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'use strict';
require('buffer-more-ints');
var $ = require('util').format;
var parse = require('./parse').parse;
var interp = require('./interp'),
parse_int = interp.parse_int,
parse_float = interp.parse_float,
bcdToInt = interp.bcdToInt;
var construct = require('./constructor'),
write_int = construct.write_int,
write_float = construct.write_float;
var lines = [];
function $start() {
lines = [];
}
function $line(/* format , args */) {
lines.push($.apply(null, arguments));
}
function $result() {
return lines.join('\n');
}
function bits_expr(segment) {
if (typeof segment.size === 'string') {
return $('%s * %d; if (!Number.isInteger(bits)) {return false; }', var_name(segment.size), segment.unit);
}
else {
return (segment.size * segment.unit).toString();
}
}
function get_number(segment) {
$line('bits = %s;\n', bits_expr(segment));
var parser = (segment.type === 'integer') ?
'parse_int' : 'parse_float';
var be = segment.bigendian, sg = segment.signed;
$line("byteoffset = offset / 8; offset += bits");
$line("if (offset > binsize) { return false; }");
$line("else if (bits === 0) { result = null; }");
$line("else { result = %s(bin, byteoffset, bits / 8, %s, %s); }",
parser, be, sg);
}
function get_binary(segment) {
$line("byteoffset = offset / 8;");
Iif (segment.z) {
$line(" var hasRes = false;");
$line("for (var i = byteoffset; i < bin.length; i++) {");
$line(" offset += 8;");
$line(" var segm = binary[i];");
$line(" if (segm === 0) {");
$line(" hasRes=true; result = bin.slice(byteoffset, i); break; }");
$line("}");
$line(" if (!hasRes) { return false };");
} else {
Iif (segment.size === null) {
$line("offset = binsize;");
$line("result = bin.slice(byteoffset);");
}
else {
$line("bits = %s;", bits_expr(segment));
$line("offset += bits;");
$line("if (offset > binsize) { return false; }");
$line("else { result = bin.slice(byteoffset,",
"byteoffset + bits / 8); }");
}
}
}
function get_string(segment) {
$line("byteoffset = offset / 8;");
Iif (segment.z) {
$line("var strVal = ''; var strRes = '';");
$line(" for (var i = byteoffset; i < bin.length; i++) {");
$line(" offset += 8;");
$line(" var segm = bin[i];");
$line(" if (segm === 0) { strRes = strVal;");
$line(" break; }");
$line(" strVal += String.fromCharCode(segm);}");
$line(" if (strRes == '') { return false };");
$line(" result = strRes; ");
} else {
$line("bits = %s;", bits_expr(segment));
$line("offset += bits;");
$line("if (offset > binsize) { return false; }");
$line("else { result = bin.toString('utf8', byteoffset, byteoffset + bits / 8); ");
Iif (segment.hexbin) {
$line(" result = (Buffer.from(result, 'hex')); }");
} else Iif (segment.binhex) {
$line(" result = bin.toString('hex', byteoffset, byteoffset + bits / 8); }");
} else Iif (segment.bcd) {
$line(" result = bin.toString('hex', byteoffset, byteoffset + bits / 8); }");
$line(" var regex = new RegExp(/^[0123456789]+$/); ");
$line(" if (result !== '' && !regex.test(result)) { throw 'Invalid decimal string value!'; } ");
} else Iif (segment.binary) {
$line(" var regex = new RegExp(/^[01]+$/); ");
$line(" if (!regex.test(result)) { throw 'Invalid binary string value!'; } ");
$line(" var bytesCount = result.length / 8; ");
$line(" var resString = ''; ");
$line(" for (var k = 0; k < bytesCount; k++) { ");
$line(" var chrInt = parseInt(result.substr((k * 8), 8), 2); ");
$line(" resString += String.fromCharCode(chrInt); } ");
$line(" result = resString; }");
} else {
$line(" }");
}
}
}
function get_bcd(segment) {
$line("byteoffset = offset / 8;");
$line("bits = %s;", bits_expr(segment));
$line("offset += bits;");
$line("if (offset > binsize) { return false; }");
$line("else { var buf = bin.slice(byteoffset,byteoffset + bits / 8);" );
$line(" result = bcdToInt(buf); }");
}
function skip_bits(segment) {
Iif (typeof segment.size === 'string') {
// Damn. Have to look up the size.
