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// input = string
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// result = if hex file is valid, result is an object
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// if hex file wasn't valid (crc check failed on any of the lines), result will be false
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function read_hex_file(data) {
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data = data.split("\n");
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// check if there is an empty line in the end of hex file, if there is, remove it
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if (data[data.length - 1] == "") {
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data.pop();
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}
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var hexfile_valid = true; // if any of the crc checks failed, this variable flips to false
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var result = {
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data: [],
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end_of_file: false,
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extended_linear_address: 0,
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start_linear_address: 0,
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bytes: 0
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};
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for (var i = 0; i < data.length; i++) {
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var byte_count = parseInt(data[i].substr(1, 2), 16) * 2; // each byte is represnted by two chars (* 2 to get the hex representation)
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var address = data[i].substr(3, 4);
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var record_type = parseInt(data[i].substr(7, 2), 16); // also converting from hex to decimal
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var content = data[i].substr(9, byte_count);
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var checksum = parseInt(data[i].substr(9 + byte_count, 2), 16); // also converting from hex to decimal (this is a 2's complement value)
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switch (record_type) {
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case 0x00: // data record
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if (byte_count > 0) {
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var crc = (byte_count / 2) + parseInt(address.substr(0, 2), 16) + parseInt(address.substr(2, 2), 16) + record_type;
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for (var needle = 0; needle < byte_count; needle += 2) {
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var num = parseInt(content.substr(needle, 2), 16); // get one byte in hex and convert it to decimal
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result.data.push(num);
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crc += num;
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result.bytes++;
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}
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// change crc to 2's complement (same as checksum)
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crc = ~crc + 1;
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crc &= 0xFF;
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// verify
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if (crc != checksum) {
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hexfile_valid = false;
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// break out of the for loop as crc is wrong anyway, we dont need to process any more data
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i = data.length;
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}
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}
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break;
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case 0x01: // end of file record
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result.end_of_file = true;
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break;
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case 0x02: // extended segment address record
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// not implemented
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break;
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case 0x03: // start segment address record
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// not implemented
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break;
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case 0x04: // extended linear address record
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result.extended_linear_address = (parseInt(content.substr(0, 2), 16) << 24) | parseInt(content.substr(2, 2), 16) << 16;
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break;
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case 0x05: // start linear address record
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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);
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break;
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}
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}
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if (hexfile_valid) {
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console.log('HEX file parsed: ' + result.bytes + ' bytes');
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return result;
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} else {
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console.log('HEX file parsed, CRC check failed: ' + result.bytes + ' bytes');
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return false;
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}
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}
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