110 lines
4.0 KiB
JavaScript
110 lines
4.0 KiB
JavaScript
'use strict';
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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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bytes_total: 0,
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start_linear_address: 0
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};
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var extended_linear_address = 0;
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var next_address = 0;
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for (var i = 0; i < data.length && hexfile_valid; i++) {
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// each byte is represnted by two chars
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var byte_count = parseInt(data[i].substr(1, 2), 16);
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var address = parseInt(data[i].substr(3, 4), 16);
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var record_type = parseInt(data[i].substr(7, 2), 16);
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var content = data[i].substr(9, byte_count * 2); // still in string format
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var checksum = parseInt(data[i].substr(9 + byte_count * 2, 2), 16); // (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 (address != next_address || next_address == 0) {
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result.data.push({'address': extended_linear_address + address, 'bytes': 0, 'data': []});
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}
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// store address for next comparison
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next_address = address + byte_count;
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// process data
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var crc = byte_count + parseInt(data[i].substr(3, 2), 16) + parseInt(data[i].substr(5, 2), 16) + record_type;
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for (var needle = 0; needle < byte_count * 2; needle += 2) { // * 2 because of 2 hex chars per 1 byte
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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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var data_block = result.data.length - 1;
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result.data[data_block].data.push(num);
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result.data[data_block].bytes++;
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crc += num;
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result.bytes_total++;
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}
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// change crc to 2's complement
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crc = (~crc + 1) & 0xFF;
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// verify
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if (crc != checksum) {
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hexfile_valid = false;
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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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if (parseInt(content, 16) != 0) { // ignore if segment is 0
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console.log('extended segment address record found - NOT IMPLEMENTED !!!');
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}
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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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if (parseInt(content, 16) != 0) { // ignore if segment is 0
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console.log('start segment address record found - NOT IMPLEMENTED !!!');
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}
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break;
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case 0x04: // extended linear address record
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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, 16)
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break;
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}
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}
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if (result.end_of_file && hexfile_valid) {
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postMessage(result);
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} else {
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postMessage(false);
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}
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}
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function microtime() {
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var now = new Date().getTime() / 1000;
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return now;
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}
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onmessage = function(event) {
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var time_parsing_start = microtime(); // track time
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read_hex_file(event.data);
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console.log('HEX_PARSER - File parsed in: ' + (microtime() - time_parsing_start).toFixed(4) + ' seconds');
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// terminate worker
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close();
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}; |