cmsmvs.c

给出了 zip 压缩算法的完整实现过程。

/*
  Copyright (c) 1990-2005 Info-ZIP.  All rights reserved.

  See the accompanying file LICENSE, version 2004-May-22 or later
  (the contents of which are also included in zip.h) for terms of use.
  If, for some reason, both of these files are missing, the Info-ZIP license
  also may be found at:  ftp://ftp.info-zip.org/pub/infozip/license.html
*/
/*
 * routines common to VM/CMS and MVS
 */

#include "zip.h"

#include <stdio.h>
#include <time.h>
#include <errno.h>

#ifndef MVS  /* MVS has perfectly good definitions of the following */
int stat(const char *path, struct stat *buf)
{
   if ((buf->fp = fopen(path, "r")) != NULL) {
      fldata_t fdata;
      if (fldata( buf->fp, buf->fname, &fdata ) == 0) {
         buf->st_dev  = fdata.__device;
         buf->st_mode = *(short *)(&fdata);
      }
      strcpy( buf->fname, path );
      fclose(buf->fp);
   }
   return (buf->fp != NULL ? 0 : 1);
}
#endif /* MVS */


#ifndef UTIL    /* the companion #endif is a bit of ways down ... */

#define PAD 0
#define PATH_END '/'

/* Library functions not in (most) header files */

#ifdef USE_ZIPMAIN
int main OF((void));
#endif

int utime OF((char *, ztimbuf *));

extern char *label;
local ulg label_time = 0;
local ulg label_mode = 0;
local time_t label_utim = 0;

#ifndef MVS  /* MVS has perfectly good definitions of the following */
int fstat(int fd, struct stat *buf)
{
   fldata_t fdata;

   if ((fd != -1) && (fldata( (FILE *)fd, buf->fname, &fdata ) == 0)) {
      buf->st_dev  = fdata.__device;
      buf->st_mode = *(short *)(&fdata);
      buf->fp      = (FILE *)fd;
      return 0;
   }
   return -1;
}
#endif /* MVS */


char *ex2in(x, isdir, pdosflag)
char *x;                /* external file name */
int isdir;              /* input: x is a directory */
int *pdosflag;          /* output: force MSDOS file attributes? */
/* Convert the external file name to a zip file name, returning the malloc'ed
   string or NULL if not enough memory. */
{
  char *n;              /* internal file name (malloc'ed) */
  char *t;              /* shortened name */
  int dosflag;
  char mem[10] = "";    /* member name */
  char ext[10] = "";     /* extension name */

  dosflag = dosify;  /* default for non-DOS non-OS/2 */

  /* Find starting point in name before doing malloc */
  for (t = x; *t == '/'; t++)
    ;

  /* Make changes, if any, to the copied name (leave original intact) */
  if (!pathput)
    t = last(t, PATH_END);

  /* Malloc space for internal name and copy it */
  if ((n = malloc(strlen(t) + 1)) == NULL)
    return NULL;
  strcpy(n, t);

#ifdef MVS
  /* strip quotes from name, non-OE format */
  if (*n == '\'' && (t = strrchr(n, '\'')) != n) {
    if (!*(t+1)) {
      /* yes, it is a quoted name */
      int l = strlen(n) - 2;
      memmove(n, n+1, l);
      *(n+l) = '\0';
    }
  }
  /* Change member names to fn.ext */
  if (t = strrchr(n, '(')) {
     *t = '\0';
     strcpy(mem,t+1);        /* Save member name */
     if (t = strchr(mem, ')')) *t = '\0';         /* Set end of mbr */
     /* Save extension */
     if (t = strrchr(n, '.')) t++;
     else t = n;
     strcpy(ext,t);
     /* Build name as "member.ext" */
     strcpy(t,mem);
     strcat(t,".");
     strcat(t,ext);
  }

  /* Change all but the last '.' to '/' */
  if (t = strrchr(n, '.')) {
     while (--t > n)
        if (*t == '.')
          *t = '/';
  }
#else
  /* On CMS, remove the filemode (all past 2nd '.') */
  if (t = strchr(n, '.'))
     if (t = strchr(t+1, '.'))
        *t = '\0';
  t = n;
#endif

  strcpy(n, t);

  if (isdir == 42) return n;    /* avoid warning on unused variable */

  if (dosify)
    msname(n);                  /* msname() needs string in native charset */

  strtoasc(n, n);

