// Sets field value by name
func (dt *DbfTable) SetFieldValue(row int, fieldIndex int, value string) (err error) {
e := mahonia.NewEncoder(dt.fileEncoding)
b := []byte(e.ConvertString(value))
fieldLength := int(dt.fields[fieldIndex].fieldLength)
//DEBUG
//fmt.Printf("dt.numberOfBytesInHeader=%v\n\n", dt.numberOfBytesInHeader)
//fmt.Printf("dt.lengthOfEachRecord=%v\n\n", dt.lengthOfEachRecord)
// locate the offset of the field in DbfTable dataStore
offset := int(dt.numberOfBytesInHeader)
lengthOfRecord := int(dt.lengthOfEachRecord)
offset = offset + (row * lengthOfRecord)
recordOffset := 1
for i := 0; i < len(dt.fields); i++ {
if i == fieldIndex {
break
} else {
recordOffset += int(dt.fields[i].fieldLength)
}
}
// first fill the field with space values
for i := 0; i < fieldLength; i++ {
dt.dataStore[offset+recordOffset+i] = 0x20
}
// write new value
switch dt.fields[fieldIndex].fieldType {
case "C", "L", "D":
for i := 0; i < len(b) && i < fieldLength; i++ {
dt.dataStore[offset+recordOffset+i] = b[i]
}
case "N":
for i := 0; i < fieldLength; i++ {
// fmt.Printf("i:%v\n", i)
if i < len(b) {
dt.dataStore[offset+recordOffset+(fieldLength-i-1)] = b[(len(b)-1)-i]
} else {
break
}
}
}
return
//fmt.Printf("field value:%#v\n", []byte(value))
//fmt.Printf("field index:%#v\n", fieldIndex)
//fmt.Printf("field length:%v\n", dt.Fields[fieldIndex].fieldLength)
//fmt.Printf("string to byte:%#v\n", b)
}
/*
getByteSlice converts value to byte slice according to given encoding and return
a slice that is length equals to numberOfBytes or less if the string is shorter than
numberOfBytes
*/
func (dt *DbfTable) convertToByteSlice(value string, numberOfBytes int) (s []byte) {
e := mahonia.NewEncoder(dt.fileEncoding)
b := []byte(e.ConvertString(value))
if len(b) <= numberOfBytes {
s = b
} else {
s = b[0:numberOfBytes]
}
return
}
func (dt *DbfTable) getNormalizedFieldName(name string) (s string) {
e := mahonia.NewEncoder(dt.fileEncoding)
b := []byte(e.ConvertString(name))
if len(b) > 10 {
b = b[0:10]
}
d := mahonia.NewDecoder(dt.fileEncoding)
s = d.ConvertString(string(b))
return
}