etc

package module
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 Go to latest Published: Jan 10, 2023 License: MIT Imports: 21 Imported by: 0

README

Etc: Efficient Transfer Coding

license

Etc is a low-level binary encoding package.

It's similar to package bytes with some extra bells and whistles.

Etc in JavaScript

API demo

While being faster than encoding/json, it provides a very similar reflection-based API.

package main

import (
  "github.com/superp00t/etc"
  "github.com/superp00t/etc/yo"
)

type Packet struct {
  ID          uint64
  Location    string
  Coordinates [2]float32
}

func main() {
  pc := Packet{
    ID:       1,
    Location: "Trinity",
    Coordinates: [2]float32{
      33.677216,
      -106.476059,
    },
  }

  data, err := etc.Marshal(pc)
  if err != nil {
    panic(err)
  }

  // Hex dump of "data":
  //
  // 01                     - ID
  // 07                     - 7 byte long string
  //   54 72 69 6e 69 74 79    "Trinity"
  // 78 b5 06 42            - X coordinate float32
  // be f3 d4 c2            - Y coordinate float32
  yo.Spew(data)
  
  var out Packet

  err = etc.Unmarshal(data, &out)
  if err != nil {
    panic(err)
  }
}

Etc also includes cross-platform utilities for easy directory manipulation.

Manual API

// Allocate empty buffer
e := etc.NewBuffer()

// Allocate buffer from string
e := etc.FromString("test")

// Allocate buffer from Base64
e := etc.FromBase64("dGVzdA==")

// Allocate buffer from bytes
e := etc.FromBytes([]byte{'t', 'e', 's', 't'})

// Create buffer as an alias to a file, preserving RAM but costing speed at runtime with disk IO
// Quite useful for parsing large files
e, err := etc.FileController("/tmp/newFile")
if err != nil {
  panic(err)
} else {
  e.Write([]byte("test"))
}

// Load a string from a defined 0-4 sector in buffer, ignoring possible zero padding bytes. This is not recommended and only included to support certain protocols and formats.
e.ReadFixedString(4) // "test"

// Write 64-bit integer to Buffer (using LEB128 integer compression)
e.WriteInt(12345678)

e.ReadInt() // 12345678

e.Base64() // dGVzdM7C8QU= (url encoding)
           //   t     e     s     t     [    12345678 (LEB128) ]
e.Bytes()  // [ 0x74, 0x65, 0x73, 0x74, 0xce, 0xc2, 0xf1, 0x05 ]

Documentation

Index

Constants

View Source 
const (
	B  = 1
	KB = 1024 * B
	MB = 1024 * KB
	GB = 1024 * MB
)

Variables

This section is empty.

Functions

func DecodeSignedVarint 

func DecodeSignedVarint(input io.Reader, limit int) *big.Int

func DecodeUnsignedVarint 

func DecodeUnsignedVarint(input io.Reader, limit int) *big.Int

func EncodeSignedVarint 

func EncodeSignedVarint(output io.Writer, x *big.Int)

func Marshal 

func Marshal(v interface{}) ([]byte, error)

func RandomBigInt 

func RandomBigInt(min, max *big.Int) *big.Int

Random random intergers

func RandomDuration 

func RandomDuration(min, max time.Duration) time.Duration

func RandomIndex 

func RandomIndex(v interface{}) int

func RandomInt 

func RandomInt(min, max int) int

func RandomInt64 

func RandomInt64(min, max int64) int64

func Unmarshal 

func Unmarshal(b []byte, v interface{}) error

Types

type Backend 

type Backend interface {
	Read([]byte) (int, error)
	Write([]byte) (int, error)
	Erase() error
	Seek(offset int64, whence int) (int64, error)
	Size() int64
	Bytes() []byte
	Close() error
}

func FsBackend 

func FsBackend(path string, readOnly bool) (Backend, error)

func MemBackend 

func MemBackend() Backend

type Buffer 

type Buffer struct {
	// contains filtered or unexported fields
}

func DummyReadSeeker 

func DummyReadSeeker(r io.ReadSeeker) *Buffer

func DummyReader 

func DummyReader(r io.Reader, size int64) *Buffer

func DummyWriter 

func DummyWriter(w io.Writer) *Buffer

DummyWriter creates a Buffer using a Backend that can only do simple write operations.