$line("var skipbits = %s * %d;",
var_name(segment.size), segment.unit);
$line("if (offset + skipbits > binsize) { return false; }");
$line("else { offset += skipbits; }");
}
else Eif (segment.size === null) {
$line("if (offset % 8 === 0) { offset = binsize; }");
$line("else { return false; }");
}
else {
var bits = segment.unit * segment.size;
$line("if (offset + %d > binsize) { return false; }", bits);
$line("else { offset += %d; }", bits);
}
}
function match_seg(segment) {
if (segment.name === '_') {
skip_bits(segment);
}
else {
var assign_result;
switch (segment.type) {
case 'integer':
case 'float':
get_number(segment);
break;
case 'binary':
get_binary(segment);
break;
case 'string':
get_string(segment);
break;
case 'bcd':
get_bcd(segment);
break;
}
$line("if (result === false) return false;");
if (segment.name) {
// variable is given a value in the environment
$line("else if (%s !== undefined) {", var_name(segment.name));
// .. and it is not the same as that matched
$line("if (%s != result) return false;",
var_name(segment.name));
$line("}");
// variable is free
$line('else %s = result;', var_name(segment.name));
}
else {
var repr = JSON.stringify(segment.value);
$line("else if (result != %s) return false;", repr);
}
}
}
function var_name(name) {
return 'var_' + name;
}
function variables(segments) {
var names = {};
for (var i = 0; i < segments.length; i++) {
var name = segments[i].name;
if (name && name !== '_') {
names[name] = true;
}
name = segments[i].size;
if (typeof name === 'string') {
names[name] = true;
}
}
return Object.keys(names);
}
function compile_pattern(segments) {
$start();
$line("return function(binary, env) {");
$line("'use strict';");
$line("var bin = binary, env = env || {};");
$line("var offset = 0, binsize = bin.length * 8;");
$line("var bits, result, byteoffset;");
var varnames = variables(segments);
for (var v = 0; v < varnames.length; v++) {
var name = varnames[v];
$line("var %s = env['%s'];", var_name(name), name);
}
var len = segments.length;
for (var i = 0; i < len; i++) {
var segment = segments[i];
$line("// " + JSON.stringify(segment));
match_seg(segment);
}
$line("if (offset == binsize) {");
$line("return {");
for (var v = 0; v < varnames.length; v++) {
var name = varnames[v];
$line("%s: %s,", name, var_name(name));
}
$line('};');
$line('}'); // if offset == binsize
$line("else return false;");
$line("}"); // end function
var fn = new Function('parse_int', 'parse_float', 'bcdToInt', $result());
return fn(parse_int, parse_float, bcdToInt);
}
function write_seg(segment) {
switch (segment.type) {
case 'string':
Iif (segment.value === undefined) { // string variable
var padChar = segment.space != undefined ? ' ' : '0';
var padDirection = segment.right != undefined ? 'Right' : 'Left';
$line("offset += buf.write(pad%s(String(bindings['%s']),'%s',%d), offset, 'utf8');", padDirection, segment.name, padChar, segment.size);
} else { // string constant
$line("offset += buf.write(%s, offset, 'utf8');",
JSON.stringify(segment.value));
}
break;
case 'binary':
$line("val = bindings['%s'];", segment.name);
if (segment.size === null) {
$line('size = val.length;');
}
else Eif (typeof segment.size === 'string') {
$line("size = (bindings['%s'] * %d) / 8;",
segment.size, segment.unit);
}
else {
$line("size = %d;", (segment.size * segment.unit) / 8);
}
$line('val.copy(buf, offset, 0, size);');
$line('offset += size;');
break;
case 'integer':
case 'float':
write_number(segment);
break;
}
}
function write_number(segment) {
if (segment.name) {
$line("val = bindings['%s'];", segment.name);
}
else {
$line("val = %d", segment.value);
}
var writer = (segment.type === 'integer') ?
'write_int' : 'write_float';
if (typeof segment.size === 'string') {
$line("size = (bindings['%s'] * %d) / 8;",
segment.size, segment.unit);
}
else {
$line('size = %d;', (segment.size * segment.unit) / 8);
}
$line('%s(buf, val, offset, size, %s);',
writer, segment.bigendian);
$line('offset += size;');
}
function size_of(segments) {
var variable = [];
var fixed = 0;
for (var i = 0; i < segments.length; i++) {
var segment = segments[i];
if (typeof segment.size === 'string' ||
segment.size === null) {
variable.push(segment);
}
else if (segment.type === 'string') {
Iif (segment.value === undefined) { // string variable
fixed += (segment.size * segment.unit) / 8;
} else { // string constant
fixed += Buffer.byteLength(segment.value);
}
}
else {
fixed += (segment.size * segment.unit) / 8;
}
}
$line('var buffersize = %d;', fixed);
if (variable.length > 0) {
for (var j = 0; j < variable.length; j++) {
var segment = variable[j];
if (segment.size === null) {
$line("buffersize += bindings['%s'].length;", segment.name);
}
else {
$line("buffersize += (bindings['%s'] * %d) / 8;",
segment.size, segment.unit);
}
}
}
}
function emit_write(segments) {
$line('var val, size;');
var len = segments.length;
for (var i = 0; i < len; i++) {
var segment = segments[i];
$line('// %s', JSON.stringify(segment));
write_seg(segment);
}
}
function compile_ctor(segments) {
$start();
$line('return function(bindings) {');
$line("'use strict';");
$line('function padLeft(str,pad,len){return (pad.repeat(len)+str).slice(-len)}');
$line('function padRight(str,pad,len){return (str+pad.repeat(len)).substr(0,len)}');
size_of(segments);
$line('var buf = Buffer.alloc(buffersize);');
$line('var offset = 0;');
emit_write(segments);
$line('return buf;');
$line('}'); // end function
return new Function('write_int', 'write_float',
$result())(write_int, write_float);
}
module.exports.compile_pattern = compile_pattern;
module.exports.compile = function() {
var str = [].join.call(arguments, ',');
var p = parse(str);
return compile_pattern(p);
};
module.exports.compile_builder = function() {
var str = [].join.call(arguments, ',');
var p = parse(str);
return compile_ctor(p);
};
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