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Added convertFormattedWord.

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This commit is contained in:
Robert Greene 2003-02-11 04:33:01 +00:00
parent d1f736bd1b
commit 080f0a9ab1
1 changed files with 29 additions and 3 deletions
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32
src/com/webcodepro/applecommander/storage/AppleUtil.java
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@ -31,9 +31,18 @@ import java.util.GregorianCalendar;
* @author: Rob Greene
*/
public class AppleUtil {
/**
* Bit masks used for the bit shifting or testing operations.
*/
private static byte[] masks = {
(byte)0x01, (byte)0x02, (byte)0x04, (byte)0x08,
(byte)0x10, (byte)0x20, (byte)0x40, (byte)0x80 };
/**
* Valid hex digits used when encuding or decoding hex.
*/
private static String[] hexDigits = {
"0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", "A", "B", "C", "D", "E", "F" };
/**
* Compute the value of a word.
@ -238,11 +247,9 @@ public class AppleUtil {
* Format a byte value as hexidecimal.
*/
public static String getFormattedByte(int byt) {
String[] values = { "0", "1", "2", "3", "4", "5", "6", "7",
"8", "9", "A", "B", "C", "D", "E", "F" };
int byt1 = byt & 0x0f;
int byt2 = (byt & 0xf0) >> 4;
return values[byt2] + values[byt1];
return hexDigits[byt2] + hexDigits[byt1];
}
/**
@ -253,6 +260,25 @@ public class AppleUtil {
+ getFormattedByte(word & 0x00ff);
}
/**
* Convert a typical Apple formatted word. This is essentially
* a hex string that may start with a '$' and has 1 - 4 digits.
*/
public static int convertFormattedWord(String word) {
int value = 0;
for (int i=0; word != null && i<word.length(); i++) {
char ch = word.charAt(i);
for (int nybble = 0; nybble < hexDigits.length; nybble++) {
if (ch == hexDigits[nybble].charAt(0)) {
value <<= 4;
value += nybble;
break;
}
}
}
return value;
}
/**
* Extract a ProDOS date from the buffer.
*/