mirror of
https://github.com/fadden/ciderpress.git
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767 lines
21 KiB
C++
767 lines
21 KiB
C++
/*
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* CiderPress
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* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
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* See the file LICENSE for distribution terms.
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*/
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/*
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* Pack DDD.
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The trouble with unpacking DOS DDD 2.x files:
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The files are stored as binary files with no length. DDD v2.0 stored
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a copy of the length in sectors in the filename (e.g. "<397>"). This
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means that, when CiderPress goes to extract or view the file, it just
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sees an empty binary file.
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CiderPress could make an exception and assume that any binary file with
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zero length and more than one sector allocated has a length equal to the
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number of sectors times 256. This could cause problems for other things,
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but it's probably pretty safe. However, we still don't have an accurate
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idea of where the end of the file is.
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Knowing where the file ends is important because there is no identifying
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information or checksum in a DDD file. The only way to know that it's a
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DDD compressed disk is to try to unpack it and see if you end up at exactly
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140K at the same time that you run out of input. Without knowing where the
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file really ends, this test is much less certain.
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The only safe way to make this work would be to skip the automatic format
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detection and tell CiderPress that the file is definitely DDD format.
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There's currently no easy way to do that without complicating the user
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interface. Filename extensions might be useful, but they're rare under
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DOS 3.3, and I don't think the "<397>" convention is common to all versions
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of DDD.
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Complicating the matter is that, if a DOS DDD file (type 'B') is converted
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to ProDOS, the first 4 bytes will be stripped off. Without unpacking
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the file and knowing to within a byte where it ends, there's no way to
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automatically tell whether to start at byte 0 or byte 4. (DDD Pro files
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have four bytes of garbage at the very start, probably in an attempt to
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retain compatibility with the DOS version. Because it uses REL files the
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4 bytes of extra DOS stuff aren't added when the files are copied around,
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so this was a reasonably smart thing to do, but it complicates matters
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for CiderPress because a file extracted from DOS and a file extracted
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from ProDOS will come out differently due to the 4 bytes of type 'B'
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gunk getting stripped. This can be avoided if the DOS file uses the 'R'
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or 'S' file type.)
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All this would have been much easier if the DOS files had a length word.
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To unpack a file created by DOS DDD v2.x:
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- Copy the file to a ProDOS disk, using something that guesses at the
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actual length when one isn't provided (Copy ][+ 9.0 may work).
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- Reduce the length to within a byte or two of the actual end of file.
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Removing all but the last couple of trailing zero bytes usually does
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the trick.
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- Insert 4 bytes of garbage at the front of the file. My copy of DDD
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Pro 1.1 seems to like 03 c9 bf d0.
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Probably not worth the effort.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <assert.h>
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#include "../diskimg/DiskImg.h"
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#include "../nufxlib/NufxLib.h"
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using namespace DiskImgLib;
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#define nil NULL
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#define NELEM(x) (sizeof(x) / sizeof((x)[0]))
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FILE* gLog = nil;
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pid_t gPid = getpid();
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const int kTrackLen = 4096;
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const int kNumSymbols = 256;
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const int kNumFavorites = 20;
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const int kRLEDelim = 0x97; // value MUST have high bit set
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const int kNumTracks = 35;
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/* I suspect this is random garbage, but it's consistent for me */
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const unsigned long kDDDProSignature = 0xd0bfc903;
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/*
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* Class for getting and putting bits to and from a file.
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*/
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class BitBuffer {
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public:
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BitBuffer(void) : fFp(nil), fBits(0), fBitCount(0) {}
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~BitBuffer(void) {}
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void SetFile(FILE* fp) { fFp = fp; }
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void PutBits(unsigned char bits, int numBits);
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//void FlushBits(void);
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unsigned char GetBits(int numBits);
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static unsigned char Reverse(unsigned char val);
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private:
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FILE* fFp;
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unsigned char fBits;
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int fBitCount;
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};
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/*
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* Add bits to the buffer.
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*
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* We roll the low bits out of "bits" and shift them to the left (in the
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* reverse order in which they were passed in). As soon as we get 8 bits
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* we flush.