  /* Returned malloc'ed name */
  if (pdosflag)
    *pdosflag = dosflag;
  return n;
}


char *in2ex(n)
char *n;                /* internal file name */
/* Convert the zip file name to an external file name, returning the malloc'ed
   string or NULL if not enough memory. */
{
  char *x;              /* external file name */

  if ((x = malloc(strlen(n) + 1 + PAD)) == NULL)
    return NULL;
  strtoebc(x, n);
  return x;
}


void stamp(f, d)
char *f;                /* name of file to change */
ulg d;                  /* dos-style time to change it to */
/* Set last updated and accessed time of file f to the DOS time d. */
{
  ztimbuf u;            /* argument for utime() */

  /* Convert DOS time to time_t format in u.actime and u.modtime */
  u.actime = u.modtime = dos2unixtime(d);

  utime(f, &u);
}


ulg filetime(f, a, n, t)
char *f;                /* name of file to get info on */
ulg *a;                 /* return value: file attributes */
long *n;                /* return value: file size */
iztimes *t;             /* return value: access, modific. and creation times */
{
  FILE *stream;
  time_t ltime;

  if (strcmp(f, "-") != 0) {    /* if not compressing stdin */
     Trace((mesg, "opening file '%s' with '%s'\n", f, FOPR));
     if ((stream = fopen(f, FOPR)) == (FILE *)NULL) {
        return 0;
     } else {
        if (n != NULL) {
           /* With byteseek, this will work */
           fseek(stream, 0L, SEEK_END);
           *n = ftell(stream);
           Trace((mesg, "file size = %lu\n", *((ulg *)n)));
        }
        fclose(stream);
     }
  }
  else {
     /* Reading from stdin */
     if (n != NULL) {
        *n = -1L;
     }
  }

  /* Return current time for all the times -- for now */
  time(&ltime);
  if (t != NULL)
     t->atime = t->mtime = t->ctime = ltime;

  /* Set attributes (always a file) */
  if (a != NULL)
     *a = 0;

  return unix2dostime(&ltime);
}



int set_extra_field(z, z_utim)
struct zlist far *z;
iztimes *z_utim;
/* create extra field and change z->att if desired */
{
   fldata_t fdata;
   FILE *stream;
   char *eb_ptr;
#ifdef USE_EF_UT_TIME
   extent ef_l_len = (EB_HEADSIZE+EB_UT_LEN(1));
#else /* !USE_EF_UT_TIME */
   extent ef_l_len = 0;
#endif /* ?USE_EF_UT_TIME */
   int set_cmsmvs_eb = 0;

/*translate_eol = 0;*/
  if (aflag == ASCII) {
     z->att = ASCII;
  } else {
    if (bflag)
      z->att = BINARY;
    else
      z->att = __EBCDIC;
    ef_l_len += sizeof(fdata)+EB_HEADSIZE;
    set_cmsmvs_eb = 1;
  }

  if (ef_l_len > 0) {
    z->extra = (char *)malloc(ef_l_len);
    if (z->extra == NULL) {
       printf("\nFLDATA : Unable to allocate memory !\n");
       return ZE_MEM;
    }
    z->cext = z->ext = ef_l_len;
    eb_ptr = z->cextra = z->extra;

    if (set_cmsmvs_eb) {
      if (bflag)
/***    stream = fopen(z->zname,"rb,type=record");   $RGH$ ***/
        stream = fopen(z->name,"rb");
      else
        stream = fopen(z->name,"r");
      if (stream == NULL) {
        printf("\nFLDATA : Could not open file : %s !\n",z->name);
        printf("Error %d: '%s'\n", errno, strerror(errno));
        return ZE_NONE;
      }

      fldata(stream,z->name,&fdata);
      /*put the system ID */
#ifdef VM_CMS
      *(eb_ptr) = EF_VMCMS & 0xFF;
      *(eb_ptr+1) = EF_VMCMS >> 8;
#else
      *(eb_ptr) = EF_MVS & 0xFF;
      *(eb_ptr+1) = EF_MVS >> 8;
#endif
      *(eb_ptr+2) = sizeof(fdata) & 0xFF;
      *(eb_ptr+3) = sizeof(fdata) >> 8;

