private static int getFieldID(String name) {
Integer res = (Integer) fields.get(name);
return (res != null) ? res.intValue() : FIELD_UNDEFINED;
}
public void writeBytes(OutputStream os) throws IOException {
// Map between any modified UTF-8 and it's constant pool index.
Map utf8ToIndex = new HashMap();
DataOutputStream dos = new DataOutputStream(os);
TypeArray tags = getTags();
int len = (int) getLength();
int ci = 0; // constant pool index
// collect all modified UTF-8 Strings from Constant Pool
for (ci = 1; ci < len; ci++) {
byte cpConstType = tags.getByteAt(ci);
if (cpConstType == JVM_CONSTANT_Utf8) {
Symbol sym = getSymbolAt(ci);
utf8ToIndex.put(sym.asString(), new Short((short) ci));
} else if (cpConstType == JVM_CONSTANT_Long || cpConstType == JVM_CONSTANT_Double) {
ci++;
}
}
for (ci = 1; ci < len; ci++) {
int cpConstType = (int) tags.getByteAt(ci);
// write cp_info
// write constant type
switch (cpConstType) {
case JVM_CONSTANT_Utf8:
{
dos.writeByte(cpConstType);
Symbol sym = getSymbolAt(ci);
dos.writeShort((short) sym.getLength());
dos.write(sym.asByteArray());
if (DEBUG) debugMessage("CP[" + ci + "] = modified UTF-8 " + sym.asString());
break;
}
case JVM_CONSTANT_Unicode:
throw new IllegalArgumentException("Unicode constant!");
case JVM_CONSTANT_Integer:
dos.writeByte(cpConstType);
dos.writeInt(getIntAt(ci));
if (DEBUG) debugMessage("CP[" + ci + "] = int " + getIntAt(ci));
break;
case JVM_CONSTANT_Float:
dos.writeByte(cpConstType);
dos.writeFloat(getFloatAt(ci));
if (DEBUG) debugMessage("CP[" + ci + "] = float " + getFloatAt(ci));
break;
case JVM_CONSTANT_Long:
{
dos.writeByte(cpConstType);
long l = getLongAt(ci);
// long entries occupy two pool entries
ci++;
dos.writeLong(l);
break;
}
case JVM_CONSTANT_Double:
dos.writeByte(cpConstType);
dos.writeDouble(getDoubleAt(ci));
// double entries occupy two pool entries
ci++;
break;
case JVM_CONSTANT_Class:
{
dos.writeByte(cpConstType);
// Klass already resolved. ConstantPool constains klassOop.
Klass refKls = (Klass) getObjAt(ci);
String klassName = refKls.getName().asString();
Short s = (Short) utf8ToIndex.get(klassName);
dos.writeShort(s.shortValue());
if (DEBUG) debugMessage("CP[" + ci + "] = class " + s);
break;
}
// case JVM_CONSTANT_ClassIndex:
case JVM_CONSTANT_UnresolvedClass:
{
dos.writeByte(JVM_CONSTANT_Class);
String klassName = getSymbolAt(ci).asString();
Short s = (Short) utf8ToIndex.get(klassName);
dos.writeShort(s.shortValue());
if (DEBUG) debugMessage("CP[" + ci + "] = class " + s);
break;
}
case JVM_CONSTANT_String:
{
dos.writeByte(cpConstType);
String str = OopUtilities.stringOopToString(getObjAt(ci));
Short s = (Short) utf8ToIndex.get(str);
dos.writeShort(s.shortValue());
if (DEBUG) debugMessage("CP[" + ci + "] = string " + s);
break;
}
// case JVM_CONSTANT_StringIndex:
case JVM_CONSTANT_UnresolvedString:
{
dos.writeByte(JVM_CONSTANT_String);
String val = getSymbolAt(ci).asString();
Short s = (Short) utf8ToIndex.get(val);
dos.writeShort(s.shortValue());
if (DEBUG) debugMessage("CP[" + ci + "] = string " + s);
break;
}
// all external, internal method/field references
case JVM_CONSTANT_Fieldref:
case JVM_CONSTANT_Methodref:
case JVM_CONSTANT_InterfaceMethodref:
{
dos.writeByte(cpConstType);
int value = getIntAt(ci);
short klassIndex = (short) extractLowShortFromInt(value);
short nameAndTypeIndex = (short) extractHighShortFromInt(value);
dos.writeShort(klassIndex);
dos.writeShort(nameAndTypeIndex);
if (DEBUG)
debugMessage(
"CP[" + ci + "] = ref klass = " + klassIndex + ", N&T = " + nameAndTypeIndex);
break;
}
case JVM_CONSTANT_NameAndType:
{
dos.writeByte(cpConstType);
int value = getIntAt(ci);
short nameIndex = (short) extractLowShortFromInt(value);
short signatureIndex = (short) extractHighShortFromInt(value);
dos.writeShort(nameIndex);
dos.writeShort(signatureIndex);
if (DEBUG)
debugMessage(
"CP[" + ci + "] = N&T name = " + nameIndex + ", type = " + signatureIndex);
break;
}
} // switch
}
dos.flush();
return;
}
private static void addField(String name, int fieldId) {
fields.put(name, new Integer(fieldId));
}