Add back compute_cells function

bindings/csharp/Ckzg.Bindings/Ckzg.Bindings.csproj

@@ -33,13 +33,13 @@
     </ItemGroup>
 
     <ItemGroup>
-        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/win-x64/native/ckzg.dll" Pack="true" PackagePath="runtimes/win-x64/native/ckzg.dll" />
+        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/win-x64/native/ckzg.dll" Condition="Exists('runtimes/win-x64/native/ckzg.dll')" Pack="true" PackagePath="runtimes/win-x64/native/ckzg.dll" />
 
-        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/linux-x64/native/ckzg.so" Pack="true" PackagePath="runtimes/linux-x64/native/ckzg.so" />
-        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/linux-arm64/native/ckzg.so" Pack="true" PackagePath="runtimes/linux-arm64/native/ckzg.so" />
+        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/linux-x64/native/ckzg.so" Condition="Exists('runtimes/linux-x64/native/ckzg.so')" Pack="true" PackagePath="runtimes/linux-x64/native/ckzg.so" />
+        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/linux-arm64/native/ckzg.so" Condition="Exists('runtimes/linux-arm64/native/ckzg.so')" Pack="true" PackagePath="runtimes/linux-arm64/native/ckzg.so" />
 
-        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/osx-x64/native/ckzg.dylib" Pack="true" PackagePath="runtimes/osx-x64/native/ckzg.dylib" />
-        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/osx-arm64/native/ckzg.dylib" Pack="true" PackagePath="runtimes/osx-arm64/native/ckzg.dylib" />
+        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/osx-x64/native/ckzg.dylib" Condition="Exists('runtimes/osx-x64/native/ckzg.dylib')" Pack="true" PackagePath="runtimes/osx-x64/native/ckzg.dylib" />
+        <Content CopyToOutputDirectory="PreserveNewest" Include="runtimes/osx-arm64/native/ckzg.dylib" Condition="Exists('runtimes/osx-arm64/native/ckzg.dylib')" Pack="true" PackagePath="runtimes/osx-arm64/native/ckzg.dylib" />
     </ItemGroup>
 
     <ItemGroup>

bindings/csharp/Ckzg.Bindings/Ckzg.cs

@@ -200,6 +200,28 @@ public static unsafe bool VerifyBlobKzgProofBatch(ReadOnlySpan<byte> blobs, Read
         }
     }
 
+    /// <summary>
+    ///     Given a blob, get all of its cells.
+    /// </summary>
+    /// <param name="cells">Cells as a flattened byte array</param>
+    /// <param name="blob">Blob bytes</param>
+    /// <param name="ckzgSetup">Trusted setup settings</param>
+    /// <exception cref="ArgumentException">Thrown when length of an argument is not correct or settings are not correct</exception>
+    /// <exception cref="ApplicationException">Thrown when the library returns unexpected Error code</exception>
+    /// <exception cref="InsufficientMemoryException">Thrown when the library has no enough memory to process</exception>
+    public static unsafe void ComputeCells(Span<byte> cells, ReadOnlySpan<byte> blob, IntPtr ckzgSetup)
+    {
+        ThrowOnUninitializedTrustedSetup(ckzgSetup);
+        ThrowOnInvalidLength(cells, nameof(cells), BytesPerCell * CellsPerExtBlob);
+        ThrowOnInvalidLength(blob, nameof(blob), BytesPerBlob);
+
+        fixed (byte* cellsPtr = cells, blobPtr = blob)
+        {
+            KzgResult result = ComputeCellsAndKzgProofs(cellsPtr, null, blobPtr, ckzgSetup);
+            ThrowOnError(result);
+        }
+    }
+
     /// <summary>
     ///     Given a blob, get all of its cells and proofs.
     /// </summary>

bindings/csharp/Ckzg.Test/ReferenceTests.cs

@@ -38,6 +38,7 @@ public void TestSetupLoaded()
     private static readonly string _verifyKzgProofTests = Path.Join(TestDir, "verify_kzg_proof");
     private static readonly string _verifyBlobKzgProofTests = Path.Join(TestDir, "verify_blob_kzg_proof");
     private static readonly string _verifyBlobKzgProofBatchTests = Path.Join(TestDir, "verify_blob_kzg_proof_batch");
+    private static readonly string _computeCellsTests = Path.Join(TestDir, "compute_cells");
     private static readonly string _computeCellsAndKzgProofsTests = Path.Join(TestDir, "compute_cells_and_kzg_proofs");
     private static readonly string _recoverCellsAndKzgProofsTests = Path.Join(TestDir, "recover_cells_and_kzg_proofs");
     private static readonly string _verifyCellKzgProofBatchTests = Path.Join(TestDir, "verify_cell_kzg_proof_batch");
@@ -366,6 +367,55 @@ public void TestVerifyBlobKzgProofBatch(VerifyBlobKzgProofBatchTest test)
 
     #endregion
 
+    #region ComputeCells
+
+    public class ComputeCellsInput
+    {
+        public string Blob { get; set; } = null!;
+    }
+
+    public class ComputeCellsTest
+    {
+        public ComputeCellsInput Input { get; set; } = null!;
+        public List<string>? Output { get; set; } = null!;
+    }
+
+    private static IEnumerable<ComputeCellsTest> GetComputeCellsTests()
+    {
+        Matcher matcher = new();
+        matcher.AddIncludePatterns(new[] { "*/*/data.yaml" });
+        IEnumerable<string> testFiles = matcher.GetResultsInFullPath(_computeCellsTests);
+        foreach (string testFile in testFiles)
+        {
+            string yaml = File.ReadAllText(testFile);
+            ComputeCellsTest test = _deserializer.Deserialize<ComputeCellsTest>(yaml);
+            Assert.That(test, Is.Not.EqualTo(null));
+            yield return test;
+        }
+    }
+
+
+    [Test, TestCaseSource(nameof(GetComputeCellsTests))]
+    public void TestComputeCells(ComputeCellsTest test)
+    {
+        byte[] cells = new byte[CellsPerExtBlob * Ckzg.BytesPerCell];
+        byte[] blob = GetBytes(test.Input.Blob);
+
+        try
+        {
+            Ckzg.ComputeCells(cells, blob, _ts);
+            Assert.That(test.Output, Is.Not.EqualTo(null));
+            byte[] expectedCells = GetFlatBytes(test.Output);
+            Assert.That(cells, Is.EqualTo(expectedCells));
+        }
+        catch
+        {
+            Assert.That(test.Output, Is.EqualTo(null));
+        }
+    }
+
+    #endregion
+
     #region ComputeCellsAndKzgProofs
 
     public class ComputeCellsAndKzgProofsInput

bindings/go/main.go

@@ -399,6 +399,33 @@ func VerifyBlobKZGProofBatch(blobs []Blob, commitmentsBytes, proofsBytes []Bytes
 	return bool(result), nil
 }
 
+/*
+ComputeCellsAndKZGProofs is the binding for:
+
+	C_KZG_RET compute_cells_and_kzg_proofs(
+	    Cell *cells,
+	    KZGProof *proofs,
+	    const Blob *blob,
+	    const KZGSettings *s);
+*/
+func ComputeCells(blob *Blob) ([CellsPerExtBlob]Cell, error) {
+	if !loaded {
+		panic("trusted setup isn't loaded")
+	}
+
+	cells := [CellsPerExtBlob]Cell{}
+	ret := C.compute_cells_and_kzg_proofs(
+		(*C.Cell)(unsafe.Pointer(&cells)),
+		(*C.KZGProof)(nil),
+		(*C.Blob)(unsafe.Pointer(blob)),
+		&settings)
+
+	if ret != C.C_KZG_OK {
+		return [CellsPerExtBlob]Cell{}, makeErrorFromRet(ret)
+	}
+	return cells, nil
+}
+
 /*
 ComputeCellsAndKZGProofs is the binding for:
 

bindings/go/main_test.go

@@ -96,6 +96,7 @@ var (
 	verifyKZGProofTests           = filepath.Join(testDir, "verify_kzg_proof/*/*/*")
 	verifyBlobKZGProofTests       = filepath.Join(testDir, "verify_blob_kzg_proof/*/*/*")
 	verifyBlobKZGProofBatchTests  = filepath.Join(testDir, "verify_blob_kzg_proof_batch/*/*/*")
+	computeCellsTests             = filepath.Join(testDir, "compute_cells/*/*/*")
 	computeCellsAndKZGProofsTests = filepath.Join(testDir, "compute_cells_and_kzg_proofs/*/*/*")
 	recoverCellsAndKZGProofsTests = filepath.Join(testDir, "recover_cells_and_kzg_proofs/*/*/*")
 	verifyCellKZGProofBatchTests  = filepath.Join(testDir, "verify_cell_kzg_proof_batch/*/*/*")
@@ -426,6 +427,53 @@ func TestVerifyBlobKZGProofBatch(t *testing.T) {
 	}
 }
 
+func TestComputeCells(t *testing.T) {
+	type Test struct {
+		Input struct {
+			Blob string `yaml:"blob"`
+		}
+		Output *[]string `yaml:"output"`
+	}
+
+	tests, err := filepath.Glob(computeCellsTests)
+	require.NoError(t, err)
+	require.True(t, len(tests) > 0)
+
+	for _, testPath := range tests {
+		t.Run(testPath, func(t *testing.T) {
+			testFile, err := os.Open(testPath)
+			require.NoError(t, err)
+			test := Test{}
+			err = yaml.NewDecoder(testFile).Decode(&test)
+			require.NoError(t, testFile.Close())
+			require.NoError(t, err)
+
+			var blob Blob
+			err = blob.UnmarshalText([]byte(test.Input.Blob))
+			if err != nil {
+				require.Nil(t, test.Output)
+				return
+			}
+
+			cells, err := ComputeCells(&blob)
+			if err == nil {
+				require.NotNil(t, test.Output)
+				var expectedCells []Cell
+				for _, cellStr := range *test.Output {
+					var cell Cell
+					err := cell.UnmarshalText([]byte(cellStr))
+					require.NoError(t, err)
+					expectedCells = append(expectedCells, cell)
+				}
+				require.Equal(t, expectedCells, cells[:])
+
+			} else {
+				require.Nil(t, test.Output)
+			}
+		})
+	}
+}
+
 func TestComputeCellsAndKZGProofs(t *testing.T) {
 	type Test struct {
 		Input struct {
@@ -725,6 +773,13 @@ func Benchmark(b *testing.B) {
 		})
 	}
 
+	b.Run("ComputeCells", func(b *testing.B) {
+		for n := 0; n < b.N; n++ {
+			_, err := ComputeCells(&blobs[0])
+			require.NoError(b, err)
+		}
+	})
+
 	FreeTrustedSetup()
 	for i := 0; i <= 8; i++ {
 		if err := LoadTrustedSetupFile("../../src/trusted_setup.txt", uint(i)); err != nil {

bindings/java/ckzg_jni.c

@@ -482,6 +482,42 @@ Java_ethereum_ckzg4844_CKZG4844JNI_verifyBlobKzgProofBatch(
   return (jboolean)out;
 }
 
+JNIEXPORT jobject JNICALL Java_ethereum_ckzg4844_CKZG4844JNI_computeCells(
+    JNIEnv *env, jclass thisCls, jbyteArray blob) {
+  if (settings == NULL) {
+    throw_exception(env, TRUSTED_SETUP_NOT_LOADED);
+    return NULL;
+  }
+
+  size_t blob_size = (size_t)(*env)->GetArrayLength(env, blob);
+  if (blob_size != BYTES_PER_BLOB) {
+    throw_invalid_size_exception(env, "Invalid blob size.", blob_size,
+                                 BYTES_PER_BLOB);
+    return NULL;
+  }
+
+  /* The output cells */
+  jbyteArray cells =
+      (*env)->NewByteArray(env, CELLS_PER_EXT_BLOB * BYTES_PER_CELL);
+
+  /* The native variables */
+  Cell *cells_native = (Cell *)(*env)->GetByteArrayElements(env, cells, NULL);
+  Blob *blob_native = (Blob *)(*env)->GetByteArrayElements(env, blob, NULL);
+
+  C_KZG_RET ret =
+      compute_cells_and_kzg_proofs(cells_native, NULL, blob_native, settings);
+
+  (*env)->ReleaseByteArrayElements(env, cells, (jbyte *)cells_native, 0);
+  (*env)->ReleaseByteArrayElements(env, blob, (jbyte *)blob_native, JNI_ABORT);
+
+  if (ret != C_KZG_OK) {
+    throw_c_kzg_exception(env, ret, "There was an error in computeCells.");
+    return NULL;
+  }
+
+  return cells;
+}
+
 JNIEXPORT jobject JNICALL
 Java_ethereum_ckzg4844_CKZG4844JNI_computeCellsAndKzgProofs(JNIEnv *env,
                                                             jclass thisCls,
@@ -637,8 +673,7 @@ Java_ethereum_ckzg4844_CKZG4844JNI_verifyCellKzgProofBatch(
       (size_t)(*env)->GetArrayLength(env, commitments_bytes);
   if (commitments_size % BYTES_PER_COMMITMENT != 0) {
     throw_invalid_size_exception(env, "Invalid commitments size.",
-                                 commitments_size,
-                                 BYTES_PER_COMMITMENT);
+                                 commitments_size, BYTES_PER_COMMITMENT);
     return 0;
   }
   size_t num_commitments = commitments_size / BYTES_PER_COMMITMENT;

bindings/java/src/main/java/ethereum/ckzg4844/CKZG4844JNI.java

@@ -214,6 +214,15 @@ public static native boolean verifyBlobKzgProof(
   public static native boolean verifyBlobKzgProofBatch(
       byte[] blobs, byte[] commitmentsBytes, byte[] proofsBytes, long count);
 
+  /**
+   * Get the cells for a given blob.
+   *
+   * @param blob the blob to get cells for
+   * @return the cells
+   * @throws CKZGException if there is a crypto error
+   */
+  public static native byte[] computeCells(byte[] blob);
+
   /**
    * Get the cells and proofs for a given blob.
    *

bindings/java/src/test/java/ethereum/ckzg4844/CKZG4844JNITest.java

@@ -120,6 +120,17 @@ public void verifyBlobKzgProofBatchTests(final VerifyBlobKzgProofBatchTest test)
     }
   }
 
+  @ParameterizedTest
+  @MethodSource("getComputeCellsTests")
+  public void verifyComputeCellsTests(final ComputeCellsTest test) {
+    try {
+      byte[] cells = CKZG4844JNI.computeCells(test.getInput().getBlob());
+      assertArrayEquals(test.getOutput(), cells);
+    } catch (CKZGException ex) {
+      assertNull(test.getOutput());
+    }
+  }
+
   @ParameterizedTest
   @MethodSource("getComputeCellsAndKzgProofsTests")
   public void verifyComputeCellsAndKzgProofsTests(final ComputeCellsAndKzgProofsTest test) {
@@ -522,6 +533,11 @@ private static Stream<VerifyBlobKzgProofBatchTest> getVerifyBlobKzgProofBatchTes
         .onClose(CKZG4844JNI::freeTrustedSetup);
   }
 
+  private static Stream<ComputeCellsTest> getComputeCellsTests() {
+    loadTrustedSetup();
+    return TestUtils.getComputeCellsTests().stream().onClose(CKZG4844JNI::freeTrustedSetup);
+  }
+
   private static Stream<ComputeCellsAndKzgProofsTest> getComputeCellsAndKzgProofsTests() {
     loadTrustedSetup();
     return TestUtils.getComputeCellsAndKzgProofsTests().stream()

bindings/java/src/testFixtures/java/ethereum/ckzg4844/TestUtils.java

@@ -36,6 +36,7 @@ public class TestUtils {
   private static final String VERIFY_BLOB_KZG_PROOF_TESTS = "../../tests/verify_blob_kzg_proof/";
   private static final String VERIFY_BLOB_KZG_PROOF_BATCH_TESTS =
       "../../tests/verify_blob_kzg_proof_batch/";
+  private static final String COMPUTE_CELLS_TESTS = "../../tests/compute_cells/";
   private static final String COMPUTE_CELLS_AND_KZG_PROOFS_TESTS =
       "../../tests/compute_cells_and_kzg_proofs/";
   private static final String RECOVER_CELLS_AND_KZG_PROOFS_TESTS =
@@ -205,6 +206,24 @@ public static List<VerifyBlobKzgProofBatchTest> getVerifyBlobKzgProofBatchTests(
     return tests.build().collect(Collectors.toList());
   }
 
+  public static List<ComputeCellsTest> getComputeCellsTests() {
+    final Stream.Builder<ComputeCellsTest> tests = Stream.builder();
+    List<String> testFiles = getTestFiles(COMPUTE_CELLS_TESTS);
+    assert !testFiles.isEmpty();
+
+    try {
+      for (String testFile : testFiles) {
+        String jsonData = Files.readString(Path.of(testFile));
+        ComputeCellsTest test = OBJECT_MAPPER.readValue(jsonData, ComputeCellsTest.class);
+        tests.add(test);
+      }
+    } catch (IOException ex) {
+      throw new UncheckedIOException(ex);
+    }
+
+    return tests.build().collect(Collectors.toList());
+  }
+
   public static List<ComputeCellsAndKzgProofsTest> getComputeCellsAndKzgProofsTests() {
     final Stream.Builder<ComputeCellsAndKzgProofsTest> tests = Stream.builder();
     List<String> testFiles = getTestFiles(COMPUTE_CELLS_AND_KZG_PROOFS_TESTS);