      memcpy(eb_ptr+EB_HEADSIZE,&fdata,sizeof(fdata));
      fclose(stream);
#ifdef USE_EF_UT_TIME
      eb_ptr += (sizeof(fdata)+EB_HEADSIZE);
#endif /* USE_EF_UT_TIME */
    }
#ifdef USE_EF_UT_TIME
    eb_ptr[0]  = 0x55;                  /* ascii[(unsigned)('U')] */
    eb_ptr[1]  = 0x54;                  /* ascii[(unsigned)('T')] */
    eb_ptr[2]  = EB_UT_LEN(1);          /* length of data part of e.f. */
    eb_ptr[3]  = 0;
    eb_ptr[4]  = EB_UT_FL_MTIME;
    eb_ptr[5]  = (char)(z_utim->mtime);
    eb_ptr[6]  = (char)(z_utim->mtime >> 8);
    eb_ptr[7]  = (char)(z_utim->mtime >> 16);
    eb_ptr[8]  = (char)(z_utim->mtime >> 24);
#endif /* USE_EF_UT_TIME */
  }

  return ZE_OK;
}

int deletedir(d)
char *d;                /* directory to delete */
/* Delete the directory *d if it is empty, do nothing otherwise.
   Return the result of rmdir(), delete(), or system().
   For VMS, d must be in format [x.y]z.dir;1  (not [x.y.z]).
 */
{
    return 0;
}

#ifdef USE_ZIPMAIN
/* This function is called as main() to parse arguments                */
/* into argc and argv.  This is required for stand-alone               */
/* execution.  This calls the "real" main() when done.                 */

int main(void)
   {
    int  argc=0;
    char *argv[50];

    int  iArgLen;
    char argstr[256];
    char **pEPLIST, *pCmdStart, *pArgStart, *pArgEnd;

   /* Get address of extended parameter list from S/370 Register 0 */
   pEPLIST = (char **)__xregs(0);

   /* Null-terminate the argument string */
   pCmdStart = *(pEPLIST+0);
   pArgStart = *(pEPLIST+1);
   pArgEnd   = *(pEPLIST+2);
   iArgLen   = pArgEnd - pCmdStart + 1;

   /* Make a copy of the command string */
   memcpy(argstr, pCmdStart, iArgLen);
   argstr[iArgLen] = '\0';  /* Null-terminate */

   /* Store first token (cmd) */
   argv[argc++] = strtok(argstr, " ");

   /* Store the rest (args) */
   while (argv[argc-1])
      argv[argc++] = strtok(NULL, " ");
   argc--;  /* Back off last NULL entry */

   /* Call "real" main() function */
   return zipmain(argc, argv);

}
#endif /* USE_ZIPMAIN */

#endif /* !UTIL */


/******************************/
/*  Function version_local()  */
/******************************/

void version_local()
{
    char liblvlmsg [50+1];
    char *compiler = "?";
    char *platform = "?";
    char complevel[64];

    /* Map the runtime library level information */
    union {
       unsigned int iVRM;
       struct {
          unsigned int pd:4;    /* Product designation */
          unsigned int vv:4;    /* Version             */
          unsigned int rr:8;    /* Release             */
          unsigned int mm:16;   /* Modification level  */
       } xVRM;
    } VRM;


    /* Break down the runtime library level */
    VRM.iVRM = __librel();
    sprintf(liblvlmsg, "Using runtime library level %s V%dR%dM%d",
            (VRM.xVRM.pd==1 ? "LE" : "CE"),
            VRM.xVRM.vv, VRM.xVRM.rr, VRM.xVRM.mm);
    /* Note:  LE = Language Environment, CE = Common Env. (C/370). */
    /* This refers ONLY to the current runtimes, not the compiler. */


#ifdef VM_CMS
    platform = "VM/CMS";
    #ifdef __IBMC__
       compiler = "IBM C";
    #else
       compiler  = "C/370";
    #endif
#endif

#ifdef MVS
    platform = "MVS";
    #ifdef __IBMC__
       compiler = "IBM C/C++";
    #else
       compiler = "C/370";
    #endif
#endif

#ifdef __COMPILER_VER__
    VRM.iVRM = __COMPILER_VER__;
    sprintf(complevel," V%dR%dM%d",
            VRM.xVRM.vv, VRM.xVRM.rr, VRM.xVRM.mm);
#else
#ifdef __IBMC__
    sprintf(complevel," V%dR%d", __IBMC__ / 100, (__IBMC__ % 100)/10);
#else
    complevel[0] = '\0';
#endif
#endif


    printf("Compiled with %s%s for %s%s%s.\n\n",

    /* Add compiler name and level */
    compiler, complevel,

    /* Add platform */
    platform,

    /* Add timestamp */
#ifdef __DATE__
      " on " __DATE__
#ifdef __TIME__
      " at " __TIME__
#endif
#endif
      ".\n",
      liblvlmsg
    );
} /* end function version_local() */