Apple-2-Tools/ShrinkItArchive
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Fix up SDK operations - when they're packed inside a BXY wrapper.

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This commit is contained in:
2012-06-27 04:09:16 +00:00
parent f5599334c5
commit 7743e29f8a
2 changed files with 36 additions and 4 deletions
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38
src/com/webcodepro/shrinkit/MasterHeaderBlock.java
View File

@ -25,12 +25,26 @@ public class MasterHeaderBlock {
private Date archiveModWhen;
private int masterVersion;
private long masterEof;
private byte[] nuFileId = {0,0,0,0,0,0};
/**
* Create the Master Header Block, based on the LittleEndianByteInputStream.
*/
public MasterHeaderBlock(LittleEndianByteInputStream bs) throws IOException {
bs.checkNuFileId();
int headerOffset = 0;
nuFileId = bs.readBytes(6);
if (checkId(nuFileId,BXY_ID)) {
bs.readBytes(127 - NUFILE_ID.length);
headerOffset = 128;
int count = bs.read();
if (count != 0)
throw new IOException("This is actually a Binary II archive with multiple files in it.");
nuFileId = bs.readBytes(6);
}
if (!checkId(nuFileId,NUFILE_ID)) {
throw new IOException("Unable to decode this archive.");
}
masterCrc = bs.readWord();
bs.resetCrc(); // CRC is computed from this point to the end of the header
totalRecords = bs.readLong();
@ -44,7 +58,7 @@ public class MasterHeaderBlock {
masterEof = -1;
}
// Read whatever remains of the fixed size header
while (bs.getTotalBytesRead() < MASTER_HEADER_LENGTH) {
while (bs.getTotalBytesRead() < MASTER_HEADER_LENGTH + headerOffset) {
bs.readByte();
}
validCrc = (masterCrc == bs.getCrcValue());
@ -91,4 +105,22 @@ public class MasterHeaderBlock {
public boolean isValidCrc() {
return validCrc;
}
/**
* Test that the requested constant is present.
*/
private boolean checkId(byte[] data, byte[] constant) {
for (int i = 0; i < constant.length; i++){
if (data[i] != constant[i])
return false;
}
return true;
}
/** Master Header Block identifier "magic" bytes. */
public static final byte[] NUFILE_ID = { 0x4e, (byte)0xf5, 0x46, (byte)0xe9, 0x6c, (byte)0xe5 };
/** Header Block identifier "magic" bytes. */
public static final byte[] NUFX_ID = { 0x4e, (byte)0xf5, 0x46, (byte)0xd8 };
/** Binay II identifier "magic" bytes. */
public static final byte[] BXY_ID = { 0x0a, 0x47, 0x4c };
}

2
src/com/webcodepro/shrinkit/ThreadRecord.java
View File

@ -53,7 +53,7 @@ public class ThreadRecord {
if (hb.getStorageType() <= 13 ) {
/* supposed to be block size, but SHK v3.0.1 stored it wrong */
threadEof = hb.getExtraType() * 512;
System.out.println("Found erroneous storage type... fixing.");
// System.out.println("Found erroneous storage type... fixing.");
} else if (hb.getStorageType() == 256 &&
hb.getExtraType() == 280 &&
hb.getFileSysId() == 2 ) { // FileSysDOS33