You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
81 lines
3.5 KiB
JavaScript
81 lines
3.5 KiB
JavaScript
// 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 (hexfile_valid) {
|
|
console.log('HEX file parsed: ' + result.bytes + ' bytes');
|
|
|
|
return result;
|
|
} else {
|
|
console.log('HEX file parsed, CRC check failed: ' + result.bytes + ' bytes');
|
|
|
|
return false;
|
|
}
|
|
} |