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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:14:23 +0000
commit73df946d56c74384511a194dd01dbe099584fd1a (patch)
treefd0bcea490dd81327ddfbb31e215439672c9a068 /src/encoding/binary/example_test.go
parentInitial commit. (diff)
downloadgolang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.tar.xz
golang-1.16-73df946d56c74384511a194dd01dbe099584fd1a.zip
Adding upstream version 1.16.10.upstream/1.16.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/encoding/binary/example_test.go')
-rw-r--r--src/encoding/binary/example_test.go187
1 files changed, 187 insertions, 0 deletions
diff --git a/src/encoding/binary/example_test.go b/src/encoding/binary/example_test.go
new file mode 100644
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+++ b/src/encoding/binary/example_test.go
@@ -0,0 +1,187 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package binary_test
+
+import (
+ "bytes"
+ "encoding/binary"
+ "fmt"
+ "math"
+)
+
+func ExampleWrite() {
+ buf := new(bytes.Buffer)
+ var pi float64 = math.Pi
+ err := binary.Write(buf, binary.LittleEndian, pi)
+ if err != nil {
+ fmt.Println("binary.Write failed:", err)
+ }
+ fmt.Printf("% x", buf.Bytes())
+ // Output: 18 2d 44 54 fb 21 09 40
+}
+
+func ExampleWrite_multi() {
+ buf := new(bytes.Buffer)
+ var data = []interface{}{
+ uint16(61374),
+ int8(-54),
+ uint8(254),
+ }
+ for _, v := range data {
+ err := binary.Write(buf, binary.LittleEndian, v)
+ if err != nil {
+ fmt.Println("binary.Write failed:", err)
+ }
+ }
+ fmt.Printf("%x", buf.Bytes())
+ // Output: beefcafe
+}
+
+func ExampleRead() {
+ var pi float64
+ b := []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40}
+ buf := bytes.NewReader(b)
+ err := binary.Read(buf, binary.LittleEndian, &pi)
+ if err != nil {
+ fmt.Println("binary.Read failed:", err)
+ }
+ fmt.Print(pi)
+ // Output: 3.141592653589793
+}
+
+func ExampleRead_multi() {
+ b := []byte{0x18, 0x2d, 0x44, 0x54, 0xfb, 0x21, 0x09, 0x40, 0xff, 0x01, 0x02, 0x03, 0xbe, 0xef}
+ r := bytes.NewReader(b)
+
+ var data struct {
+ PI float64
+ Uate uint8
+ Mine [3]byte
+ Too uint16
+ }
+
+ if err := binary.Read(r, binary.LittleEndian, &data); err != nil {
+ fmt.Println("binary.Read failed:", err)
+ }
+
+ fmt.Println(data.PI)
+ fmt.Println(data.Uate)
+ fmt.Printf("% x\n", data.Mine)
+ fmt.Println(data.Too)
+ // Output:
+ // 3.141592653589793
+ // 255
+ // 01 02 03
+ // 61374
+}
+
+func ExampleByteOrder_put() {
+ b := make([]byte, 4)
+ binary.LittleEndian.PutUint16(b[0:], 0x03e8)
+ binary.LittleEndian.PutUint16(b[2:], 0x07d0)
+ fmt.Printf("% x\n", b)
+ // Output:
+ // e8 03 d0 07
+}
+
+func ExampleByteOrder_get() {
+ b := []byte{0xe8, 0x03, 0xd0, 0x07}
+ x1 := binary.LittleEndian.Uint16(b[0:])
+ x2 := binary.LittleEndian.Uint16(b[2:])
+ fmt.Printf("%#04x %#04x\n", x1, x2)
+ // Output:
+ // 0x03e8 0x07d0
+}
+
+func ExamplePutUvarint() {
+ buf := make([]byte, binary.MaxVarintLen64)
+
+ for _, x := range []uint64{1, 2, 127, 128, 255, 256} {
+ n := binary.PutUvarint(buf, x)
+ fmt.Printf("%x\n", buf[:n])
+ }
+ // Output:
+ // 01
+ // 02
+ // 7f
+ // 8001
+ // ff01
+ // 8002
+}
+
+func ExamplePutVarint() {
+ buf := make([]byte, binary.MaxVarintLen64)
+
+ for _, x := range []int64{-65, -64, -2, -1, 0, 1, 2, 63, 64} {
+ n := binary.PutVarint(buf, x)
+ fmt.Printf("%x\n", buf[:n])
+ }
+ // Output:
+ // 8101
+ // 7f
+ // 03
+ // 01
+ // 00
+ // 02
+ // 04
+ // 7e
+ // 8001
+}
+
+func ExampleUvarint() {
+ inputs := [][]byte{
+ {0x01},
+ {0x02},
+ {0x7f},
+ {0x80, 0x01},
+ {0xff, 0x01},
+ {0x80, 0x02},
+ }
+ for _, b := range inputs {
+ x, n := binary.Uvarint(b)
+ if n != len(b) {
+ fmt.Println("Uvarint did not consume all of in")
+ }
+ fmt.Println(x)
+ }
+ // Output:
+ // 1
+ // 2
+ // 127
+ // 128
+ // 255
+ // 256
+}
+
+func ExampleVarint() {
+ inputs := [][]byte{
+ {0x81, 0x01},
+ {0x7f},
+ {0x03},
+ {0x01},
+ {0x00},
+ {0x02},
+ {0x04},
+ {0x7e},
+ {0x80, 0x01},
+ }
+ for _, b := range inputs {
+ x, n := binary.Varint(b)
+ if n != len(b) {
+ fmt.Println("Varint did not consume all of in")
+ }
+ fmt.Println(x)
+ }
+ // Output:
+ // -65
+ // -64
+ // -2
+ // -1
+ // 0
+ // 1
+ // 2
+ // 63
+ // 64
+}