encoding

package
v0.0.1 Latest Latest
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 Go to latest Published: Nov 16, 2022 License: Apache-2.0 Imports: 10 Imported by: 18

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var ErrBufferOverflow = errors.New("buffer overflow when parsing. One of the TLV Length is wrong")
View Source 
var ErrIncorrectDigest = errors.New("the sha256 digest is missing or incorrect")

Functions

This section is empty.

Types

type Buffer 

type Buffer []byte

Buffer is a buffer of bytes

func ShrinkLength 

func ShrinkLength(buf Buffer, shrink int) Buffer

Shrink length reduce the L by `shrink“ in a TLV encoded buffer `buf` 

Precondition:
  `buf` starts with proper Type and Length numbers.
  Length > `shrink`.
  May crash otherwise.

Returns the new buffer containing reduced TL header. May start from the middle of original buffer, but always goes to the end.

type BufferReader 

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

func NewBufferReader 

func NewBufferReader(buf Buffer) *BufferReader

func (*BufferReader) Delegate 

func (r *BufferReader) Delegate(l int) ParseReader

func (*BufferReader) Length 

func (r *BufferReader) Length() int

func (*BufferReader) Pos 

func (r *BufferReader) Pos() int

func (*BufferReader) Range 

func (r *BufferReader) Range(start, end int) Wire

func (*BufferReader) Read 

func (r *BufferReader) Read(b []byte) (int, error)

func (*BufferReader) ReadBuf 

func (r *BufferReader) ReadBuf(l int) (Buffer, error)

func (*BufferReader) ReadByte 

func (r *BufferReader) ReadByte() (byte, error)

func (*BufferReader) ReadWire 

func (r *BufferReader) ReadWire(l int) (Wire, error)

func (*BufferReader) Seek 

func (r *BufferReader) Seek(offset int64, whence int) (int64, error)

func (*BufferReader) Skip 

func (r *BufferReader) Skip(n int) error

func (*BufferReader) UnreadByte 

func (r *BufferReader) UnreadByte() error

type Component 

type Component struct {
	Typ TLNum
	Val []byte
}

func ComponentFromBytes 

func ComponentFromBytes(buf []byte) (Component, error)

func ComponentFromStr 

func ComponentFromStr(s string) (Component, error)

func NewByteOffsetComponent 

func NewByteOffsetComponent(off uint64) Component

func NewBytesComponent 

func NewBytesComponent(typ TLNum, val []byte) Component

func NewNumberComponent 

func NewNumberComponent(typ TLNum, val uint64) Component

func NewSegmentComponent 

func NewSegmentComponent(seg uint64) Component

func NewSequenceNumComponent 

func NewSequenceNumComponent(seq uint64) Component

func NewStringComponent 

func NewStringComponent(typ TLNum, val string) Component

func NewTimestampComponent 

func NewTimestampComponent(t uint64) Component

func NewVersionComponent 

func NewVersionComponent(v uint64) Component

func ParseComponent 

func ParseComponent(buf Buffer) (Component, int)

func ReadComponent 

func ReadComponent(r ParseReader) (Component, error)

func (Component) Bytes 

func (c Component) Bytes() []byte

func (Component) Compare 

func (c Component) Compare(rhs ComponentPattern) int

func (Component) ComponentPatternTrait 

func (c Component) ComponentPatternTrait() ComponentPattern

func (Component) EncodeInto 

func (c Component) EncodeInto(buf Buffer) int

func (Component) EncodingLength 

func (c Component) EncodingLength() int

func (Component) Equal 

func (c Component) Equal(rhs ComponentPattern) bool

func (Component) FromMatching 

func (c Component) FromMatching(m Matching) (*Component, error)

func (Component) IsMatch 

func (c Component) IsMatch(value Component) bool

func (Component) Length 

func (c Component) Length() TLNum

func (Component) Match 

func (Component) Match(value Component, m Matching)

func (Component) String 

func (c Component) String() string

type ComponentPattern 

type ComponentPattern interface {
	// ComponentPatternTrait returns the type trait of Component or Pattern
	// This is used to make ComponentPattern a union type of Component or Pattern
	// Component | Pattern does not work because we need a mixed list NamePattern
	ComponentPatternTrait() ComponentPattern

