/* unzip.c -- IO on .zip files using zlib 

   Version 0.15 beta, Mar 19th, 1998,

   Read unzip.h for more info

*/

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "zlib.h"

#include "unzip.h"

#define __PHYSICSFS_INTERNAL__

#include "physfs_internal.h"

#if (!defined PHYSFS_SUPPORTS_ZIP)

#error PHYSFS_SUPPORTS_ZIP must be defined.

#endif

#ifdef STDC

#  include <stddef.h>

#  include <string.h>

#  include <stdlib.h>

#endif

#ifdef NO_ERRNO_H

    extern int errno;

#else

#   include <errno.h>

#endif

#ifndef local

#  define local static

#endif

/* compile with -Dlocal if your debugger can't find static symbols */

#if !defined(unix) && !defined(CASESENSITIVITYDEFAULT_YES) && \

                      !defined(CASESENSITIVITYDEFAULT_NO)

#define CASESENSITIVITYDEFAULT_NO

#endif

#ifndef UNZ_BUFSIZE

#define UNZ_BUFSIZE (16384)

#endif

#ifndef UNZ_MAXFILENAMEINZIP

#define UNZ_MAXFILENAMEINZIP (256)

#endif

#ifndef ALLOC

# define ALLOC(size) (malloc(size))

#endif

#ifndef TRYFREE

# define TRYFREE(p) {if (p) free(p);}

#endif

#define SIZECENTRALDIRITEM (0x2e)

#define SIZEZIPLOCALHEADER (0x1e)

/* I've found an old Unix (a SunOS 4.1.3_U1) without all SEEK_* defined.... */

#ifndef SEEK_CUR

#define SEEK_CUR    1

#endif

#ifndef SEEK_END

#define SEEK_END    2

#endif

#ifndef SEEK_SET

#define SEEK_SET    0

#endif

const char unz_copyright[] =

   " unzip 0.15 Copyright 1998 Gilles Vollant ";

/* unz_file_info_interntal contain internal info about a file in zipfile*/

typedef struct unz_file_info_internal_s

{

    uLong offset_curfile;/* relative offset of local header 4 bytes */

} unz_file_info_internal;

/* file_in_zip_read_info_s contain internal information about a file in zipfile,

    when reading and decompress it */

typedef struct

{

	char  *read_buffer;         /* internal buffer for compressed data */

	z_stream stream;            /* zLib stream structure for inflate */

	uLong pos_in_zipfile;       /* position in byte on the zipfile, for seek*/

	uLong stream_initialised;   /* flag set if stream structure is initialised*/

	uLong offset_local_extrafield;/* offset of the local extra field */

	uInt  size_local_extrafield;/* size of the local extra field */

	uLong pos_local_extrafield;   /* position in the local extra field in read*/

	uLong crc32;                /* crc32 of all data uncompressed */

	uLong crc32_wait;           /* crc32 we must obtain after decompress all */

	uLong rest_read_compressed; /* number of byte to be decompressed */

	uLong rest_read_uncompressed;/*number of byte to be obtained after decomp*/

	void* file;                 /* io structore of the zipfile */

	uLong compression_method;   /* compression method (0==store) */

	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/

} file_in_zip_read_info_s;

/* unz_s contain internal information about the zipfile

*/

typedef struct

{

	void* file;                 /* io structore of the zipfile */

	unz_global_info gi;       /* public global information */

	uLong byte_before_the_zipfile;/* byte before the zipfile, (>0 for sfx)*/

	uLong num_file;             /* number of the current file in the zipfile*/

	uLong pos_in_central_dir;   /* pos of the current file in the central dir*/

	uLong current_file_ok;      /* flag about the usability of the current file*/

	uLong central_pos;          /* position of the beginning of the central dir*/

	uLong size_central_dir;     /* size of the central directory  */

	uLong offset_central_dir;   /* offset of start of central directory with

								   respect to the starting disk number */

	unz_file_info cur_file_info; /* public info about the current file in zip*/

	unz_file_info_internal cur_file_info_internal; /* private info about it*/

    file_in_zip_read_info_s* pfile_in_zip_read; /* structure about the current

	                                    file if we are decompressing it */

} unz_s;

/* ===========================================================================

     Read a byte from a gz_stream; update next_in and avail_in. Return EOF

   for end of file.

