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authorKevin Chabowski <kevin@kch42.de>2013-08-06 14:14:10 +0200
committerKevin Chabowski <kevin@kch42.de>2013-08-06 14:14:10 +0200
commit944c2c74c0756e6b768757475546da459d06e95e (patch)
treeb840c791843da83eece39e4e4ee862af5d15aa98
downloadkagus-944c2c74c0756e6b768757475546da459d06e95e.tar.gz
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Initial commit.
-rw-r--r--LICENSE4
-rw-r--r--LimitedWriter.go39
-rw-r--r--LimitedWriter_test.go33
-rw-r--r--Nirvana.go19
-rw-r--r--README8
-rw-r--r--ReadByte.go23
-rw-r--r--doc.go2
-rw-r--r--strings.go35
8 files changed, 163 insertions, 0 deletions
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..68d0481
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,4 @@
+ DO WHATEVER THE FUCK YOU WANT, PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. You just DO WHATEVER THE FUCK YOU WANT. \ No newline at end of file
diff --git a/LimitedWriter.go b/LimitedWriter.go
new file mode 100644
index 0000000..4d23322
--- /dev/null
+++ b/LimitedWriter.go
@@ -0,0 +1,39 @@
+package kagus
+
+import (
+ "errors"
+ "io"
+)
+
+var (
+ WriteLimitReached = errors.New("Write limit reached")
+)
+
+// LimitWriter wraps around a io.Writer and limits the amount of bytes that can be written to it.
+type LimitedWriter struct {
+ W io.Writer
+ N int64
+}
+
+// Write writes at most lw.N bytes to LimitWriter. It updates lw.N on sucessful write operations.
+// If the limit was reached, the error WriteLimitReached will be returned.
+func (lw *LimitedWriter) Write(p []byte) (int, error) {
+ towrite := int64(len(p))
+ if lw.N < towrite {
+ towrite = lw.N
+ }
+
+ n, err := lw.W.Write(p[:towrite])
+ if err != nil {
+ lw.N = 0
+ return n, err
+ }
+
+ if n == len(p) {
+ lw.N -= int64(n)
+ return n, nil
+ }
+
+ lw.N = 0
+ return n, WriteLimitReached
+}
diff --git a/LimitedWriter_test.go b/LimitedWriter_test.go
new file mode 100644
index 0000000..5af9d71
--- /dev/null
+++ b/LimitedWriter_test.go
@@ -0,0 +1,33 @@
+package kagus
+
+import (
+ "bytes"
+ "testing"
+)
+
+func TestLimitedWriting(t *testing.T) {
+ buf := new(bytes.Buffer)
+ lw := &LimitedWriter{buf, 10}
+
+ if _, err := lw.Write([]byte{1, 2}); err != nil {
+ t.Fatalf("lw.Write failed: %s", err)
+ }
+
+ if lw.N != 8 {
+ t.Fatalf("lw.N was supposed to be 8, is %d", lw.N)
+ }
+
+ if !bytes.Equal(buf.Bytes(), []byte{1, 2}) {
+ t.Errorf("Unexpected content of buf: %v", buf.Bytes())
+ }
+
+ n, err := lw.Write([]byte{3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13})
+ if (n != 8) || (err != WriteLimitReached) {
+ t.Fatalf("lw.Write returned with unexpected n, err: %d, %s", n, err)
+ }
+
+ n, err = lw.Write([]byte("trololo"))
+ if (n != 0) || (err != WriteLimitReached) {
+ t.Fatalf("lw.Write returned with unexpected n, err: %d, %s", n, err)
+ }
+}
diff --git a/Nirvana.go b/Nirvana.go
new file mode 100644
index 0000000..1aef1f0
--- /dev/null
+++ b/Nirvana.go
@@ -0,0 +1,19 @@
+package kagus
+
+// NirvanaWriter implements io.WriteCloser and discards everything written to it
+type NirvanaWriter struct{}
+
+// NewNirvanaWriter returns a new NirvanaWriter
+func NewNirvanaWriter() *NirvanaWriter {
+ return new(NirvanaWriter)
+}
+
+// Write function for the io.Writer interface
+func (nw *NirvanaWriter) Write(p []byte) (int, error) {
+ return len(p), nil
+}
+
+// Close doesn't do anything and returns the error nil
+func (nw *NirvanaWriter) Close() error {
+ return nil
+}
diff --git a/README b/README
new file mode 100644
index 0000000..6711fcc
--- /dev/null
+++ b/README
@@ -0,0 +1,8 @@
+Kevin's Awesome Go Utility Stuff
+================================
+
+Some utility stuff I use in some of my Go programs / libraries.
+
+Get it with:
+
+go get github.com/kagus
diff --git a/ReadByte.go b/ReadByte.go
new file mode 100644
index 0000000..75f843b
--- /dev/null
+++ b/ReadByte.go
@@ -0,0 +1,23 @@
+package kagus
+
+import (
+ "io"
+)
+
+// ReadByte reads a single byte from a reader
+func ReadByte(r io.Reader) (byte, error) {
+ buf := make([]byte, 1)
+
+ for {
+ n, err := r.Read(buf)
+ if n == 1 {
+ break
+ }
+
+ if err != nil {
+ return 0, err
+ }
+ }
+
+ return buf[0], nil
+}
diff --git a/doc.go b/doc.go
new file mode 100644
index 0000000..1dccbb8
--- /dev/null
+++ b/doc.go
@@ -0,0 +1,2 @@
+// Package kagus (Kevin's Awesome Go Utility Stuff) is a collection of small utility stuff I use in my Go code.
+package kagus
diff --git a/strings.go b/strings.go
new file mode 100644
index 0000000..555f5dd
--- /dev/null
+++ b/strings.go
@@ -0,0 +1,35 @@
+package kagus
+
+import (
+ "strings"
+ "unicode"
+)
+
+// StringConsistsOf tests, if f returns true for all runes in s
+func StringConsistsOf(s string, f func(rune) bool) bool {
+ for _, r := range s {
+ if !f(r) {
+ return false
+ }
+ }
+ return true
+}
+
+// IsASCII tests, if a Rune is in the ASCII set
+func IsASCII(r rune) bool {
+ return (r <= unicode.MaxASCII)
+}
+
+// Indent a string s by prefixing each line with ind.
+func Indent(s string, ind string) (rv string) {
+ ls := strings.Split(s, "\n")
+ first := true
+ for _, l := range ls {
+ if !first {
+ rv += "\n"
+ }
+ rv += ind + l
+ first = false
+ }
+ return
+}