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OS/2 Shareware BBS: 9 Archive
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09-Archive.zip
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zip21.zip
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vms
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vms_pk.c
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C/C++ Source or Header
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1996-04-01
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415 lines
/*************************************************************************
* *
* Copyright (C) 1993 Igor Mandrichenko. *
* Permission is granted to any individual or institution to use, copy, *
* or redistribute this software so long as all of the original files *
* are included unmodified, and that this copyright notice is retained. *
* *
*************************************************************************/
/*
* vms_pk.c by Igor Mandrichenko
*
* version 2.0 20-mar-1993
* Generates PKWARE version of VMS attributes
* extra field according to appnote 2.0.
* Uses low level QIO-ACP interface.
* version 2.0-1 10-apr-1993
* Save ACLs
* version 2.1 24-aug-1993
* By default produce 0x010C extra record ID instead of
* PKWARE's 0x000C. The format is mostly compatible with
* PKWARE.
* Incompatibility (?): zip produces multiple ACE
* fields.
* version 2.1-1 Clean extra fields in vms_get_attributes().
* Fixed bug with EOF.
* version 2.1-2 15-sep-1995, Chr. Spieler
* Removed extra fields cleanup from vms_get_attributes().
* This is now done in zipup.c
* Modified (according to UnZip's vms.[ch]) the fib stuff
* for DEC C (AXP,VAX) support.
* version 2.2 28-sep-1995, Chr. Spieler
* Reorganized code for easier maintance of the two
* incompatible flavours (IM style and PK style) VMS
* attribute support. Generic functions (common to
* both flavours) are now collected in a `wrapper'
* source file that includes one of the VMS attribute
* handlers.
* Made extra block header conforming to PKware's
* specification (extra block header has a length
* of four bytes, two bytes for a signature, and two
* bytes for the length of the block excluding this
* header.
* version 2.2-1 19-oct-1995, Chr. Spieler
* Fixed bug in CRC calculation.
* Use official PK VMS extra field id.
*/
#ifdef VMS /* For VMS only ! */
#ifndef __SSDEF_LOADED
#include <ssdef.h>
#endif
#ifndef VMS_ZIP
#define VMS_ZIP
#endif
#include "vms/vms.h"
#include "vms/vmsdefs.h"
#ifndef ERR
#define ERR(x) (((x)&1)==0)
#endif
#ifndef NULL
#define NULL (void*)(0L)
#endif
#ifndef UTIL
static struct PK_info PK_def_info =
{
ATR$C_RECATTR, ATR$S_RECATTR, {0},
ATR$C_UCHAR, ATR$S_UCHAR, {0},
ATR$C_CREDATE, ATR$S_CREDATE, {0},
ATR$C_REVDATE, ATR$S_REVDATE, {0},
ATR$C_EXPDATE, ATR$S_EXPDATE, {0},
ATR$C_BAKDATE, ATR$S_BAKDATE, {0},
ATR$C_ASCDATES, sizeof(ush), 0,
ATR$C_UIC, ATR$S_UIC, {0},
ATR$C_FPRO, ATR$S_FPRO, {0},
ATR$C_RPRO, ATR$S_RPRO, {0},
ATR$C_JOURNAL, ATR$S_JOURNAL, {0}
};
/* Forward declarations of public functions: */
struct ioctx *vms_open(char *file, char *how);
int vms_read(register struct ioctx *ctx,
register char *buf, register int size);
int vms_error(struct ioctx *ctx);
int vms_rewind(struct ioctx *ctx);
void vms_get_attributes(struct ioctx *ctx, struct zlist far *z);
int vms_close(struct ioctx *ctx);
/*---------------*
| vms_open() |
*---------------*
| This routine opens file for reading fetching its attributes.
| Returns pointer to file description structure.
