mz700-tape-wav-gen/ascii_convert.go

package mz700_tape_wav_gen

import (
	"bytes"
)

func ASCII2MZ700(asciiStr string) []byte {
	sb := []byte(asciiStr)
	db := make([]byte, 0, len(sb))
	bb := bytes.NewBuffer(db)
	for _, b := range sb {
		if b >= 0x20 && b <= 0x7e {
			cvb := ASCII_TO_MZ700_TABLE[b]
			if cvb == 0 {
				bb.WriteByte(b)
			} else {
				bb.WriteByte(cvb)
			}
		}
	}
	return bb.Bytes()
}

func ConvertFilename(ascii string) []byte {
	cb := ASCII2MZ700(ascii)
	l := len(cb)
	if l > 16 {
		cb = cb[:16]
		l = 16
	}
	padl := 17 - l
	for i := 0; i < padl; i++ {
		cb = append(cb, 0x0D)
	}
	return cb
}

func ConvertStringCommnet(comment string) []byte {
	cb := ASCII2MZ700(comment)
	l := len(cb)
	if l > 103 {
		cb = cb[:103]
		l = 103
	}
	cb = append(cb, 0x0D)
	l++
	padl := 104 - l
	for i := 0; i < padl; i++ {
		cb = append(cb, 0x00)
	}
	return cb
}

func PaddingRawComment(cb []byte) []byte {
	l := len(cb)
	padl := 104 - l
	for i := 0; i < padl; i++ {
		cb = append(cb, 0x00)
	}
	return cb
}