func FileController 

func FileController(path string, readOnly ...bool) (*Buffer, error)

func FromBase64 

func FromBase64(s string) *Buffer

func FromBytes 

func FromBytes(b []byte) *Buffer

FromBytes creates a copy of the supplied slice

func FromReadSeeker 

func FromReadSeeker(sk io.ReadSeeker) *Buffer

func FromString 

func FromString(b string) *Buffer

func NewBuffer 

func NewBuffer() *Buffer

func OfBytes 

func OfBytes(b []byte) *Buffer

OfBytes creates a Buffer using the supplied slice as its backend reader

func (*Buffer) Attach 

func (b *Buffer) Attach(f Backend)

func (*Buffer) Available 

func (b *Buffer) Available() int

func (*Buffer) Base64 

func (b *Buffer) Base64() string

func (*Buffer) Bytes 

func (b *Buffer) Bytes() []byte

func (*Buffer) Close 

func (e *Buffer) Close() error

func (*Buffer) DecodeSignedVarint 

func (bf *Buffer) DecodeSignedVarint(limit int) *big.Int

func (*Buffer) DecodeUnsignedVarint 

func (bf *Buffer) DecodeUnsignedVarint(limit int) *big.Int

func (*Buffer) Delete 

func (e *Buffer) Delete() error

func (*Buffer) Digest 

func (b *Buffer) Digest(hs func() hash.Hash) []byte

func (*Buffer) EncodeSignedVarint 

func (b *Buffer) EncodeSignedVarint(x *big.Int)

func (*Buffer) EncodeUnsignedVarint 

func (b *Buffer) EncodeUnsignedVarint(c *big.Int)

func (*Buffer) Erase 

func (b *Buffer) Erase() error

func (*Buffer) Find 

func (b *Buffer) Find(str []byte) (int64, error)

func (*Buffer) FlushBits 

func (b *Buffer) FlushBits()

func (*Buffer) FlushReadBits 

func (b *Buffer) FlushReadBits()

func (*Buffer) FlushWriteBits 

func (b *Buffer) FlushWriteBits()

func (*Buffer) Jump 

func (b *Buffer) Jump(offset int64)

func (*Buffer) Len 

func (b *Buffer) Len() int

func (*Buffer) Pos 

func (b *Buffer) Pos() int64

func (*Buffer) Read 

func (b *Buffer) Read(buf []byte) (int, error)

func (*Buffer) ReadAt 

func (b *Buffer) ReadAt(p []byte, off int64) (int, error)

func (*Buffer) ReadBigInt 

func (b *Buffer) ReadBigInt() *big.Int

func (*Buffer) ReadBigInt16 

func (b *Buffer) ReadBigInt16() int16

func (*Buffer) ReadBigInt32 

func (b *Buffer) ReadBigInt32() int32

func (*Buffer) ReadBigInt64 

func (b *Buffer) ReadBigInt64() int64

WARNING: Big refers to Big-endian, not as in BigInteger.

