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bytewriter 
Package bytewriter implements writers that support concurrent writing within a fixed length block
initially tried to use bytes.Buffer but the main restriction with that is that it does not allow the freedom to move around in the buffer. Further, it always writes at the end of the buffer
another attempt was to maintain a position identifier that was always passed to any function that wrote anything and the function had to return the next writable location, which resulted in calls like
pos = writeString(buffer, pos, "mmv")
which became unmaintainable after a while, and along with all the side maintainance looked extremely ugly
then implemented a minimal buffer wrapper that gives the freedom to move around and write anywhere you want, which worked if you only need one position identifier, i.e. only one write operation happens at a time
this implements a writer that supports multiple concurrent writes within a fixed length block
Documentation
¶
Overview ¶
Package bytewriter implements writers that support concurrent writing within a fixed length block
initially tried to use bytes.Buffer but the main restriction with that is that it does not allow the freedom to move around in the buffer. Further, it always writes at the end of the buffer
another attempt was to maintain a position identifier that was always passed to any function that wrote anything and the function *had* to return the next writable location, which resulted in calls like
```go pos = writeString(buffer, pos, "mmv") ```
which became unmaintainable after a while, and along with all the side maintainance looked extremely ugly
then implemented a minimal buffer wrapper that gives the freedom to move around and write anywhere you want, which worked if you only need one position identifier, i.e. only one write operation happens at a time
this implements a writer that supports multiple concurrent writes within a fixed length block
Index ¶
- type ByteWriter
- func (w *ByteWriter) Bytes() []byte
- func (w *ByteWriter) Len() int
- func (w *ByteWriter) MustWrite(data []byte, offset int) int
- func (w *ByteWriter) MustWriteFloat32(val float32, offset int) int
- func (w *ByteWriter) MustWriteFloat64(val float64, offset int) int
- func (w *ByteWriter) MustWriteInt32(val int32, offset int) int
- func (w *ByteWriter) MustWriteInt64(val int64, offset int) int
- func (w *ByteWriter) MustWriteString(val string, offset int) int
- func (w *ByteWriter) MustWriteUint32(val uint32, offset int) int
- func (w *ByteWriter) MustWriteUint64(val uint64, offset int) int
- func (w *ByteWriter) MustWriteVal(val interface{}, offset int) int
- func (w *ByteWriter) Write(data []byte, offset int) (int, error)
- func (w *ByteWriter) WriteFloat32(val float32, offset int) (int, error)
- func (w *ByteWriter) WriteFloat64(val float64, offset int) (int, error)
- func (w *ByteWriter) WriteInt32(val int32, offset int) (int, error)
- func (w *ByteWriter) WriteInt64(val int64, offset int) (int, error)
- func (w *ByteWriter) WriteString(val string, offset int) (int, error)
- func (w *ByteWriter) WriteUint32(val uint32, offset int) (int, error)
- func (w *ByteWriter) WriteUint64(val uint64, offset int) (int, error)
- func (w *ByteWriter) WriteVal(val interface{}, offset int) (int, error)
- type MemoryMappedWriter
- type Writer
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
This section is empty.