   IN assertion: the stream s has been sucessfully opened for reading.

*/

local int unzlocal_getByte(fin,pi)

	void *fin;

	int *pi;

{

    PHYSFS_uint8 c;

	PHYSFS_sint64 err = __PHYSFS_platformRead(fin, &c, 1, 1);

    if (err==1)

    {

        *pi = (int)c;

        return UNZ_OK;

    }

    else

    {

            return UNZ_ERRNO;

    }

}

/* !!! FIXME: Use PhysFS byteswap routines. */

/* ===========================================================================

   Reads a long in LSB order from the given gz_stream. Sets 

*/

local int unzlocal_getShort (fin,pX)

	void* fin;

    uLong *pX;

{

    uLong x ;

    int i;

    int err;

    err = unzlocal_getByte(fin,&i);

    x = (uLong)i;

    if (err==UNZ_OK)

        err = unzlocal_getByte(fin,&i);

    x += ((uLong)i)<<8;

    if (err==UNZ_OK)

        *pX = x;

    else

        *pX = 0;

    return err;

}

/* !!! FIXME: Use PhysFS byteswap routines. */

local int unzlocal_getLong (fin,pX)

	void* fin;

    uLong *pX;

{

    uLong x ;

    int i;

    int err;

    err = unzlocal_getByte(fin,&i);

    x = (uLong)i;

    if (err==UNZ_OK)

        err = unzlocal_getByte(fin,&i);

    x += ((uLong)i)<<8;

    if (err==UNZ_OK)

        err = unzlocal_getByte(fin,&i);

    x += ((uLong)i)<<16;

    if (err==UNZ_OK)

        err = unzlocal_getByte(fin,&i);

    x += ((uLong)i)<<24;

    if (err==UNZ_OK)

        *pX = x;

    else

        *pX = 0;

    return err;

}

/* My own strcmpi / strcasecmp */

local int strcmpcasenosensitive_internal (fileName1,fileName2)

	const char* fileName1;

	const char* fileName2;

{

	for (;;)

	{

		char c1=*(fileName1++);

		char c2=*(fileName2++);

		if ((c1>='a') && (c1<='z'))

			c1 -= 0x20;

		if ((c2>='a') && (c2<='z'))

			c2 -= 0x20;

		if (c1=='\0')

			return ((c2=='\0') ? 0 : -1);

		if (c2=='\0')

			return 1;

		if (c1<c2)

			return -1;

		if (c1>c2)

			return 1;

	}

}

#ifdef  CASESENSITIVITYDEFAULT_NO

#define CASESENSITIVITYDEFAULTVALUE 2

#else

#define CASESENSITIVITYDEFAULTVALUE 1

#endif

#ifndef STRCMPCASENOSENTIVEFUNCTION

#define STRCMPCASENOSENTIVEFUNCTION strcmpcasenosensitive_internal

#endif

/* 

   Compare two filename (fileName1,fileName2).

   If iCaseSenisivity = 1, comparision is case sensitivity (like strcmp)

   If iCaseSenisivity = 2, comparision is not case sensitivity (like strcmpi

                                                                or strcasecmp)

   If iCaseSenisivity = 0, case sensitivity is defaut of your operating system

        (like 1 on Unix, 2 on Windows)

*/

extern int ZEXPORT unzStringFileNameCompare (fileName1,fileName2,iCaseSensitivity)

	const char* fileName1;

	const char* fileName2;

	int iCaseSensitivity;

{

	if (iCaseSensitivity==0)

		iCaseSensitivity=CASESENSITIVITYDEFAULTVALUE;

	if (iCaseSensitivity==1)

		return strcmp(fileName1,fileName2);

	return STRCMPCASENOSENTIVEFUNCTION(fileName1,fileName2);

} 

#define BUFREADCOMMENT (0x400)

/*

  Locate the Central directory of a zipfile (at the end, just before

    the global comment)