func (*Buffer) ReadBigUint16 

func (b *Buffer) ReadBigUint16() uint16

func (*Buffer) ReadBigUint32 

func (b *Buffer) ReadBigUint32() uint32

func (*Buffer) ReadBigUint64 

func (b *Buffer) ReadBigUint64() uint64

func (*Buffer) ReadBool 

func (b *Buffer) ReadBool() bool

func (*Buffer) ReadBoxKey 

func (b *Buffer) ReadBoxKey() *[32]byte

func (*Buffer) ReadBoxNonce 

func (b *Buffer) ReadBoxNonce() *[24]byte

func (*Buffer) ReadByte 

func (b *Buffer) ReadByte() uint8

func (*Buffer) ReadBytes 

func (b *Buffer) ReadBytes(ln int) []byte

func (*Buffer) ReadCString 

func (b *Buffer) ReadCString() string

func (*Buffer) ReadDate 

func (b *Buffer) ReadDate() time.Time

ReadDate returns a timestamp based on milliseconds

func (*Buffer) ReadFixedString 

func (b *Buffer) ReadFixedString(i int) string

func (*Buffer) ReadFloat32 

func (b *Buffer) ReadFloat32() float32

Floats

func (*Buffer) ReadFloat64 

func (b *Buffer) ReadFloat64() float64

func (*Buffer) ReadInt 

func (b *Buffer) ReadInt() int64

func (*Buffer) ReadInt16 

func (b *Buffer) ReadInt16() int16

func (*Buffer) ReadInt32 

func (b *Buffer) ReadInt32() int32

func (*Buffer) ReadInt64 

func (b *Buffer) ReadInt64() int64

func (*Buffer) ReadInt8 

func (b *Buffer) ReadInt8() int8

func (*Buffer) ReadInvertedString 

func (b *Buffer) ReadInvertedString(l int) string

func (*Buffer) ReadLSBit 

func (b *Buffer) ReadLSBit() bool

func (*Buffer) ReadLimitedBytes 

func (b *Buffer) ReadLimitedBytes() []byte

func (*Buffer) ReadMSBit 

func (b *Buffer) ReadMSBit() bool

Etc uses most-significant-bit first encoding of bits. For 8-byte aligned boolean values, refer to ReadBool().

func (*Buffer) ReadRemainder 

func (b *Buffer) ReadRemainder() []byte

func (*Buffer) ReadRune 

func (b *Buffer) ReadRune() (rune, int, error)

func (*Buffer) ReadString 

func (b *Buffer) ReadString(delimiter byte) (string, error)

func (*Buffer) ReadStringUntil 

func (b *Buffer) ReadStringUntil(delimiter rune) string

func (*Buffer) ReadTime 

func (b *Buffer) ReadTime() time.Time

ReadTime returns a timestamp based on nanoseconds

func (*Buffer) ReadTypedInt 

func (b *Buffer) ReadTypedInt(fixed bool, bits int, signed, big bool, v interface{})

Integer functions

func (*Buffer) ReadUString 

func (b *Buffer) ReadUString() string

func (*Buffer) ReadUUID 

func (e *Buffer) ReadUUID() UUID

func (*Buffer) ReadUint 

func (b *Buffer) ReadUint() uint64

func (*Buffer) ReadUint16 

func (b *Buffer) ReadUint16() uint16

func (*Buffer) ReadUint32 

func (b *Buffer) ReadUint32() uint32

func (*Buffer) ReadUint64 

func (b *Buffer) ReadUint64() uint64

func (*Buffer) ReadUntilToken 

func (b *Buffer) ReadUntilToken(s string) (string, error)

func (*Buffer) ReadWChar 

func (b *Buffer) ReadWChar(ln int) string

func (*Buffer) Reverse 

func (b *Buffer) Reverse(offset int64)

func (*Buffer) Runes 

func (b *Buffer) Runes() []rune

func (*Buffer) Seek 

func (b *Buffer) Seek(offset int64, whence int) (int64, error)

func (*Buffer) Size 

func (e *Buffer) Size() int64

func (*Buffer) Start 

func (b *Buffer) Start()

func (*Buffer) String 

func (b *Buffer) String() string

func (*Buffer) ToString 

func (b *Buffer) ToString() string

func (*Buffer) Write 

func (b *Buffer) Write(buf []byte) (int, error)

func (*Buffer) WriteAt 

func (b *Buffer) WriteAt(p []byte, off int64) (int, error)

func (*Buffer) WriteBigInt 

func (b *Buffer) WriteBigInt(v *big.Int)

func (*Buffer) WriteBigInt16 

func (b *Buffer) WriteBigInt16(v int16)

WARNING: Big refers to Big-endian, not as in BigInteger.

