feat:span batch v2

hildr-utilities/build.gradle

@@ -79,7 +79,6 @@ dependencies {
 	implementation 'ch.qos.logback:logback-core:1.4.7'
 	implementation 'ch.qos.logback:logback-classic:1.4.7'
 
-
 	implementation 'com.google.protobuf:protobuf-java:3.25.1'
 	implementation 'io.tmio:tuweni-units:2.4.2'
 	implementation 'io.tmio:tuweni-rlp:2.4.2'

hildr-utilities/src/main/java/io/optimism/utilities/derive/stages/RLPEncodingHelpers.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package io.optimism.utilities.derive.stages;
+
+import org.apache.tuweni.bytes.Bytes;
+import org.apache.tuweni.bytes.MutableBytes;
+
+/**
+ * Helper static methods to facilitate RLP encoding <b>within this package</b>. Neither this class
+ * nor any of its method are meant to be exposed publicly, they are too low level.
+ */
+class RLPEncodingHelpers {
+    private RLPEncodingHelpers() {}
+
+    static boolean isSingleRLPByte(final Bytes value) {
+        return value.size() == 1 && value.get(0) >= 0;
+    }
+
+    static boolean isShortElement(final Bytes value) {
+        return value.size() <= 55;
+    }
+
+    static boolean isShortList(final int payloadSize) {
+        return payloadSize <= 55;
+    }
+
+    /** The encoded size of the provided value. */
+    static int elementSize(final Bytes value) {
+        if (isSingleRLPByte(value)) return 1;
+
+        if (isShortElement(value)) return 1 + value.size();
+
+        return 1 + sizeLength(value.size()) + value.size();
+    }
+
+    /** The encoded size of a list given the encoded size of its payload. */
+    static int listSize(final int payloadSize) {
+        int size = 1 + payloadSize;
+        if (!isShortList(payloadSize)) size += sizeLength(payloadSize);
+        return size;
+    }
+
+    /**
+     * Writes the result of encoding the provided value to the provided destination (which must be big
+     * enough).
+     */
+    static int writeElement(final Bytes value, final MutableBytes dest, final int destOffset) {
+        final int size = value.size();
+        if (isSingleRLPByte(value)) {
+            dest.set(destOffset, value.get(0));
+            return destOffset + 1;
+        }
+
+        if (isShortElement(value)) {
+            dest.set(destOffset, (byte) (0x80 + size));
+            value.copyTo(dest, destOffset + 1);
+            return destOffset + 1 + size;
+        }
+
+        final int offset = writeLongMetadata(0xb7, size, dest, destOffset);
+        value.copyTo(dest, offset);
+        return offset + size;
+    }
+
+    /**
+     * Writes the encoded header of a list provided its encoded payload size to the provided
+     * destination (which must be big enough).
+     */
+    static int writeListHeader(final int payloadSize, final MutableBytes dest, final int destOffset) {
+        if (isShortList(payloadSize)) {
+            dest.set(destOffset, (byte) (0xc0 + payloadSize));
+            return destOffset + 1;
+        }
+
+        return writeLongMetadata(0xf7, payloadSize, dest, destOffset);
+    }
+
+    private static int writeLongMetadata(
+            final int baseCode, final int size, final MutableBytes dest, final int destOffset) {
+        final int sizeLength = sizeLength(size);
+        dest.set(destOffset, (byte) (baseCode + sizeLength));
+        int shift = 0;
+        for (int i = 0; i < sizeLength; i++) {
+            dest.set(destOffset + sizeLength - i, (byte) (size >> shift));
+            shift += 8;
+        }
+        return destOffset + 1 + sizeLength;
+    }
+
+    private static int sizeLength(final int size) {
+        final int zeros = Integer.numberOfLeadingZeros(size);
+        return 4 - (zeros / 8);
+    }
+}

hildr-utilities/src/main/java/io/optimism/utilities/derive/stages/SpanBatchSignature.java

@@ -1,5 +1,58 @@
 package io.optimism.utilities.derive.stages;
 
 import java.math.BigInteger;
+import java.util.Objects;
 
-public record SpanBatchSignature(BigInteger v, BigInteger r, BigInteger s) {}
+public class SpanBatchSignature {
+    private BigInteger v;
+    private BigInteger r;
+    private BigInteger s;
+
+    public SpanBatchSignature(BigInteger v, BigInteger r, BigInteger s) {
+        this.v = v;
+        this.r = r;
+        this.s = s;
+    }
+
+    public BigInteger v() {
+        return v;
+    }
+
+    public BigInteger r() {
+        return r;
+    }
+
+    public BigInteger s() {
+        return s;
+    }
+
+    public void setV(BigInteger v) {
+        this.v = v;
+    }
+
+    public void setR(BigInteger r) {
+        this.r = r;
+    }
+
+    public void setS(BigInteger s) {
+        this.s = s;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == this) return true;
+        if (obj == null || obj.getClass() != this.getClass()) return false;
+        var that = (SpanBatchSignature) obj;
+        return Objects.equals(this.v, that.v) && Objects.equals(this.r, that.r) && Objects.equals(this.s, that.s);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(v, r, s);
+    }
+
+    @Override
+    public String toString() {
+        return "SpanBatchSignature[" + "v=" + v + ", " + "r=" + r + ", " + "s=" + s + ']';
+    }
+}