+++ /dev/null
-// Copyright ©2015 The Gonum Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package mat
-
-import (
- "encoding/binary"
- "errors"
- "io"
- "math"
-)
-
-const (
- // maxLen is the biggest slice/array len one can create on a 32/64b platform.
- maxLen = int64(int(^uint(0) >> 1))
-)
-
-var (
- sizeInt64 = binary.Size(int64(0))
- sizeFloat64 = binary.Size(float64(0))
-
- errTooBig = errors.New("mat: resulting data slice too big")
- errTooSmall = errors.New("mat: input slice too small")
- errBadBuffer = errors.New("mat: data buffer size mismatch")
- errBadSize = errors.New("mat: invalid dimension")
-)
-
-// MarshalBinary encodes the receiver into a binary form and returns the result.
-//
-// Dense is little-endian encoded as follows:
-// 0 - 7 number of rows (int64)
-// 8 - 15 number of columns (int64)
-// 16 - .. matrix data elements (float64)
-// [0,0] [0,1] ... [0,ncols-1]
-// [1,0] [1,1] ... [1,ncols-1]
-// ...
-// [nrows-1,0] ... [nrows-1,ncols-1]
-func (m Dense) MarshalBinary() ([]byte, error) {
- bufLen := int64(m.mat.Rows)*int64(m.mat.Cols)*int64(sizeFloat64) + 2*int64(sizeInt64)
- if bufLen <= 0 {
- // bufLen is too big and has wrapped around.
- return nil, errTooBig
- }
-
- p := 0
- buf := make([]byte, bufLen)
- binary.LittleEndian.PutUint64(buf[p:p+sizeInt64], uint64(m.mat.Rows))
- p += sizeInt64
- binary.LittleEndian.PutUint64(buf[p:p+sizeInt64], uint64(m.mat.Cols))
- p += sizeInt64
-
- r, c := m.Dims()
- for i := 0; i < r; i++ {
- for j := 0; j < c; j++ {
- binary.LittleEndian.PutUint64(buf[p:p+sizeFloat64], math.Float64bits(m.at(i, j)))
- p += sizeFloat64
- }
- }
-
- return buf, nil
-}
-
-// MarshalBinaryTo encodes the receiver into a binary form and writes it into w.
-// MarshalBinaryTo returns the number of bytes written into w and an error, if any.
-//
-// See MarshalBinary for the on-disk layout.
-func (m Dense) MarshalBinaryTo(w io.Writer) (int, error) {
- var n int
- var buf [8]byte
- binary.LittleEndian.PutUint64(buf[:], uint64(m.mat.Rows))
- nn, err := w.Write(buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- binary.LittleEndian.PutUint64(buf[:], uint64(m.mat.Cols))
- nn, err = w.Write(buf[:])
- n += nn
- if err != nil {
- return n, err
- }
-
- r, c := m.Dims()
- for i := 0; i < r; i++ {
- for j := 0; j < c; j++ {
- binary.LittleEndian.PutUint64(buf[:], math.Float64bits(m.at(i, j)))
- nn, err = w.Write(buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- }
- }
-
- return n, nil
-}
-
-// UnmarshalBinary decodes the binary form into the receiver.
-// It panics if the receiver is a non-zero Dense matrix.
-//
-// See MarshalBinary for the on-disk layout.
-//
-// Limited checks on the validity of the binary input are performed:
-// - matrix.ErrShape is returned if the number of rows or columns is negative,
-// - an error is returned if the resulting Dense matrix is too
-// big for the current architecture (e.g. a 16GB matrix written by a
-// 64b application and read back from a 32b application.)
-// UnmarshalBinary does not limit the size of the unmarshaled matrix, and so
-// it should not be used on untrusted data.
-func (m *Dense) UnmarshalBinary(data []byte) error {
- if !m.IsZero() {
- panic("mat: unmarshal into non-zero matrix")
- }
-
- if len(data) < 2*sizeInt64 {
- return errTooSmall
- }
-
- p := 0
- rows := int64(binary.LittleEndian.Uint64(data[p : p+sizeInt64]))
- p += sizeInt64
- cols := int64(binary.LittleEndian.Uint64(data[p : p+sizeInt64]))
- p += sizeInt64
- if rows < 0 || cols < 0 {
- return errBadSize
- }
-
- size := rows * cols
- if int(size) < 0 || size > maxLen {
- return errTooBig
- }
-
- if len(data) != int(size)*sizeFloat64+2*sizeInt64 {
- return errBadBuffer
- }
-
- m.reuseAs(int(rows), int(cols))
- for i := range m.mat.Data {
- m.mat.Data[i] = math.Float64frombits(binary.LittleEndian.Uint64(data[p : p+sizeFloat64]))
- p += sizeFloat64
- }
-
- return nil
-}
-
-// UnmarshalBinaryFrom decodes the binary form into the receiver and returns
-// the number of bytes read and an error if any.
-// It panics if the receiver is a non-zero Dense matrix.
-//
-// See MarshalBinary for the on-disk layout.
-//
-// Limited checks on the validity of the binary input are performed:
-// - matrix.ErrShape is returned if the number of rows or columns is negative,
-// - an error is returned if the resulting Dense matrix is too
-// big for the current architecture (e.g. a 16GB matrix written by a
-// 64b application and read back from a 32b application.)
-// UnmarshalBinary does not limit the size of the unmarshaled matrix, and so
-// it should not be used on untrusted data.