func (*Buffer) WriteBigInt32 

func (b *Buffer) WriteBigInt32(v int32)

func (*Buffer) WriteBigInt64 

func (b *Buffer) WriteBigInt64(v int64)

func (*Buffer) WriteBigUint16 

func (b *Buffer) WriteBigUint16(v uint16)

func (*Buffer) WriteBigUint32 

func (b *Buffer) WriteBigUint32(v uint32)

func (*Buffer) WriteBigUint64 

func (b *Buffer) WriteBigUint64(v uint64)

func (*Buffer) WriteBool 

func (b *Buffer) WriteBool(v bool)

func (*Buffer) WriteByte 

func (b *Buffer) WriteByte(v uint8)

func (*Buffer) WriteCString 

func (b *Buffer) WriteCString(v string)

func (*Buffer) WriteDate 

func (b *Buffer) WriteDate(t time.Time)

func (*Buffer) WriteFixedString 

func (b *Buffer) WriteFixedString(i int, v string)

func (*Buffer) WriteFloat32 

func (b *Buffer) WriteFloat32(v float32)

func (*Buffer) WriteFloat64 

func (b *Buffer) WriteFloat64(v float64)

func (*Buffer) WriteInt 

func (b *Buffer) WriteInt(v int64)

func (*Buffer) WriteInt16 

func (b *Buffer) WriteInt16(v int16)

func (*Buffer) WriteInt32 

func (b *Buffer) WriteInt32(v int32)

func (*Buffer) WriteInt64 

func (b *Buffer) WriteInt64(v int64)

func (*Buffer) WriteInt8 

func (b *Buffer) WriteInt8(v int8)

func (*Buffer) WriteInvertedString 

func (b *Buffer) WriteInvertedString(l int, s string)

func (*Buffer) WriteLSBit 

func (b *Buffer) WriteLSBit(bit bool)

func (*Buffer) WriteLimitedBytes 

func (b *Buffer) WriteLimitedBytes(bf []byte)

func (*Buffer) WriteMSBit 

func (b *Buffer) WriteMSBit(bit bool)

func (*Buffer) WriteRandom 

func (b *Buffer) WriteRandom(i int) *Buffer

func (*Buffer) WriteRune 

func (b *Buffer) WriteRune(r rune)

func (*Buffer) WriteTime 

func (b *Buffer) WriteTime(t time.Time)

func (*Buffer) WriteTypedInt 

func (b *Buffer) WriteTypedInt(fixed bool, bits int, signed, big bool, val interface{})

func (*Buffer) WriteUString 

func (b *Buffer) WriteUString(u string)

func (*Buffer) WriteUUID 

func (e *Buffer) WriteUUID(g UUID)

func (*Buffer) WriteUint 

func (b *Buffer) WriteUint(v uint64)

func (*Buffer) WriteUint16 

func (b *Buffer) WriteUint16(v uint16)

func (*Buffer) WriteUint32 

func (b *Buffer) WriteUint32(v uint32)

func (*Buffer) WriteUint64 

func (b *Buffer) WriteUint64(v uint64)

type Decoder 

type Decoder struct {
	*Buffer
}

func NewDecoder 

func NewDecoder(i io.Reader, size int64) *Decoder

func (*Decoder) Decode 

func (d *Decoder) Decode(v interface{}) error

type DiskStatus 

type DiskStatus struct {
	All  uint64 `json:"all"`
	Used uint64 `json:"used"`
	Free uint64 `json:"free"`
}

func GetDiskStatus 

func GetDiskStatus(path string) (*DiskStatus, error)

type Encoder 

type Encoder struct {
	*Buffer
}

func NewEncoder 

func NewEncoder(out io.Writer) *Encoder

func (*Encoder) Encode 

func (e *Encoder) Encode(v interface{}) error

type FixedInt16 

type FixedInt16 = int16

type FixedInt16BE 

type FixedInt16BE = int16

type FixedInt32 

type FixedInt32 = int32

type FixedInt32BE 

type FixedInt32BE = int32

type FixedInt64 

type FixedInt64 = int64

type FixedInt64BE 

type FixedInt64BE = int64

type FixedUint16 

type FixedUint16 = uint16

type FixedUint16BE 

type FixedUint16BE = uint16

type FixedUint32 

type FixedUint32 = uint32

type FixedUint32BE 

type FixedUint32BE = uint32

type FixedUint64 

type FixedUint64 = uint64

type FixedUint64BE 

type FixedUint64BE = uint64

type Path 

type Path []string

func Env 

func Env(key string) Path

func Gopath 

func Gopath() Path

Gopath returns the path of local Go folder. Panics if one cannot be found.

