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allow SprmBuffer to append byte[] (public method)

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git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1145277 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sergey Vladimirov 2011-07-11 18:37:28 +00:00
parent a67574d250
commit 6769f34c5f
1 changed files with 49 additions and 30 deletions
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79
src/scratchpad/src/org/apache/poi/hwpf/sprm/SprmBuffer.java
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@ -17,10 +17,10 @@
package org.apache.poi.hwpf.sprm; package org.apache.poi.hwpf.sprm;
import org.apache.poi.util.LittleEndian;
import java.util.Arrays; import java.util.Arrays;
import org.apache.poi.util.LittleEndian;
public final class SprmBuffer public final class SprmBuffer
implements Cloneable implements Cloneable
{ {
@ -44,24 +44,33 @@ public final class SprmBuffer
_offset = 0; _offset = 0;
} }
private int findSprm(short opcode) public SprmOperation findSprm( short opcode )
{
int operation = SprmOperation.getOperationFromOpcode(opcode);
int type = SprmOperation.getTypeFromOpcode(opcode);
SprmIterator si = new SprmIterator(_buf, 2);
while(si.hasNext())
{ {
SprmOperation i = si.next(); int operation = SprmOperation.getOperationFromOpcode( opcode );
if(i.getOperation() == operation && i.getType() == type) int type = SprmOperation.getTypeFromOpcode( opcode );
return i.getGrpprlOffset();
SprmIterator si = new SprmIterator( _buf, 2 );
while ( si.hasNext() )
{
SprmOperation i = si.next();
if ( i.getOperation() == operation && i.getType() == type )
return i;
}
return null;
}
private int findSprmOffset( short opcode )
{
SprmOperation sprmOperation = findSprm( opcode );
if ( sprmOperation == null )
return -1;
return sprmOperation.getGrpprlOffset();
} }
return -1;
}
public void updateSprm(short opcode, byte operand) public void updateSprm(short opcode, byte operand)
{ {
int grpprlOffset = findSprm(opcode); int grpprlOffset = findSprmOffset(opcode);
if(grpprlOffset != -1) if(grpprlOffset != -1)
{ {
_buf[grpprlOffset] = operand; _buf[grpprlOffset] = operand;
@ -72,7 +81,7 @@ public final class SprmBuffer
public void updateSprm(short opcode, short operand) public void updateSprm(short opcode, short operand)
{ {
int grpprlOffset = findSprm(opcode); int grpprlOffset = findSprmOffset(opcode);
if(grpprlOffset != -1) if(grpprlOffset != -1)
{ {
LittleEndian.putShort(_buf, grpprlOffset, operand); LittleEndian.putShort(_buf, grpprlOffset, operand);
@ -83,7 +92,7 @@ public final class SprmBuffer
public void updateSprm(short opcode, int operand) public void updateSprm(short opcode, int operand)
{ {
int grpprlOffset = findSprm(opcode); int grpprlOffset = findSprmOffset(opcode);
if(grpprlOffset != -1) if(grpprlOffset != -1)
{ {
LittleEndian.putInt(_buf, grpprlOffset, operand); LittleEndian.putInt(_buf, grpprlOffset, operand);
@ -139,11 +148,17 @@ public final class SprmBuffer
return (Arrays.equals(_buf, sprmBuf._buf)); return (Arrays.equals(_buf, sprmBuf._buf));
} }
public void append(byte[] grpprl) public void append( byte[] grpprl )
{ {
ensureCapacity(grpprl.length); append( grpprl, 0 );
System.arraycopy(grpprl, 0, _buf, _offset, grpprl.length); }
}
public void append( byte[] grpprl, int offset )
{
ensureCapacity( grpprl.length - offset );
System.arraycopy( grpprl, offset, _buf, _offset, grpprl.length - offset );
_offset += grpprl.length - offset;
}
public Object clone() public Object clone()
throws CloneNotSupportedException throws CloneNotSupportedException
@ -154,14 +169,18 @@ public final class SprmBuffer
return retVal; return retVal;
} }
private void ensureCapacity(int addition) private void ensureCapacity( int addition )
{
if (_offset + addition >= _buf.length)
{ {
// add 6 more than they need for use the next iteration if ( _offset + addition >= _buf.length )
byte[] newBuf = new byte[_offset + addition + 6]; {
System.arraycopy(_buf, 0, newBuf, 0, _buf.length); // add 6 more than they need for use the next iteration
_buf = newBuf; //
// commented - buffer shall not contain any additional bytes --
// sergey
// byte[] newBuf = new byte[_offset + addition + 6];
byte[] newBuf = new byte[_offset + addition];
System.arraycopy( _buf, 0, newBuf, 0, _buf.length );
_buf = newBuf;
}
} }
}
} }