mirror of
https://github.com/curioustorvald/tsvm.git
synced 2026-03-07 11:51:49 +09:00
56 lines
1.9 KiB
Plaintext
56 lines
1.9 KiB
Plaintext
// Boot script
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var _TVDOS = {};
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_TVDOS.VERSION = "1.0";
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_TVDOS.DRIVES = {}; // Object where key-value pair is <drive-letter> : [serial-port, drive-number]
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// actually figure out the drive letter association
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// Drive A is always the device we're currently on
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_TVDOS.DRIVES["A"] = _BIOS.FIRST_BOOTABLE_PORT;
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Object.freeze(_TVDOS);
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///////////////////////////////////////////////////////////////////////////////
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var filesystem = {};
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filesystem._toPorts = function(driveLetter) {
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let port = _TVDOS.DRIVES[driveLetter.toUpperCase()];
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if (port === undefined) {
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throw Error("Drive letter '" + driveLetter.toUpperCase() + "' does not exist");
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}
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return port
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};
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filesystem._close = function(portNo) {
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com.sendMessage(portNo, "CLOSE");
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};
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filesystem._flush = function(portNo) {
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com.sendMessage(portNo, "FLUSH");
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};
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// @return true if operation committed successfully, false otherwise; throws error
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// if unknown mode or invalid drive letter was given
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filesystem.open = function(driveLetter, path, operationMode) {
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let port = filesystem._toPorts(driveLetter);
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filesystem._flush(port[0]); filesystem._close(port[0]);
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let mode = operationMode.toUpperCase();
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if (mode != "R" && mode != "W" && mode != "A") {
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throw Error("Unknown file opening mode: " + mode);
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}
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com.sendMessage(port[0], "OPEN"+mode+'"'+path+'",'+port[1]);
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let response = com.getStatusCode(port[0]);
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return (response == 0);
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};
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// @return the entire contents of the file in String
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filesystem.readAll = function(driveLetter) {
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let port = filesystem._toPorts(driveLetter);
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com.sendMessage(port[0], "READ");
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let response = com.getStatusCode(port[0]);
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if (response < 0 || response >= 128) {
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let status = com.getDeviceStatus(port[0]);
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throw Error("Reading a file failed with "+status.code+": "+status.message);
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}
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return com.pullMessage(port[0]);
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};
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Object.freeze(filesystem); |