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Added setBit, clearBit, setString, setWordValue.

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This commit is contained in:
Robert Greene 2002-12-09 05:43:13 +00:00
parent b180c501b9
commit e16fce45c4
1 changed files with 46 additions and 3 deletions
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49
src/com/webcodepro/applecommander/storage/AppleUtil.java
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@ -29,6 +29,9 @@ import java.util.GregorianCalendar;
* @author: Rob Greene
*/
public class AppleUtil {
private static byte[] masks = {
(byte)0x01, (byte)0x02, (byte)0x04, (byte)0x08,
(byte)0x10, (byte)0x20, (byte)0x40, (byte)0x80 };
/**
* Compute the value of a word.
@ -43,7 +46,15 @@ public class AppleUtil {
*/
public static int getWordValue(byte low, byte high) {
return getUnsignedByte(low) + getUnsignedByte(high)*256;
}
}
/**
* Set a word value.
*/
public static void setWordValue(byte[] buffer, int offset, int value) {
buffer[offset] = (byte)(value % 256);
buffer[offset+1] = (byte)(value / 256);
}
/**
* Compute the value of a 3 byte value. This may be ProDOS specific.
@ -80,10 +91,22 @@ public class AppleUtil {
* Determine if a specific bit is set.
*/
public static boolean isBitSet(byte byt, int bit) {
byte[] masks = { (byte)0x01, (byte)0x02,(byte)0x04, (byte)0x08,
(byte)0x10, (byte)0x20, (byte)0x40, (byte)0x80 };
return (byt & masks[bit]) != 0;
}
/**
* Set a specific bit (turn it on).
*/
public static byte setBit(byte byt, int bit) {
return (byte) ((byt | masks[bit]) & 0xff);
}
/**
* Clear a specific bit (turn it off).
*/
public static byte clearBit(byte byt, int bit) {
return (byte) ((byt & ~masks[bit]) & 0xff);
}
/**
* Extract a string from the buffer.
@ -97,6 +120,26 @@ public class AppleUtil {
}
return new String(value);
}
/**
* Create an Apple string that is space delimited.
*/
public static void setString(byte[] buffer, int offset, String string, int length) {
for (int i=0; i<length; i++) {
char ch = ' ';
if (i < string.length()) {
ch = string.charAt(i);
}
buffer[offset+i] = (byte) (ch | 0x80);
}
}
/**
* Create an Apple string that is the same length as the given string.
*/
public static void setString(byte[] buffer, int offset, String string) {
setString(buffer, offset, string, string.length());
}
/**
* Extract a Pascal string from the buffer.