-func (m *Dense) UnmarshalBinaryFrom(r io.Reader) (int, error) {
- if !m.IsZero() {
- panic("mat: unmarshal into non-zero matrix")
- }
-
- var (
- n int
- buf [8]byte
- )
- nn, err := readFull(r, buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- rows := int64(binary.LittleEndian.Uint64(buf[:]))
-
- nn, err = readFull(r, buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- cols := int64(binary.LittleEndian.Uint64(buf[:]))
- if rows < 0 || cols < 0 {
- return n, errBadSize
- }
-
- size := rows * cols
- if int(size) < 0 || size > maxLen {
- return n, errTooBig
- }
-
- m.reuseAs(int(rows), int(cols))
- for i := range m.mat.Data {
- nn, err = readFull(r, buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- m.mat.Data[i] = math.Float64frombits(binary.LittleEndian.Uint64(buf[:]))
- }
-
- return n, nil
-}
-
-// MarshalBinary encodes the receiver into a binary form and returns the result.
-//
-// VecDense is little-endian encoded as follows:
-// 0 - 7 number of elements (int64)
-// 8 - .. vector's data elements (float64)
-func (v VecDense) MarshalBinary() ([]byte, error) {
- bufLen := int64(sizeInt64) + int64(v.n)*int64(sizeFloat64)
- if bufLen <= 0 {
- // bufLen is too big and has wrapped around.
- return nil, errTooBig
- }
-
- p := 0
- buf := make([]byte, bufLen)
- binary.LittleEndian.PutUint64(buf[p:p+sizeInt64], uint64(v.n))
- p += sizeInt64
-
- for i := 0; i < v.n; i++ {
- binary.LittleEndian.PutUint64(buf[p:p+sizeFloat64], math.Float64bits(v.at(i)))
- p += sizeFloat64
- }
-
- return buf, nil
-}
-
-// MarshalBinaryTo encodes the receiver into a binary form, writes it to w and
-// returns the number of bytes written and an error if any.
-//
-// See MarshalBainry for the on-disk format.
-func (v VecDense) MarshalBinaryTo(w io.Writer) (int, error) {
- var (
- n int
- buf [8]byte
- )
-
- binary.LittleEndian.PutUint64(buf[:], uint64(v.n))
- nn, err := w.Write(buf[:])
- n += nn
- if err != nil {
- return n, err
- }
-
- for i := 0; i < v.n; i++ {
- binary.LittleEndian.PutUint64(buf[:], math.Float64bits(v.at(i)))
- nn, err = w.Write(buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- }
-
- return n, nil
-}
-
-// UnmarshalBinary decodes the binary form into the receiver.
-// It panics if the receiver is a non-zero VecDense.
-//
-// See MarshalBinary for the on-disk layout.
-//
-// Limited checks on the validity of the binary input are performed:
-// - matrix.ErrShape is returned if the number of rows is negative,
-// - an error is returned if the resulting VecDense is too
-// big for the current architecture (e.g. a 16GB vector written by a
-// 64b application and read back from a 32b application.)
-// UnmarshalBinary does not limit the size of the unmarshaled vector, and so
-// it should not be used on untrusted data.
-func (v *VecDense) UnmarshalBinary(data []byte) error {
- if !v.IsZero() {
- panic("mat: unmarshal into non-zero vector")
- }
-
- p := 0
- n := int64(binary.LittleEndian.Uint64(data[p : p+sizeInt64]))
- p += sizeInt64
- if n < 0 {
- return errBadSize
- }
- if n > maxLen {
- return errTooBig
- }
- if len(data) != int(n)*sizeFloat64+sizeInt64 {
- return errBadBuffer
- }
-
- v.reuseAs(int(n))
- for i := range v.mat.Data {
- v.mat.Data[i] = math.Float64frombits(binary.LittleEndian.Uint64(data[p : p+sizeFloat64]))
- p += sizeFloat64
- }
-
- return nil
-}
-
-// UnmarshalBinaryFrom decodes the binary form into the receiver, from the
-// io.Reader and returns the number of bytes read and an error if any.
-// It panics if the receiver is a non-zero VecDense.
-//
-// See MarshalBinary for the on-disk layout.
-// See UnmarshalBinary for the list of sanity checks performed on the input.
-func (v *VecDense) UnmarshalBinaryFrom(r io.Reader) (int, error) {
- if !v.IsZero() {
- panic("mat: unmarshal into non-zero vector")
- }
-
- var (
- n int
- buf [8]byte
- )
- nn, err := readFull(r, buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- sz := int64(binary.LittleEndian.Uint64(buf[:]))
- if sz < 0 {
- return n, errBadSize
- }
- if sz > maxLen {
- return n, errTooBig
- }
-
- v.reuseAs(int(sz))
- for i := range v.mat.Data {
- nn, err = readFull(r, buf[:])
- n += nn
- if err != nil {
- return n, err
- }
- v.mat.Data[i] = math.Float64frombits(binary.LittleEndian.Uint64(buf[:]))
- }
-
- if n != sizeInt64+int(sz)*sizeFloat64 {
- return n, io.ErrUnexpectedEOF
- }
-
- return n, nil
-}
-
-// readFull reads from r into buf until it has read len(buf).
-// It returns the number of bytes copied and an error if fewer bytes were read.
-// If an EOF happens after reading fewer than len(buf) bytes, io.ErrUnexpectedEOF is returned.
-func readFull(r io.Reader, buf []byte) (int, error) {
- var n int
- var err error
- for n < len(buf) && err == nil {
- var nn int
- nn, err = r.Read(buf[n:])
- n += nn
- }
- if n == len(buf) {
- return n, nil
- }
- if err == io.EOF {
- return n, io.ErrUnexpectedEOF
- }
- return n, err
-}
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