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// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2025 Weaviate B.V. All rights reserved.
//
// CONTACT: hello@weaviate.io
//
package byteops
import (
"crypto/rand"
"fmt"
"math/big"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const MaxUint32 = ^uint32(0)
func mustRandIntn(max int64) int {
randInt, err := rand.Int(rand.Reader, big.NewInt(max))
if err != nil {
panic(fmt.Sprintf("mustRandIntn error: %v", err))
}
return int(randInt.Int64())
}
// Create a buffer with space for several values and first write into it and then test that the values can be read again
func TestReadAnWrite(t *testing.T) {
valuesNumbers := []uint64{234, 78, 23, 66, 8, 9, 2, 346745, 1}
valuesByteArray := make([]byte, mustRandIntn(500))
rand.Read(valuesByteArray)
writeBuffer := make([]byte, 2*Uint64Len+2*Uint32Len+2*Uint16Len+len(valuesByteArray))
byteOpsWrite := NewReadWriter(writeBuffer)
byteOpsWrite.WriteUint64(valuesNumbers[0])
byteOpsWrite.WriteUint32(uint32(valuesNumbers[1]))
byteOpsWrite.WriteUint32(uint32(valuesNumbers[2]))
assert.Equal(t, byteOpsWrite.CopyBytesToBuffer(valuesByteArray), nil)
byteOpsWrite.WriteUint16(uint16(valuesNumbers[3]))
byteOpsWrite.WriteUint64(valuesNumbers[4])
byteOpsWrite.WriteUint16(uint16(valuesNumbers[5]))
byteOpsRead := NewReadWriter(writeBuffer)
require.Equal(t, byteOpsRead.ReadUint64(), valuesNumbers[0])
require.Equal(t, byteOpsRead.ReadUint32(), uint32(valuesNumbers[1]))
require.Equal(t, byteOpsRead.ReadUint32(), uint32(valuesNumbers[2]))
// we are going to do the next op twice (once with copying, once without)
// to be able to rewind the buffer, let's cache the current position
posBeforeByteArray := byteOpsRead.Position
returnBuf, err := byteOpsRead.CopyBytesFromBuffer(uint64(len(valuesByteArray)), nil)
assert.Equal(t, returnBuf, valuesByteArray)
assert.Equal(t, err, nil)
// rewind the buffer to where it was before the read
byteOpsRead.MoveBufferToAbsolutePosition(posBeforeByteArray)
subSlice := byteOpsRead.ReadBytesFromBuffer(uint64(len(valuesByteArray)))
assert.Equal(t, subSlice, valuesByteArray)
// now read again using the other method
require.Equal(t, byteOpsRead.ReadUint16(), uint16(valuesNumbers[3]))
require.Equal(t, byteOpsRead.ReadUint64(), valuesNumbers[4])
require.Equal(t, byteOpsRead.ReadUint16(), uint16(valuesNumbers[5]))
}
// create buffer that is larger than uint32 and write to the end and then try to reread it
func TestReadAnWriteLargeBuffer(t *testing.T) {
writeBuffer := make([]byte, uint64(MaxUint32)+4)
byteOpsWrite := NewReadWriter(writeBuffer)
byteOpsWrite.MoveBufferPositionForward(uint64(MaxUint32))
byteOpsWrite.WriteUint16(uint16(10))
byteOpsRead := NewReadWriter(writeBuffer)
byteOpsRead.MoveBufferPositionForward(uint64(MaxUint32))
require.Equal(t, byteOpsRead.ReadUint16(), uint16(10))
}
func TestWritingAndReadingBufferOfDynamicLength(t *testing.T) {
empty := []byte{}
t.Run("uint64 length indicator", func(t *testing.T) {
bufLen := uint64(mustRandIntn(1024))
buf := make([]byte, bufLen)
rand.Read(buf)
// uint64 length indicator + buffer + unrelated data at end of buffer
totalBuf := make([]byte, 8+bufLen+8+8)
bo := NewReadWriter(totalBuf)
// write
assert.NoError(t, bo.CopyBytesToBufferWithUint64LengthIndicator(buf))
assert.Equal(t, buf, totalBuf[8:8+bufLen])
bo.WriteUint64(17)
assert.NoError(t, bo.CopyBytesToBufferWithUint64LengthIndicator(empty))
// read
bo = NewReadWriter(totalBuf)
bufRead := bo.ReadBytesFromBufferWithUint64LengthIndicator()
assert.Len(t, bufRead, int(bufLen))
assert.Equal(t, buf, bufRead)
assert.Equal(t, uint64(17), bo.ReadUint64())
bufRead = bo.ReadBytesFromBufferWithUint64LengthIndicator()
assert.Len(t, bufRead, 0)
assert.NotNil(t, bufRead)
// discard
bo = NewReadWriter(totalBuf)
discarded := bo.DiscardBytesFromBufferWithUint64LengthIndicator()
assert.Equal(t, bufLen, discarded)
assert.Equal(t, uint64(17), bo.ReadUint64())
})
t.Run("uint32 length indicator", func(t *testing.T) {
bufLen := uint32(mustRandIntn(1024))
buf := make([]byte, bufLen)
rand.Read(buf)
// uint32 length indicator + buffer + unrelated data at end of buffer
totalBuf := make([]byte, 4+bufLen+4+4)
bo := NewReadWriter(totalBuf)
// write
assert.NoError(t, bo.CopyBytesToBufferWithUint32LengthIndicator(buf))
assert.Equal(t, buf, totalBuf[4:4+bufLen])
bo.WriteUint32(17)
assert.NoError(t, bo.CopyBytesToBufferWithUint32LengthIndicator(empty))
// read
bo = NewReadWriter(totalBuf)
bufRead := bo.ReadBytesFromBufferWithUint32LengthIndicator()
assert.Len(t, bufRead, int(bufLen))
assert.Equal(t, buf, bufRead)
assert.Equal(t, uint32(17), bo.ReadUint32())
bufRead = bo.ReadBytesFromBufferWithUint32LengthIndicator()
assert.Len(t, bufRead, 0)
assert.NotNil(t, bufRead)
// discard
bo = NewReadWriter(totalBuf)
discarded := bo.DiscardBytesFromBufferWithUint32LengthIndicator()
assert.Equal(t, bufLen, discarded)
assert.Equal(t, uint32(17), bo.ReadUint32())
})
}
func TestIntsToByteVector(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
bytes := IntsToByteVector([]float64{})
assert.Equal(t, []byte{}, bytes)
})
t.Run("non-empty array of u8s", func(t *testing.T) {
bytes := IntsToByteVector([]float64{1, 2, 3})
assert.Equal(t, []byte{
0o1, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0,
0o2, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0,
0o3, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0,
}, bytes)
})
t.Run("non-empty array of u64", func(t *testing.T) {
bytes := IntsToByteVector([]float64{
9007199254740992, // MaxFloat64
9007199254740991,
9007199254740990,
})
assert.Equal(t, []byte{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x00,
0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x00,
}, bytes)
})
}
func TestIntsFromByteVector(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
ints := IntsFromByteVector([]byte{})
assert.Equal(t, []int64{}, ints)
})
t.Run("non-empty array of u8s", func(t *testing.T) {
ints := IntsFromByteVector([]byte{
0o1, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0,
0o2, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0,
0o3, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0, 0o0,
})
assert.Equal(t, []int64{1, 2, 3}, ints)
})
t.Run("non-empty array of u64", func(t *testing.T) {
ints := IntsFromByteVector([]byte{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x00,
0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1f, 0x00,
})
assert.Equal(t, []int64{
9007199254740992, // MaxFloat64
9007199254740991,
9007199254740990,
}, ints)
})
}
func TestFp32SliceToBytes(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
bytes := Fp32SliceToBytes([]float32{})
assert.Equal(t, []byte{}, bytes)
})
t.Run("non-empty array", func(t *testing.T) {
bytes := Fp32SliceToBytes([]float32{1.1, 2.2, 3.3})
assert.Equal(t, []byte{
0xcd, 0xcc, 0x8c, 0x3f,
0xcd, 0xcc, 0xc, 0x40,
0x33, 0x33, 0x53, 0x40,
}, bytes)
})
}
func TestFp32SliceOfSlicesToBytes(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
bytes := Fp32SliceOfSlicesToBytes([][]float32{})
assert.Equal(t, []byte{}, bytes)
})
t.Run("empty subarrays", func(t *testing.T) {
bytes := Fp32SliceOfSlicesToBytes([][]float32{{}, {}, {}})
assert.Equal(t, []byte{}, bytes)
})
t.Run("non-empty array", func(t *testing.T) {
bytes := Fp32SliceOfSlicesToBytes([][]float32{
{1.1, 2.2, 3.3},
{4.4, 5.5, 6.6},
{7.7, 8.8, 9.9},
})
assert.Equal(t, []byte{
0x3, 0x0,
0xcd, 0xcc, 0x8c, 0x3f, 0xcd, 0xcc, 0xc, 0x40, 0x33, 0x33, 0x53, 0x40,
0xcd, 0xcc, 0x8c, 0x40, 0x0, 0x0, 0xb0, 0x40, 0x33, 0x33, 0xd3, 0x40,
0x66, 0x66, 0xf6, 0x40, 0xcd, 0xcc, 0xc, 0x41, 0x66, 0x66, 0x1e, 0x41,
}, bytes)
})
}
func TestFp32SliceFromBytes(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
slice := Fp32SliceFromBytes([]byte{})
assert.Equal(t, []float32{}, slice)
})
t.Run("non-empty array", func(t *testing.T) {
slice := Fp32SliceFromBytes([]byte{
0xcd, 0xcc, 0x8c, 0x3f,
0xcd, 0xcc, 0xc, 0x40,
0x33, 0x33, 0x53, 0x40,
})
assert.Equal(t, []float32{1.1, 2.2, 3.3}, slice)
})
}
func TestFp32SliceOfSlicesFromBytes(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
slices, err := Fp32SliceOfSlicesFromBytes([]byte{})
assert.Nil(t, err)
assert.Equal(t, [][]float32{}, slices)
})
t.Run("dimension is 0", func(t *testing.T) {
_, err := Fp32SliceOfSlicesFromBytes([]byte{0x0, 0x0})
assert.NotNil(t, err)
assert.Equal(t, "dimension cannot be 0", err.Error())
})
t.Run("empty subarrays", func(t *testing.T) {
slices, err := Fp32SliceOfSlicesFromBytes([]byte{0x3, 0x0})
assert.Nil(t, err)
assert.Equal(t, [][]float32{}, slices)
})
t.Run("non-empty array", func(t *testing.T) {
slices, err := Fp32SliceOfSlicesFromBytes([]byte{
0x3, 0x0,
0xcd, 0xcc, 0x8c, 0x3f, 0xcd, 0xcc, 0xc, 0x40, 0x33, 0x33, 0x53, 0x40,
0xcd, 0xcc, 0x8c, 0x40, 0x0, 0x0, 0xb0, 0x40, 0x33, 0x33, 0xd3, 0x40,
0x66, 0x66, 0xf6, 0x40, 0xcd, 0xcc, 0xc, 0x41, 0x66, 0x66, 0x1e, 0x41,
})
assert.Nil(t, err)
assert.Equal(t, [][]float32{
{1.1, 2.2, 3.3},
{4.4, 5.5, 6.6},
{7.7, 8.8, 9.9},
}, slices)
})
}
func TestFp64SliceToBytes(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
bytes := Fp32SliceToBytes([]float32{})
assert.Equal(t, []byte{}, bytes)
})
t.Run("non-empty array", func(t *testing.T) {
bytes := Fp64SliceToBytes([]float64{1.1, 2.2, 3.3})
assert.Equal(t, []byte{
0x9a, 0x99, 0x99, 0x99, 0x99, 0x99, 0xf1, 0x3f,
0x9a, 0x99, 0x99, 0x99, 0x99, 0x99, 0x1, 0x40,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0xa, 0x40,
}, bytes)
})
}
func TestFp64SliceFromBytes(t *testing.T) {
t.Run("empty array", func(t *testing.T) {
slice := Fp64SliceFromBytes([]byte{})
assert.Equal(t, []float64{}, slice)
})
t.Run("non-empty array", func(t *testing.T) {
slice := Fp64SliceFromBytes([]byte{
0x9a, 0x99, 0x99, 0x99, 0x99, 0x99, 0xf1, 0x3f,
0x9a, 0x99, 0x99, 0x99, 0x99, 0x99, 0x1, 0x40,
0x66, 0x66, 0x66, 0x66, 0x66, 0x66, 0xa, 0x40,
})
assert.Equal(t, []float64{1.1, 2.2, 3.3}, slice)
})
}
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