38 lines
801 B
Go
38 lines
801 B
Go
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package prodos
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import "os"
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func ReadVolumeBitmap(file *os.File) []byte {
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headerBlock := ReadBlock(file, 2)
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volumeHeader := parseVolumeHeader(headerBlock)
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bitmap := make([]byte, volumeHeader.TotalBlocks/8+1)
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totalBitmapBlocks := volumeHeader.TotalBlocks / 8 / 512
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for i := 0; i <= totalBitmapBlocks; i++ {
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bitmapBlock := ReadBlock(file, i+volumeHeader.BitmapStartBlock)
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for j := 0; j < 512; j++ {
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bitmap[i*512+j] = bitmapBlock[j]
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}
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}
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return bitmap
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}
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func WriteVolumeBitmap(file *os.File, bitmap []byte) {
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headerBlock := ReadBlock(file, 2)
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volumeHeader := parseVolumeHeader(headerBlock)
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for i := 0; i < len(bitmap)/512/8; i++ {
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WriteBlock(file, volumeHeader.BitmapStartBlock+1, bitmap[i*512:i*512+513])
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}
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}
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func FindFreeBlocks(numberOfBlocks int) []int {
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return nil
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}
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