dosname.c

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/* Unix/HPFS filename translation for FAT file systems */
/*  (with special unzip modifications:  sflag) */

/* Author: Kai Uwe Rommel */

#include "unzip.h"


extern int sflag;  /* user wants to allow blanks (e.g., "EA DATA. SF") */

void ChangeNameForFAT(char *name)
{
  char *src, *dst, *next, *ptr, *dot, *start;
  static char invalid[] = ":;,=+\"[]<>| \t";

  if ( isalpha(name[0]) && (name[1] == ':') )
    start = name + 2;
  else
    start = name;

  src = dst = start;
  if ( (*src == '/') || (*src == '\\') )
    src++, dst++;

  while ( *src )
  {
    for ( next = src; *next && (*next != '/') && (*next != '\\'); next++ );

    for ( ptr = src, dot = NULL; ptr < next; ptr++ )
      if ( *ptr == '.' )
      {
        dot = ptr; /* remember last dot */
        *ptr = '_';
      }

    if ( dot == NULL )
      for ( ptr = src; ptr < next; ptr++ )
        if ( *ptr == '_' )
          dot = ptr; /* remember last _ as if it were a dot */

    if ( dot && (dot > src) &&
         ((next - dot <= 4) ||
          ((next - src > 8) && (dot - src > 3))) )
    {
      if ( dot )
        *dot = '.';

      for ( ptr = src; (ptr < dot) && ((ptr - src) < 8); ptr++ )
        *dst++ = *ptr;

      for ( ptr = dot; (ptr < next) && ((ptr - dot) < 4); ptr++ )
        *dst++ = *ptr;
    }
    else
    {
      if ( dot && (next - src == 1) )
        *dot = '.';           /* special case: "." as a path component */

      for ( ptr = src; (ptr < next) && ((ptr - src) < 8); ptr++ )
        *dst++ = *ptr;
    }

    *dst++ = *next; /* either '/' or 0 */

    if ( *next )
    {
      src = next + 1;

      if ( *src == 0 ) /* handle trailing '/' on dirs ! */
        *dst = 0;
    }
    else
      break;
  }

  for ( src = start; *src != 0; ++src )
    if ( (strchr(invalid, *src) != NULL) ||
         ((*src == ' ') && !sflag) )  /* allow spaces if user wants */
        *src = '_';
}


int IsFileNameValid(char *name)
{
  HFILE hf;
#ifdef __32BIT__
  ULONG uAction;
#else
  USHORT uAction;
#endif

  switch( DosOpen(name, &hf, &uAction, 0, 0, FILE_OPEN,
                  OPEN_ACCESS_READONLY | OPEN_SHARE_DENYNONE, 0) )
  {
  case ERROR_INVALID_NAME:
  case ERROR_FILENAME_EXCED_RANGE:
    return FALSE;
  case NO_ERROR:
    DosClose(hf);
  default:
    return TRUE;
  }
}


typedef struct
{
  ULONG cbList;               /* length of value + 22 */
#ifdef __32BIT__
  ULONG oNext;
#endif
  BYTE fEA;                   /* 0 */
  BYTE cbName;                /* length of ".LONGNAME" = 9 */
  USHORT cbValue;             /* length of value + 4 */
  BYTE szName[10];            /* ".LONGNAME" */
  USHORT eaType;              /* 0xFFFD for length-preceded ASCII */
  USHORT eaSize;              /* length of value */
  BYTE szValue[CCHMAXPATH];
}
FEALST;


int SetLongNameEA(char *name, char *longname)
{
  EAOP eaop;
  FEALST fealst;

#ifndef __32BIT__
  if ( _osmode == DOS_MODE )
    return 0;
#endif

  eaop.fpFEAList = (PFEALIST) &fealst;
  eaop.fpGEAList = NULL;
  eaop.oError = 0;

  strcpy(fealst.szName, ".LONGNAME");
  strcpy(fealst.szValue, longname);

  fealst.cbList  = sizeof(fealst) - CCHMAXPATH + strlen(fealst.szValue);
  fealst.cbName  = (BYTE) strlen(fealst.szName);
  fealst.cbValue = sizeof(USHORT) * 2 + strlen(fealst.szValue);

#ifdef __32BIT__
  fealst.oNext   = 0;
#endif
  fealst.fEA     = 0;
  fealst.eaType  = 0xFFFD;
  fealst.eaSize  = strlen(fealst.szValue);

  return DosSetPathInfo(name, FIL_QUERYEASIZE,
                        (PBYTE) &eaop, sizeof(eaop), 0
#ifndef __32BIT__
                       , 0
#endif
                       );
}