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-rw-r--r--content/util.js61
1 files changed, 61 insertions, 0 deletions
diff --git a/content/util.js b/content/util.js
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--- a/dev/null
+++ b/content/util.js
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+/*
+ * convert unicode string to utf-8 representation.
+ * needed for correct md5 hash calculation.
+ */
+function toutf8(ucode) {
+ var rv = '';
+ for(var i=0;i<ucode.length;++i) {
+ var cc = ucode.charCodeAt(i);
+ if(cc<=0x7F)
+ rv += ucode.charAt(i);
+ else if(cc<=0x7ff)
+ rv += String.fromCharCode(
+ 0xc0|((cc>> 6)&0x1f),
+ 0x80|( cc &0x3f) );
+ else if(cc<=0xffff)
+ rv += String.fromCharCode(
+ 0xe0|((cc>>12)&0x0f),
+ 0x80|((cc>> 6)&0x3f),
+ 0x80|( cc &0x3f) );
+ else if(cc<=0x1fffff)
+ rv += String.fromCharCode(
+ 0xf0|((cc>>18)&0x07),
+ 0x80|((cc>>12)&0x3f),
+ 0x80|((cc>> 6)&0x3f),
+ 0x80|( cc &0x3f) );
+ else if(cc<=0x03ffffff)
+ rv += String.fromCharCode(
+ 0xf8|((cc>>24)&0x03),
+ 0x80|((cc>>18)&0x3f),
+ 0x80|((cc>>12)&0x3f),
+ 0x80|((cc>> 6)&0x3f),
+ 0x80|( cc &0x3f) );
+ else if(cc<=0x7fffffff)
+ rv += String.fromCharCode(
+ 0xfc|((cc>>30)&0x01),
+ 0x80|((cc>>24)&0x3f),
+ 0x80|((cc>>18)&0x3f),
+ 0x80|((cc>>12)&0x3f),
+ 0x80|((cc>> 6)&0x3f),
+ 0x80|( cc &0x3f) );
+ }
+ return rv;
+}
+
+/*
+ * extract xpath-specified string value
+ */
+function xp_str(xp,x) {
+ var rv = x.evaluate(
+ xp, x, null, XPathResult.STRING_TYPE, null );
+ return rv.stringValue;
+}
+/*
+ * extract xpath-specified node
+ */
+function xp_node(xp,x) {
+ var rv = x.evaluate(
+ xp, x, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null );
+ return rv.singleNodeValue;
+}
+