*/

local uLong unzlocal_SearchCentralDir(fin)

	void *fin;

{

	unsigned char* buf;

	uLong uSizeFile;

	uLong uBackRead;

	uLong uMaxBack=0xffff; /* maximum size of global comment */

	uLong uPosFound=0;

	uSizeFile = (uLong) __PHYSFS_platformFileLength( fin );

	if (uMaxBack>uSizeFile)

		uMaxBack = uSizeFile;

	buf = (unsigned char*)ALLOC(BUFREADCOMMENT+4);

	if (buf==NULL)

		return 0;

	uBackRead = 4;

	while (uBackRead<uMaxBack)

	{

		uLong uReadSize,uReadPos ;

		int i;

		if (uBackRead+BUFREADCOMMENT>uMaxBack) 

			uBackRead = uMaxBack;

		else

			uBackRead+=BUFREADCOMMENT;

		uReadPos = uSizeFile-uBackRead ;

		uReadSize = ((BUFREADCOMMENT+4) < (uSizeFile-uReadPos)) ? 

                     (BUFREADCOMMENT+4) : (uSizeFile-uReadPos);

		if (!__PHYSFS_platformSeek(fin,uReadPos))

			break;

		if (__PHYSFS_platformRead(fin,buf,(uInt)uReadSize,1)!=1)

			break;

		for (i=(int)uReadSize-3; (i--)>0;)

		{

			if (((*(buf+i))==0x50) && ((*(buf+i+1))==0x4b) &&

				((*(buf+i+2))==0x05) && ((*(buf+i+3))==0x06))

			{

				uPosFound = uReadPos+i;

				break;

			}

		}

		if (uPosFound!=0)

			break;

	}

	TRYFREE(buf);

	return uPosFound;

}

/*

  Open a Zip file. path contain the full pathname (by example,

     on a Windows NT computer "c:\\test\\zlib109.zip" or on an Unix computer

	 "zlib/zlib109.zip".

	 If the zipfile cannot be opened (file don't exist or in not valid), the

	   return value is NULL.

     Else, the return value is a unzFile Handle, usable with other function

	   of this unzip package.

*/

extern unzFile ZEXPORT unzOpen (path)

	const char *path;

{

	unz_s us;

	unz_s *s;

	uLong central_pos,uL;

	void* fin ;

	uLong number_disk;          /* number of the current dist, used for 

								   spaning ZIP, unsupported, always 0*/

	uLong number_disk_with_CD;  /* number the the disk with central dir, used

								   for spaning ZIP, unsupported, always 0*/

	uLong number_entry_CD;      /* total number of entries in

	                               the central dir 

	                               (same than number_entry on nospan) */

	int err=UNZ_OK;

    if (unz_copyright[0]!=' ')

        return NULL;

    fin=__PHYSFS_platformOpenRead(path);

	if (fin==NULL)

		return NULL;

	central_pos = unzlocal_SearchCentralDir(fin);

	if (central_pos==0)

		err=UNZ_ERRNO;

	if (!__PHYSFS_platformSeek(fin,central_pos))

		err=UNZ_ERRNO;

	/* the signature, already checked */

	if (unzlocal_getLong(fin,&uL)!=UNZ_OK)

		err=UNZ_ERRNO;

	/* number of this disk */

	if (unzlocal_getShort(fin,&number_disk)!=UNZ_OK)

		err=UNZ_ERRNO;

	/* number of the disk with the start of the central directory */

	if (unzlocal_getShort(fin,&number_disk_with_CD)!=UNZ_OK)

		err=UNZ_ERRNO;

	/* total number of entries in the central dir on this disk */

	if (unzlocal_getShort(fin,&us.gi.number_entry)!=UNZ_OK)

		err=UNZ_ERRNO;

	/* total number of entries in the central dir */

	if (unzlocal_getShort(fin,&number_entry_CD)!=UNZ_OK)

		err=UNZ_ERRNO;

	if ((number_entry_CD!=us.gi.number_entry) ||

		(number_disk_with_CD!=0) ||

		(number_disk!=0))

		err=UNZ_BADZIPFILE;

