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////////////////////////////////////////////////////////////////////////////////////////////////////
///
/// bzip2 file i/o Լ - UnAlzbzlib.c (bzlib.c) ִ Լ ó ؼ
/// ణ ҽ̴..
/// FILE* handle κе Ǿ.
///
/// @author kippler@gmail.com
/// @date 2004-10-03 3:09:11
///
////////////////////////////////////////////////////////////////////////////////////////////////////
//#include "stdafx.h"
#include <zlib.h>
#include <bzlib.h>
#include "UnAlz.h"
// from bzlib_private.h of bzip2
typedef char Char;
typedef unsigned char Bool;
typedef unsigned char UChar;
typedef int Int32;
typedef unsigned int UInt32;
typedef short Int16;
typedef unsigned short UInt16;
#define True ((Bool)1)
#define False ((Bool)0)
typedef struct {
CUnAlz* handle;
Char buf[BZ_MAX_UNUSED];
Int32 bufN;
Bool writing;
bz_stream strm;
Int32 lastErr;
Bool initialisedOk;
}
MybzFile;
#define BZ_SETERR(eee){if (bzerror != NULL) *bzerror = eee;if (bzf != NULL) bzf->lastErr = eee;}
////////////////////////////////////////////////////////////////////////////////////////////////////
/// BZIP2 ó Լ
/// @param bzerror
/// @param f
/// @param verbosity
/// @param _small
/// @param unused
/// @param nUnused
/// @return
/// @date 2004-10-03 3:16:45
////////////////////////////////////////////////////////////////////////////////////////////////////
CUnAlz::MYBZFILE* CUnAlz::BZ2_bzReadOpen(int* bzerror, CUnAlz* f, int verbosity, int _small,void* unused, int nUnused)
{
MybzFile* bzf = NULL;
int ret;
BZ_SETERR(BZ_OK);
if (f == NULL ||
(_small != 0 && _small != 1) ||
(verbosity < 0 || verbosity > 4) ||
(unused == NULL && nUnused != 0) ||
(unused != NULL && (nUnused < 0 || nUnused > BZ_MAX_UNUSED)))
{ BZ_SETERR(BZ_PARAM_ERROR); return NULL; };
// if (f->FEof())
// { BZ_SETERR(BZ_IO_ERROR); return NULL; };
bzf = (MybzFile*)malloc ( sizeof(MybzFile) );
if (bzf == NULL)
{ BZ_SETERR(BZ_MEM_ERROR); return NULL; };
BZ_SETERR(BZ_OK);
bzf->initialisedOk = False;
bzf->handle = f;
bzf->bufN = 0;
bzf->writing = False;
bzf->strm.bzalloc = NULL;
bzf->strm.bzfree = NULL;
bzf->strm.opaque = NULL;
while (nUnused > 0) {
bzf->buf[bzf->bufN] = *((UChar*)(unused)); bzf->bufN++;
unused = ((void*)( 1 + ((UChar*)(unused)) ));
nUnused--;
}
ret = BZ2_bzDecompressInit ( &(bzf->strm), verbosity, _small );
if (ret != BZ_OK)
{ BZ_SETERR(ret); free(bzf); return NULL; };
bzf->strm.avail_in = bzf->bufN;
bzf->strm.next_in = bzf->buf;
bzf->initialisedOk = True;
return bzf;
}
int CUnAlz::BZ2_bzread(MYBZFILE* b, void* buf, int len )
{
int bzerr, nread;
if (((MybzFile*)b)->lastErr == BZ_STREAM_END) return 0;
nread = BZ2_bzRead(&bzerr,b,buf,len);
if (bzerr == BZ_OK || bzerr == BZ_STREAM_END) {
return nread;
} else {
return -1;
}
}
int CUnAlz::BZ2_bzRead(int* bzerror, MYBZFILE* b, void* buf, int len)
{
Int32 n, ret;
MybzFile* bzf = (MybzFile*)b;
BOOL bIsEncrypted = bzf->handle->IsEncryptedFile(); // ȣɸ ΰ?
BZ_SETERR(BZ_OK);
if (bzf == NULL || buf == NULL || len < 0)
{ BZ_SETERR(BZ_PARAM_ERROR); return 0; };
if (bzf->writing)
{ BZ_SETERR(BZ_SEQUENCE_ERROR); return 0; };
if (len == 0)
{ BZ_SETERR(BZ_OK); return 0; };
bzf->strm.avail_out = len;
bzf->strm.next_out = (char*)buf;
while (True) {
// if (ferror(bzf->handle))
// { BZ_SETERR(BZ_IO_ERROR); return 0; };
if (bzf->strm.avail_in == 0 && !bzf->handle->FEof()) {
bzf->handle->FRead(bzf->buf, sizeof(UChar)*BZ_MAX_UNUSED, &n);
if(bIsEncrypted)
bzf->handle->DecryptingData(n, (BYTE *)bzf->buf); // xf86 NOT tested -> tested
if(n==0)
{ BZ_SETERR(BZ_IO_ERROR); return 0; };
bzf->bufN = n;
bzf->strm.avail_in = bzf->bufN;
bzf->strm.next_in = bzf->buf;
}
ret = BZ2_bzDecompress ( &(bzf->strm) );
if (ret != BZ_OK && ret != BZ_STREAM_END)
{ BZ_SETERR(ret); return 0; };
if (ret == BZ_OK && bzf->handle->FEof() &&
bzf->strm.avail_in == 0 && bzf->strm.avail_out > 0)
{ BZ_SETERR(BZ_UNEXPECTED_EOF); return 0; };
if (ret == BZ_STREAM_END)
{ BZ_SETERR(BZ_STREAM_END);
return len - bzf->strm.avail_out; };
if (bzf->strm.avail_out == 0)
{ BZ_SETERR(BZ_OK); return len; };
}
return 0; /*not reached*/
}
void CUnAlz::BZ2_bzReadClose( int *bzerror, MYBZFILE *b )
{
MybzFile* bzf = (MybzFile*)b;
BZ_SETERR(BZ_OK);
if (bzf == NULL)
{ BZ_SETERR(BZ_OK); return; };
if (bzf->writing)
{ BZ_SETERR(BZ_SEQUENCE_ERROR); return; };
if (bzf->initialisedOk)
(void)BZ2_bzDecompressEnd ( &(bzf->strm) );
free ( bzf );
}
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