[node:fs] `read`, `write` - support large numbers and BigInt (#3556)

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/test/js/node/fs/fs.test.ts b/test/js/node/fs/fs.test.ts
index 272522fc0..3b1688c15 100644
--- a/test/js/node/fs/fs.test.ts
+++ b/test/js/node/fs/fs.test.ts
@@ -278,6 +278,41 @@ it("readdirSync throws when given a file path with trailing slash", () => {
 
 describe("readSync", () => {
   const firstFourBytes = new Uint32Array(new TextEncoder().encode("File").buffer)[0];
+
+  it("works on large files", () => {
+    const dest = join(tmpdir(), "readSync-large-file.txt");
+    rmSync(dest, { force: true });
+
+    const writefd = openSync(dest, "w");
+    writeSync(writefd, Buffer.from([0x10]), 0, 1, 4_900_000_000);
+    closeSync(writefd);
+
+    const fd = openSync(dest, "r");
+    const out = Buffer.alloc(1);
+    const bytes = readSync(fd, out, 0, 1, 4_900_000_000);
+    expect(bytes).toBe(1);
+    expect(out[0]).toBe(0x10);
+    closeSync(fd);
+    rmSync(dest, { force: true });
+  });
+
+  it("works with bigint on read", () => {
+    const dest = join(tmpdir(), "readSync-large-file-bigint.txt");
+    rmSync(dest, { force: true });
+
+    const writefd = openSync(dest, "w");
+    writeSync(writefd, Buffer.from([0x10]), 0, 1, 400);
+    closeSync(writefd);
+
+    const fd = openSync(dest, "r");
+    const out = Buffer.alloc(1);
+    const bytes = readSync(fd, out, 0, 1, 400n as any);
+    expect(bytes).toBe(1);
+    expect(out[0]).toBe(0x10);
+    closeSync(fd);
+    rmSync(dest, { force: true });
+  });
+
   it("works with a position set to 0", () => {
     const fd = openSync(import.meta.dir + "/readFileSync.txt", "r");
     const four = new Uint8Array(4);
@@ -367,6 +402,23 @@ it("preadv", () => {
 });
 
 describe("writeSync", () => {
+  it("works with bigint", () => {
+    const dest = join(tmpdir(), "writeSync-large-file-bigint.txt");
+    rmSync(dest, { force: true });
+
+    const writefd = openSync(dest, "w");
+    writeSync(writefd, Buffer.from([0x10]), 0, 1, 400n as any);
+    closeSync(writefd);
+
+    const fd = openSync(dest, "r");
+    const out = Buffer.alloc(1);
+    const bytes = readSync(fd, out, 0, 1, 400 as any);
+    expect(bytes).toBe(1);
+    expect(out[0]).toBe(0x10);
+    closeSync(fd);
+    rmSync(dest, { force: true });
+  });
+
   it("works with a position set to 0", () => {
     const fd = openSync(import.meta.dir + "/writeFileSync.txt", "w+");
     const four = new Uint8Array(4);