120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
package cp
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import (
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"strings"
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)
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type charsetMap struct {
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sb [256]rune // single byte runes, -1 for a double byte character lead byte
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db map[int]rune // double byte runes
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}
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func collation2charset(col Collation) *charsetMap {
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// http://msdn.microsoft.com/en-us/library/ms144250.aspx
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// http://msdn.microsoft.com/en-us/library/ms144250(v=sql.105).aspx
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switch col.SortId {
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case 30, 31, 32, 33, 34:
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return getcp437()
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case 40, 41, 42, 44, 49, 55, 56, 57, 58, 59, 60, 61:
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return getcp850()
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case 50, 51, 52, 53, 54, 71, 72, 73, 74, 75:
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return getcp1252()
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case 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96:
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return getcp1250()
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case 104, 105, 106, 107, 108:
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return getcp1251()
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case 112, 113, 114, 121, 124:
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return getcp1253()
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case 128, 129, 130:
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return getcp1254()
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case 136, 137, 138:
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return getcp1255()
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case 144, 145, 146:
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return getcp1256()
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case 152, 153, 154, 155, 156, 157, 158, 159, 160:
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return getcp1257()
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case 183, 184, 185, 186:
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return getcp1252()
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case 192, 193:
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return getcp932()
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case 194, 195:
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return getcp949()
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case 196, 197:
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return getcp950()
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case 198, 199:
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return getcp936()
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case 200:
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return getcp932()
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case 201:
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return getcp949()
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case 202:
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return getcp950()
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case 203:
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return getcp936()
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case 204, 205, 206:
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return getcp874()
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case 210, 211, 212, 213, 214, 215, 216, 217:
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return getcp1252()
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}
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// http://technet.microsoft.com/en-us/library/aa176553(v=sql.80).aspx
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switch col.getLcid() {
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case 0x001e, 0x041e:
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return getcp874()
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case 0x0411, 0x10411, 0x40411:
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return getcp932()
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case 0x0804, 0x1004, 0x20804:
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return getcp936()
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case 0x0012, 0x0412:
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return getcp949()
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case 0x0404, 0x1404, 0x0c04, 0x7c04, 0x30404, 0x21404:
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return getcp950()
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case 0x041c, 0x041a, 0x0405, 0x040e, 0x104e, 0x0415, 0x0418, 0x041b, 0x0424, 0x1040e, 0x0442, 0x081A, 0x141A:
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return getcp1250()
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case 0x0423, 0x0402, 0x042f, 0x0419, 0x0c1a, 0x0422, 0x043f, 0x0444, 0x082c, 0x046D, 0x0485, 0x201A:
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return getcp1251()
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case 0x0408:
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return getcp1253()
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case 0x041f, 0x042c, 0x0443:
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return getcp1254()
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case 0x040d:
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return getcp1255()
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case 0x0401, 0x0801, 0xc01, 0x1001, 0x1401, 0x1801, 0x1c01, 0x2001, 0x2401, 0x2801, 0x2c01, 0x3001, 0x3401, 0x3801, 0x3c01, 0x4001, 0x0429, 0x0420, 0x0480, 0x048C:
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return getcp1256()
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case 0x0425, 0x0426, 0x0427, 0x0827:
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return getcp1257()
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case 0x042a:
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return getcp1258()
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case 0x0439, 0x045a, 0x0465, 0x043A, 0x0445, 0x044D, 0x0451, 0x0453, 0x0454, 0x0461, 0x0463, 0x0481:
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return nil
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}
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return getcp1252()
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}
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func CharsetToUTF8(col Collation, s []byte) string {
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cm := collation2charset(col)
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if cm == nil {
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return string(s)
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}
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buf := strings.Builder{}
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buf.Grow(len(s))
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for i := 0; i < len(s); i++ {
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ch := cm.sb[s[i]]
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if ch == -1 {
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if i+1 == len(s) {
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ch = 0xfffd
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} else {
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n := int(s[i+1]) + (int(s[i]) << 8)
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i++
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var ok bool
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ch, ok = cm.db[n]
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if !ok {
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ch = 0xfffd
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}
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}
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}
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buf.WriteRune(ch)
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}
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return buf.String()
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}
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