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implemented variable length field

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This commit is contained in:
Ziver Koc 2016-03-08 23:27:15 +01:00
parent 6e49a343f9
commit 227f294ae0
3 changed files with 62 additions and 40 deletions
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41
src/zutil/parser/binary/BinaryStructOutputStream.java
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@ -24,6 +24,9 @@
package zutil.parser.binary;
import zutil.ByteUtil;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.List;
@ -39,14 +42,14 @@ public class BinaryStructOutputStream {
private OutputStream out;
private byte rest;
private int restLength;
private int restBitLength; // length from Most Significant Bit
public BinaryStructOutputStream(OutputStream out){
this.out = out;
rest = 0;
restLength = 0;
restBitLength = 0;
}
@ -54,9 +57,13 @@ public class BinaryStructOutputStream {
* Generate a binary byte array from the provided struct.
* The byte array will be left
*/
/* public byte[] serialize(BinaryStruct struct) {
}*/
public static byte[] serialize(BinaryStruct struct) throws IOException {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
BinaryStructOutputStream out = new BinaryStructOutputStream(buffer);
out.write(struct);
out.flush();
return buffer.toByteArray();
}
/**
* Generate a binary stream from the provided struct and
@ -68,8 +75,19 @@ public class BinaryStructOutputStream {
for (BinaryFieldData field : structDataList){
byte[] data = field.getValue(struct);
for (int i=data.length-1; i>=0; --i) {
out.write(data[i]);
int fieldBitLength = field.getBitLength();
for (int i=data.length-1; fieldBitLength>0; fieldBitLength-=8, --i) {
byte b = data[i];
if (restBitLength == 0 && fieldBitLength >= 8)
out.write(0xFF & b);
else {
b <<= 8-restBitLength-fieldBitLength;
b &= ByteUtil.getBitMask(7-restBitLength, fieldBitLength);
rest |= b;
restBitLength += fieldBitLength;
if (restBitLength >= 8)
localFlush();
}
}
}
}
@ -79,12 +97,15 @@ public class BinaryStructOutputStream {
* Writes any outstanding data to the stream
*/
public void flush() throws IOException {
if(restLength > 0){
localFlush();
out.flush();
}
private void localFlush() throws IOException {
if(restBitLength > 0){
out.write(0xFF & rest);
rest = 0;
restLength = 0;
restBitLength = 0;
}
out.flush();
}
/**