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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Samir Gehani <sgehani@netscape.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */


/*----------------------------------------------------------------------*
 *   Implements a simple AppleSingle decoder, as described in RFC1740 
 *   http://andrew2.andrew.cmu.edu/rfc/rfc1740.html
 *----------------------------------------------------------------------*/

#pragma options align=mac68k

#ifndef _NS_APPLESINGLEDECODER_H_
#define _NS_APPLESINGLEDECODER_H_

#include <stdlib.h>
#include <string.h>
#include <Carbon/Carbon.h>


/*----------------------------------------------------------------------*
 *   Struct definitions from RFC1740
 *----------------------------------------------------------------------*/
#define APPLESINGLE_MAGIC   0x00051600L
#define APPLESINGLE_VERSION 0x00020000L

typedef struct ASHeader /* header portion of AppleSingle */ 
{
  /* AppleSingle = 0x00051600; AppleDouble = 0x00051607 */
  UInt32 magicNum;      /* internal file type tag */ 
  UInt32 versionNum;    /* format version: 2 = 0x00020000 */ 
  UInt8 filler[16];     /* filler, currently all bits 0 */ 
  UInt16 numEntries;    /* number of entries which follow */
} ASHeader ; /* ASHeader */ 

typedef struct ASEntry /* one AppleSingle entry descriptor */ 
{
  UInt32 entryID;     /* entry type: see list, 0 invalid */
  UInt32 entryOffset; /* offset, in octets, from beginning */
                      /* of file to this entry's data */
  UInt32 entryLength; /* length of data in octets */
} ASEntry; /* ASEntry */

typedef struct ASFinderInfo
{
  FInfo ioFlFndrInfo;     /* PBGetFileInfo() or PBGetCatInfo() */
  FXInfo ioFlXFndrInfo;   /* PBGetCatInfo() (HFS only) */
} ASFinderInfo; /* ASFinderInfo */

typedef struct ASMacInfo  /* entry ID 10, Macintosh file information */
{
       UInt8 filler[3];   /* filler, currently all bits 0 */ 
       UInt8 ioFlAttrib;  /* PBGetFileInfo() or PBGetCatInfo() */
} ASMacInfo;

typedef struct ASFileDates  /* entry ID 8, file dates info */
{
  SInt32 create; /* file creation date/time */
  SInt32 modify; /* last modification date/time */
  SInt32 backup; /* last backup date/time */
  SInt32 access; /* last access date/time */
} ASFileDates; /* ASFileDates */

/* entryID list */
#define AS_DATA         1 /* data fork */
#define AS_RESOURCE     2 /* resource fork */
#define AS_REALNAME     3 /* File's name on home file system */
#define AS_COMMENT      4 /* standard Mac comment */
#define AS_ICONBW       5 /* Mac black & white icon */
#define AS_ICONCOLOR    6 /* Mac color icon */
/*                      7    not used */
#define AS_FILEDATES    8 /* file dates; create, modify, etc */
#define AS_FINDERINFO   9 /* Mac Finder info & extended info */
#define AS_MACINFO      10 /* Mac file info, attributes, etc */
#define AS_PRODOSINFO   11 /* Pro-DOS file info, attrib., etc */
#define AS_MSDOSINFO    12 /* MS-DOS file info, attributes, etc */
#define AS_AFPNAME      13 /* Short name on AFP server */
#define AS_AFPINFO      14 /* AFP file info, attrib., etc */

#define AS_AFPDIRID     15 /* AFP directory ID */


/*----------------------------------------------------------------------*
 *   Macros
 *----------------------------------------------------------------------*/
#define MAC_ERR_CHECK(_funcCall)   \
  err = _funcCall;         \
  if (err!=noErr)         \
      return err;
  
  

class nsAppleSingleDecoder 
{

public:
  nsAppleSingleDecoder(const FSRef *inRef, FSRef *outRef);
  nsAppleSingleDecoder();
  ~nsAppleSingleDecoder();
    
  /** 
   * Decode
   *
   * Takes an "in" FSSpec for the source file in AppleSingle
   * format to decode and write out to an "out" FSSpec.
   * This form is used when the Decode(void) method has already
   * been invoked once and this object is reused to decode 
   * another AppleSingled file: useful in iteration to avoid
   * nsAppleSingleDecoder object instantiation per file.
   *
   * @param  inRef    the AppleSingled file to decode
   * @param  outRef   the destination file in which the decoded
   *                  data was written out (empty when passed in
   *                  and filled on return)
   * @return err      a standard MacOS OSErr where noErr means OK
   */
  OSErr Decode(const FSRef *inRef, FSRef *outRef);
    
  /**
   * Decode
   *
   * Decodes the AppleSingled file passed in to the constructor
   * and writes out the decoded data to the outSpec passed to the 
   * constructor.
   *
   * @return err      a standard MacOS OSErr where noErr = OK
   */
  OSErr Decode();
  
  /**
   * DecodeFolder
   *
   * Traverses arbitrarily nested subdirs decoding any files
   * in AppleSingle format and leaving other files alone.
   *
   * @param  aFolder the folder whose contents to decode
   * @return err     a standard MacOS err 
   *                 (dirNFErr if invalid dir, noErr = OK)
   */
  OSErr DecodeFolder(const FSRef *aFolder);
     
  /**
   * IsAppleSingleFile
   *
   * Checks the file header to see whether this is an AppleSingle
   * version 2 file by matching the magicNum field in the header.
   *
   * @param  inRef        the file to check
   * @return bAppleSingle a Boolean where true indicates this is
   *                      in fact an AppleSingle file
   */
  static Boolean IsAppleSingleFile(const FSRef *inRef);
  
  /**
   * IsDirectory
   *
   * Check whether the supplied FSSpec points to a directory.
   *
   * @param  inRef  the file/directory spec
   * @return bDir   true iff this spec is a valid directory
   */
  static Boolean IsDirectory(const FSRef *inRef);

  /**
   * String utility wrapper to compare to Unicode filenames.
   */
  static Boolean UCstrcmp(const HFSUniStr255 *str1, const HFSUniStr255 *str2);
  
private:
  const FSRef *mInRef;
  FSRef       *mOutRef;
  // cache since it's used through the life of one Decode cycle:
  SInt16      mInRefNum;  
  Boolean     mRenameReqd;
  
  OSErr  ProcessASEntry(ASEntry inEntry);  
  OSErr  ProcessDataFork(ASEntry inEntry);
  OSErr  ProcessResourceFork(ASEntry inEntry);
  OSErr  ProcessRealName(ASEntry inEntry);
  OSErr  ProcessFileDates(ASEntry inEntry);
  OSErr  ProcessFinderInfo(ASEntry inEntry);
  OSErr  EntryToMacFile(ASEntry inEntry, UInt16 inTargetSpecRefNum);

  OSErr  FSMakeUnique(const FSRef *inParentRef, FSRef *outRef);
};

#ifdef __cplusplus
extern "C" {
#endif

Boolean 
DecodeDirIterateFilter(Boolean containerChanged, ItemCount currentLevel,
  const FSCatalogInfo *catalogInfo, const FSRef *ref, 
  const FSSpec *spec, const HFSUniStr255 *name, void *yourDataPtr);

#ifdef __cplusplus
}
#endif

#pragma options align=reset

#endif /* _NS_APPLESINGLEDECODER_H_ */