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*/
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void
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BitBuffer::PutBits(unsigned char bits, int numBits)
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{
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assert(fBitCount >= 0 && fBitCount < 8);
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assert(numBits > 0 && numBits <= 8);
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assert(fFp != nil);
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while (numBits--) {
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fBits = (fBits << 1) | (bits & 0x01);
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fBitCount++;
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if (fBitCount == 8) {
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putc(fBits, fFp);
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fBitCount = 0;
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}
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bits >>= 1;
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}
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}
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/*
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* Get bits from the buffer.
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*
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* These come out in the order in which they appear in the file, which
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* means that in some cases they will have to be reversed.
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*/
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unsigned char
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BitBuffer::GetBits(int numBits)
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{
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assert(fBitCount >= 0 && fBitCount < 8);
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assert(numBits > 0 && numBits <= 8);
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assert(fFp != nil);
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unsigned char retVal;
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if (fBitCount == 0) {
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/* have no bits */
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fBits = getc(fFp);
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fBitCount = 8;
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}
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if (numBits <= fBitCount) {
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/* just serve up what we've already got */
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retVal = fBits >> (8 - numBits);
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fBits <<= numBits;
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fBitCount -= numBits;
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} else {
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/* some old, some new; load what we have right-aligned */
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retVal = fBits >> (8 - fBitCount);
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numBits -= fBitCount;
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fBits = getc(fFp);
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fBitCount = 8;
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/* make room for the rest (also zeroes out the low bits) */
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retVal <<= numBits;
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/* add the high bits from the new byte */
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retVal |= fBits >> (8 - numBits);
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fBits <<= numBits;
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fBitCount -= numBits;
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}
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return retVal;
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}
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/*
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* Utility function to reverse the order of bits in a byte.
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*/
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/*static*/ unsigned char
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BitBuffer::Reverse(unsigned char val)
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{
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int i;
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unsigned char result = 0; // init to make compiler happy
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for (i = 0; i < 8; i++) {
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result = (result << 1) + (val & 0x01);
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val >>= 1;
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}
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return result;
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}
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#if 0
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/*
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* Flush any remaining bits out. Call this at the very end.
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*/
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void
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BitBuffer::FlushBits(void)
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{
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if (fBitCount) {
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fBits <<= 8 - fBitCount;
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putc(fBits, fFp);
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fBitCount = 0;
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}
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}
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#endif
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/*
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* Compute the #of times each byte appears in trackBuf. Runs of four
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* bytes or longer are completely ignored.
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*
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* "trackBuf" holds kTrackLen bytes of data, and "freqCounts" holds
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* kNumSymbols (256) unsigned shorts.
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*/
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void
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ComputeFreqCounts(const unsigned char* trackBuf, unsigned short* freqCounts)
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{
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const unsigned char* ucp;
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int i;
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memset(freqCounts, 0, 256 * sizeof(unsigned short));
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ucp = trackBuf;
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for (i = 0; i < kTrackLen; i++, ucp++) {
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if (i < (kTrackLen-3) &&
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*ucp == *(ucp+1) &&
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*ucp == *(ucp+2) &&
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*ucp == *(ucp+3))
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{
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int runLen = 4; // DEBUG only
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i += 3;
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ucp += 3;
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while (*ucp == *(ucp+1) && i < kTrackLen) {
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runLen++;
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ucp++;
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i++;
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if (runLen == 256) {
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runLen = 0;
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break;
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}
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}
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//printf("Found run of %d of 0x%02x\n", runLen, *ucp);
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} else {
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/* not a run, just update stats */
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freqCounts[*ucp]++;
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}
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}
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}
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/*
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* Find the 20 most frequently occurring symbols, in order.
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*
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* Modifies "freqCounts".
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*/
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void
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ComputeFavorites(unsigned short* freqCounts, unsigned char* favorites)
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{
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int i, fav;
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for (fav = 0; fav < kNumFavorites; fav++) {
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unsigned short bestCount = 0;
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unsigned char bestSym = 0;
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for (i = 0; i < kNumSymbols; i++) {
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if (freqCounts[i] >= bestCount) {
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bestSym = (unsigned char) i;
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bestCount = freqCounts[i];
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}
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}
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favorites[fav] = bestSym;
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freqCounts[bestSym] = 0;
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}
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//printf("FAVORITES: ");
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//for (fav = 0; fav < kNumFavorites; fav++)
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// printf("%02x ", favorites[fav]);
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//printf("\n");
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}
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/*
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* These are all odd, which when they're written in reverse order means
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* they all have their hi bits set.
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*/
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static const unsigned char kFavoriteBitEnc[kNumFavorites] = {
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0x03, 0x09, 0x1f, 0x0f, 0x07, 0x1b, 0x0b, 0x0d, 0x15, 0x37,
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0x3d, 0x25, 0x05, 0xb1, 0x11, 0x21, 0x01, 0x57, 0x5d, 0x1d
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};
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static const int kFavoriteBitEncLen[kNumFavorites] = {
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4, 4, 5, 5, 5, 5, 5, 5, 5, 6,
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6, 6, 6, 6, 6, 6, 6, 7, 7, 7
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};
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/*
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* Compress a track full of data.
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*/
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void
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CompressTrack(const unsigned char* trackBuf, BitBuffer* pBitBuf)
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{
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unsigned short freqCounts[kNumSymbols];
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unsigned char favorites[kNumFavorites];
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int i, fav;
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ComputeFreqCounts(trackBuf, freqCounts);
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ComputeFavorites(freqCounts, favorites);
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/* write favorites */
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for (fav = 0; fav < kNumFavorites; fav++)
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pBitBuf->PutBits(favorites[fav], 8);
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/*
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* Compress track data. Store runs as { 0x97 char count }, where
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* a count of zero means 256.
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*/
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const unsigned char* ucp = trackBuf;
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for (i = 0; i < kTrackLen; i++, ucp++) {
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if (i < (kTrackLen-3) &&
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*ucp == *(ucp+1) &&
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*ucp == *(ucp+2) &&
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*ucp == *(ucp+3))
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{
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int runLen = 4;
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i += 3;
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ucp += 3;
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while (*ucp == *(ucp+1) && i < kTrackLen) {
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runLen++;
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ucp++;
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i++;
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if (runLen == 256) {
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runLen = 0;
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break;
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}
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}
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pBitBuf->PutBits(kRLEDelim, 8); // note kRLEDelim has hi bit set
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pBitBuf->PutBits(*ucp, 8);
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pBitBuf->PutBits(runLen, 8);
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} else {
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/*
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* Not a run, see if it's one of our favorites.
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*/
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for (fav = 0; fav < kNumFavorites; fav++) {
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if (*ucp == favorites[fav])
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break;
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}
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if (fav == kNumFavorites) {
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/* just a plain byte */
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pBitBuf->PutBits(0x00, 1);
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pBitBuf->PutBits(*ucp, 8);
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} else {
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/* found a favorite; leading hi bit is implied */
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pBitBuf->PutBits(kFavoriteBitEnc[fav], kFavoriteBitEncLen[fav]);
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}
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}
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}
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}
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/*
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* Handle a debug message from the DiskImg library.
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*/
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/*static*/ void
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MsgHandler(const char* file, int line, const char* msg)
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{
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assert(file != nil);
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assert(msg != nil);
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fprintf(gLog, "%05u %s", gPid, msg);
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}
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/*
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* Handle a global error message from the NufxLib library by shoving it
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* through the DiskImgLib message function.
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*/
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NuResult
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NufxErrorMsgHandler(NuArchive* /*pArchive*/, void* vErrorMessage)
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{
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const NuErrorMessage* pErrorMessage = (const NuErrorMessage*) vErrorMessage;
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if (pErrorMessage->isDebug) {
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Global::PrintDebugMsg(pErrorMessage->file, pErrorMessage->line,
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"<nufxlib> [D] %s\n", pErrorMessage->message);
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} else {
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Global::PrintDebugMsg(pErrorMessage->file, pErrorMessage->line,
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"<nufxlib> %s\n", pErrorMessage->message);
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}
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return kNuOK;
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}
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/*
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* Pack a disk image with DDD.
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*/
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DIError
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Pack(const char* infile, const char* outfile)
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{
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DIError dierr = kDIErrNone;
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DiskImg srcImg;
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FILE* outfp = nil;
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BitBuffer bitBuffer;
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printf("Packing in='%s' out='%s'\n", infile, outfile);
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/*
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* Prepare the source image.
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*/
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dierr = srcImg.OpenImage(infile, '/', true);
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if (dierr != kDIErrNone) {
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fprintf(stderr, "Unable to open disk image: %s.\n",
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DiskImgLib::DIStrError(dierr));
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goto bail;
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}
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dierr = srcImg.AnalyzeImage();
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if (dierr != kDIErrNone) {
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fprintf(stderr, "Unable to determine source image format.\n");
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goto bail;
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}
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if (!srcImg.GetHasSectors()) {
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fprintf(stderr, "Sorry, only sector-addressable images allowed.\n");
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dierr = kDIErrUnsupportedPhysicalFmt;
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goto bail;
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}
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assert(srcImg.GetNumSectPerTrack() > 0);
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if (srcImg.GetSectorOrder() == DiskImg::kSectorOrderUnknown) {
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fprintf(stderr, "(QUERY) don't know sector order\n");
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dierr = kDIErrFilesystemNotFound;
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goto bail;
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}
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/* force the access to be DOS-ordered */
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dierr = srcImg.OverrideFormat(srcImg.GetPhysicalFormat(),
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DiskImg::kFormatGenericDOSOrd, srcImg.GetSectorOrder());
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if (dierr != kDIErrNone) {
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fprintf(stderr, "Couldn't switch to generic ProDOS: %s.\n",
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DiskImgLib::DIStrError(dierr));
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goto bail;
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}
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/* transfer the DOS volume num, if one was set */
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printf("DOS volume number set to %d\n", srcImg.GetDOSVolumeNum());
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if (srcImg.GetDOSVolumeNum() == DiskImg::kVolumeNumNotSet)
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srcImg.SetDOSVolumeNum(kDefaultNibbleVolumeNum);
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/*
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* Open the output file.
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*/
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outfp = fopen(outfile, "w");
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if (outfp == nil) {
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perror("unable to open output file");
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dierr = kDIErrGeneric;
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goto bail;
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}
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/* write four zeroes to replace the DOS addr/len bytes */
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/* (let's write the apparent DDD Pro v1.1 signature instead) */
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putc(kDDDProSignature, outfp);
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putc(kDDDProSignature >> 8, outfp);
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putc(kDDDProSignature >> 16, outfp);
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putc(kDDDProSignature >> 24, outfp);
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bitBuffer.SetFile(outfp);
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bitBuffer.PutBits(0x00, 3);
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bitBuffer.PutBits(srcImg.GetDOSVolumeNum(), 8);
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/*
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* Process all tracks.
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*/
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for (int track = 0; track < srcImg.GetNumTracks(); track++) {
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unsigned char trackBuf[kTrackLen];
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/*
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* Read the track.
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*/
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for (int sector = 0; sector < srcImg.GetNumSectPerTrack(); sector++) {
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dierr = srcImg.ReadTrackSector(track, sector,
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trackBuf + sector * 256);
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if (dierr != kDIErrNone) {
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fprintf(stderr, "ERROR: ReadBlock failed (err=%d)\n", dierr);
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goto bail;
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}
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}
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//printf("Got track %d (0x%02x %02x %02x %02x %02x %02x ...)\n",
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// track, trackBuf[0], trackBuf[1], trackBuf[2], trackBuf[3],
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// trackBuf[4], trackBuf[5]);
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CompressTrack(trackBuf, &bitBuffer);
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}
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/* write 8 bits of zeroes to flush remaining data out of buffer */
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bitBuffer.PutBits(0x00, 8);
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/* write another zero byte because that's what DDD Pro v1.1 does */
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long zero;
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zero = 0;
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fwrite(&zero, 1, 1, outfp);
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dierr = srcImg.CloseImage();
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if (dierr != kDIErrNone) {
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fprintf(stderr, "ERROR: srcImg close failed?!\n");
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goto bail;
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}
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assert(dierr == kDIErrNone);
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bail:
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return dierr;
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}
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/*
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* This is the reverse of the kFavoriteBitEnc table. The bits are
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* reversed and lack the high bit.
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*/
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static const unsigned char kFavoriteBitDec[kNumFavorites] = {
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0x04, 0x01, 0x0f, 0x0e, 0x0c, 0x0b, 0x0a, 0x06, 0x05, 0x1b,
|
|
0x0f, 0x09, 0x08, 0x03, 0x02, 0x01, 0x00, 0x35, 0x1d, 0x1c
|
|
};
|
|
|
|
/*
|
|
* Unpack a single track.
|
|
*
|
|
* Returns "true" if all went well, "false" if something failed.
|
|
*/
|
|
bool
|
|
UnpackTrack(BitBuffer* pBitBuffer, unsigned char* trackBuf)
|
|
{
|
|
unsigned char favorites[kNumFavorites];
|
|
unsigned char val;
|
|
unsigned char* trackPtr;
|
|
int fav;
|
|
|
|
/*
|
|
* Start by pulling our favorites out, in reverse order.
|
|
*/
|
|
for (fav = 0; fav < kNumFavorites; fav++) {
|
|
val = pBitBuffer->GetBits(8);
|
|
val = pBitBuffer->Reverse(val);
|
|
favorites[fav] = val;
|
|
}
|
|
|
|
trackPtr = trackBuf;
|
|
|
|
/*
|
|
* Keep pulling data out until the track is full.
|
|
*/
|
|
while (trackPtr < trackBuf + kTrackLen) {
|
|
val = pBitBuffer->GetBits(1);
|
|
if (!val) {
|
|
/* simple byte */
|
|
val = pBitBuffer->GetBits(8);
|
|
val = pBitBuffer->Reverse(val);
|
|
*trackPtr++ = val;
|
|
} else {
|
|
/* try for a prefix match */
|
|
int extraBits;
|
|
|
|
val = pBitBuffer->GetBits(2);
|
|
|
|
for (extraBits = 0; extraBits < 4; extraBits++) {
|
|
val = (val << 1) | pBitBuffer->GetBits(1);
|
|
int start, end;
|
|
|
|
if (extraBits == 0) {
|
|
start = 0;
|
|
end = 2;
|
|
} else if (extraBits == 1) {
|
|
start = 2;
|
|
end = 9;
|
|
} else if (extraBits == 2) {
|
|
start = 9;
|
|
end = 17;
|
|
} else {
|
|
start = 17;
|
|
end = 20;
|
|
}
|
|
|
|
while (start < end) {
|
|
if (val == kFavoriteBitDec[start]) {
|
|
/* winner! */
|
|
*trackPtr++ = favorites[start];
|
|
break;
|
|
}
|
|
start++;
|
|
}
|
|
if (start != end)
|
|
break; // we got it, break out of for loop
|
|
}
|
|
if (extraBits == 4) {
|
|
/* we didn't get it, this must be RLE */
|
|
unsigned char rleChar;
|
|
int rleCount;
|
|
|
|
(void) pBitBuffer->GetBits(1); // get last bit of 0x97
|
|
val = pBitBuffer->GetBits(8);
|
|
rleChar = pBitBuffer->Reverse(val);
|
|
val = pBitBuffer->GetBits(8);
|
|
rleCount = pBitBuffer->Reverse(val);
|
|
printf("Found run of %d of 0x%02x\n", rleCount, rleChar);
|
|
|
|
if (rleCount == 0)
|
|
rleCount = 256;
|
|
|
|
/* make sure we won't overrun */
|
|
if (trackPtr + rleCount > trackBuf + kTrackLen) {
|
|
printf("Overrun in RLE\n");
|
|
return false;
|
|
}
|
|
while (rleCount--)
|
|
*trackPtr++ = rleChar;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Unpack a disk image compressed with DDD.
|
|
*
|
|
* The result is an unadorned DOS-ordered image.
|
|
*/
|
|
DIError
|
|
Unpack(const char* infile, const char* outfile)
|
|
{
|
|
DIError dierr = kDIErrNone;
|
|
FILE* infp = nil;
|
|
FILE* outfp = nil;
|
|
BitBuffer bitBuffer;
|
|
unsigned char val;
|
|
|
|
printf("Unpacking in='%s' out='%s'\n", infile, outfile);
|
|
|
|
/*
|
|
* Open the input file.
|
|
*/
|
|
infp = fopen(infile, "r");
|
|
if (infp == nil) {
|
|
perror("unable to open input file");
|
|
dierr = kDIErrGeneric;
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Open the output file.
|
|
*/
|
|
outfp = fopen(outfile, "w");
|
|
if (outfp == nil) {
|
|
perror("unable to open output file");
|
|
dierr = kDIErrGeneric;
|
|
goto bail;
|
|
}
|
|
|
|
/* read four zeroes to skip the DOS addr/len bytes */
|
|
(void) getc(infp);
|
|
(void) getc(infp);
|
|
(void) getc(infp);
|
|
(void) getc(infp);
|
|
|
|
bitBuffer.SetFile(infp);
|
|
|
|
val = bitBuffer.GetBits(3);
|
|
if (val != 0) {
|
|
printf("HEY: this isn't a DDD II file (%d)\n", val);
|
|
dierr = kDIErrGeneric;
|
|
goto bail;
|
|
}
|
|
val = bitBuffer.GetBits(8);
|
|
val = bitBuffer.Reverse(val);
|
|
printf("GOT disk volume num = %d\n", val);
|
|
|
|
for (int track = 0; track < kNumTracks; track++) {
|
|
unsigned char trackBuf[kTrackLen];
|
|
|
|
if (!UnpackTrack(&bitBuffer, trackBuf)) {
|
|
fprintf(stderr, "FAILED on track %d\n", track);
|
|
dierr = kDIErrBadCompressedData;
|
|
goto bail;
|
|
}
|
|
if (feof(infp) || ferror(infp)) {
|
|
fprintf(stderr, "Failure or EOF on input file\n");
|
|
dierr = kDIErrBadCompressedData;
|
|
goto bail;
|
|
}
|
|
fwrite(trackBuf, 1, 4096, outfp);
|
|
}
|
|
|
|
/*
|
|
* We should be within a byte or two of the end of the file.
|
|
*/
|
|
(void) getc(infp);
|
|
(void) getc(infp);
|
|
(void) getc(infp);
|
|
(void) getc(infp);
|
|
if (!feof(infp)) {
|
|
fprintf(stderr, "Looks like too much data in input file\n");
|
|
dierr = kDIErrBadCompressedData;
|
|
goto bail;
|
|
}
|
|
|
|
assert(dierr == kDIErrNone);
|
|
bail:
|
|
return dierr;
|
|
}
|
|
|
|
/*
|
|
* Process every argument.
|
|
*/
|
|
int
|
|
main(int argc, char** argv)
|
|
{
|
|
// const char* kLogFile = "iconv-log.txt";
|
|
|
|
if (argc != 3) {
|
|
fprintf(stderr, "%s: infile outfile\n", argv[0]);
|
|
exit(2);
|
|
}
|
|
|
|
gLog = stdout;
|
|
// gLog = fopen(kLogFile, "w");
|
|
// if (gLog == nil) {
|
|
// fprintf(stderr, "ERROR: unable to open log file\n");
|
|
// exit(1);
|
|
// }
|
|
|
|
printf("DDD Converter for Linux v1.0\n");
|
|
printf("Copyright (C) 2003 by faddenSoft, LLC. All rights reserved.\n");
|
|
int32_t major, minor, bug;
|
|
Global::GetVersion(&major, &minor, &bug);
|
|
printf("Linked against DiskImg library v%d.%d.%d\n",
|
|
major, minor, bug);
|
|
// printf("Log file is '%s'\n", kLogFile);
|
|
printf("\n");
|
|
|
|
Global::SetDebugMsgHandler(MsgHandler);
|
|
Global::AppInit();
|
|
|
|
NuSetGlobalErrorMessageHandler(NufxErrorMsgHandler);
|
|
|
|
int len = strlen(argv[2]);
|
|
if (len > 3 && strcasecmp(argv[2] + len - 3, ".do") == 0) {
|
|
Unpack(argv[1], argv[2]);
|
|
} else {
|
|
Pack(argv[1], argv[2]);
|
|
}
|
|
|
|
Global::AppCleanup();
|
|
fclose(gLog);
|
|
|
|
exit(0);
|
|
}
|
|
|