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Add read-only support for DC42 images

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This commit is contained in:
2012-08-01 21:35:54 +00:00
parent fc52b6054b
commit efa325f75d
2 changed files with 36 additions and 3 deletions
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25
src/com/webcodepro/applecommander/storage/Disk.java
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@ -178,6 +178,7 @@ public class Disk {
this.filename = filename;
int diskSize = 0;
byte[] diskImage = null;
byte[] diskImageDC42 = null;
if (isSDK() || isSHK()) {
// If we have an SDK, unpack it and send along the byte array
@ -194,13 +195,31 @@ public class Disk {
StreamUtil.copy(input, diskImageByteArray);
diskImage = diskImageByteArray.toByteArray();
}
boolean is2img = false;
int offset = 0;
boolean is2img = false, isDC42 = false;
/* Does it have the 2IMG header? */
if ((diskImage[00] == 0x32) && (diskImage[01] == 0x49) && (diskImage[02] == 0x4D) && (diskImage[03]) == 0x47)
if ((diskImage[00] == 0x32) && (diskImage[01] == 0x49) && (diskImage[02] == 0x4D) && (diskImage[03]) == 0x47) {
is2img = true;
int offset = UniversalDiskImageLayout.OFFSET;
offset = UniversalDiskImageLayout.OFFSET;
}
/* Does it have the DiskCopy 4.2 header? */
else if (((diskImage[0x52] == 0x01) && (diskImage[0x53] == 0x00)) &&
((diskImage[0x51] == 0x02) || (diskImage[0x51] == 0x22) || (diskImage[0x51] == 0x24))) {
isDC42 = true;
offset = 84;
long end = AppleUtil.getLongValue(diskImage,0x40);
if (end < diskImage.length - 83) {
diskImageDC42 = new byte[(int)end];
System.arraycopy(diskImage, 84, diskImageDC42, 0, (int)end);
diskImageManager = new ByteArrayImageLayout(diskImageDC42);
}
else
throw new IllegalArgumentException(textBundle.get("Disk.ResizeDiskError")); // FIXME - need a better explanation of this
}
if (is2img == true || diskImage.length == APPLE_800KB_DISK + offset || diskImage.length == APPLE_5MB_HARDDISK + offset || diskImage.length == APPLE_10MB_HARDDISK + offset || diskImage.length == APPLE_20MB_HARDDISK + offset || diskImage.length == APPLE_32MB_HARDDISK + offset) {
diskImageManager = new UniversalDiskImageLayout(diskImage);
} else if (isDC42) {
diskImageManager = new ByteArrayImageLayout(diskImageDC42);
} else {
diskImageManager = new ByteArrayImageLayout(diskImage);
}

14
src/com/webcodepro/applecommander/util/AppleUtil.java
View File

@ -110,6 +110,20 @@ public class AppleUtil {
+ getUnsignedByte(buffer[offset+2])*65536;
}
/**
* Compute the value of a 4 byte value. This is specific to DC42 processing.
* Pulls value from buffer given the offset, MSB first.
*/
public static long getLongValue(byte[] buffer, int offset) {
if (offset+3 > buffer.length) {
return 0;
}
return getUnsignedByte(buffer[offset+3])
+ getUnsignedByte(buffer[offset+2])*256
+ getUnsignedByte(buffer[offset+1])*65536
+ getUnsignedByte(buffer[offset])*16777216;
}
/**
* Set the value of a 3 byte value.
*/