mirror of
https://github.com/tuneinsight/lattigo.git
synced 2025-09-13 03:27:14 +00:00
307 lines
6.7 KiB
Go
307 lines
6.7 KiB
Go
package buffer
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import (
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"encoding/binary"
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"fmt"
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"unsafe"
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"github.com/tuneinsight/lattigo/v4/utils"
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)
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// Read reads a slice of bytes from r and copies it on c.
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func Read(r Reader, c []byte) (n int64, err error) {
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slice, err := r.Peek(len(c))
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if err != nil {
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return int64(len(slice)), err
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}
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copy(c, slice)
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nint, err := r.Discard(len(c))
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return int64(nint), err
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}
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// ReadInt reads an int values from r and stores the result into *c.
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func ReadInt(r Reader, c *int) (n int64, err error) {
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if c == nil {
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return 0, fmt.Errorf("cannot ReadInt: c is nil")
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}
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nint, err := ReadUint64(r, utils.PointyIntToPointUint64(c))
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return int64(nint), err
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}
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// ReadUint8 reads a byte from r and stores the result into *c.
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func ReadUint8(r Reader, c *uint8) (n int64, err error) {
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if c == nil {
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return 0, fmt.Errorf("cannot ReadUint8: c is nil")
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}
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slice, err := r.Peek(1)
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if err != nil {
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return int64(len(slice)), err
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}
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// Reads one byte
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*c = uint8(slice[0])
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nint, err := r.Discard(1)
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return int64(nint), err
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}
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// ReadUint8Slice reads a slice of byte from r and stores the result into c.
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func ReadUint8Slice(r Reader, c []uint8) (n int64, err error) {
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nint, err := r.Read(c)
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return int64(nint), err
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}
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// ReadUint16 reads a uint16 from r and stores the result into *c.
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func ReadUint16(r Reader, c *uint16) (n int64, err error) {
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if c == nil {
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return 0, fmt.Errorf("cannot ReadUint16: c is nil")
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}
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slice, err := r.Peek(2)
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if err != nil {
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return int64(len(slice)), err
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}
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// Reads one byte
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*c = binary.LittleEndian.Uint16(slice)
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nint, err := r.Discard(2)
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return int64(nint), err
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}
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// ReadUint16Slice reads a slice of uint16 from r and stores the result into c.
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func ReadUint16Slice(r Reader, c []uint16) (n int64, err error) {
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// c is empty, return
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if len(c) == 0 {
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return
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}
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var slice []byte
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size := r.Size()
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if len(c)<<1 < size {
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size = len(c) << 1
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}
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// Then returns the writen bytes
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if slice, err = r.Peek(size); err != nil {
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return int64(len(slice)), err
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}
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buffered := len(slice) >> 1
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// If the slice to write on is equal or smaller than the amount peaked
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if N := len(c); N <= buffered {
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for i, j := 0, 0; i < N; i, j = i+1, j+2 {
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c[i] = binary.LittleEndian.Uint16(slice[j:])
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}
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nint, err := r.Discard(N << 1) // Discards what was read
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return int64(nint), err
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}
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// Decodes the maximum
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for i, j := 0, 0; i < buffered; i, j = i+1, j+2 {
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c[i] = binary.LittleEndian.Uint16(slice[j:])
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}
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// Discard what was peeked
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var inc int
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if inc, err = r.Discard(len(slice)); err != nil {
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return n + int64(inc), err
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}
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n += int64(inc)
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// Recurses on the remaining slice to fill
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var inc64 int64
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inc64, err = ReadUint16Slice(r, c[buffered:])
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return n + inc64, err
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}
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// ReadUint32 reads a uint32 from r and stores the result into *c.
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func ReadUint32(r Reader, c *uint32) (n int64, err error) {
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if c == nil {
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return 0, fmt.Errorf("cannot ReadUint32: c is nil")
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}
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slice, err := r.Peek(4)
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if err != nil {
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return int64(len(slice)), err
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}
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// Reads one byte
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*c = binary.LittleEndian.Uint32(slice)
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nint, err := r.Discard(4)
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return int64(nint), err
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}
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// ReadUint32Slice reads a slice of uint32 from r and stores the result into c.