	String() string

	Compare(ComponentPattern) int

	Equal(ComponentPattern) bool

	IsMatch(value Component) bool

	Match(value Component, m Matching)

	FromMatching(m Matching) (*Component, error)
}

func ComponentPatternFromStr 

func ComponentPatternFromStr(s string) (ComponentPattern, error)

type ErrFailToParse 

type ErrFailToParse struct {
	TypeNum TLNum
	Err     error
}

func (ErrFailToParse) Error 

func (e ErrFailToParse) Error() string

func (ErrFailToParse) Unwrap 

func (e ErrFailToParse) Unwrap() error

type ErrFormat 

type ErrFormat struct {
	Msg string
}

func (ErrFormat) Error 

func (e ErrFormat) Error() string

type ErrIncompatibleType 

type ErrIncompatibleType struct {
	Name    string
	ValType string
	TypeNum TLNum
	Value   any
}

func (ErrIncompatibleType) Error 

func (e ErrIncompatibleType) Error() string

type ErrNotFound 

type ErrNotFound struct {
	Key string
}

func (ErrNotFound) Error 

func (e ErrNotFound) Error() string

type ErrSkipRequired 

type ErrSkipRequired struct {
	Name    string
	TypeNum TLNum
}

func (ErrSkipRequired) Error 

func (e ErrSkipRequired) Error() string

type ErrUnexpected 

type ErrUnexpected struct {
	Err error
}

func (ErrUnexpected) Error 

func (e ErrUnexpected) Error() string

func (ErrUnexpected) Unwrap 

func (e ErrUnexpected) Unwrap() error

type ErrUnrecognizedField 

type ErrUnrecognizedField struct {
	TypeNum TLNum
}

func (ErrUnrecognizedField) Error 

func (e ErrUnrecognizedField) Error() string

type Matching 

type Matching map[string]any

type Name 

type Name []Component

func NameFromBytes 

func NameFromBytes(buf []byte) (Name, error)

func NameFromStr 

func NameFromStr(s string) (Name, error)

func ReadName 

func ReadName(r ParseReader) (Name, error)

ReadName reads a Name from a Wire **excluding** the TL prefix.

func (Name) Bytes 

func (n Name) Bytes() []byte

Bytes returns the encoded bytes of a Name

func (Name) Compare 

func (n Name) Compare(rhs Name) int

func (Name) EncodeInto 

func (n Name) EncodeInto(buf Buffer) int

EncodeInto encodes a Name into a Buffer **excluding** the TL prefix. Please use Bytes() to get the fully encoded name.

func (Name) EncodingLength 

func (n Name) EncodingLength() int

EncodingLength computes a Name's length after encoding **excluding** the TL prefix.

func (Name) Equal 

func (n Name) Equal(rhs Name) bool

func (Name) IsPrefix 

func (n Name) IsPrefix(rhs Name) bool

func (Name) String 

func (n Name) String() string

func (Name) ToFullName 

func (n Name) ToFullName(rawData Wire) Name

type NamePattern 

type NamePattern []ComponentPattern

func NamePatternFromStr 

func NamePatternFromStr(s string) (NamePattern, error)

func (NamePattern) Compare 

func (n NamePattern) Compare(rhs NamePattern) int

func (NamePattern) Equal 

func (n NamePattern) Equal(rhs NamePattern) bool

func (NamePattern) FromMatching 

func (n NamePattern) FromMatching(m Matching) (Name, error)

func (NamePattern) IsPrefix 

func (n NamePattern) IsPrefix(rhs NamePattern) bool

func (NamePattern) Match 

func (n NamePattern) Match(name Name, m Matching)

func (NamePattern) String 

func (n NamePattern) String() string

type Nat 

type Nat uint64

Nat is a TLV natural number

func ParseNat 

func ParseNat(buf Buffer) (val Nat, pos int)

func (Nat) Bytes 

func (v Nat) Bytes() []byte

func (Nat) EncodeInto 

func (v Nat) EncodeInto(buf Buffer) int

func (Nat) EncodingLength 

func (v Nat) EncodingLength() int

type ParseReader 

type ParseReader interface {
	io.Reader
	io.ByteScanner

	// ReadWire reads a list of buffers in place without copy.
	// It always tries to read the required length of bytes.
	ReadWire(l int) (Wire, error)