	/* size of the central directory */

	if (unzlocal_getLong(fin,&us.size_central_dir)!=UNZ_OK)

		err=UNZ_ERRNO;

	/* offset of start of central directory with respect to the 

	      starting disk number */

	if (unzlocal_getLong(fin,&us.offset_central_dir)!=UNZ_OK)

		err=UNZ_ERRNO;

	/* zipfile comment length */

	if (unzlocal_getShort(fin,&us.gi.size_comment)!=UNZ_OK)

		err=UNZ_ERRNO;

	if ((central_pos<us.offset_central_dir+us.size_central_dir) && 

		(err==UNZ_OK))

		err=UNZ_BADZIPFILE;

	if (err!=UNZ_OK)

	{

		__PHYSFS_platformClose(fin);

		return NULL;

	}

	us.file=fin;

	us.byte_before_the_zipfile = central_pos -

		                    (us.offset_central_dir+us.size_central_dir);

	us.central_pos = central_pos;

    us.pfile_in_zip_read = NULL;

	s=(unz_s*)ALLOC(sizeof(unz_s));

	*s=us;

	unzGoToFirstFile((unzFile)s);	

	return (unzFile)s;	

}

/*

  Close a ZipFile opened with unzipOpen.

  If there is files inside the .Zip opened with unzipOpenCurrentFile (see later),

    these files MUST be closed with unzipCloseCurrentFile before call unzipClose.

  return UNZ_OK if there is no problem. */

extern int ZEXPORT unzClose (file)

	unzFile file;

{

	unz_s* s;

	if (file==NULL)

		return UNZ_PARAMERROR;

	s=(unz_s*)file;

    if (s->pfile_in_zip_read!=NULL)

        unzCloseCurrentFile(file);

	__PHYSFS_platformClose(s->file);

	TRYFREE(s);

	return UNZ_OK;

}

/*

  Write info about the ZipFile in the *pglobal_info structure.

  No preparation of the structure is needed

  return UNZ_OK if there is no problem. */

extern int ZEXPORT unzGetGlobalInfo (file,pglobal_info)

	unzFile file;

	unz_global_info *pglobal_info;

{

	unz_s* s;

	if (file==NULL)

		return UNZ_PARAMERROR;

	s=(unz_s*)file;

	*pglobal_info=s->gi;

	return UNZ_OK;

}

/*

   Translate date/time from Dos format to tm_unz (readable more easilty)

*/

local void unzlocal_DosDateToTmuDate (ulDosDate, ptm)

    uLong ulDosDate;

    tm_unz* ptm;

{

    uLong uDate;

    uDate = (uLong)(ulDosDate>>16);

    ptm->tm_mday = (uInt)(uDate&0x1f) ;

    ptm->tm_mon =  (uInt)((((uDate)&0x1E0)/0x20)-1) ;

    ptm->tm_year = (uInt)(((uDate&0x0FE00)/0x0200)+1980) ;

    ptm->tm_hour = (uInt) ((ulDosDate &0xF800)/0x800);

    ptm->tm_min =  (uInt) ((ulDosDate&0x7E0)/0x20) ;

    ptm->tm_sec =  (uInt) (2*(ulDosDate&0x1f)) ;

}

/*

  Get Info about the current file in the zipfile, with internal only info

*/

local int unzlocal_GetCurrentFileInfoInternal OF((unzFile file,

                                                  unz_file_info *pfile_info,

                                                  unz_file_info_internal 

                                                  *pfile_info_internal,

                                                  char *szFileName,

												  uLong fileNameBufferSize,

                                                  void *extraField,

												  uLong extraFieldBufferSize,

                                                  char *szComment,

												  uLong commentBufferSize));

local int unzlocal_GetCurrentFileInfoInternal (file,

                                              pfile_info,

                                              pfile_info_internal,

                                              szFileName, fileNameBufferSize,

                                              extraField, extraFieldBufferSize,

                                              szComment,  commentBufferSize)

	unzFile file;

	unz_file_info *pfile_info;

	unz_file_info_internal *pfile_info_internal;

	char *szFileName;