diff options
Diffstat (limited to 'fitz/base_unicode.c')
| -rw-r--r-- | fitz/base_unicode.c | 77 |
1 files changed, 38 insertions, 39 deletions
diff --git a/fitz/base_unicode.c b/fitz/base_unicode.c index a38dfb84..c7f8219a 100644 --- a/fitz/base_unicode.c +++ b/fitz/base_unicode.c @@ -2,39 +2,38 @@ enum { - UTFmax = 4, /* maximum bytes per rune */ - Runesync = 0x80, /* cannot represent part of a UTF sequence (<) */ - Runeself = 0x80, /* rune and UTF sequences are the same (<) */ - Runeerror = 0xFFFD, /* decoding error in UTF */ - Runemax = 0x10FFFF, /* maximum rune value */ + UTFmax = 4, /* maximum bytes per rune */ + Runesync = 0x80, /* cannot represent part of a UTF sequence (<) */ + Runeself = 0x80, /* rune and UTF sequences are the same (<) */ + Runeerror = 0xFFFD, /* decoding error in UTF */ + Runemax = 0x10FFFF, /* maximum rune value */ }; enum { - Bit1 = 7, - Bitx = 6, - Bit2 = 5, - Bit3 = 4, - Bit4 = 3, - Bit5 = 2, - - T1 = ((1<<(Bit1+1))-1) ^ 0xFF, /* 0000 0000 */ - Tx = ((1<<(Bitx+1))-1) ^ 0xFF, /* 1000 0000 */ - T2 = ((1<<(Bit2+1))-1) ^ 0xFF, /* 1100 0000 */ - T3 = ((1<<(Bit3+1))-1) ^ 0xFF, /* 1110 0000 */ - T4 = ((1<<(Bit4+1))-1) ^ 0xFF, /* 1111 0000 */ - T5 = ((1<<(Bit5+1))-1) ^ 0xFF, /* 1111 1000 */ - - Rune1 = (1<<(Bit1+0*Bitx))-1, /* 0000 0000 0111 1111 */ - Rune2 = (1<<(Bit2+1*Bitx))-1, /* 0000 0111 1111 1111 */ - Rune3 = (1<<(Bit3+2*Bitx))-1, /* 1111 1111 1111 1111 */ - Rune4 = (1<<(Bit4+3*Bitx))-1, - /* 0001 1111 1111 1111 1111 1111 */ - - Maskx = (1<<Bitx)-1, /* 0011 1111 */ - Testx = Maskx ^ 0xFF, /* 1100 0000 */ - - Bad = Runeerror, + Bit1 = 7, + Bitx = 6, + Bit2 = 5, + Bit3 = 4, + Bit4 = 3, + Bit5 = 2, + + T1 = ((1<<(Bit1+1))-1) ^ 0xFF, /* 0000 0000 */ + Tx = ((1<<(Bitx+1))-1) ^ 0xFF, /* 1000 0000 */ + T2 = ((1<<(Bit2+1))-1) ^ 0xFF, /* 1100 0000 */ + T3 = ((1<<(Bit3+1))-1) ^ 0xFF, /* 1110 0000 */ + T4 = ((1<<(Bit4+1))-1) ^ 0xFF, /* 1111 0000 */ + T5 = ((1<<(Bit5+1))-1) ^ 0xFF, /* 1111 1000 */ + + Rune1 = (1<<(Bit1+0*Bitx))-1, /* 0000 0000 0111 1111 */ + Rune2 = (1<<(Bit2+1*Bitx))-1, /* 0000 0111 1111 1111 */ + Rune3 = (1<<(Bit3+2*Bitx))-1, /* 1111 1111 1111 1111 */ + Rune4 = (1<<(Bit4+3*Bitx))-1, /* 0001 1111 1111 1111 1111 1111 */ + + Maskx = (1<<Bitx)-1, /* 0011 1111 */ + Testx = Maskx ^ 0xFF, /* 1100 0000 */ + + Bad = Runeerror, }; int @@ -45,7 +44,7 @@ chartorune(int *rune, char *str) /* * one character sequence - * 00000-0007F => T1 + * 00000-0007F => T1 */ c = *(unsigned char*)str; if(c < Tx) { @@ -55,7 +54,7 @@ chartorune(int *rune, char *str) /* * two character sequence - * 0080-07FF => T2 Tx + * 0080-07FF => T2 Tx */ c1 = *(unsigned char*)(str+1) ^ Tx; if(c1 & Testx) @@ -72,7 +71,7 @@ chartorune(int *rune, char *str) /* * three character sequence - * 0800-FFFF => T3 Tx Tx + * 0800-FFFF => T3 Tx Tx */ c2 = *(unsigned char*)(str+2) ^ Tx; if(c2 & Testx) @@ -87,7 +86,7 @@ chartorune(int *rune, char *str) /* * four character sequence (21-bit value) - * 10000-1FFFFF => T4 Tx Tx Tx + * 10000-1FFFFF => T4 Tx Tx Tx */ c3 = *(unsigned char*)(str+3) ^ Tx; if (c3 & Testx) @@ -121,7 +120,7 @@ runetochar(char *str, int *rune) /* * one character sequence - * 00000-0007F => 00-7F + * 00000-0007F => 00-7F */ c = *rune; if(c <= Rune1) { @@ -131,7 +130,7 @@ runetochar(char *str, int *rune) /* * two character sequence - * 0080-07FF => T2 Tx + * 0080-07FF => T2 Tx */ if(c <= Rune2) { str[0] = T2 | (c >> 1*Bitx); @@ -150,18 +149,18 @@ runetochar(char *str, int *rune) /* * three character sequence - * 0800-FFFF => T3 Tx Tx + * 0800-FFFF => T3 Tx Tx */ if (c <= Rune3) { - str[0] = T3 | (c >> 2*Bitx); + str[0] = T3 | (c >> 2*Bitx); str[1] = Tx | ((c >> 1*Bitx) & Maskx); - str[2] = Tx | (c & Maskx); + str[2] = Tx | (c & Maskx); return 3; } /* * four character sequence (21-bit value) - * 10000-1FFFFF => T4 Tx Tx Tx + * 10000-1FFFFF => T4 Tx Tx Tx */ str[0] = T4 | (c >> 3*Bitx); str[1] = Tx | ((c >> 2*Bitx) & Maskx); |