| /* |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| package org.apache.royale.abc; |
| |
| /** |
| * ABCReader contains the byte-level methods that read ABC bytecode. |
| */ |
| class ABCReader |
| { |
| /** |
| * Construct a new ABCReader. |
| * @param pos - the starting offset in the ABC. |
| * @param abc - the ABC bytecode. |
| */ |
| ABCReader(int pos, byte[] abc) |
| { |
| this.pos = pos; |
| this.abc = abc; |
| } |
| |
| byte[] abc; |
| |
| int pos; |
| |
| int readU8() |
| { |
| return 255 & abc[pos++]; |
| } |
| |
| int readU16() |
| { |
| return readU8() | readU8() << 8; |
| } |
| |
| int readS24() |
| { |
| return readU16() | ((byte)readU8()) << 16; |
| } |
| |
| int readU30() |
| { |
| int result = readU8(); |
| if (0 == (result & 0x00000080)) |
| return result; |
| |
| result = result & 0x0000007f | readU8() << 7; |
| if (0 == (result & 0x00004000)) |
| return result; |
| |
| result = result & 0x00003fff | readU8() << 14; |
| if (0 == (result & 0x00200000)) |
| return result; |
| |
| result = result & 0x001fffff | readU8() << 21; |
| if (0 == (result & 0x10000000)) |
| return result; |
| |
| return result & 0x0fffffff | readU8() << 28; |
| } |
| |
| double readDouble() |
| { |
| return Double.longBitsToDouble(readU16() | ((long)readU16()) << 16 | |
| ((long)readU16()) << 32 | ((long)readU16()) << 48); |
| } |
| |
| } |