mirror of
https://github.com/fadden/nulib2.git
synced 2024-11-07 11:06:10 +00:00
300 lines
8.8 KiB
C
300 lines
8.8 KiB
C
/*
|
|
* NuFX archive manipulation library
|
|
* Copyright (C) 2000 by Andy McFadden, All Rights Reserved.
|
|
* This is free software; you can redistribute it and/or modify it under the
|
|
* terms of the GNU Library General Public License, see the file COPYING.LIB.
|
|
*
|
|
* Support for the "bzip2" (BTW+Huffman) algorithm, via "libbz2".
|
|
*
|
|
* This compression format is totally unsupported on the Apple II. This
|
|
* is provided primarily for the benefit of Apple II emulators that want
|
|
* a better storage format for disk images than SHK+LZW or a ZIP file.
|
|
*
|
|
* This code was developed and tested with libz2 version 1.0.2. Visit
|
|
* http://sources.redhat.com/bzip2/ for more information.
|
|
*/
|
|
#include "NufxLibPriv.h"
|
|
|
|
#ifdef ENABLE_BZIP2
|
|
#include "bzlib.h"
|
|
|
|
#define kBZBlockSize 8 /* use 800K blocks */
|
|
#define kBZVerbosity 1 /* library verbosity level (0-4) */
|
|
|
|
|
|
/*
|
|
* Alloc and free functions provided to libbz2.
|
|
*/
|
|
static void*
|
|
Nu_bzalloc(void* opaque, int items, int size)
|
|
{
|
|
return Nu_Malloc(opaque, items * size);
|
|
}
|
|
static void
|
|
Nu_bzfree(void* opaque, void* address)
|
|
{
|
|
Nu_Free(opaque, address);
|
|
}
|
|
|
|
|
|
/*
|
|
* ===========================================================================
|
|
* Compression
|
|
* ===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* Compress "srcLen" bytes from "pStraw" to "fp".
|
|
*/
|
|
NuError
|
|
Nu_CompressBzip2(NuArchive* pArchive, NuStraw* pStraw, FILE* fp,
|
|
ulong srcLen, ulong* pDstLen, ushort* pCrc)
|
|
{
|
|
NuError err = kNuErrNone;
|
|
bz_stream bzstream;
|
|
int bzerr;
|
|
uchar* outbuf = nil;
|
|
|
|
Assert(pArchive != nil);
|
|
Assert(pStraw != nil);
|
|
Assert(fp != nil);
|
|
Assert(srcLen > 0);
|
|
Assert(pDstLen != nil);
|
|
Assert(pCrc != nil);
|
|
|
|
err = Nu_AllocCompressionBufferIFN(pArchive);
|
|
if (err != kNuErrNone)
|
|
return err;
|
|
|
|
/* allocate a similarly-sized buffer for the output */
|
|
outbuf = Nu_Malloc(pArchive, kNuGenCompBufSize);
|
|
BailAlloc(outbuf);
|
|
|
|
/*
|
|
* Initialize the bz2lib stream.
|
|
*/
|
|
bzstream.bzalloc = Nu_bzalloc;
|
|
bzstream.bzfree = Nu_bzfree;
|
|
bzstream.opaque = pArchive;
|
|
bzstream.next_in = nil;
|
|
bzstream.avail_in = 0;
|
|
bzstream.next_out = outbuf;
|
|
bzstream.avail_out = kNuGenCompBufSize;
|
|
|
|
/* fourth arg is "workFactor"; set to zero for default (30) */
|
|
bzerr = BZ2_bzCompressInit(&bzstream, kBZBlockSize, kBZVerbosity, 0);
|
|
if (bzerr != BZ_OK) {
|
|
err = kNuErrInternal;
|
|
if (bzerr == BZ_CONFIG_ERROR) {
|
|
Nu_ReportError(NU_BLOB, err, "error configuring bz2lib");
|
|
} else {
|
|
Nu_ReportError(NU_BLOB, err,
|
|
"call to BZ2_bzCompressInit failed (bzerr=%d)", bzerr);
|
|
}
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Loop while we have data.
