Пример #1
0
// 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)

}
Пример #2
0
/*
	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
}
Пример #3
0
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
}