Author: abock
Date: 2005-11-27 22:02:49 -0500 (Sun, 27 Nov 2005)
New Revision: 53533
Modified:
trunk/entagged-sharp/ChangeLog
trunk/entagged-sharp/src/EncodingInfo.cs
Log:
2005-11-27 Aaron Bockover <[EMAIL PROTECTED]>
* src/EncodingInfo.cs: UnicodeValidator class to validate a string as
UTF-8; by Ruben Vermeersch
Modified: trunk/entagged-sharp/ChangeLog
===================================================================
--- trunk/entagged-sharp/ChangeLog 2005-11-28 00:45:25 UTC (rev 53532)
+++ trunk/entagged-sharp/ChangeLog 2005-11-28 03:02:49 UTC (rev 53533)
@@ -1,3 +1,8 @@
+2005-11-27 Aaron Bockover <[EMAIL PROTECTED]>
+
+ * src/EncodingInfo.cs: UnicodeValidator class to validate a string as
+ UTF-8; by Ruben Vermeersch
+
2005-11-24 Aaron Bockover <[EMAIL PROTECTED]>
* vacuum.cs: Runs make maintainer-clean and removes extra files
Modified: trunk/entagged-sharp/src/EncodingInfo.cs
===================================================================
--- trunk/entagged-sharp/src/EncodingInfo.cs 2005-11-28 00:45:25 UTC (rev
53532)
+++ trunk/entagged-sharp/src/EncodingInfo.cs 2005-11-28 03:02:49 UTC (rev
53533)
@@ -102,4 +102,81 @@
return sb.ToString().Substring(0,sb.Length-1);
}
}
+public static class UnicodeValidator
+{
+ public static bool ValidateUtf8(byte [] str)
+ {
+ int i, min = 0, val = 0;
+
+ try {
+ for(i = 0; i < str.Length; i++) {
+ if(str[i] < 128) {
+ continue;
+ }
+
+ if((str[i] & 0xe0) == 0xc0) { /* 110xxxxx */
+ if((str[i] & 0x1e) == 0) {
+ return false;
+ }
+
+ if((str[++i] & 0xc0) != 0x80) { /* 10xxxxxx */
+ return false;
+ }
+ } else {
+ bool skip_next_continuation = false;
+
+ if((str[i] & 0xf0) == 0xe0) { /* 1110xxxx */
+ min = 1 << 11;
+ val = str[i] & 0x0f;
+ skip_next_continuation = true;
+ } else if((str[i] & 0xf8) == 0xf0) { /* 11110xxx */
+ min = 1 << 16;
+ val = str[i] & 0x07;
+ } else {
+ return false;
+ }
+
+ if(!skip_next_continuation && !IsContinuationChar(str,
++i, ref val)) {
+ return false;
+ }
+
+ if(!IsContinuationChar(str, ++i, ref val)) {
+ return false;
+ }
+
+ if(!IsContinuationChar(str, ++i, ref val)) {
+ return false;
+ }
+
+ if(val < min || !IsValidUnicode(val)) {
+ return false;
+ }
+ }
+ }
+ } catch(IndexOutOfRangeException e) {
+ return false;
+ }
+
+ return true;
+ }
+
+ private static bool IsContinuationChar(byte [] str, int i, ref int val)
+ {
+ if((str[i] & 0xc0) != 0x80) { /* 10xxxxxx */
+ return false;
+ }
+
+ val <<= 6;
+ val |= str[i] & 0x3f;
+
+ return true;
+ }
+
+ private static bool IsValidUnicode(int b)
+ {
+ return (b < 0x110000 &&
+ ((b & 0xFFFFF800) != 0xD800) &&
+ (b < 0xFDD0 || b > 0xFDEF) &&
+ (b & 0xFFFE) != 0xFFFE);
+ }
}
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