initial commits
parent
068d259699
commit
cc99ea7cf8
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@ -0,0 +1,142 @@
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package buffers
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import (
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"github.com/reiver/go-opt"
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"github.com/reiver/go-utf8"
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"io"
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"unsafe"
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)
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// A Buffer is used to store a series of bytes.
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//
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// A Buffer can be used as is, without any type of initialization (if not doesn't want the Buffer to have a limit):
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//
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// var buffer buffers.Buffer
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//
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// But if one wants the Buffer to have a limit, then it should be initialized like the following:
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//
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// var buffer buffers.Buffer = buffers.LimitedBuffer(4194304) // 4 MB
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type Buffer struct {
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data []byte
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max opt.Optional[int]
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}
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var _ io.ByteWriter = &Buffer{}
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var _ io.ReaderFrom = &Buffer{}
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var _ io.Writer = &Buffer{}
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// LimitedBuffer returns a Buffer with a maximum size.
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//
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// var buffer buffers.Buffer = buffers.LimitedBuffer(4194304) // 4 MB
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func LimitedBuffer(max int) Buffer {
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return Buffer {
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max:opt.Something[int](max),
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}
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}
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// Len returns how many bytes have been accumulated in Buffer.
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//
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// receiver.Len() == len(receiver.String())
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func (receiver *Buffer) Len() int {
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if nil == receiver {
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return 0
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}
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return len(receiver.data)
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}
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// ReadFrom reads from the io.Reader. Copying bytes until it gets an io.EOF.
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func (receiver *Buffer) ReadFrom(r io.Reader) (int64, error) {
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if nil == receiver {
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return 0, errNilReceiver
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}
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if nil == r {
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return 0, errNilReader
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}
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return io.Copy(receiver, r)
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}
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// String returns the bytes that have been accumulated.
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func (receiver *Buffer) String() string {
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if nil == receiver {
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return ""
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}
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if nil == receiver.data {
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return ""
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}
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return *(*string)(unsafe.Pointer(&receiver.data))
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}
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func (receiver *Buffer) Write(p []byte) (n int, err error) {
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if nil == receiver {
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return 0, errNilReceiver
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}
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var lenP int
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{
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lenP = len(p)
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if lenP <= 0 {
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return 0, nil
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}
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}
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{
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max, something := receiver.max.Get()
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if something {
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newLen := receiver.Len() + lenP
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if max < newLen {
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return 0, BufferOverflow
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}
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}
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}
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receiver.data = append(receiver.data, p...)
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return len(p), nil
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}
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// WriteByte appends another byte to the Buffer.
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func (receiver *Buffer) WriteByte(c byte) error {
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if nil == receiver {
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return errNilReceiver
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}
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var b [1]byte
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var p []byte = b[:]
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b[0] = c
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{
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n, err := receiver.Write(p)
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if nil != err {
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return err
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}
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if expected, actual := len(b), n; expected != actual {
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return errShortWrite
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}
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}
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return nil
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}
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// WriteRune appends the UTF-8 encoded rune to the Buffer.
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func (receiver *Buffer) WriteRune(r rune) (int, error) {
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if nil == receiver {
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return 0, errNilReceiver
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}
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return utf8.WriteRune(receiver, r)
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}
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// WriteRune appends the string to the Buffer.
