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PFR.html
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<!doctype HTML>
<html>
<head>
<meta charset="utf-8"/>
<title>Earthquake PFR Parser</title>
</head>
<body>
<h1 id="out">PARSING PFR!!!</h1>
<script type="text/javascript">
function PFR(method,source) {
var levels = {
INIT : 0,
HEADER_PARSED : 1,
};
var levelsErr = {
SUCCESS : 0,
HEADER_INVALID : 1,
};
var fileStruct = {};
var m2 = method.toUpperCase();
switch (m2) {
case "URL" :
fileStruct.level = 0;
fileStruct.errorLevel = 0;
fileStruct.errors = [];
var XHR = new XMLHttpRequest();
XHR.responseType = "arraybuffer";
XHR.onreadystatechange = function() {
if (XHR.readyState == 4 && XHR.status == 200) {
fileStruct.rawBytes = new DataView(XHR.response);
fileStruct.ptr = 0;
fileStruct.logFontDir = [];
fileStruct.logFontDSec = [];
fileStruct.physFontSec = [];
fileStruct.glyphStr = [];
fileStruct.header = {
sig : "",
size : 0,
sig2 : "",
headerSize : 0,
logFontDirSize : 0,
logFontDirOffset : 0,
logFontDirSize : 0,
logFontDirOffset : 0,
logFontMaxSize : 0,
logFontSectionSize : 0,
logFontSectionOffset : 0,
physFontMaxSize : 0,
physFontSectionSize : 0,
physFontSectionOffset : 0,
gpsMaxSize : 0,
gpsSectionSize : 0,
gpsSectionOffset : 0,
maxBlueValues : 0,
maxXorus : 0,
maxYorus : 0,
physFontMaxSizeHighByte : 0,
zeros : [0,0,0,0,0,0],
pfrInvertBitmap : false,
pfrBlackPixel : false,
bctMaxSize : 0,
bctSetMaxSize : 0,
pftBctSetMaxSize : 0,
nPhysFonts : 0,
maxStemSnapVsize : 0,
maxStemSnapHsize : 0,
maxChars : 0
};
fileStruct.trailer = {
size : 0,
sig : ""
};
validateHeader();
}
}
XHR.open("GET",source,true);
XHR.send();
break;
}
function validateHeader() {
fileStruct.ptr = 0;
var validSigs1 = [ // header sig
"PFR0",
"PFR1"
];
var validSigs2 = [ // trailer sig
"$PFR$"
];
var sig = getString(4);
var success = false;
for (var i=0; i < validSigs1.length; i++) {
var curr = validSigs1[i];
if (curr == sig) {
fileStruct.header.sig = sig;
success = true;
break;
}
}
if (!success) {
fileStruct.errorLevel = levelsErr.HEADER_INVALID;
fileStruct.errors.push(new Error("PFR HEADER SIGNATURE INCORRRECT!"));
}
fileStruct.ptr = fileStruct.rawBytes.buffer.byteLength - 5;
sig = getString(5);
success = false;
if (sig == validSigs2[0]) {
success = true;
fileStruct.trailer.sig = sig;
}
if (!success) {
fileStruct.errorLevel = levelsErr.HEADER_INVALID;
fileStruct.errors.push(new Error("PFR TRAILER SIGNATURE INCORRRECT"));
}
fileStruct.ptr = fileStruct.rawBytes.buffer.byteLength - 8;
var size = getU24(false);
success = false;
if (size == fileStruct.rawBytes.buffer.byteLength) {
success = true;
fileStruct.trailer.size = size;
}
if (!success) {
fileStruct.errorLevel = levelsErr.HEADER_INVALID;
fileStruct.errors.push(new Error("PFR TRAILER SIZE DOES NOT MATCH FILE SIZE!"));
}
if (fileStruct.errorLevel == 0)
fileStruct.level = levels.HEADER_PARSED;
}
function getString(len) {
var bytes = fileStruct.rawBytes;
var out = "";
if (len == 0)
len = bytes.buffer.byteLength - fileStruct.ptr;
for (var i=0; i < len; i++) {
var charCode = fileStruct.rawBytes.getUint8(fileStruct.ptr);
fileStruct.ptr++;
if (charCode > 0)
out += String.fromCharCode(charCode);
else {
break;
}
}
return out;
}
function getU24(little) {
var out = 0;
var ptr = fileStruct.ptr;
var i = fileStruct.rawBytes.getUint8(ptr);
var i2 = fileStruct.rawBytes.getUint8(ptr + 1);
var i3 = fileStruct.rawBytes.getUint8(ptr + 2);
if (little) {
out += (
(i3 << 16) +
(i2 << 8) +
i
);
} else {
out += (
(i << 16) +
(i2 << 8) +
i3
);
}
fileStruct.ptr += 3;
return out;
}
return fileStruct;
}
</script>
<script type="text/javascript">
var font = PFR("URL","bitlight_maybe.pfr");
var out = document.getElementById("out");
var list = document.createElement("ul");
out.innerHTML = "";
out.appendChild(list);
var header = document.createElement("li");
var size = document.createElement("li");
var trailer = document.createElement("li");
list.appendChild(header);
list.appendChild(size);
list.appendChild(trailer);
var loop = setInterval(function(){
if (font.level == 1) {
header.innerHTML = font.header.sig;
size.innerHTML = font.trailer.size + " bytes";
trailer.innerHTML = font.trailer.sig;
clearInterval(loop);
}
},10);
</script>
</body>
</html>