*/
struct ioctx *vms_open(file,how)
char *file,*how;
{
static struct atrdef Atr[VMS_MAX_ATRCNT+1];
static struct NAM Nam;
static struct fibdef Fib;
static struct dsc$descriptor FibDesc =
{sizeof(Fib),DSC$K_DTYPE_Z,DSC$K_CLASS_S,(char *)&Fib};
static struct dsc$descriptor_s DevDesc =
{0,DSC$K_DTYPE_T,DSC$K_CLASS_S,&Nam.nam$t_dvi[1]};
static struct dsc$descriptor_s FileName =
{0,DSC$K_DTYPE_T,DSC$K_CLASS_S,0};
static char EName[NAM$C_MAXRSS];
static char RName[NAM$C_MAXRSS];
struct FAB Fab;
register struct ioctx *ctx;
register struct fatdef *fat;
int status;
int i;
ulg efblk,hiblk;
if( (ctx=(struct ioctx *)malloc(sizeof(struct ioctx))) == NULL )
return NULL;
ctx -> PKi = PK_def_info;
#define FILL_REQ(ix,id,b) { \
Atr[ix].atr$l_addr = &(b); \
Atr[ix].atr$w_type = (id); \
Atr[ix].atr$w_size = sizeof(b); \
}
FILL_REQ(0, ATR$C_RECATTR, ctx->PKi.ra);
FILL_REQ(1, ATR$C_UCHAR, ctx->PKi.uc);
FILL_REQ(2, ATR$C_REVDATE, ctx->PKi.rd);
FILL_REQ(3, ATR$C_EXPDATE, ctx->PKi.ed);
FILL_REQ(4, ATR$C_CREDATE, ctx->PKi.cd);
FILL_REQ(5, ATR$C_BAKDATE, ctx->PKi.bd);
FILL_REQ(6, ATR$C_ASCDATES, ctx->PKi.rn);
FILL_REQ(7, ATR$C_JOURNAL, ctx->PKi.jr);
FILL_REQ(8, ATR$C_RPRO, ctx->PKi.rp);
FILL_REQ(9, ATR$C_FPRO, ctx->PKi.fp);
FILL_REQ(10,ATR$C_UIC, ctx->PKi.ui);
FILL_REQ(11,ATR$C_ACLLENGTH,ctx->acllen);
FILL_REQ(12,ATR$C_READACL, ctx->aclbuf);
Atr[13].atr$w_type = 0; /* End of ATR list */
Atr[13].atr$w_size = 0;
Atr[13].atr$l_addr = (byte *)NULL;
/* initialize RMS structures, we need a NAM to retrieve the FID */
Fab = cc$rms_fab;
Fab.fab$l_fna = file ; /* name of file */
Fab.fab$b_fns = strlen(file);
Fab.fab$l_nam = &Nam; /* FAB has an associated NAM */
Nam = cc$rms_nam;
Nam.nam$l_esa = EName; /* expanded filename */
Nam.nam$b_ess = sizeof(EName);
Nam.nam$l_rsa = RName; /* resultant filename */
Nam.nam$b_rss = sizeof(RName);
/* do $PARSE and $SEARCH here */
status = sys$parse(&Fab);
if (!(status & 1)) return NULL;
/* search for the first file.. If none signal error */
status = sys$search(&Fab);
if (!(status & 1)) return NULL;
/* initialize Device name length, note that this points into the NAM
to get the device name filled in by the $PARSE, $SEARCH services */
DevDesc.dsc$w_length = Nam.nam$t_dvi[0];
status = sys$assign(&DevDesc,&ctx->chan,0,0);
if (!(status & 1)) return NULL;
FileName.dsc$a_pointer = Nam.nam$l_name;
FileName.dsc$w_length = Nam.nam$b_name+Nam.nam$b_type+Nam.nam$b_ver;
/* Initialize the FIB */
Fib.FIB$L_ACCTL = FIB$M_NOWRITE;
for (i=0;i<3;i++)
Fib.FIB$W_FID[i]=Nam.nam$w_fid[i];
for (i=0;i<3;i++)
Fib.FIB$W_DID[i]=Nam.nam$w_did[i];
/* Use the IO$_ACCESS function to return info about the file */
status = sys$qiow(0,ctx->chan,IO$_ACCESS|IO$M_ACCESS,&ctx->iosb,0,0,
&FibDesc,&FileName,0,0,&Atr,0);
if (ERR(status) || ERR(status = ctx->iosb.status))
{
vms_close(ctx);
return NULL;
}
fat = (struct fatdef *)&(ctx -> PKi.ra);
#define SWAPW(x) ( (((x)>>16)&0xFFFF) + ((x)<<16) )
efblk = SWAPW(fat->fat$l_efblk);
hiblk = SWAPW(fat->fat$l_hiblk);
if( efblk == 0 && fat -> fat$w_ffbyte == 0 )
ctx -> size =
ctx -> rest = hiblk * 512;
else
ctx -> size =
ctx -> rest = (efblk - 1) * 512 + fat -> fat$w_ffbyte;
ctx -> status = SS$_NORMAL;
ctx -> vbn = 1;
return ctx;
}
#define KByte 1024
/*----------------*
| vms_read() |
*----------------*
| Reads file block by block into the buffer.
| Stops on EOF, returns number of bytes actually read.
| Note: size of the buffer must be greater than or equal to 512 !
