55 lines
2.1 KiB
JavaScript
55 lines
2.1 KiB
JavaScript
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const fs = require('node:fs/promises');
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const assert = require('node:assert/strict');
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const die = (...message) => {
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console.error(...message)
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process.exit(1)
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}
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if (process.argv.length != 3) {
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die("Usage: node out2prg.js FILE.out")
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}
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const replaceExtension = (filename, ext) => {
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const idot = filename.lastIndexOf(".")
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return `${idot < 0 ? filename : filename.substr(0, idot)}.${ext}`
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}
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(async () => {
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const outfilename = process.argv[2]
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const data = await fs.readFile(outfilename)
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assert.equal(data.readUint16LE(0), 0xffff, `${outfilename} does not start with magic FFFF bytes`)
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const prgfilename = replaceExtension(outfilename, "prg")
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const prgfile = await fs.open(prgfilename, "w")
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try {
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let off = 2
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let nextAddress = null
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let bootAddr = null
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while (off < data.length) {
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const startAddr = data.readUint16LE(off)
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const endAddr = data.readUint16LE(off + 2)
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if (startAddr == endAddr && bootAddr == null) {
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bootAddr = startAddr
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console.log(`To start, type SYS${bootAddr}`)
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console.log(`Skipping byte: ${data.readUint8(off + 4)}`)
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off += 5
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continue
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}
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assert.ok(endAddr >= startAddr, `Invalid address range ${startAddr}:${endAddr}`)
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assert.ok(nextAddress == null || startAddr >= nextAddress, `Expected ${startAddr} to come after previous segment ending at ${nextAddress}`)
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const paddingLength = nextAddress == null ? 0 : startAddr - nextAddress
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const blobLength = endAddr - startAddr + 1
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if (nextAddress == null) {
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await fs.writeFile(prgfile, data.subarray(off, off + 2))
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}
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if (paddingLength > 0) {
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await fs.writeFile(prgfile, Buffer.alloc(paddingLength))
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}
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off += 4
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await fs.writeFile(prgfile, data.subarray(off, off + blobLength))
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nextAddress = endAddr + 1
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off += blobLength
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}
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} finally {
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await prgfile.close()
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}
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})()
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