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func ReadUint32Slice(r Reader, c []uint32) (n int64, err error) {
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// c is empty, return
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if len(c) == 0 {
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return
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}
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var slice []byte
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// Avoid EOF
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size := r.Size()
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if len(c)<<2 < size {
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size = len(c) << 2
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}
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// Then returns the writen bytes
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if slice, err = r.Peek(size); err != nil {
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return int64(len(slice)), err
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}
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buffered := len(slice) >> 2
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// If the slice to write on is equal or smaller than the amount peaked
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if N := len(c); N <= buffered {
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for i, j := 0, 0; i < N; i, j = i+1, j+4 {
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c[i] = binary.LittleEndian.Uint32(slice[j:])
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}
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nint, err := r.Discard(N << 2) // Discards what was read
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return int64(nint), err
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}
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// Decodes the maximum
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for i, j := 0, 0; i < buffered; i, j = i+1, j+4 {
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c[i] = binary.LittleEndian.Uint32(slice[j:])
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}
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// Discard what was peeked
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var inc int
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if inc, err = r.Discard(len(slice)); err != nil {
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return n + int64(inc), err
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}
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n += int64(inc)
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// Recurses on the remaining slice to fill
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var inc64 int64
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inc64, err = ReadUint32Slice(r, c[buffered:])
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return n + inc64, err
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}
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// ReadUint64 reads a uint64 from r and stores the result into c.
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func ReadUint64(r Reader, c *uint64) (n int64, err error) {
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if c == nil {
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return 0, fmt.Errorf("cannot ReadUint64: c is nil")
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}
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bytes, err := r.Peek(8)
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if err != nil {
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return int64(len(bytes)), err
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}
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// Reads one byte
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*c = binary.LittleEndian.Uint64(bytes)
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nint, err := r.Discard(8)
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return int64(nint), err
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}
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// ReadUint64Slice reads a slice of uint64 from r and stores the result into c.
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func ReadUint64Slice(r Reader, c []uint64) (n int64, err error) {
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// c is empty, return
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if len(c) == 0 {
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return
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}
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var slice []byte
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// Avoid EOF
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size := r.Size()
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if len(c)<<3 < size {
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size = len(c) << 3
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}
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// Then returns the writen bytes
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if slice, err = r.Peek(size); err != nil {
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return int64(len(slice)), err
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}
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buffered := len(slice) >> 3
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// If the slice to write on is equal or smaller than the amount peaked
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if N := len(c); N <= buffered {
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for i, j := 0, 0; i < N; i, j = i+1, j+8 {
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c[i] = binary.LittleEndian.Uint64(slice[j:])
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}
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nint, err := r.Discard(N << 3) // Discards what was read
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return int64(nint), err
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}
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// Decodes the maximum
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for i, j := 0, 0; i < buffered; i, j = i+1, j+8 {
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c[i] = binary.LittleEndian.Uint64(slice[j:])
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}
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// Discard what was peeked
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var inc int
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if inc, err = r.Discard(len(slice)); err != nil {
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return n + int64(inc), err
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}
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n += int64(inc)
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// Recurses on the remaining slice to fill
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var inc64 int64
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inc64, err = ReadUint64Slice(r, c[buffered:])
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return n + inc64, err
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}
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// ReadFloat32 reads a float64 from r and stores the result into c.
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func ReadFloat32(r Reader, c *float32) (n int64, err error) {
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/* #nosec G103 -- behavior and consequences well understood */
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return ReadUint32(r, (*uint32)(unsafe.Pointer(c)))
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}
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// ReadFloat32Slice reads a slice of float32 from r and stores the result into c.
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func ReadFloat32Slice(r Reader, c []float32) (n int64, err error) {
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/* #nosec G103 -- behavior and consequences well understood */
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return ReadUint32Slice(r, *(*[]uint32)(unsafe.Pointer(&c)))
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}
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// ReadFloat64 reads a float64 from r and stores the result into c.
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func ReadFloat64(r Reader, c *float64) (n int64, err error) {
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/* #nosec G103 -- behavior and consequences well understood */
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return ReadUint64(r, (*uint64)(unsafe.Pointer(c)))
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}
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// ReadFloat64Slice reads a slice of float64 from r and stores the result into c.
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func ReadFloat64Slice(r Reader, c []float64) (n int64, err error) {
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/* #nosec G103 -- behavior and consequences well understood */
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return ReadUint64Slice(r, *(*[]uint64)(unsafe.Pointer(&c)))
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}
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