if (value < 1024) {
            format = "0";
        } else if (value < 1024L * 1024L) {
            target /= 1024;
            unit = "K";
        } else if (value < 1024L * 1024L * 1024L) {
            target /= 1024;
            target /= 1024;
            unit = "M";
        } else if (value < 1024L * 1024L * 1024L * 1024L) {
            target /= 1024;
            target /= 1024;

  private Platform() {}

  /** Returns a thread-local 1024-char array. */
  static char[] charBufferFromThreadLocal() {
    // requireNonNull accommodates Android's @RecentlyNullable annotation on ThreadLocal.get
    return requireNonNull(DEST_TL.get());
  }

  /**
   * A thread-local destination buffer to keep us from creating new buffers. The starting size is

    val relay = edit(file, upstream, metadata, 1024)
    val source = relay.newSource()
    val sourceBuffer = Buffer()
    assertThat(source!!.read(sourceBuffer, 5)).isEqualTo(5)
    assertThat(sourceBuffer.readUtf8()).isEqualTo("abcde")
    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(8)
    assertThat(sourceBuffer.readUtf8()).isEqualTo("fghijklm")
    assertThat(source.read(sourceBuffer, 1024)).isEqualTo(-1)

)

func BenchmarkRingBuffer_Sync(b *testing.B) {
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		rb.Write(data)
		rb.Read(buf)
	}
}

func BenchmarkRingBuffer_AsyncRead(b *testing.B) {
	// Pretty useless benchmark, but it's here for completeness.
	rb := New(1024)
	data := []byte(strings.Repeat("a", 512))
	buf := make([]byte, 512)

    }

    private String getStatus(long complete, long total) {
        if (total >= 1024) {
            return toKB(complete) + "/" + toKB(total) + " KB ";
        } else if (total >= 0) {
            return complete + "/" + total + " B ";
        } else if (complete >= 1024) {
            return toKB(complete) + " KB ";
        } else {
            return complete + " B ";
        }
    }

            + "]";
    assertEquals(expected, escapeAsString(e, TEST_STRING));
  }

  public void testGrowBuffer() { // need to grow past an initial 1024 byte buffer
    StringBuilder input = new StringBuilder();
    StringBuilder expected = new StringBuilder();
    for (int i = 256; i < 1024; i++) {
      input.append((char) i);
      expected.append("[" + i + "]");
    }

            + "]";
    assertEquals(expected, escapeAsString(e, TEST_STRING));
  }

  public void testGrowBuffer() { // need to grow past an initial 1024 byte buffer
    StringBuilder input = new StringBuilder();
    StringBuilder expected = new StringBuilder();
    for (int i = 256; i < 1024; i++) {
      input.append((char) i);
      expected.append("[" + i + "]");
    }

[![wikipedia](Circular_Buffer_Animation.gif)](https://github.com/smallnest/ringbuffer)

# Usage

```go
package main

import (
	"fmt"

	"github.com/smallnest/ringbuffer"
)

func main() {
	rb := ringbuffer.New(1024)

	// write
	rb.Write([]byte("abcd"))
	fmt.Println(rb.Length())
	fmt.Println(rb.Free())

	// read
	buf := make([]byte, 4)
	rb.Read(buf)
	fmt.Println(string(buf))
}
```

    val builder = OkHttpClient.Builder()
    assertFailsWith<IllegalArgumentException> {
      builder.minWebSocketMessageToCompress(-1024)
    }.also { expected ->
      assertThat(expected.message)
        .isEqualTo("minWebSocketMessageToCompress must be positive: -1024")
    }
  }

  companion object {
    private val DEFAULT_PROXY_SELECTOR = ProxySelector.getDefault()

    assertThrows(FileNotFoundException.class, () -> Files.map(file));
  }

  public void testMap_readWrite() throws IOException {
    // Test data
    int size = 1024;
    byte[] expectedBytes = new byte[size];
    byte[] bytes = newPreFilledByteArray(1024);

    // Setup
    File file = createTempFile();
    Files.write(bytes, file);

    Random random = new Random();
    random.nextBytes(expectedBytes);