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Snippet ID	Download Version	Date Posted	Author	Delete
9	1	2005-01-11 12:21	Valentin Hilbig

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// This script hereby is dedicated in the Public Domain // as long as nobody else claims the copyright for it. // origin: 2000-03-02 nospam@geht.net http://tools.geht.net/hexdump.html // Use at own risk. var last="", lasth="", inited=false; var map_valtohex, map_hextochar, map_hextoval; var hexes="0123456789ABCDEF"; // This needs JavaScript 1.2 because we need Char to Numeric value conversion // Because there are 64K UniCode characters, this map does not cover all characters. // We only cover ISO LATIN character codes. function hexinit() { var i, h; map_valtohex = new Array(); map_hextochar = new Array(); map_hextoval = new Array(); for (i=0; i<256; i++) { h = hexes.substr(i/16,1)+hexes.substr(i%16,1); map_valtohex[i] = h; map_hextochar[h] = String.fromCharCode(i); map_hextoval[h] = i; } // this is a hack because JavaScript is unable to display \0 map_hextochar["00"] = String.fromCharCode(1); inited = true; } // Usage: hexencode(variable) where variable contains data // Note: hexdecode(hexencode(v))==v function hexencode(a) { var s, l, c, i, j; if (!inited) hexinit(); l = ""; c = ""; s = ""; for (i=0; i<a.length; ) { j = a.charCodeAt(i); if (j>=32) c = c + a.charAt(i); else c = c + "."; if (j<256) l = l + map_valtohex[j] + " "; else l = l + map_valtohex[Math.floor(j/256)]+map_valtohex[j%256] + " "; if (++i==a.length || l.length>45) { s = s + l + " ".substr(l.length,50) + "! " + c + "\n"; l = ""; c = ""; } } return s; } // Usage: // hexdecode("hh hh hh hh ...") where "hh" is hex codes // hexdecode("hhhhhhhh...") for hex codes without any space within // Notes: // hexdecode(hexencode(v))==v // Limited support for unicode: hexdecode("hh hhhh hh hh hh ...") // It ignores everything behind a ! (usually ASCII dump) // It does not skip offset numbers (yet), you have to erase this yourself. function hexdecode(a) { var l,i,p,s,n,k,f,t,j,q; if (!inited) hexinit(); // split into lines l = a.split("\n"); // elliminate comments from lines for (i=0; i<l.length; i++) { p = l[i].indexOf("!"); if (p>=0) l[i] = l[i].substr(0,p); } s = ""; n = 0; for (i=0; i<l.length; i++) { p = l[i].toUpperCase(); // weed out garbage and look for spaces k = n; n = 0; f = 0; t = ""; for (j=0; j<p.length; j++) { k = p.charAt(j); if (k==" ") f = 1; else if (hexes.indexOf(k)>=0) { if (f && t!="") { n = 1; t = t + " "; f = 0; } t = t + k; } } if (i==l.length-1 && !n && k && t.length<=4) n = k; // alert("i"+i); // now process the line if (!n) // the fast case for no spaces in the line for (j=0; j<t.length; j+=2) { p = t.substr(j,2); if (p.length==2) s += map_hextochar[p]; else s += map_hextochar["0"+p]; } else // we have spaces, look at the values more closely for (j=0; j<t.length; ) { // alert("j"+j); p = t.substr(j,5); k = p.indexOf(" "); if (k<0) k = 4; else j++; if (k>p.length) k = p.length; j += k; switch (k) { case 1: s += map_hextochar["0"+p.charAt(0)]; break; case 2: s += map_hextochar[p.substr(0,2)]; break; case 3: q = map_hextoval["0"+p.charAt(0)]*256+map_hextoval[p.substr(1,2)]; if (q==0) q = 1; s += String.fromCharCode(q); break; case 4: q = map_hextoval[p.substr(0,2)]*256+map_hextoval[p.substr(2,2)]; if (q==0) q = 1; s += String.fromCharCode(q); break; } } } return s; }

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