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func (receiver *Buffer) WriteString(s string) (int, error) {
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if nil == receiver {
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return 0, errNilReceiver
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}
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return io.WriteString(receiver, s)
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}
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12
errors.go
12
errors.go
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@ -1,10 +1,16 @@
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package buffers
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import (
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"errors"
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"github.com/reiver/go-fck"
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)
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var (
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errNilDestination = errors.New("buffers: Nil Destination")
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errNilReceiver = errors.New("buffers: Nil Receiver")
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BufferOverflow = fck.Error("buffer overflow")
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)
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var (
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errNilDestination = fck.Error("nil destination")
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errNilReader = fck.Error("nil reader")
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errNilReceiver = fck.Error("nil receiver")
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errShortWrite = fck.Error("short write")
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)
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@ -0,0 +1,9 @@
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module github.com/reiver/go-buffers
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go 1.18
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require (
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github.com/reiver/go-fck v0.0.1 // indirect
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github.com/reiver/go-opt v1.3.0 // indirect
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github.com/reiver/go-utf8 v2.0.1+incompatible // indirect
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)
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@ -0,0 +1,6 @@
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github.com/reiver/go-fck v0.0.1 h1:GhOiIp/4Au3iPUVC1YRfJJS5CdvLDNF9qt/n1lwgWnM=
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github.com/reiver/go-fck v0.0.1/go.mod h1:i77J0nD9GkSF0osPcURZbv9u19F0keF/mrhkgIu9wvM=
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github.com/reiver/go-opt v1.3.0 h1:DyDUwxXiRuszOFQxVkjJx52Rrhcr8jpTGrwn/KHA77A=
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github.com/reiver/go-opt v1.3.0/go.mod h1:/GNk2aLHdf9WB/ATueDbAYCaQETT6Bq+PPOKhV1qV0U=
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github.com/reiver/go-utf8 v2.0.1+incompatible h1:f1rRbwTIcUaX+1wnLM1+FWelKegAxTURE9MkZCRVOPM=
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github.com/reiver/go-utf8 v2.0.1+incompatible/go.mod h1:tfGntNDUeEZIAsz0mTu0lF7/IlErc+BpQgO6yxYmJig=
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@ -0,0 +1,414 @@
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package buffers_test
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import (
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"github.com/reiver/go-buffers"
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"testing"
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)
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func TestLimitedBuffer_oneByteAtATime(t *testing.T) {
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tests := []struct{
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Data string
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Expected string
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Limit int
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}{
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "",
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Limit: 0,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0",
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Limit: 1,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "01",
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Limit: 2,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "012",
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Limit: 3,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123",
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Limit: 4,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "01234",
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Limit: 5,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "012345",
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Limit: 6,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456",
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Limit: 7,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "01234567",
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Limit: 8,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "012345678",
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Limit: 9,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789",
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Limit: 10,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"A",
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Limit: 11,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"AB",
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Limit: 12,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABC",
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Limit: 13,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCD",
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Limit: 14,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDE",
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Limit: 15,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXY",
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Limit: 35,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
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Limit: 36,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"a",
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Limit: 37,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"ab",
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Limit: 38,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abc",
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Limit: 39,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvw",
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Limit: 59,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwx",
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Limit: 60,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxy",
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Limit: 61,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Limit: 62,
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},
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}
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loop: for testNumber, test := range tests {
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{
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var buffer buffers.Buffer = buffers.LimitedBuffer(test.Limit)
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var i int
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for i=0; i<test.Limit; i++ {
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var b [1]byte
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var p []byte = b[:]
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b[0] = test.Data[i]
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n, err := buffer.Write(p)
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if nil != err {
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t.Errorf("For test #%d, did not expect an error but actually got one,", testNumber)
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t.Logf("ERROR: (%T) %q", err, err)
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t.Logf("DATA: %q", test.Data)
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t.Logf("EXPECTED-DATA: %q", test.Expected)
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t.Logf("ACTUAL-DATA: %q", buffer.String())
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t.Logf("LIMIT: %d", test.Limit)
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continue loop
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}
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if expected, actual := 1, n; expected != actual {
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t.Errorf("For test #%d, the actual number of bytes written is not what was expected.", testNumber)
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t.Logf("EXPECTED: %d", expected)
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t.Logf("ACTUAL: %d", actual)
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t.Logf("DATA: %q", test.Data)
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t.Logf("EXPECTED-DATA: %q", test.Expected)
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t.Logf("ACTUAL-DATA: %q", buffer.String())
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continue loop
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}
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}
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{
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var b [1]byte
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var p []byte = b[:]
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if len(test.Data) < i {
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b[0] = test.Data[i]
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} else {
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b[0] = '?'
