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Disk in current drive can now be saved as an IMG file, and groundwork has been laid for saving an entire machine

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This commit is contained in:
Jeff Parsons 2016-02-12 14:14:56 -08:00
commit 9c2ec7a20b
17 changed files with 1684 additions and 1549 deletions
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112
modules/pcjs/lib/disk.js
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@ -1198,6 +1198,9 @@ Disk.prototype.doneLoad = function(sURL, sDiskData, nErrorCode)
if (DEBUG && this.messageEnabled()) {
this.printMessage('doneLoad("' + this.sDiskPath + '")');
}
Component.addMachineResource(this.controller.idMachine, sURL, sDiskData);
try {
/*
* The following code was a hack to turn on write-protection for a disk image if there was
@ -1839,55 +1842,22 @@ Disk.prototype.getClusterEntry = function(dir, iCluster, iByte)
*
* @this {Disk}
* @param {number} pba (physical block address)
* @return {Object} sector
* @return {Object|null} sector
*/
Disk.prototype.getSector = function(pba)
{
var nSectorsPerCylinder = this.nHeads * this.nSectors;
var iCylinder = (pba / nSectorsPerCylinder) | 0;
this.assert(iCylinder < this.nCylinders);
var nSectorsRemaining = (pba % nSectorsPerCylinder);
var iHead = (nSectorsRemaining / this.nSectors) | 0;
/*
* PBA numbers are 0-based, but the sector numbers in CHS addressing are 1-based, so add one to iSector
*/
var iSector = (nSectorsRemaining % this.nSectors) + 1;
return this.seek(iCylinder, iHead, iSector);
};
/**
* updateSector(file, pba, off)
*
* Like getSector(), this must convert a PBA into CHS values; consider factoring that conversion code out.
*
* @this {Disk}
* @param {Object} file
* @param {number} pba (physical block address from the file's apba)
* @param {number} off (file offset corresponding to the given pba of the given file)
* @return {boolean} true if successfully updated, false if not
*/
Disk.prototype.updateSector = function(file, pba, off)
{
var nSectorsPerCylinder = this.nHeads * this.nSectors;
var iCylinder = (pba / nSectorsPerCylinder) | 0;
var nSectorsRemaining = (pba % nSectorsPerCylinder);
var iHead = (nSectorsRemaining / this.nSectors) | 0;
var iSector = (nSectorsRemaining % this.nSectors);
var cylinder, head, sector;
if ((cylinder = this.aDiskData[iCylinder]) && (head = cylinder[iHead]) && (sector = head[iSector])) {
this.assert(sector['sector'] == iSector +1);
if (sector['file']) {
if (DEBUG && this.messageEnabled()) {
this.printMessage('"' + sector['file'].sPath + '" cross-linked at offset ' + sector['file'].offFile + ' with "' + file.sPath + '" at offset ' + off);
}
return false;
}
sector['file'] = file;
sector.offFile = off;
return true;
if (iCylinder < this.nCylinders) {
var nSectorsRemaining = (pba % nSectorsPerCylinder);
var iHead = (nSectorsRemaining / this.nSectors) | 0;
/*
* PBA numbers are 0-based, but the sector numbers in CHS addressing are 1-based, so add one to iSector
*/
var iSector = (nSectorsRemaining % this.nSectors) + 1;
return this.seek(iCylinder, iHead, iSector);
}
if (DEBUG && this.messageEnabled()) this.printMessage("unable to map PBA " + pba + " to CHS");
return false;
return null;
};
/**
@ -1943,6 +1913,41 @@ Disk.prototype.getSectorString = function(sector, off, len)
return s;
};
/**
* updateSector(file, pba, off)
*
* Like getSector(), this must convert a PBA into CHS values; consider factoring that conversion code out.
*
* @this {Disk}
* @param {Object} file
* @param {number} pba (physical block address from the file's apba)
* @param {number} off (file offset corresponding to the given pba of the given file)
* @return {boolean} true if successfully updated, false if not
*/
Disk.prototype.updateSector = function(file, pba, off)
{
var nSectorsPerCylinder = this.nHeads * this.nSectors;
var iCylinder = (pba / nSectorsPerCylinder) | 0;
var nSectorsRemaining = (pba % nSectorsPerCylinder);
var iHead = (nSectorsRemaining / this.nSectors) | 0;
var iSector = (nSectorsRemaining % this.nSectors);
var cylinder, head, sector;
if ((cylinder = this.aDiskData[iCylinder]) && (head = cylinder[iHead]) && (sector = head[iSector])) {
this.assert(sector['sector'] == iSector +1);
if (sector['file']) {
if (DEBUG && this.messageEnabled()) {
this.printMessage('"' + sector['file'].sPath + '" cross-linked at offset ' + sector['file'].offFile + ' with "' + file.sPath + '" at offset ' + off);
}
return false;
}
sector['file'] = file;
sector.offFile = off;
return true;
}
if (DEBUG && this.messageEnabled()) this.printMessage("unable to map PBA " + pba + " to CHS");
return false;
};
/**
* initSector(sector, iCylinder, iHead, iSector, cbSector, dwPattern)
*
@ -2497,6 +2502,7 @@ Disk.prototype.write = function(sector, ibSector, b)
var dwPattern = sector['pattern'];
var idw = ibSector >> 2;
var nShift = (ibSector & 0x3) << 3;
/*
* Ensure every byte up to the specified byte is properly initialized.
*/
@ -2520,6 +2526,26 @@ Disk.prototype.write = function(sector, ibSector, b)
return null;
};
/**
* encodeAsBase64()
*
* @this {Disk}
* @return {string}
*/
Disk.prototype.encodeAsBase64 = function()
{
/*
* Gross, but simple; more importantly, it works -- at least for disks of typical floppy magnitude.
*/
var s = "", pba = 0, sector;
while ((sector = this.getSector(pba++))) {
for (var off = 0, len = sector['length']; off < len; off++) {
s += String.fromCharCode(this.getSectorData(sector, off, 1));
}
}
return btoa(s);
};
/**
* save()
*