43 lines
1.2 KiB
Java
43 lines
1.2 KiB
Java
package com.bytezone.diskbrowser.applefile;
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import com.bytezone.diskbrowser.HexFormatter;
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// only used by Prodos text files - note the fixed block size of 512 - bad!
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public class TextBuffer
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{
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public final byte[] buffer;
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public final int reclen;
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public final int firstRecNo;
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public TextBuffer (byte[] tempBuffer, int reclen, int firstBlock)
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{
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this.reclen = reclen;
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// calculate recNo of first full record
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int firstByte = firstBlock * 512; // logical byte #
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int rem = firstByte % reclen;
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firstRecNo = firstByte / reclen + (rem > 0 ? 1 : 0);
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int offset = (rem > 0) ? reclen - rem : 0;
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int availableBytes = tempBuffer.length - offset;
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int totalRecords = (availableBytes - 1) / reclen + 1;
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// should check whether the two buffers are identical, and maybe skip this
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// step
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buffer = new byte[totalRecords * reclen];
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int copyBytes = Math.min (availableBytes, buffer.length);
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System.arraycopy (tempBuffer, offset, buffer, 0, copyBytes);
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}
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@Override
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public String toString ()
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{
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StringBuilder text = new StringBuilder ();
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text.append ("Record length : " + reclen + "\n");
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text.append ("First record : " + firstRecNo + "\n\n");
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text.append (HexFormatter.format (buffer, 0, buffer.length) + "\n");
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return text.toString ();
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}
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} |