func Goroot 

func Goroot() Path

Goroot attempts to finds your Go installation, panics if one cannot be found.

func HomeDirectory 

func HomeDirectory() Path

func Import 

func Import(path string) Path

func LocalDirectory 

func LocalDirectory() Path

func ParseSystemPath 

func ParseSystemPath(s string) Path

func ParseUnixPath 

func ParseUnixPath(s string) Path

func ParseWindowsPath 

func ParseWindowsPath(s string) Path

func Root 

func Root() Path

func TmpDirectory 

func TmpDirectory() Path

func (Path) Concat 

func (d Path) Concat(s ...string) Path

Concat applies the path with a variadic list of path elements, and returns it.

func (Path) DiskStatus 

func (d Path) DiskStatus() *DiskStatus

func (Path) DiskUsed 

func (d Path) DiskUsed() uint64

func (Path) Exists 

func (d Path) Exists(p string) bool

func (Path) ExistsPath 

func (d Path) ExistsPath(p Path) bool

func (Path) Free 

func (d Path) Free() uint64

func (Path) Get 

func (d Path) Get(path string) (*Buffer, error)

func (Path) GetSub 

func (d Path) GetSub(p Path) Path

func (Path) GetSubFile 

func (d Path) GetSubFile(path Path) (*Buffer, error)

func (Path) GetSubPath 

func (d Path) GetSubPath(p Path) string

func (Path) IsDirectory 

func (d Path) IsDirectory() bool

func (Path) IsExtant 

func (d Path) IsExtant() bool

func (Path) LRU 

func (d Path) LRU() (string, error)

LRU returns the least-recently modified file in a directory.

func (Path) MakeDir 

func (d Path) MakeDir() error

func (Path) MakeDirPath 

func (d Path) MakeDirPath(path Path) error

func (Path) Mkdir 

func (d Path) Mkdir(elements ...string) error

Mkdir accepts a variadic array of string elements, such as "dev", "random"

func (Path) Pop 

func (d Path) Pop() (string, Path)

func (Path) Put 

func (d Path) Put(path string, data io.Reader) error

func (Path) ReadAll 

func (d Path) ReadAll() ([]byte, error)

func (Path) Remove 

func (d Path) Remove() error

func (Path) Render 

func (d Path) Render() string

func (Path) RenderUnix 

func (d Path) RenderUnix() string

func (Path) RenderWin 

func (d Path) RenderWin() string

func (Path) Size 

func (d Path) Size() uint64

func (Path) Stat 

func (d Path) Stat() os.FileInfo

func (Path) String 

func (d Path) String() string

func (Path) Time 

func (d Path) Time() time.Time

func (Path) WriteAll 

func (d Path) WriteAll(b []byte) error

type UUID 

type UUID [16]byte
var NullUUID UUID

func GenerateRandomUUID 

func GenerateRandomUUID() UUID

func ParseUUID 

func ParseUUID(s string) (UUID, error)

func (UUID) Bytes 

func (g UUID) Bytes() []byte

func (UUID) Cmp 

func (g UUID) Cmp(u UUID) bool

func (UUID) MarshalJSON 

func (g UUID) MarshalJSON() ([]byte, error)

func (UUID) MarshalYAML 

func (g UUID) MarshalYAML() (interface{}, error)

func (UUID) String 

func (g UUID) String() string

func (UUID) UnmarshalJSON 

func (g UUID) UnmarshalJSON(b []byte) error

func (UUID) UnmarshalYAML 

func (g UUID) UnmarshalYAML(b interface{}) error

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