mirror of https://github.com/hyperledger/besu
Remove RlpUtils (#285)
mbaxter
6 years ago
committed by
GitHub
parent
c555993648
commit
6125451acf
@ -1,144 +0,0 @@ |
|||||||
/* |
|
||||||
* Copyright 2018 ConsenSys AG. |
|
||||||
* |
|
||||||
* Licensed 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 tech.pegasys.pantheon.ethereum.rlp; |
|
||||||
|
|
||||||
import java.nio.ByteBuffer; |
|
||||||
|
|
||||||
public final class RlpUtils { |
|
||||||
|
|
||||||
public static final int RLP_ZERO = 0x80; |
|
||||||
|
|
||||||
private RlpUtils() { |
|
||||||
// Utility Class
|
|
||||||
} |
|
||||||
|
|
||||||
public static int encode(final byte[] buffer, final long value) { |
|
||||||
if (value == 0L) { |
|
||||||
buffer[0] = (byte) RLP_ZERO; |
|
||||||
return 1; |
|
||||||
} else { |
|
||||||
final int resultBytes = 8 - Long.numberOfLeadingZeros(value) / 8; |
|
||||||
int shift = 0; |
|
||||||
for (int i = 0; i < resultBytes; i++) { |
|
||||||
buffer[resultBytes - i - 1] = (byte) (value >> shift & 0xFF); |
|
||||||
shift += 8; |
|
||||||
} |
|
||||||
return resultBytes; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
/** |
|
||||||
* Decodes the offset of an RLP encoded element. |
|
||||||
* |
|
||||||
* @param buffer Buffer that has an RLP element starting at index {@code start} |
|
||||||
* @param start the index into the bytebuffer from which to start decoding. |
|
||||||
* @return Length of the RLP element |
|
||||||
*/ |
|
||||||
public static int decodeOffset(final ByteBuffer buffer, final int start) { |
|
||||||
int len = 0; |
|
||||||
final int offset; |
|
||||||
final int first = buffer.get(start) & 0xff; |
|
||||||
if (first <= 0x7f) { |
|
||||||
offset = 0; |
|
||||||
} else if (first <= 0xb7) { |
|
||||||
offset = 1; |
|
||||||
} else if (first <= 0xbf) { |
|
||||||
final int lenOfLen = first - 0xb7; |
|
||||||
for (int i = 0; i < lenOfLen; ++i) { |
|
||||||
len = (len << 8) + (buffer.get(start + 1 + i) & 0xff); |
|
||||||
} |
|
||||||
offset = 1 + lenOfLen; |
|
||||||
} else if (first < 0xf8) { |
|
||||||
offset = 1; |
|
||||||
} else { |
|
||||||
final int lenOfLen = first - 0xf7; |
|
||||||
for (int i = 0; i < lenOfLen; ++i) { |
|
||||||
len = (len << 8) + (buffer.get(start + 1 + i) & 0xff); |
|
||||||
} |
|
||||||
offset = 1 + lenOfLen; |
|
||||||
} |
|
||||||
return offset; |
|
||||||
} |
|
||||||
|
|
||||||
/** |
|
||||||
* Decodes the offset of an RLP encoded element. TODO: Don't wrap in buffer, use array directly |
|
||||||
* |
|
||||||
* @param buffer Buffer that has an RLP element starting at index {@code start} |
|
||||||
* @param start the index into buffer from which to start decoding. |
|
||||||
* @return Length of the RLP element |
|
||||||
*/ |
|
||||||
public static int decodeOffset(final byte[] buffer, final int start) { |
|
||||||
return decodeOffset(ByteBuffer.wrap(buffer), start); |
|
||||||
} |
|
||||||
|
|
||||||
/** |
|
||||||
* Decodes the length of an RLP encoded element starting at the beginning of the given buffer. |
|
||||||
* |
|
||||||
* @param buffer Buffer that has an RLP element starting at index {@code start} |
|
||||||
* @param start the index into buffer from which to determine the length of an RLP element. |
|
||||||
* @return Length of the RLP element |
|
||||||
*/ |
|
||||||
public static int decodeLength(final ByteBuffer buffer, final int start) { |
|
||||||
int len = 0; |
|
||||||
final int offset; |
|
||||||
final int first = buffer.get(start) & 0xff; |
|
||||||
if (first <= 0x7f) { |
|
||||||
len = 1; |
|
||||||
offset = 0; |
|
||||||
} else if (first <= 0xb7) { |
|
||||||
len = first - RLP_ZERO; |
|
||||||
offset = 1; |
|
||||||
} else if (first <= 0xbf) { |
|
||||||
final int lenOfLen = first - 0xb7; |
|
||||||
for (int i = 0; i < lenOfLen; ++i) { |
|
||||||
len = (len << 8) + (buffer.get(start + 1 + i) & 0xff); |
|
||||||
} |
|
||||||
offset = 1 + lenOfLen; |
|
||||||
} else if (first < 0xf8) { |
|
||||||
len = first - 0xc0; |
|
||||||
offset = 1; |
|
||||||
} else { |
|
||||||
final int lenOfLen = first - 0xf7; |
|
||||||
for (int i = 0; i < lenOfLen; ++i) { |
|
||||||
len = (len << 8) + (buffer.get(start + 1 + i) & 0xff); |
|
||||||
} |
|
||||||
offset = 1 + lenOfLen; |
|
||||||
} |
|
||||||
return len + offset; |
|
||||||
} |
|
||||||
|
|
||||||
/** |
|
||||||
* Decodes the length of an RLP encoded element starting at the beginning of the given buffer. |
|
||||||
* |
|
||||||
* <p>TODO: Don't wrap in buffer, use array directly |
|
||||||
* |
|
||||||
* @param buffer Buffer that has an RLP element starting at index {@code start} |
|
||||||
* @param start the index into buffer from which to start decoding an RLP element length. |
|
||||||
* @return Length of the RLP element |
|
||||||
*/ |
|
||||||
public static int decodeLength(final byte[] buffer, final int start) { |
|
||||||
return decodeLength(ByteBuffer.wrap(buffer), start); |
|
||||||
} |
|
||||||
|
|
||||||
public static long readLong(final int offset, final int length, final byte[] buffer) { |
|
||||||
long num = 0; |
|
||||||
for (int i = decodeOffset(buffer, offset); i < length; ++i) { |
|
||||||
num = (num << 8) + (buffer[offset + i] & 0xff); |
|
||||||
} |
|
||||||
return num; |
|
||||||
} |
|
||||||
|
|
||||||
public static int nextOffset(final byte[] buffer, final int offset) { |
|
||||||
return offset + decodeLength(buffer, offset); |
|
||||||
} |
|
||||||
} |
|
||||||
Loading…
Reference in new issue