	// ReadBuf reads a continuous buffer, trying to avoid copy.
	ReadBuf(l int) (Buffer, error)

	// Range returns a wire that contains the bytes between start and end, without copy.
	Range(start, end int) Wire

	// Pos returns the current position in the buffer/wire.
	Pos() int

	// Length returns the length of the buffer/wire.
	Length() int

	// Skip skips the next n bytes.
	Skip(n int) error

	// Delegate returns a new ParseReader that starts from the current position with length l.
	// The result is equivalent to the following:
	//
	//   start := r.Pos()
	//   r.Skip(l)
	//   return r.Range(start, r.Pos())
	Delegate(l int) ParseReader
}

ParseReader is an interface operating on Buffer and Wire

type Pattern 

type Pattern struct {
	Typ TLNum
	Tag string
}

func (Pattern) Compare 

func (p Pattern) Compare(rhs ComponentPattern) int

func (Pattern) ComponentPatternTrait 

func (p Pattern) ComponentPatternTrait() ComponentPattern

func (Pattern) Equal 

func (p Pattern) Equal(rhs ComponentPattern) bool

func (Pattern) FromMatching 

func (p Pattern) FromMatching(m Matching) (*Component, error)

func (Pattern) IsMatch 

func (p Pattern) IsMatch(value Component) bool

func (Pattern) Match 

func (p Pattern) Match(value Component, m Matching)

func (Pattern) String 

func (p Pattern) String() string

type PlaceHolder 

type PlaceHolder struct{}

PlaceHolder is an empty structure that used to give names of procedure arguments.

type TLNum 

type TLNum uint64

TLNum is a TLV Type or Length number 

const (
	TypeInvalidComponent                TLNum = 0x00
	TypeImplicitSha256DigestComponent   TLNum = 0x01
	TypeParametersSha256DigestComponent TLNum = 0x02
	TypeGenericNameComponent            TLNum = 0x08
	TypeKeywordNameComponent            TLNum = 0x20
	TypeSegmentNameComponent            TLNum = 0x32
	TypeByteOffsetNameComponent         TLNum = 0x34
	TypeVersionNameComponent            TLNum = 0x36
	TypeTimestampNameComponent          TLNum = 0x38
	TypeSequenceNumNameComponent        TLNum = 0x3a
)
const TypeName TLNum = 0x07

func ParseTLNum 

func ParseTLNum(buf Buffer) (val TLNum, pos int)

ParseTLNum parses a TLNum from a buffer. It is supposed to be used internally, so panic on index out of bounds.

func ReadTLNum 

func ReadTLNum(r io.ByteReader) (val TLNum, err error)

ReadTLNum reads a TLNum from a io.Reader.

func (TLNum) EncodeInto 

func (v TLNum) EncodeInto(buf Buffer) int

func (TLNum) EncodingLength 

func (v TLNum) EncodingLength() int

type Wire 

type Wire []Buffer

Wire is a collection of Buffer. May be allocated in non-contiguous memory.

func (Wire) Join 

func (w Wire) Join() []byte

func (Wire) Length 

func (w Wire) Length() uint64

type WireReader 

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

WireReader is used for reading from a Wire. It is used when parsing a fragmented packet.

func NewWireReader 

func NewWireReader(w Wire) *WireReader

func (*WireReader) Delegate 

func (r *WireReader) Delegate(l int) ParseReader

func (*WireReader) Length 

func (r *WireReader) Length() int

func (*WireReader) Pos 

func (r *WireReader) Pos() int

func (*WireReader) Range 

func (r *WireReader) Range(start, end int) Wire

func (*WireReader) Read 

func (r *WireReader) Read(b []byte) (int, error)

func (*WireReader) ReadBuf 

func (r *WireReader) ReadBuf(l int) (Buffer, error)

func (*WireReader) ReadByte 

func (r *WireReader) ReadByte() (byte, error)

func (*WireReader) ReadWire 

func (r *WireReader) ReadWire(l int) (Wire, error)

func (*WireReader) Skip 

func (r *WireReader) Skip(n int) error

func (*WireReader) UnreadByte 

func (r *WireReader) UnreadByte() error

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