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processing hex file in different thread

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cTn 2013-11-16 10:01:29 +01:00
parent 2cc056e2a1
commit f490f99596
3 changed files with 48 additions and 18 deletions
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84
workers/hex_parser.js Normal file
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// input = string
// result = if hex file is valid, result is an object
// if hex file wasn't valid (crc check failed on any of the lines), result will be false
function read_hex_file(data) {
data = data.split("\n");
// check if there is an empty line in the end of hex file, if there is, remove it
if (data[data.length - 1] == "") {
data.pop();
}
var hexfile_valid = true; // if any of the crc checks failed, this variable flips to false
var result = {
data: [],
end_of_file: false,
extended_linear_address: 0,
start_linear_address: 0,
bytes: 0
};
for (var i = 0; i < data.length; i++) {
var byte_count = parseInt(data[i].substr(1, 2), 16) * 2; // each byte is represnted by two chars (* 2 to get the hex representation)
var address = data[i].substr(3, 4);
var record_type = parseInt(data[i].substr(7, 2), 16); // also converting from hex to decimal
var content = data[i].substr(9, byte_count);
var checksum = parseInt(data[i].substr(9 + byte_count, 2), 16); // also converting from hex to decimal (this is a 2's complement value)
switch (record_type) {
case 0x00: // data record
if (byte_count > 0) {
var crc = (byte_count / 2) + parseInt(address.substr(0, 2), 16) + parseInt(address.substr(2, 2), 16) + record_type;
for (var needle = 0; needle < byte_count; needle += 2) {
var num = parseInt(content.substr(needle, 2), 16); // get one byte in hex and convert it to decimal
result.data.push(num);
crc += num;
result.bytes++;
}
// change crc to 2's complement (same as checksum)
crc = ~crc + 1;
crc &= 0xFF;
// verify
if (crc != checksum) {
hexfile_valid = false;
// break out of the for loop as crc is wrong anyway, we dont need to process any more data
i = data.length;
}
}
break;
case 0x01: // end of file record
result.end_of_file = true;
break;
case 0x02: // extended segment address record
// not implemented
break;
case 0x03: // start segment address record
// not implemented
break;
case 0x04: // extended linear address record
result.extended_linear_address = (parseInt(content.substr(0, 2), 16) << 24) | parseInt(content.substr(2, 2), 16) << 16;
break;
case 0x05: // start linear address record
result.start_linear_address = (parseInt(content.substr(0, 2), 16) << 24) | (parseInt(content.substr(2, 2), 16) << 16) | (parseInt(content.substr(4, 2), 16) << 8) | parseInt(content.substr(6, 2), 16);
break;
}
}
if (result.end_of_file && hexfile_valid) {
postMessage(result);
} else {
postMessage(false);
}
}
onmessage = function(event) {
read_hex_file(event.data);
// terminate worker
close();
}