common.go

// Copyright (c) 2013-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package wire

import (
	"crypto/rand"
	"encoding/binary"
	"fmt"
	"io"
	"math"
)

const (
	// MaxVarIntPayload is the maximum payload size for a variable length integer.
	MaxVarIntPayload = 9

	// binaryFreeListMaxItems is the number of buffers to keep in the free
	// list to use for binary serialization and deserialization.
	binaryFreeListMaxItems = 1024
)

var (
	// littleEndian is a convenience variable since binary.LittleEndian is
	// quite long.
	littleEndian = binary.LittleEndian

	// bigEndian is a convenience variable since binary.BigEndian is quite
	// long.
	bigEndian = binary.BigEndian
)

// binaryFreeList defines a concurrent safe free list of byte slices (up to the
// maximum number defined by the binaryFreeListMaxItems constant) that have a
// cap of 8 (thus it supports up to a uint64).  It is used to provide temporary
// buffers for serializing and deserializing primitive numbers to and from their
// binary encoding in order to greatly reduce the number of allocations
// required.
//
// For convenience, functions are provided for each of the primitive unsigned
// integers that automatically obtain a buffer from the free list, perform the
// necessary binary conversion, read from or write to the given io.Reader or
// io.Writer, and return the buffer to the free list.
type binaryFreeList chan []byte

// Borrow returns a byte slice from the free list with a length of 8.  A new
// buffer is allocated if there are not any available on the free list.
func (l binaryFreeList) Borrow() []byte {
	var buf []byte
	select {
	case buf = <-l:
	default:
		buf = make([]byte, 8)
	}
	return buf[:8]
}

// Return puts the provided byte slice back on the free list.  The buffer MUST
// have been obtained via the Borrow function and therefore have a cap of 8.
func (l binaryFreeList) Return(buf []byte) {
	select {
	case l <- buf:
	default:
		// Let it go to the garbage collector.
	}
}

// Uint8 reads a single byte from the provided reader using a buffer from the
// free list and returns it as a uint8.
func (l binaryFreeList) Uint8(r io.Reader) (uint8, error) {
	buf := l.Borrow()[:1]
	if _, err := io.ReadFull(r, buf); err != nil {
		l.Return(buf)
		return 0, err
	}
	rv := buf[0]
	l.Return(buf)
	return rv, nil
}

// Uint16 reads two bytes from the provided reader using a buffer from the
// free list, converts it to a number using the provided byte order, and returns
// the resulting uint16.
func (l binaryFreeList) Uint16(r io.Reader, byteOrder binary.ByteOrder) (uint16, error) {
	buf := l.Borrow()[:2]
	if _, err := io.ReadFull(r, buf); err != nil {
		l.Return(buf)
		return 0, err
	}
	rv := byteOrder.Uint16(buf)
	l.Return(buf)
	return rv, nil
}

// Uint32 reads four bytes from the provided reader using a buffer from the
// free list, converts it to a number using the provided byte order, and returns
// the resulting uint32.
func (l binaryFreeList) Uint32(r io.Reader, byteOrder binary.ByteOrder) (uint32, error) {
	buf := l.Borrow()[:4]
	if _, err := io.ReadFull(r, buf); err != nil {
		l.Return(buf)
		return 0, err
	}
	rv := byteOrder.Uint32(buf)
	l.Return(buf)
	return rv, nil
}

// Uint64 reads eight bytes from the provided reader using a buffer from the
// free list, converts it to a number using the provided byte order, and returns
// the resulting uint64.
func (l binaryFreeList) Uint64(r io.Reader, byteOrder binary.ByteOrder) (uint64, error) {
	buf := l.Borrow()[:8]
	if _, err := io.ReadFull(r, buf); err != nil {
		l.Return(buf)
		return 0, err
	}
	rv := byteOrder.Uint64(buf)
	l.Return(buf)
	return rv, nil
}

// PutUint8 copies the provided uint8 into a buffer from the free list and
// writes the resulting byte to the given writer.
func (l binaryFreeList) PutUint8(w io.Writer, val uint8) error {
	buf := l.Borrow()[:1]
	buf[0] = val
	_, err := w.Write(buf)
	l.Return(buf)
	return err
}

// PutUint16 serializes the provided uint16 using the given byte order into a
// buffer from the free list and writes the resulting two bytes to the given
// writer.
func (l binaryFreeList) PutUint16(w io.Writer, byteOrder binary.ByteOrder, val uint16) error {
	buf := l.Borrow()[:2]
	byteOrder.PutUint16(buf, val)
	_, err := w.Write(buf)
	l.Return(buf)
	return err
}

// PutUint32 serializes the provided uint32 using the given byte order into a
// buffer from the free list and writes the resulting four bytes to the given
// writer.
func (l binaryFreeList) PutUint32(w io.Writer, byteOrder binary.ByteOrder, val uint32) error {
	buf := l.Borrow()[:4]
	byteOrder.PutUint32(buf, val)
	_, err := w.Write(buf)
	l.Return(buf)
	return err
}

// PutUint64 serializes the provided uint64 using the given byte order into a
// buffer from the free list and writes the resulting eight bytes to the given
// writer.
func (l binaryFreeList) PutUint64(w io.Writer, byteOrder binary.ByteOrder, val uint64) error {
	buf := l.Borrow()[:8]
	byteOrder.PutUint64(buf, val)
	_, err := w.Write(buf)
	l.Return(buf)
	return err
}

