// NewChecker ensures that content with the specified length is read from rc.
// Calling Close on this will close upstream.
func NewChecker(rc io.ReadCloser, h hash.Hash, wantSum []byte, length int64) *Checker {
	return &Checker{c: rc, r: ioutil.HardLimitReader(rc, length), h: h, want: wantSum}
}

// Read satisfies io.Reader
func (c Checker) Read(p []byte) (n int, err error) {
	n, err = c.r.Read(p)
	if n > 0 {
		c.h.Write(p[:n])
	}

And it's possible that for your use case, the solution is in one of them.

///

## Read the Tutorial first { #read-the-tutorial-first }

You could still use most of the features in **FastAPI** with the knowledge from the main [Tutorial - User Guide](../tutorial/index.md).

        try (InputStream input = inputStream; ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] buf = new byte[8192];
            int read;
            while ((read = input.read(buf)) >= 0) {
                out.write(buf, 0, read);
            }
            return out.toString(StandardCharsets.UTF_8.name());
        }
    }

        assertTrue(region.hasAccess(RdmaAccess.LOCAL_READ), "Should have local read access");
        assertTrue(region.hasAccess(RdmaAccess.LOCAL_WRITE), "Should have local write access");
        assertFalse(region.hasAccess(RdmaAccess.REMOTE_READ), "Should not have remote read access");

        // Test cleanup
        region.close();

            // Read & Execute
            int readExecute = ACE.FILE_READ_DATA | ACE.FILE_READ_ATTRIBUTES | ACE.FILE_EXECUTE | ACE.READ_CONTROL;
            assertTrue((readExecute & ACE.FILE_READ_DATA) != 0, "Read & Execute should include FILE_READ_DATA");
            assertTrue((readExecute & ACE.FILE_EXECUTE) != 0, "Read & Execute should include FILE_EXECUTE");

        }

        // Fill the receive buffer without holding any locks.
        val read = source.read(receiveBuffer, remainingByteCount)
        if (read == -1L) throw EOFException()
        remainingByteCount -= read

        // Move the received data to the read buffer to the reader can read it. If this source has
        // been closed since this read began we must discard the incoming data and tell the
        // connection we've done so.

            beg_idx = (beg_idx + 1) % pipe_buf.length;
        }
        return result;
    }

    @Override
    public int read(final byte[] b) throws IOException {
        return read(b, 0, b.length);
    }

    @Override
    public int read(final byte[] b, int off, final int len) throws IOException {
        int result = -1;
        int i;

        if (len <= 0) {
            return 0;

            "openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/dict": {
                    "get": {
                        "summary": "Read Dict",
                        "operationId": "read_dict_dict_get",
                        "responses": {
                            "200": {
                                "description": "Successful Response",

    }

    /**
     * Get maximum read/write size
     *
     * @return maximum read/write size in bytes
     */
    public int getMaxReadWriteSize() {
        return maxReadWriteSize;
    }

    /**
     * Set maximum read/write size
     *
     * @param maxReadWriteSize maximum read/write size in bytes
     */

	rc io.ReadCloser
	mu sync.Mutex
}

func (pr *syncReadCloser) Read(p []byte) (n int, err error) {
	// This ensures that Close will block until Read has completed.
	// This allows another goroutine to close the reader.
	pr.mu.Lock()
	defer pr.mu.Unlock()
	if pr.rc == nil {
		return 0, io.EOF
	}
	return pr.rc.Read(p)
}

func (pr *syncReadCloser) Close() error {
	pr.mu.Lock()