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dsZipMmap.h

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/*
 * $Id: dsZipMmap.h,v 1.3 2003/09/10 16:01:40 dsamersoff Exp $
 */
#ifndef dsZipMmap_h
#define dsZipMmap_h

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <time.h>

#include <zlib.h>
#include <zconf.h>


#include <dsMmap.h>
#include <dsutil.h>

DECLARE_EXCEPTION(dsZipMmap);

#define ZIP_HEADER_SIZE     30
#define ZIP_NAMELEN(pptr) (*(short *)((pptr) + 26))

typedef struct tagLocal_header
{
  int   sign;     /* local file header signature     4 bytes  (0x04034b50) */
  short nver;     /* version needed to extract       2 bytes*/  
  short flag;     /* general purpose bit flag        2 bytes*/
  short method;   /* compression method              2 bytes*/
  short lmtime;   /* last mod file time              2 bytes*/
  short lmdate;   /* last mod file date              2 bytes*/
  int   crc32;    /* crc-32                          4 bytes*/
  int   csize;    /* compressed size                 4 bytes*/
  int   usize;    /* uncompressed size               4 bytes*/
  short  namelen; /* filename length                 2 bytes*/
  short  extralen;/* extra field length              2 bytes*/
                  /* Total length:                  30 bytes*/   
} local_header;

/* Zip end of central directory header */
typedef struct tagEOCD 
{
 unsigned sign;        /*end of central dir signature         4 bytes (0x06054b50)*/
 short    this_disk;   /*number of this disk                  2 bytes*/
 short    first_disk;  /*number of the disk with the start of the cd 2 bytes*/
 short    entires;     /*total number of entries in the cd    2 bytes*/
 short    ondisik_ents;/*total number of entries in the cd    2 bytes*/
 int      cd_size;     /*size of the central directory        4 bytes*/
 int      cd_offs;     /*offset of start of central directory 4 bytes*/
 short    comment_len; /*zipfile comment length               2 bytes*/
} endof_cd;


/* gzip flag byte */
#define GZ_ASCII G     0x01 /* bit 0 set: file probably ascii text */
#define GZ_MULTIPART   0x02 /* bit 1 set: header CRC present */
#define GZ_EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
#define GZ_NAME        0x08 /* bit 3 set: original file name present */
#define GZ_COMMENT     0x10 /* bit 4 set: file comment present */
#define GZ_ENCRYPT     0x20 /* bit 5 set: file encripted */
#define GZ_RESERVED    0xE0 /* bits 5..7: reserved */

/************ End of oficial part ********************/

/* path:
   /arcdir/arcname.zip/dir/file
 */

enum{ AM_ZIP, AM_GZ, AM_PLAIN };

struct ZIPFILE
{
  char * name;
  size_t phdr;
  size_t next_ptr;  
 
  ZIPFILE(){ reset(); } 
  void reset(){ next_ptr = 0; }
};

class dsZipMmap: public dsMmapAnon 
{
   int _arcmode;
   dsMmap *_srcMap;
   local_header _zipfh;

protected:
   void zipReadFile(char *ptr);
   void gzRead();

public:
   dsZipMmap(const char *path, const mode_t openmode = 0444, const int flags = 0, const int advize = MADV_NORMAL);
  ~dsZipMmap()
    { 
      if (_srcMap) delete _srcMap; 
    }


  dsMmap *src(){ return _srcMap; } 
  int type(){ return _arcmode; } 

  ZIPFILE *zipList(ZIPFILE *zf);

  int zipSeek(char *file);
  int zipSeek(size_t offs){ zipReadFile( ((char *) *_srcMap) + offs ); return 0; }
  int zipSeek(ZIPFILE *zf){ return zipSeek(zf->phdr); }

  void zipPack(char *buf, local_header * fi);
};


#endif

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