// binarySerializer provides a free list of buffers to use for serializing and
// deserializing primitive integer values to and from io.Readers and io.Writers.
var binarySerializer binaryFreeList = make(chan []byte, binaryFreeListMaxItems)

// ReadVarInt reads a variable length integer from r and returns it as a uint64.
func ReadVarInt(r io.Reader) (uint64, error) {
	discriminant, err := binarySerializer.Uint8(r)
	if err != nil {
		return 0, err
	}

	var rv uint64
	switch discriminant {
	case 0xff:
		sv, err := binarySerializer.Uint64(r, littleEndian)
		if err != nil {
			return 0, err
		}
		rv = sv

		// The encoding is not canonical if the value could have been
		// encoded using fewer bytes.
		min := uint64(0x100000000)
		if rv < min {
			return 0, fmt.Errorf("%s: %s", "ReadVarInt", fmt.Sprintf("errNonCanonicalVarInt: %v %v %v", rv, discriminant, min))
		}

	case 0xfe:
		sv, err := binarySerializer.Uint32(r, littleEndian)
		if err != nil {
			return 0, err
		}
		rv = uint64(sv)

		// The encoding is not canonical if the value could have been
		// encoded using fewer bytes.
		min := uint64(0x10000)
		if rv < min {
			return 0, fmt.Errorf("%s: %s", "ReadVarInt", fmt.Sprintf("errNonCanonicalVarInt: %v %v %v", rv, discriminant, min))
		}

	case 0xfd:
		sv, err := binarySerializer.Uint16(r, littleEndian)
		if err != nil {
			return 0, err
		}
		rv = uint64(sv)

		// The encoding is not canonical if the value could have been
		// encoded using fewer bytes.
		min := uint64(0xfd)
		if rv < min {
			return 0, fmt.Errorf("%s: %s", "ReadVarInt", fmt.Sprintf("errNonCanonicalVarInt: %v %v %v", rv, discriminant, min))
		}

	default:
		rv = uint64(discriminant)
	}

	return rv, nil
}

// WriteVarInt serializes val to w using a variable number of bytes depending
// on its value.
func WriteVarInt(w io.Writer, val uint64) error {
	if val < 0xfd {
		return binarySerializer.PutUint8(w, uint8(val))
	}

	if val <= math.MaxUint16 {
		err := binarySerializer.PutUint8(w, 0xfd)
		if err != nil {
			return err
		}
		return binarySerializer.PutUint16(w, littleEndian, uint16(val))
	}

	if val <= math.MaxUint32 {
		err := binarySerializer.PutUint8(w, 0xfe)
		if err != nil {
			return err
		}
		return binarySerializer.PutUint32(w, littleEndian, uint32(val))
	}

	err := binarySerializer.PutUint8(w, 0xff)
	if err != nil {
		return err
	}
	return binarySerializer.PutUint64(w, littleEndian, val)
}

// VarIntSerializeSize returns the number of bytes it would take to serialize
// val as a variable length integer.
func VarIntSerializeSize(val uint64) int {
	// The value is small enough to be represented by itself, so it's
	// just 1 byte.
	if val < 0xfd {
		return 1
	}

	// Discriminant 1 byte plus 2 bytes for the uint16.
	if val <= math.MaxUint16 {
		return 3
	}

	// Discriminant 1 byte plus 4 bytes for the uint32.
	if val <= math.MaxUint32 {
		return 5
	}

	// Discriminant 1 byte plus 8 bytes for the uint64.
	return 9
}

// ReadVarBytes reads a variable length byte array.  A byte array is encoded
// as a varInt containing the length of the array followed by the bytes
// themselves.  An error is returned if the length is greater than the
// passed maxAllowed parameter which helps protect against memory exhaustion
// attacks and forced panics thorugh malformed messages.  The fieldName
// parameter is only used for the error message so it provides more context in
// the error.
func ReadVarBytes(r io.Reader, maxAllowed uint32,
	fieldName string) ([]byte, error) {

	count, err := ReadVarInt(r)
	if err != nil {
		return nil, err
	}

	b := make([]byte, count)
	_, err = io.ReadFull(r, b)
	if err != nil {
		return nil, err
	}
	return b, nil
}

// WriteVarBytes serializes a variable length byte array to w as a varInt
// containing the number of bytes, followed by the bytes themselves.
func WriteVarBytes(w io.Writer, bytes []byte) error {
	slen := uint64(len(bytes))
	err := WriteVarInt(w, slen)
	if err != nil {
		return err
	}

	_, err = w.Write(bytes)
	if err != nil {
		return err
	}
	return nil
}

// randomUint64 returns a cryptographically random uint64 value.  This
// unexported version takes a reader primarily to ensure the error paths
// can be properly tested by passing a fake reader in the tests.
func randomUint64(r io.Reader) (uint64, error) {
	rv, err := binarySerializer.Uint64(r, bigEndian)
	if err != nil {
		return 0, err
	}
	return rv, nil
}

// RandomUint64 returns a cryptographically random uint64 value.
func RandomUint64() (uint64, error) {
	return randomUint64(rand.Reader)
}