Press n or j to go to the next uncovered block, b, p or k for the previous block.
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// Constructors given patterns
'use strict';
var ints = require('buffer-more-ints');
// Interpret the pattern, writing values into a buffer
function write(buf, offset, pattern, bindings) {
for (var i=0, len = pattern.length; i < len; i++) {
var segment = pattern[i];
switch (segment.type) {
case 'string':
Eif(segment.value != undefined){
offset += buf.write(segment.value, offset, 'utf8');
}else{
if (bindings[segment.name] == undefined) {
throw new Error("Missing value for pattern variable:" + segment.name + "!");
}
var val = bindings[segment.name].toString();
if (segment.left != undefined || segment.right != undefined) {
var padChar = segment.space != undefined ? ' ' : '0';
var padDirection = segment.right != undefined ? 'right' : 'left';
val = paddString(val, padChar, size_of_segment(segment, bindings), padDirection);
}
if (segment.hexbin) {
val = (Buffer.from(bindings[segment.name])).toString('hex').toUpperCase();
} else if (segment.binhex) {
val = Buffer.from(bindings[segment.name], 'hex');
} else if (segment.bcd) {
val = bindings[segment.name];
if (!/^\d*$/.test(val)) throw new Error("Non decimal value for field '" + segment.name + "'!");
val = Buffer.from(bindings[segment.name], 'hex');
} else if (segment.binary) {
var resString = '';
for(var c = 0; c < val.length; c++) {
var chr = val.charCodeAt(c);
resString += paddString(chr.toString(2), '0', 8, 'left');;
}
val = resString;
}
if (Buffer.isBuffer(val)) {
offset += val.copy(buf, offset)
} else {
offset += buf.write(val, offset, 'utf8');
}
if (segment.z) {
buf.writeUInt8(0, offset);
offset += 1;
}
}
break;
case 'binary':
offset += writeBinary(segment, buf, offset, bindings);
break;
case 'integer':
offset += writeInteger(segment, buf, offset, bindings);
break;
case 'float':
offset += writeFloat(segment, buf, offset, bindings);
break;
case 'bcd':
offset += writeBcd(segment, buf, offset, bindings);
break;
}
}
return offset;
}
function build(pattern, bindings) {
var bufsize = size_of(pattern, bindings);
var buf = Buffer.alloc(bufsize);
write(buf, 0, pattern, bindings);
return buf;
}
// In bytes
function size_of_segment(segment, bindings) {
// size refers to a variable
if (typeof segment.size === 'string') {
return (bindings[segment.size] * segment.unit) / 8;
}
if (segment.type === 'binary' && segment.size === null) {
var val = bindings[segment.name];
return val.length;
}
if (segment.type === 'string' || segment.type === 'binary') {
Iif (segment.z) {
var s = bindings[segment.name];
if (s == null) {
return 0;
}
if ((typeof s !== 'string') && !Buffer.isBuffer(s)) {
throw new Error("Field " + segment.name + " must be String or Buffer");
}
var realSize = s.length;
if (realSize > segment.size) {
throw new Error("Real segment size is greater then defined for type " + segment.type + "-z segment name " + segment.name);
}
return realSize + 1;
}
Eif (segment.type === 'string') {
return segment.value != undefined ? Buffer.byteLength(segment.value, 'utf8') : segment.size ? (segment.size * segment.unit) / 8 : Buffer.byteLength(bindings[segment.name] || '', 'utf8');
}
}
return (segment.size * segment.unit) / 8;
}
// size of the to-be-constructed binary, in bytes
function size_of(segments, bindings) {
var size = 0;
for (var i=0, len = segments.length; i < len; i++) {
size += size_of_segment(segments[i], bindings);
}
return size;
}
function writeBinary(segment, buf, offset, bindings) {
var bin = bindings[segment.name];
var size = size_of_segment(segment, bindings);
bin.copy(buf, offset, 0, size);
Iif (segment.z) {
buf.writeUInt8(0, (offset+size-1));
}
return size;
}
// TODO in ff might use the noAssert argument to Buffer.write*() but
// need to check that it does the right thing wrt little-endian
function writeInteger(segment, buf, offset, bindings) {
var value = (segment.name) ? bindings[segment.name] : segment.value;
var size = size_of_segment(segment, bindings);
return write_int(buf, value, offset, size, segment.bigendian);
}
function write_int(buf, value, offset, size, bigendian) {
switch (size) {
case 1:
buf.writeUInt8(value, offset);
break;
case 2:
(bigendian) ?
buf.writeUInt16BE(value, offset) :
buf.writeUInt16LE(value, offset);
break;
case 4:
(bigendian) ?
buf.writeUInt32BE(value, offset) :
buf.writeUInt32LE(value, offset);
break;
case 8:
(bigendian) ?
ints.writeUInt64BE(buf, value, offset) :
ints.writeUInt64LE(buf, value, offset);
break;
default:
throw new Error("integer size * unit must be 8, 16, 32 or 64");
}
return size;
}
function writeFloat(segment, buf, offset, bindings) {
var value = (segment.name) ? bindings[segment.name] : segment.value;
var size = size_of_segment(segment, bindings);
return write_float(buf, value, offset, size, segment.bigendian);
}
function write_float(buf, value, offset, size, bigendian) {
if (size === 4) {
(bigendian) ?
buf.writeFloatBE(value, offset) :
buf.writeFloatLE(value, offset);
}
else if (size === 8) {
(bigendian) ?
buf.writeDoubleBE(value, offset) :
buf.writeDoubleLE(value, offset);
}
else {
throw new Error("float size * unit must be 32 or 64");
}
return size;
}
function writeBcd(segment, buf, offset, bindings) {
var value = (segment.name) ? bindings[segment.name] : segment.value;
var size = size_of_segment(segment, bindings);
if (value.toString().length > (size * 2)) {
throw new Error("bcd integer size is greater the pattern segment size of segment name " + segment.name);
}
var resBuf = intToBcd(value, size);
resBuf.copy(buf, offset)
return size;
}
function intToBcd(val, lngth) {
var s = parseInt(val);
var len = lngth;
var bu = Buffer.alloc(len);
len--;
while (len >= 0) {
var b = (s % 10);
bu[len] = b;
s = (s - b) / 10;
var c = (s % 10);
bu[len] += (c << 4);
s = (s - c) / 10;
len--;
}
return bu;
}
function paddString(value, char, totalLength, direction) {
value = value.toString();
if (char.length == 0 || totalLength == 0 || typeof (totalLength) != "number" || value.length >= totalLength) {
return value;
}
var paddingValue = '';
for (var i = 0; i < (totalLength - value.length); i++) {
paddingValue += char.toString();
}
return direction == "left" ? String(paddingValue + value) : String(value + paddingValue);
};
var parse = require('./parse').parse;
module.exports.write = write;
module.exports.build = build;
module.exports.write_int = write_int;
module.exports.write_float = write_float;
module.exports.paddString = paddString;
module.exports.builder = function(pstr) {
pstr = (arguments.length > 1) ? [].join.call(arguments, ',') : pstr;
var pattern = parse(pstr);
return function(vars) {
return build(pattern, vars);
};
};
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