Types ¶
type ByteWriter ¶
type ByteWriter struct {
// contains filtered or unexported fields
}
ByteWriter is a simple wrapper over a byte slice that supports writing anywhere
func NewByteWriter ¶
func NewByteWriter(n int) *ByteWriter
NewByteWriter creates a new ByteWriter of the specified size
func NewByteWriterSlice ¶
func NewByteWriterSlice(buffer []byte) *ByteWriter
NewByteWriterSlice creates a new ByteWriter using the passed slice
func (*ByteWriter) Bytes ¶
func (w *ByteWriter) Bytes() []byte
Bytes returns the internal byte array of the ByteWriter
func (*ByteWriter) Len ¶
func (w *ByteWriter) Len() int
Len returns the maximum size of the ByteWriter
func (*ByteWriter) MustWrite ¶
func (w *ByteWriter) MustWrite(data []byte, offset int) int
MustWrite is a write that will panic if Write returns an error
func (*ByteWriter) MustWriteFloat32 ¶
func (w *ByteWriter) MustWriteFloat32(val float32, offset int) int
MustWriteFloat32 panics if WriteFloat32 fails
func (*ByteWriter) MustWriteFloat64 ¶
func (w *ByteWriter) MustWriteFloat64(val float64, offset int) int
MustWriteFloat64 panics if WriteFloat64 fails
func (*ByteWriter) MustWriteInt32 ¶
func (w *ByteWriter) MustWriteInt32(val int32, offset int) int
MustWriteInt32 panics if WriteInt32 fails
func (*ByteWriter) MustWriteInt64 ¶
func (w *ByteWriter) MustWriteInt64(val int64, offset int) int
MustWriteInt64 panics if WriteInt64 fails
func (*ByteWriter) MustWriteString ¶
func (w *ByteWriter) MustWriteString(val string, offset int) int
MustWriteString panics if WriteString fails
func (*ByteWriter) MustWriteUint32 ¶
func (w *ByteWriter) MustWriteUint32(val uint32, offset int) int
MustWriteUint32 panics if WriteInt32 fails
func (*ByteWriter) MustWriteUint64 ¶
func (w *ByteWriter) MustWriteUint64(val uint64, offset int) int
MustWriteUint64 panics if WriteUint64 fails
func (*ByteWriter) MustWriteVal ¶
func (w *ByteWriter) MustWriteVal(val interface{}, offset int) int
MustWriteVal panics if WriteVal fails
func (*ByteWriter) WriteFloat32 ¶
func (w *ByteWriter) WriteFloat32(val float32, offset int) (int, error)
WriteFloat32 writes an float32 to the buffer
func (*ByteWriter) WriteFloat64 ¶
func (w *ByteWriter) WriteFloat64(val float64, offset int) (int, error)
WriteFloat64 writes an float64 to the buffer
func (*ByteWriter) WriteInt32 ¶
func (w *ByteWriter) WriteInt32(val int32, offset int) (int, error)
WriteInt32 writes an int32 to the buffer
func (*ByteWriter) WriteInt64 ¶
func (w *ByteWriter) WriteInt64(val int64, offset int) (int, error)
WriteInt64 writes an int64 to the buffer
func (*ByteWriter) WriteString ¶
func (w *ByteWriter) WriteString(val string, offset int) (int, error)
WriteString writes a string to the buffer
func (*ByteWriter) WriteUint32 ¶
func (w *ByteWriter) WriteUint32(val uint32, offset int) (int, error)
WriteUint32 writes an uint32 to the buffer
func (*ByteWriter) WriteUint64 ¶
func (w *ByteWriter) WriteUint64(val uint64, offset int) (int, error)
WriteUint64 writes an uint64 to the buffer
type MemoryMappedWriter ¶
type MemoryMappedWriter struct {
*ByteWriter
// contains filtered or unexported fields
}
MemoryMappedWriter is a ByteBuffer that is also mapped into memory
func NewMemoryMappedWriter ¶
func NewMemoryMappedWriter(loc string, size int) (*MemoryMappedWriter, error)
NewMemoryMappedWriter will create and return a new instance of a MemoryMappedWriter
func (*MemoryMappedWriter) Unmap ¶
func (b *MemoryMappedWriter) Unmap(removefile bool) error
Unmap will manually delete the memory mapping of a mapped buffer
type Writer ¶
type Writer interface {
Bytes() []byte
Len() int
Write([]byte, int) (int, error)
WriteVal(interface{}, int) (int, error)
WriteString(string, int) (int, error)
WriteInt32(int32, int) (int, error)
WriteInt64(int64, int) (int, error)
WriteUint32(uint32, int) (int, error)
WriteUint64(uint64, int) (int, error)
WriteFloat32(float32, int) (int, error)
WriteFloat64(float64, int) (int, error)
MustWrite([]byte, int) int
MustWriteVal(interface{}, int) int
MustWriteString(string, int) int
MustWriteInt32(int32, int) int
MustWriteInt64(int64, int) int
MustWriteUint32(uint32, int) int
MustWriteUint64(uint64, int) int
MustWriteFloat32(float32, int) int
MustWriteFloat64(float64, int) int
}
Writer defines an abstraction for an object that allows writing of binary values anywhere within a fixed range
Source Files