Merge pull request #3 from tbartelmess/nio-support

Added a package for NIO Support

Author: tbartelmess

Package.swift

@@ -24,10 +24,17 @@ let package = Package(
             swiftSettings: [
             .define("USE_HARDWARE")
         ]),
+        .target(name: "CRC32CNIOSupport",
+                dependencies: ["CRC32C",
+                               .product(name: "NIO", package: "swift-nio")]),
         .target(name: "CIntelCRC"),
         .testTarget(
             name: "CRC32CTests",
             dependencies: ["CRC32C"]),
+        .testTarget(
+            name: "CRC32CNIOSupportTests",
+            dependencies: ["CRC32CNIOSupport",
+                           .product(name: "NIO", package: "swift-nio")]),
         .target(name: "GenerateLookupTable"),
         .target(name: "crc32c-tool",
                 dependencies:["CRC32C",

Sources/CRC32C/CRC32C.swift

@@ -26,6 +26,10 @@ public struct CRC32C {
         update(Array<UInt8>(data))
     }
 
+    public mutating func update<T: RandomAccessCollection>(_ data: T) where T.Element == UInt8 {
+        update(Array<UInt8>(data))
+    }
+
     public mutating func finalize() {
           value = ~value
     }

Sources/CRC32CNIOSupport/ByteBuffer+CRC.swift

@@ -0,0 +1,14 @@
+import NIO
+import CRC32C
+
+extension ByteBuffer {
+    public func crc32(at: Int, length: Int) -> UInt32 {
+        guard let view = self.viewBytes(at: at, length: length) else {
+            return ~0
+        }
+        var crc = CRC32C()
+        crc.update(view)
+        crc.finalize()
+        return crc.value
+    }
+}

Tests/CRC32CNIOSupportTests/ByteBufferTests.swift

@@ -0,0 +1,27 @@
+import XCTest
+import NIO
+import CRC32CNIOSupport
+
+
+final class CRCByteBufferTests: XCTestCase {
+
+
+    func assertCRCByteBufferRoundTrip(bytes: [UInt8], expected: UInt32) {
+        let buffer = ByteBufferAllocator().buffer(bytes: bytes)
+        XCTAssertEqual(buffer.crc32(at: 0, length: buffer.readableBytes), expected)
+    }
+    func testSimpleNumbersCRC32() {
+        let numbers:[UInt8] = [0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef]
+        let expected: UInt32 = 0x2F720F20
+        assertCRCByteBufferRoundTrip(bytes: numbers, expected: expected)
+    }
+
+    func testSimpleData() {
+        let numbers:[UInt8] = [0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, // 64 bit
+                               0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef, // 128 bit
+                               0x01, 0x23, 0x45, 0x67, 0x89, 0xab, 0xcd, 0xef] // 192 bit
+        let expected: UInt32 = 0xBE6DF95B
+        assertCRCByteBufferRoundTrip(bytes: numbers, expected: expected)
+
+    }
+}

Tests/CRC32CNIOSupportTests/XCTestManifests.swift

@@ -0,0 +1,19 @@
+#if !canImport(ObjectiveC)
+import XCTest
+
+extension CRCByteBufferTests {
+    // DO NOT MODIFY: This is autogenerated, use:
+    //   `swift test --generate-linuxmain`
+    // to regenerate.
+    static let __allTests__CRCByteBufferTests = [
+        ("testSimpleData", testSimpleData),
+        ("testSimpleNumbersCRC32", testSimpleNumbersCRC32),
+    ]
+}
+
+public func __allTests() -> [XCTestCaseEntry] {
+    return [
+        testCase(CRCByteBufferTests.__allTests__CRCByteBufferTests),
+    ]
+}
+#endif

Tests/CRC32CTests/CRC32Tests.swift

@@ -1,5 +1,5 @@
 import XCTest
-@testable import CRC32C
+import CRC32C
 
 final class Swift_CRC32Tests: XCTestCase {
     func testSimpleNumbersCRC32() {

Tests/LinuxMain.swift

@@ -1,8 +1,10 @@
 import XCTest
 
+import CRC32CNIOSupportTests
 import CRC32CTests
 
 var tests = [XCTestCaseEntry]()
+tests += CRC32CNIOSupportTests.__allTests()
 tests += CRC32CTests.__allTests()
 
 XCTMain(tests)