Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/Crc32/BUILD

@@ -0,0 +1,25 @@
+
+objc_library(
+    name = "Crc32",
+    enable_modules = True,
+    module_name = "Crc32",
+    srcs = glob([
+        "Sources/**/*.m",
+        "Sources/**/*.h",
+    ], allow_empty = True),
+    hdrs = glob([
+        "PublicHeaders/**/*.h",
+    ]),
+    includes = [
+        "PublicHeaders",
+    ],
+    sdk_frameworks = [
+        "Foundation",
+    ],
+    sdk_dylibs = [
+        "libz",
+    ],
+    visibility = [
+        "//visibility:public",
+    ],
+)

submodules/Crc32/Package.swift

@@ -0,0 +1,32 @@
+// swift-tools-version:5.5
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "Crc32",
+    platforms: [.macOS(.v10_13)],
+    products: [
+        // Products define the executables and libraries a package produces, and make them visible to other packages.
+        .library(
+            name: "Crc32",
+            targets: ["Crc32"]),
+    ],
+    dependencies: [
+        // Dependencies declare other packages that this package depends on.
+        // .package(url: /* package url */, from: "1.0.0"),
+    ],
+    targets: [
+        // Targets are the basic building blocks of a package. A target can define a module or a test suite.
+        // Targets can depend on other targets in this package, and on products in packages this package depends on.
+        .target(
+            name: "Crc32",
+            dependencies: [],
+            path: ".",
+            exclude: ["BUILD"],
+            publicHeadersPath: "PublicHeaders",
+            cSettings: [
+                .headerSearchPath("PublicHeaders")
+            ]),
+    ]
+)

submodules/Crc32/PublicHeaders/Crc32/Crc32.h

@@ -0,0 +1,8 @@
+#ifndef Postbox_Crc32_h
+#define Postbox_Crc32_h
+
+#import <Foundation/Foundation.h>
+
+uint32_t Crc32(const void *bytes, int length);
+
+#endif

submodules/Crc32/Sources/Crc32.m

@@ -0,0 +1,7 @@
+#import <Crc32/Crc32.h>
+
+#import <zlib.h>
+
+uint32_t Crc32(const void *bytes, int length) {
+    return (uint32_t)crc32(0, bytes, (uInt)length);
+}