chore: Bump CRT version to 0.51.0 from 0.48.0

Package.swift

@@ -56,7 +56,7 @@ let package = Package(
     ],
     dependencies: {
         var dependencies: [Package.Dependency] = [
-            .package(url: "https://github.com/awslabs/aws-crt-swift.git", exact: "0.48.0"),
+            .package(url: "https://github.com/awslabs/aws-crt-swift.git", exact: "0.51.0"),
             .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
         ]
         let isDocCEnabled = ProcessInfo.processInfo.environment["AWS_SWIFT_SDK_ENABLE_DOCC"] != nil

Sources/SmithyStreams/FileStream.swift

@@ -140,3 +140,24 @@ public final class FileStream: Stream, @unchecked Sendable {
         close()
     }
 }
+
+fileprivate extension FileHandle {
+    func length() throws -> UInt64 {
+        let length: UInt64
+        let savedPos: UInt64
+        if #available(macOS 11, tvOS 13.4, iOS 13.4, watchOS 6.2, *) {
+            savedPos = try offset()
+            try seekToEnd()
+            length = try offset()
+        } else {
+            savedPos = offsetInFile
+            seekToEndOfFile()
+            length = offsetInFile
+        }
+        guard length != savedPos else {
+            return length
+        }
+        try self.seek(toOffset: savedPos)
+        return length
+    }
+}

Sources/SmithyStreams/StreamableHttpBody.swift

@@ -109,4 +109,12 @@ public class StreamableHttpBody: IStreamable {
             return nil
         }
     }
+
+    public func isEndOfStream() -> Bool {
+        do {
+            return try self.position >= self.length()
+        } catch {
+            return false
+        }
+    }
 }