Not supported.
+ return -10;
+ }
+ s[p-4] = 0x80 | ((wc>>24)&0x3F); // Bit 24..29
+ }
+ s[p-3] = 0x80 | ((wc>>18)&0x3F); // Bit 18..23
+ }
+ s[p-2] = 0x80 | ((wc>>12)&0x3F); // Bit 12..17
+ }
+ s[p-1] = 0x80 | ((wc>>6)&0x3F); // Bit 6..11
+ }
+ s[p] = 0x80 | (wc&0x3F); // Bit 0..5
+ s[0] = (0xFC << (5-p)) | (wc>>(p*6));
+
+ return p+1;
+}
+
+#endif // #if !defined(SQPLUS_USE_LATIN1) || SQPLUS_USE_LATIN1==0
+
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