|
|
*/
|
|
do {
|
|
ulong getSize;
|
|
int action;
|
|
|
|
/* should be able to read a full buffer every time */
|
|
if (bzstream.avail_in == 0 && srcLen) {
|
|
getSize = (srcLen > kNuGenCompBufSize) ? kNuGenCompBufSize : srcLen;
|
|
DBUG(("+++ reading %ld bytes\n", getSize));
|
|
|
|
err = Nu_StrawRead(pArchive, pStraw, pArchive->compBuf, getSize);
|
|
if (err != kNuErrNone) {
|
|
Nu_ReportError(NU_BLOB, err, "bzip2 read failed");
|
|
goto bz_bail;
|
|
}
|
|
|
|
srcLen -= getSize;
|
|
|
|
*pCrc = Nu_CalcCRC16(*pCrc, pArchive->compBuf, getSize);
|
|
|
|
bzstream.next_in = pArchive->compBuf;
|
|
bzstream.avail_in = getSize;
|
|
}
|
|
|
|
if (srcLen == 0)
|
|
action = BZ_FINISH; /* tell libbz2 that we're done */
|
|
else
|
|
action = BZ_RUN; /* more to come! */
|
|
|
|
bzerr = BZ2_bzCompress(&bzstream, action);
|
|
if (bzerr != BZ_RUN_OK && bzerr != BZ_FINISH_OK && bzerr != BZ_STREAM_END)
|
|
{
|
|
err = kNuErrInternal;
|
|
Nu_ReportError(NU_BLOB, err,
|
|
"libbz2 compress call failed (bzerr=%d)", bzerr);
|
|
goto bz_bail;
|
|
}
|
|
|
|
/* write when we're full or when we're done */
|
|
if (bzstream.avail_out == 0 ||
|
|
(bzerr == BZ_STREAM_END && bzstream.avail_out != kNuGenCompBufSize))
|
|
{
|
|
DBUG(("+++ writing %d bytes\n",
|
|
(uchar*)bzstream.next_out - outbuf));
|
|
err = Nu_FWrite(fp, outbuf, (uchar*)bzstream.next_out - outbuf);
|
|
if (err != kNuErrNone) {
|
|
Nu_ReportError(NU_BLOB, err, "fwrite failed in bzip2");
|
|
goto bz_bail;
|
|
}
|
|
|
|
bzstream.next_out = outbuf;
|
|
bzstream.avail_out = kNuGenCompBufSize;
|
|
}
|
|
} while (bzerr != BZ_STREAM_END);
|
|
|
|
*pDstLen = bzstream.total_out_lo32;
|
|
Assert(bzstream.total_out_hi32 == 0); /* no huge files for us */
|
|
|
|
bz_bail:
|
|
BZ2_bzCompressEnd(&bzstream); /* free up any allocated structures */
|
|
|
|
bail:
|
|
if (outbuf != nil)
|
|
free(outbuf);
|
|
return err;
|
|
}
|
|
|
|
|
|
/*
|
|
* ===========================================================================
|
|
* Expansion
|
|
* ===========================================================================
|
|
*/
|
|
|
|
/*
|
|
* Expand from "infp" to "pFunnel".
|
|
*/
|
|
NuError
|
|
Nu_ExpandBzip2(NuArchive* pArchive, const NuRecord* pRecord,
|
|
const NuThread* pThread, FILE* infp, NuFunnel* pFunnel, ushort* pCrc)
|
|
{
|
|
NuError err = kNuErrNone;
|
|
bz_stream bzstream;
|
|
int bzerr;
|
|
ulong compRemaining;
|
|
uchar* outbuf;
|
|
|
|
Assert(pArchive != nil);
|
|
Assert(pThread != nil);
|
|
Assert(infp != nil);
|
|
Assert(pFunnel != nil);
|
|
|
|
err = Nu_AllocCompressionBufferIFN(pArchive);
|
|
if (err != kNuErrNone)
|
|
return err;
|
|
|
|
/* allocate a similarly-sized buffer for the output */
|
|
outbuf = Nu_Malloc(pArchive, kNuGenCompBufSize);
|
|
BailAlloc(outbuf);
|
|
|
|
compRemaining = pThread->thCompThreadEOF;
|
|
|
|
/*
|
|
* Initialize the libbz2 stream.
|
|
*/
|
|
bzstream.bzalloc = Nu_bzalloc;
|
|
bzstream.bzfree = Nu_bzfree;
|
|
bzstream.opaque = pArchive;
|
|
bzstream.next_in = nil;
|
|
bzstream.avail_in = 0;
|
|
bzstream.next_out = outbuf;
|
|
bzstream.avail_out = kNuGenCompBufSize;
|
|
|
|
/* third arg is "small" (set nonzero to reduce mem) */
|
|
bzerr = BZ2_bzDecompressInit(&bzstream, kBZVerbosity, 0);
|
|
if (bzerr != BZ_OK) {
|
|
err = kNuErrInternal;
|
|
if (bzerr == BZ_CONFIG_ERROR) {
|
|
Nu_ReportError(NU_BLOB, err, "error configuring libbz2");
|
|
} else {
|
|
Nu_ReportError(NU_BLOB, err,
|
|
"call to BZ2_bzDecompressInit failed (bzerr=%d)", bzerr);
|
|
}
|
|
goto bail;
|
|
}
|
|
|
|
/*
|
|
* Loop while we have data.
|
|
*/
|
|
do {
|
|
ulong getSize;
|
|
|
|
/* read as much as we can */
|
|
if (bzstream.avail_in == 0) {
|
|
getSize = (compRemaining > kNuGenCompBufSize) ?
|
|
kNuGenCompBufSize : compRemaining;
|
|
DBUG(("+++ reading %ld bytes (%ld left)\n", getSize,
|
|
compRemaining));
|
|
|
|
err = Nu_FRead(infp, pArchive->compBuf, getSize);
|
|
if (err != kNuErrNone) {
|
|
Nu_ReportError(NU_BLOB, err, "bzip2 read failed");
|
|
goto bz_bail;
|
|
}
|
|
|
|
compRemaining -= getSize;
|
|
|
|
bzstream.next_in = pArchive->compBuf;
|
|
bzstream.avail_in = getSize;
|
|
}
|
|
|
|
/* uncompress the data */
|
|
bzerr = BZ2_bzDecompress(&bzstream);
|
|
if (bzerr != BZ_OK && bzerr != BZ_STREAM_END) {
|
|
err = kNuErrInternal;
|
|
Nu_ReportError(NU_BLOB, err,
|
|
"libbz2 decompress call failed (bzerr=%d)", bzerr);
|
|
goto bz_bail;
|
|
}
|
|
|
|
/* write every time there's anything (buffer will usually be full) */
|
|
if (bzstream.avail_out != kNuGenCompBufSize) {
|
|
DBUG(("+++ writing %d bytes\n",(uchar*)bzstream.next_out - outbuf));
|
|
err = Nu_FunnelWrite(pArchive, pFunnel, outbuf,
|
|
(uchar*)bzstream.next_out - outbuf);
|
|
if (err != kNuErrNone) {
|
|
Nu_ReportError(NU_BLOB, err, "write failed in bzip2");
|
|
goto bz_bail;
|
|
}
|
|
|
|
if (pCrc != nil)
|
|
*pCrc = Nu_CalcCRC16(*pCrc, outbuf,
|
|
(uchar*) bzstream.next_out - outbuf);
|
|
|
|
bzstream.next_out = outbuf;
|
|
bzstream.avail_out = kNuGenCompBufSize;
|
|
}
|
|
} while (bzerr == BZ_OK);
|
|
|
|
Assert(bzerr == BZ_STREAM_END); /* other errors should've been caught */
|
|
|
|
Assert(bzstream.total_out_hi32 == 0); /* no huge files for us */
|
|
|
|
if (bzstream.total_out_lo32 != pThread->actualThreadEOF) {
|
|
err = kNuErrBadData;
|
|
Nu_ReportError(NU_BLOB, err,
|
|
"size mismatch on expanded bzip2 file (%d vs %ld)",
|
|
bzstream.total_out_lo32, pThread->actualThreadEOF);
|
|
goto bz_bail;
|
|
}
|
|
|
|
bz_bail:
|
|
BZ2_bzDecompressEnd(&bzstream); /* free up any allocated structures */
|
|
|
|
bail:
|
|
if (outbuf != nil)
|
|
free(outbuf);
|
|
return err;
|
|
}
|
|
|
|
#endif /*ENABLE_BZIP2*/
|