/
builtins_hex.go
76 lines (62 loc) · 2.08 KB
/
builtins_hex.go
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package evaluator
import "github.com/Abathargh/harlock/internal/object"
const (
maxByte = (1 << 8) - 1
)
func hexBuiltinRecord(this object.Object, args ...object.Object) object.Object {
hexThis := this.(*object.HexFile)
idx := args[0].(*object.Integer)
readData, err := hexThis.File.Record(int(idx.Value))
if err != nil {
return newHexError("%s", err)
}
return &object.String{Value: readData.AsString()}
}
func hexBuiltinSize(this object.Object, _ ...object.Object) object.Object {
hexThis := this.(*object.HexFile)
size := hexThis.File.Size()
return &object.Integer{Value: int64(size)}
}
func hexBuiltinBinarySize(this object.Object, _ ...object.Object) object.Object {
hexThis := this.(*object.HexFile)
size := hexThis.File.BinarySize()
return &object.Integer{Value: int64(size)}
}
func hexBuiltinReadAt(this object.Object, args ...object.Object) object.Object {
hexThis := this.(*object.HexFile)
pos := args[0].(*object.Integer)
size := args[1].(*object.Integer)
if pos.Value < 0 || size.Value < 0 {
return newTypeError("position and size must be positive integers")
}
readData, err := hexThis.File.ReadAt(uint32(pos.Value), int(size.Value))
if err != nil {
return newHexError("%s", err)
}
retVal := &object.Array{Elements: make([]object.Object, len(readData))}
for idx, readByte := range readData {
retVal.Elements[idx] = &object.Integer{Value: int64(readByte)}
}
return retVal
}
func hexBuiltinWriteAt(this object.Object, args ...object.Object) object.Object {
hexThis := this.(*object.HexFile)
pos := args[0].(*object.Integer)
data := args[1].(*object.Array)
if pos.Value < 0 {
return newTypeError("address must be a positive integer")
}
byteArr := make([]byte, len(data.Elements))
for idx, elem := range data.Elements {
intElem, isInt := elem.(*object.Integer)
if !isInt || intElem.Value > maxByte || intElem.Value < 0 {
return newTypeError("data must be an array of 1 byte positive integers")
}
byteArr[idx] = byte(intElem.Value)
}
err := hexThis.File.WriteAt(uint32(pos.Value), byteArr)
if err != nil {
return newHexError("%s", err)
}
return nil
}