*/
int vms_read(ctx, buf, size)
register struct ioctx *ctx;
register char *buf;
register int size;
{
int status;
long nr=0;
if (ctx -> rest <= 0 || ctx -> status == SS$_ENDOFFILE)
return 0; /* Eof */
if(size <= 0)
return 0;
if(size > 16*KByte)
size = 16*KByte;
else if(size > 512)
size &= ~511L; /* Round to integer number of blocks */
do
{
status = sys$qiow(0, ctx->chan, IO$_READVBLK,
&ctx->iosb, 0, 0,
buf, size, ctx->vbn,0,0,0);
ctx->vbn += size>>9;
if( size < 512 )
++ctx->vbn;
if( !ERR(status) )
status = ctx->iosb.status;
if( !ERR(status) || status == SS$_ENDOFFILE )
{
register int count;
if( status == SS$_ENDOFFILE )
count = ctx->rest;
else
count = ctx->iosb.count;
size -= count;
buf += count;
nr += count;
}
} while( !ERR(status) && size > 0 );
if (!ERR(status))
{
ctx -> status = SS$_NORMAL;
ctx -> rest -= nr;
}
else if(status == SS$_ENDOFFILE)
{
ctx -> status = SS$_ENDOFFILE;
ctx -> rest = 0;
}
else
{
ctx -> status = status;
ctx -> rest -= nr;
}
return nr;
}
/*-----------------*
| vms_error() |
*-----------------*
| Returns whether last operation on the file caused an error
*/
int vms_error(ctx)
struct ioctx *ctx;
{ /* EOF is not actual error */
return ERR(ctx->status) && (ctx->status != SS$_ENDOFFILE);
}
/*------------------*
| vms_rewind() |
*------------------*
| Rewinds file to the beginning for the next vms_read().
*/
int vms_rewind(ctx)
struct ioctx *ctx;
{
ctx -> vbn = 1;
ctx -> rest = ctx -> size;
return 0;
}
/*--------------------------*
| vms_get_attributes() |
*--------------------------*
| Returns pointer to malloc'ed PKWARE extra field with file attributes.
| File must be open already by vms_open()
*/
void vms_get_attributes(ctx,z,z_utim)
struct ioctx *ctx;
struct zlist far *z; /* zip entry to compress */
ztimbuf *z_utim;
{
byte *p,*b;
struct PK_header *h;
int l;
if( !vms_native )
{
#ifdef USE_EF_UX_TIME
/*
* A `portable' zipfile entry is created. Create an "UX" extra block
* containing UNIX style time stamps, which helps maintaining the
* `real' "last modified" time when the archive is tranported
* across time zone boundaries.
*/
if ((b = (uch *)malloc(EB_HEADSIZE+EB_UX_MINLEN)) == NULL)
return;
b[0] = 'U';
b[1] = 'X';
b[2] = EB_UX_MINLEN; /* length of data part of e.f. */
b[3] = 0;
b[4] = (byte)(z_utim->actime);
b[5] = (byte)(z_utim->actime >> 8);
b[6] = (byte)(z_utim->actime >> 16);
b[7] = (byte)(z_utim->actime >> 24);
b[8] = (byte)(z_utim->modtime);
b[9] = (byte)(z_utim->modtime >> 8);
b[10] = (byte)(z_utim->modtime >> 16);
b[11] = (byte)(z_utim->modtime >> 24);
z->cext = z->ext = (EB_HEADSIZE+EB_UX_MINLEN);
z->cextra = z->extra = (char*)b;
#endif /* USE_EF_UX_TIME */
return;
}
l = PK_HEADER_SIZE+sizeof(ctx->PKi);
if(ctx->acllen > 0)
l += PK_FLDHDR_SIZE + ctx->acllen;
b = (uch *)malloc(l);
if( b==NULL )
return;
h = (struct PK_header *)b;
h->tag = PK_SIGNATURE;
h->size = l - EB_HEADSIZE;
p = (h->data);
/* Copy default set of attributes */
memcpy(h->data,(uch*)&(ctx->PKi),sizeof(ctx->PKi));
p += sizeof(ctx->PKi);
if( ctx->acllen > 0 )
{
struct PK_field *f;
if(dosify)
zipwarn("file has ACL, may be incompatible with PKUNZIP","");
f = (struct PK_field *)p;
f->tag = ATR$C_ADDACLENT;
f->size = ctx->acllen;
memcpy((char *)&(f->value[0]),ctx->aclbuf,ctx->acllen);
p += PK_FLDHDR_SIZE + ctx->acllen;
}
h->crc32 = crc32(0L, (uch *)NULL, 0); /* Init CRC register */
h->crc32 = crc32(h->crc32, (uch *)(h->data), l - PK_HEADER_SIZE);
z->ext = z->cext = l;
z->extra = z->cextra = (char *)b;
}
int vms_close(ctx)
struct ioctx *ctx;
{
sys$dassgn(ctx->chan);
free(ctx);
return 0;
}
#endif /* !_UTIL */
#endif /* VMS */