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}
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n, err := buffer.Write(p)
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if nil == err {
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t.Errorf("For test #%d, expected an error but did not actually get one,", testNumber)
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t.Logf("ERROR: (%T) %q", err, err)
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t.Logf("DATA: %q", test.Data)
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t.Logf("EXPECTED-DATA: %q", test.Expected)
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t.Logf("ACTUAL-DATA: %q", buffer.String())
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t.Logf("LIMIT: %d", test.Limit)
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continue loop
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}
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if buffers.BufferOverflow != err {
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t.Errorf("For test #%d, expected a buffer-overflow error but actually got a different error.", testNumber)
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t.Logf("ERROR: (%T) %q", err, err)
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t.Logf("DATA: %q", test.Data)
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t.Logf("EXPECTED-DATA: %q", test.Expected)
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t.Logf("ACTUAL-DATA: %q", buffer.String())
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t.Logf("LIMIT: %d", test.Limit)
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continue loop
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}
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if expected, actual := 0, n; expected != actual {
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t.Errorf("For test #%d, the actual number of bytes written is not what was expected.", testNumber)
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t.Logf("EXPECTED: %d", expected)
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t.Logf("ACTUAL: %d", actual)
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t.Logf("DATA: %q", test.Data)
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t.Logf("EXPECTED-DATA: %q", test.Expected)
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t.Logf("ACTUAL-DATA: %q", buffer.String())
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continue loop
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}
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}
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{
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var expected string = test.Expected
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var actual string = buffer.String()
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if expected != actual {
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t.Errorf("For test #%d, the actual value in the buffer is not what was expected.", testNumber)
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t.Logf("EXPECTED: %q", expected)
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t.Logf("ACTUAL: %q", actual)
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t.Logf("DATA: %q", test.Data)
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t.Logf("LIMIT: %d", test.Limit)
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continue loop
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}
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}
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}
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}
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}
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func TestLimitedBuffer_all(t *testing.T) {
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tests := []struct{
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Data string
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Expected string
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Limit int
|
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}{
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{
|
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "",
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Limit: 0,
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},
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{
|
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0",
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Limit: 1,
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},
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{
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "01",
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Limit: 2,
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},
|
||||
{
|
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
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Expected: "012",
|
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Limit: 3,
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},
|
||||
{
|
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "0123",
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Limit: 4,
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},
|
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{
|
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Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
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Expected: "01234",
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Limit: 5,
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},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
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Expected: "012345",
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Limit: 6,
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},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456",
|
||||
Limit: 7,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "01234567",
|
||||
Limit: 8,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "012345678",
|
||||
Limit: 9,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789",
|
||||
Limit: 10,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"A",
|
||||
Limit: 11,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"AB",
|
||||
Limit: 12,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABC",
|
||||
Limit: 13,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCD",
|
||||
Limit: 14,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDE",
|
||||
Limit: 15,
|
||||
},
|
||||
|
||||
|
||||
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXY",
|
||||
Limit: 35,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ",
|
||||
Limit: 36,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"a",
|
||||
Limit: 37,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"ab",
|
||||
Limit: 38,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abc",
|
||||
Limit: 39,
|
||||
},
|
||||
|
||||
|
||||
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvw",
|
||||
Limit: 59,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwx",
|
||||
Limit: 60,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxy",
|
||||
Limit: 61,
|
||||
},
|
||||
{
|
||||
Data: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Expected: "0123456789"+"ABCDEFGHIJKLMNOPQRSTUVWXYZ"+"abcdefghijklmnopqrstuvwxyz",
|
||||
Limit: 62,
|
||||
},
|
||||
}
|
||||
|
||||
loop: for testNumber, test := range tests {
|
||||
|
||||
var limit int = len(test.Expected)
|
||||
|
||||
var buffer buffers.Buffer = buffers.LimitedBuffer(limit)
|
||||
|
||||
n, err := buffer.Write([]byte(test.Expected))
|
||||
if nil != err {
|
||||
t.Errorf("For test #%d, did not expect an error but actually got one,", testNumber)
|
||||
t.Logf("ERROR: (%T) %q", err, err)
|
||||
t.Logf("DATA: %q", test.Data)
|
||||
t.Logf("EXPECTED-DATA: %q", test.Expected)
|
||||
t.Logf("ACTUAL-DATA: %q", buffer.String())
|
||||
t.Logf("LIMIT: %d", test.Limit)
|
||||
continue loop
|
||||
}
|
||||
if expected, actual := limit, n; expected != actual {
|
||||
t.Errorf("For test #%d, the actual number of bytes written is not what was expected.", testNumber)
|
||||
t.Logf("EXPECTED: %d", expected)
|
||||
t.Logf("ACTUAL: %d", actual)
|
||||
t.Logf("DATA: %q", test.Data)
|
||||
t.Logf("EXPECTED-DATA: %q", test.Expected)
|
||||
continue loop
|
||||
}
|
||||
{
|
||||
var expected string = test.Expected
|
||||
var actual string = buffer.String()
|
||||
|
||||
if expected != actual {
|
||||
t.Errorf("For test #%d, the actual value in the buffer is not what was expected.", testNumber)
|
||||
t.Logf("EXPECTED: %q", expected)
|
||||
t.Logf("ACTUAL: %q", actual)
|
||||
t.Logf("DATA: %q", test.Data)
|
||||
t.Logf("LIMIT: %d", test.Limit)
|
||||
continue loop
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue