forked from batchatco/go-native-netcdf
/
fixedPoint.go
263 lines (250 loc) · 6.89 KB
/
fixedPoint.go
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package hdf5
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"math"
"reflect"
"github.com/batchatco/go-thrower"
)
type fixedPointManagerType struct{}
var (
fixedPointManager = fixedPointManagerType{}
_ typeManager = fixedPointManager
)
func (fixedPointManagerType) cdlTypeString(sh sigHelper, name string, attr *attribute, origNames map[string]bool) string {
prefix := ""
if !attr.signed {
prefix = "u"
}
switch attr.length {
case 1:
return prefix + "byte"
case 2:
return prefix + "short"
case 4:
return prefix + "int"
case 8:
return prefix + "int64"
default:
panic("bad int length")
}
}
func (fixedPointManagerType) goTypeString(sh sigHelper, name string, attr *attribute, origNames map[string]bool) string {
prefix := ""
if !attr.signed {
prefix = "u"
}
switch attr.length {
case 1:
return prefix + "int8"
case 2:
return prefix + "int16"
case 4:
return prefix + "int32"
case 8:
return prefix + "int64"
default:
panic("bad int length")
}
}
func (fixedPointManagerType) alloc(hr heapReader, c caster, bf io.Reader, attr *attribute,
dimensions []uint64) interface{} {
var values interface{}
switch attr.length {
case 1:
values = allocInt8s(bf, dimensions, attr.signed, nil)
case 2:
values = allocShorts(bf, dimensions, attr.endian, attr.signed, nil)
case 4:
values = allocInts(bf, dimensions, attr.endian, attr.signed, nil)
case 8:
values = allocInt64s(bf, dimensions, attr.endian, attr.signed, nil)
default:
fail(fmt.Sprintf("bad size fixed: %d (%v)", attr.length, attr))
}
return values // already converted
}
func (fixedPointManagerType) defaultFillValue(obj *object, objFillValue []byte, undefinedFillValue bool) []byte {
switch obj.objAttr.length {
case 1:
if undefinedFillValue {
fv := math.MinInt8 + 1
objFillValue = []byte{byte(fv)}
}
case 2:
if undefinedFillValue {
fv := int16(math.MinInt16 + 1)
var bb bytes.Buffer
err := binary.Write(&bb, obj.objAttr.endian, fv)
thrower.ThrowIfError(err)
objFillValue = bb.Bytes()
}
case 4:
if undefinedFillValue {
fv := int32(math.MinInt32 + 1)
var bb bytes.Buffer
err := binary.Write(&bb, obj.objAttr.endian, fv)
thrower.ThrowIfError(err)
objFillValue = bb.Bytes()
}
case 8:
if undefinedFillValue {
fv := int64(math.MinInt64 + 1)
var bb bytes.Buffer
err := binary.Write(&bb, obj.objAttr.endian, fv)
thrower.ThrowIfError(err)
objFillValue = bb.Bytes()
}
}
return objFillValue
}
func (fixedPointManagerType) parse(hr heapReader, c caster, attr *attribute, bitFields uint32, bf remReader, df remReader) {
logger.Info("* fixed-point")
// Same structure for all versions, no need to check
byteOrder := bitFields & 0b1
paddingType := (bitFields >> 1) & 0b11
signed := (bitFields >> 3) & 0b1
attr.signed = signed == 0b1
logger.Infof("byteOrder=%d paddingType=%d, signed=%d", byteOrder, paddingType, signed)
if byteOrder != 0 {
attr.endian = binary.BigEndian
} else {
attr.endian = binary.LittleEndian
}
assertError(paddingType == 0, ErrFixedPoint,
fmt.Sprintf("fixed point padding must be zero 0x%x", bitFields))
logger.Info("len properties", bf.Rem())
assert(bf.Rem() > 0, "properties should be here")
bitOffset := read16(bf)
bitPrecision := read16(bf)
logger.Infof("bitOffset=%d bitPrecision=%d blen=%d", bitOffset, bitPrecision,
bf.Count())
assertError(bitOffset == 0, ErrFixedPoint, "bit offset must be zero")
switch attr.length {
case 1, 2, 4, 8:
break
default:
thrower.Throw(ErrFixedPoint)
}
if df == nil {
logger.Infof("no data")
return
}
if df.Rem() >= int64(attr.length) {
attr.df = newResetReaderSave(df, df.Rem())
}
}
func allocInt8s(bf io.Reader, dimLengths []uint64, signed bool, cast reflect.Type) interface{} {
if cast == nil {
if signed {
cast = reflect.TypeOf(int8(0))
} else {
cast = reflect.TypeOf(uint8(0))
}
}
if len(dimLengths) == 0 {
value := read8(bf)
return reflect.ValueOf(value).Convert(cast).Interface()
}
thisDim := dimLengths[0]
if len(dimLengths) == 1 {
values := reflect.MakeSlice(reflect.SliceOf(cast), int(thisDim), int(thisDim)).Interface()
err := binary.Read(bf, binary.LittleEndian, values)
thrower.ThrowIfError(err)
return values
}
vals := makeSlices(cast, dimLengths)
for i := uint64(0); i < thisDim; i++ {
vals.Index(int(i)).Set(reflect.ValueOf(allocInt8s(bf, dimLengths[1:], signed, cast)))
}
return vals.Interface()
}
func allocShorts(bf io.Reader, dimLengths []uint64, endian binary.ByteOrder, signed bool,
cast reflect.Type) interface{} {
if cast == nil {
if signed {
cast = reflect.TypeOf(int16(0))
} else {
cast = reflect.TypeOf(uint16(0))
}
}
if len(dimLengths) == 0 {
var value uint16
err := binary.Read(bf, endian, &value)
thrower.ThrowIfError(err)
return reflect.ValueOf(value).Convert(cast).Interface()
}
thisDim := dimLengths[0]
if len(dimLengths) == 1 {
values := reflect.MakeSlice(reflect.SliceOf(cast), int(thisDim), int(thisDim)).Interface()
err := binary.Read(bf, endian, values)
thrower.ThrowIfError(err)
return values
}
vals := makeSlices(cast, dimLengths)
for i := uint64(0); i < thisDim; i++ {
vals.Index(int(i)).Set(reflect.ValueOf(allocShorts(bf, dimLengths[1:], endian, signed,
cast)))
}
return vals.Interface()
}
func allocInts(bf io.Reader, dimLengths []uint64, endian binary.ByteOrder, signed bool,
cast reflect.Type) interface{} {
if cast == nil {
if signed {
cast = reflect.TypeOf(int32(0))
} else {
cast = reflect.TypeOf(uint32(0))
}
}
if len(dimLengths) == 0 {
var value uint32
err := binary.Read(bf, endian, &value)
thrower.ThrowIfError(err)
return reflect.ValueOf(value).Convert(cast).Interface()
}
thisDim := dimLengths[0]
if len(dimLengths) == 1 {
values := reflect.MakeSlice(reflect.SliceOf(cast), int(thisDim), int(thisDim)).Interface()
err := binary.Read(bf, endian, values)
thrower.ThrowIfError(err)
return values
}
vals := makeSlices(cast, dimLengths)
for i := uint64(0); i < thisDim; i++ {
vals.Index(int(i)).Set(reflect.ValueOf(allocInts(bf, dimLengths[1:], endian, signed,
cast)))
}
return vals.Interface()
}
func allocInt64s(bf io.Reader, dimLengths []uint64, endian binary.ByteOrder, signed bool,
cast reflect.Type) interface{} {
if cast == nil {
if signed {
cast = reflect.TypeOf(int64(0))
} else {
cast = reflect.TypeOf(uint64(0))
}
}
if len(dimLengths) == 0 {
var value uint64
err := binary.Read(bf, endian, &value)
thrower.ThrowIfError(err)
return reflect.ValueOf(value).Convert(cast).Interface()
}
thisDim := dimLengths[0]
if len(dimLengths) == 1 {
values := reflect.MakeSlice(reflect.SliceOf(cast), int(thisDim), int(thisDim)).Interface()
err := binary.Read(bf, endian, values)
thrower.ThrowIfError(err)
return values
}
vals := makeSlices(cast, dimLengths)
for i := uint64(0); i < thisDim; i++ {
vals.Index(int(i)).Set(reflect.ValueOf(allocInt64s(bf, dimLengths[1:], endian, signed,
cast)))
}
return vals.Interface()
}