diff options
Diffstat (limited to 'Source/cm_utf8.c')
| -rw-r--r-- | Source/cm_utf8.c | 67 |
1 files changed, 35 insertions, 32 deletions
diff --git a/Source/cm_utf8.c b/Source/cm_utf8.c index 6f5fa3a..2352507 100644 --- a/Source/cm_utf8.c +++ b/Source/cm_utf8.c @@ -25,24 +25,25 @@ /* Number of leading ones before a zero in the byte. */ static unsigned char const cm_utf8_ones[256] = { - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, - 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, - 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, - 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, - 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,7,8 + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 7, 8 }; /* Mask away control bits from bytes with n leading ones. */ -static unsigned char const cm_utf8_mask[7] = { - 0xEF, 0x3F, 0x1F, 0x0F, 0x07, 0x03, 0x01 -}; +static unsigned char const cm_utf8_mask[7] = { 0xEF, 0x3F, 0x1F, 0x0F, + 0x07, 0x03, 0x01 }; /* Minimum allowed value when first byte has n leading ones. */ static unsigned int const cm_utf8_min[7] = { - 0, 0, 1u<<7, 1u<<11, 1u<<16, 1u<<21, 1u<<26 /*, 1u<<31 */ + 0, 0, 1u << 7, 1u << 11, 1u << 16, 1u << 21, 1u << 26 /*, 1u<<31 */ }; const char* cm_utf8_decode_character(const char* first, const char* last, @@ -51,33 +52,35 @@ const char* cm_utf8_decode_character(const char* first, const char* last, /* Count leading ones in the first byte. */ unsigned char c = (unsigned char)*first++; unsigned char const ones = cm_utf8_ones[c]; - switch(ones) - { - case 0: *pc = c; return first; /* One-byte character. */ - case 1: case 7: case 8: return 0; /* Invalid leading byte. */ - default: break; - } + switch (ones) { + case 0: + *pc = c; + return first; /* One-byte character. */ + case 1: + case 7: + case 8: + return 0; /* Invalid leading byte. */ + default: + break; + } /* Extract bits from this multi-byte character. */ { - unsigned int uc = c & cm_utf8_mask[ones]; - int left; - for(left = ones-1; left && first != last; --left) - { - c = (unsigned char)*first++; - if(cm_utf8_ones[c] != 1) - { - return 0; + unsigned int uc = c & cm_utf8_mask[ones]; + int left; + for (left = ones - 1; left && first != last; --left) { + c = (unsigned char)*first++; + if (cm_utf8_ones[c] != 1) { + return 0; } - uc = (uc << 6) | (c & cm_utf8_mask[1]); + uc = (uc << 6) | (c & cm_utf8_mask[1]); } - if(left > 0 || uc < cm_utf8_min[ones]) - { - return 0; + if (left > 0 || uc < cm_utf8_min[ones]) { + return 0; } - *pc = uc; - return first; + *pc = uc; + return first; } } |