feat(ext/ffi): Add static method variants to Deno.UnsafePointerView (#15146)

cli/dts/lib.deno.unstable.d.ts

@@ -535,10 +535,24 @@ declare namespace Deno {
     getFloat64(offset?: number): number;
     /** Gets a C string (null terminated string) at the specified byte offset from the pointer. */
     getCString(offset?: number): string;
+    /** Gets a C string (null terminated string) at the specified byte offset from the specified pointer. */
+    static getCString(pointer: BigInt, offset?: number): string;
     /** Gets an ArrayBuffer of length `byteLength` at the specified byte offset from the pointer. */
     getArrayBuffer(byteLength: number, offset?: number): ArrayBuffer;
-    /** Copies the memory of the pointer into a typed array. Length is determined from the typed array's `byteLength`. Also takes optional offset from the pointer. */
+    /** Gets an ArrayBuffer of length `byteLength` at the specified byte offset from the specified pointer. */
+    static getArrayBuffer(
+      pointer: BigInt,
+      byteLength: number,
+      offset?: number,
+    ): ArrayBuffer;
+    /** Copies the memory of the pointer into a typed array. Length is determined from the typed array's `byteLength`. Also takes optional byte offset from the pointer. */
     copyInto(destination: TypedArray, offset?: number): void;
+    /** Copies the memory of the specified pointer into a typed array. Length is determined from the typed array's `byteLength`. Also takes optional byte offset from the pointer. */
+    static copyInto(
+      pointer: BigInt,
+      destination: TypedArray,
+      offset?: number,
+    ): void;
   }
 
   /**

ext/ffi/00_ffi.js

@@ -121,10 +121,25 @@
       );
     }
 
+    static getCString(pointer, offset = 0) {
+      return core.opSync(
+        "op_ffi_cstr_read",
+        offset ? BigInt(pointer) + BigInt(offset) : pointer,
+      );
+    }
+
     getArrayBuffer(byteLength, offset = 0) {
       return core.opSync(
         "op_ffi_get_buf",
-        offset ? this.pointer + BigInt(offset) : this.pointer,
+        offset ? BigInt(this.pointer) + BigInt(offset) : this.pointer,
+        byteLength,
+      );
+    }
+
+    static getArrayBuffer(pointer, byteLength, offset = 0) {
+      return core.opSync(
+        "op_ffi_get_buf",
+        offset ? BigInt(pointer) + BigInt(offset) : pointer,
         byteLength,
       );
     }
@@ -137,6 +152,15 @@
         destination.byteLength,
       );
     }
+
+    static copyInto(pointer, destination, offset = 0) {
+      core.opSync(
+        "op_ffi_buf_copy_into",
+        offset ? BigInt(pointer) + BigInt(offset) : pointer,
+        destination,
+        destination.byteLength,
+      );
+    }
   }
 
   class UnsafePointer {