eBookReaderSwitch/source/BLZip.cpp

/* BLZip
 *	C++ class for doing basic zip compression
 *	Scott Lawrence  yorgle@gmail.com
 *
 * This code is HEAVILY based on the "minizip" code included with zlib
 * also available here: http://www.winimage.com/zLibDll/minizip.html
 *
 * v1.0 2013-June-05 - Initial release
 */

/* This code is provided under an MIT license:

The MIT License (MIT)

Copyright (c) 2013 Scott Lawrence

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

*/


#include <iostream>

extern "C"
{
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>

#ifdef _WIN32
# include <direct.h>
# include <io.h>
#else
# include <unistd.h>
# include <utime.h>
#endif


#include "minizip/zip.h"
#include "minizip/unzip.h"

#define CASESENSITIVITY (0)
#define WRITEBUFFERSIZE (8192)
#define MAXFILENAME (256)

#ifdef _WIN32
#define USEWIN32IOAPI
#include "minizip/iowin32.h"
#endif
}

#include "BLZip.h"


BLZip::BLZip( std::string _filename )
	: filename( _filename )
	, valid( false )
{
	// make sure it exists
	//if( !ZipFileExists( (char *) _filename.c_str() )) return;

	// open it
	this->zf = this->Open( _filename ); //, ZipFlag_Append );
	if( !this->zf ) return;

	// we're AOK
	valid = true;
}

void BLZip::Close( void )
{
	zipClose( this->zf, NULL );
	this->zf = NULL;
	this->valid = false;
}


#if (!defined(_WIN32)) && (!defined(WIN32)) && (!defined(__APPLE__))
        #ifndef __USE_FILE_OFFSET64
                #define __USE_FILE_OFFSET64
        #endif
        #ifndef __USE_LARGEFILE64
                #define __USE_LARGEFILE64
        #endif
        #ifndef _LARGEFILE64_SOURCE
                #define _LARGEFILE64_SOURCE
        #endif
        #ifndef _FILE_OFFSET_BIT
                #define _FILE_OFFSET_BIT 64
        #endif
#endif

#ifdef __APPLE__
// In darwin and perhaps other BSD variants off_t is a 64 bit value, hence no need for specific 64 bit functions
#define FOPEN_FUNC(filename, mode) fopen(filename, mode)
#define FTELLO_FUNC(stream) ftello(stream)
#define FSEEKO_FUNC(stream, offset, origin) fseeko(stream, offset, origin)
#else
#define FOPEN_FUNC(filename, mode) fopen64(filename, mode)
#define FTELLO_FUNC(stream) ftello64(stream)
#define FSEEKO_FUNC(stream, offset, origin) fseeko64(stream, offset, origin)
#endif

/* calculate the CRC32 of a file,
   because to encrypt a file, we need known the CRC32 of the file before */
int getFileCrc(const char* filenameinzip,void*buf,unsigned long size_buf,unsigned long* result_crc)
{
   unsigned long calculate_crc=0;
   int err=ZIP_OK;
   FILE * fin = FOPEN_FUNC(filenameinzip,"rb");

   unsigned long size_read = 0;
   unsigned long total_read = 0;
   if (fin==NULL)
   {   
       err = ZIP_ERRNO;
   }

    if (err == ZIP_OK)
        do
        {   
            err = ZIP_OK;
            size_read = (int)fread(buf,1,size_buf,fin);
            if (size_read < size_buf)
                if (feof(fin)==0)
            {   
                printf("error in reading %s\n",filenameinzip);
                err = ZIP_ERRNO;
            }

            if (size_read>0)
                calculate_crc = crc32(calculate_crc,(const Bytef *)buf,size_read);
            total_read += size_read;

        } while ((err == ZIP_OK) && (size_read>0));

    if (fin)
        fclose(fin);

    *result_crc=calculate_crc;
    return err;
}

int isLargeFile(const char* filename)
{
  int largeFile = 0;
  ZPOS64_T pos = 0;
  FILE* pFile = FOPEN_FUNC(filename, "rb");

  if(pFile != NULL)
  {
    int n = FSEEKO_FUNC(pFile, 0, SEEK_END);
    pos = FTELLO_FUNC(pFile);

    if(pos >= 0xffffffff)
     largeFile = 1;

                fclose(pFile);
  }

 return largeFile;
}


zipFile BLZip::Open( std::string zipfilename )
{
        zipFile zf = NULL;
        int fileExists = 0; /*check_exist_file( zipfilename.c_str() ); */
        int creat = 0;
        int err = ZIP_OK;
	int flags = ZipFlag_Overwrite;

        /* open the zip file for output */
        if( fileExists ) {
                creat = (flags & ZipFlag_Overwrite)?  APPEND_STATUS_CREATE : APPEND_STATUS_ADDINZIP;
        } else {
                creat = APPEND_STATUS_CREATE;
        }
        zf = zipOpen64( zipfilename.c_str(), creat );
        if ( err != ZIP_OK ) return zf;

        return zf;
}

BLZip::~BLZip( void )
{
	this->Close();
}



int BLZip::Add( std::string contentPath, std::string zipPath, int flags )
{
        int compressLevel = 0;
        int zip64 = 0;
        char * password = NULL;
        zip_fileinfo zi;
        FILE * fin = NULL;
        int size_read;
        int size_buf=0;
        void* buf=NULL;
        int err;
        unsigned long crcFile=0;

        if( !this->zf ) return ZIP_PARAMERROR;

        size_buf = WRITEBUFFERSIZE;
        buf = (void*)malloc(size_buf);
        if (buf==NULL)
        {
                printf("Error allocating memory\n");
                return ZIP_INTERNALERROR;
        }

	if( !zipPath.compare( "" ) ) {
		zipPath.assign( contentPath );
	}

        if( flags & ZipFlag_Faster ) compressLevel = 1;
        if( flags & ZipFlag_Better ) compressLevel = 9;

        err = getFileCrc( contentPath.c_str(), buf, size_buf, &crcFile );
        zip64 = isLargeFile( contentPath.c_str() );

        err = zipOpenNewFileInZip3_64(this->zf,zipPath.c_str(),&zi,
                         NULL,0,NULL,0,NULL /* comment*/,
                         (compressLevel != 0) ? Z_DEFLATED : 0,
                         compressLevel,0,
                         /* -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY, */
                         -MAX_WBITS, DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY,
                         password,crcFile, zip64);

        if (err != ZIP_OK)
            printf("error in opening %s in zipfile\n", contentPath.c_str() );
        else
        {   
            fin = FOPEN_FUNC( (char *)contentPath.c_str(), "rb" );
            if (fin==NULL)
            {   
                err=ZIP_ERRNO;
                printf("error in opening %s for reading\n", contentPath.c_str());
            }
        }

        if (err == ZIP_OK)
            do
            {   
                err = ZIP_OK;
                size_read = (int)fread(buf,1,size_buf,fin);
                if (size_read < size_buf)
                    if (feof(fin)==0)
                {   
                    printf("error in reading %s\n", contentPath.c_str() );
                    err = ZIP_ERRNO;
                }

                if (size_read>0)
                {   
                    err = zipWriteInFileInZip (this->zf,buf,size_read);
                    if (err<0)
                    {   
                        printf("error in writing %s in the zipfile\n", contentPath.c_str() );
                    }

                }
            } while ((err == ZIP_OK) && (size_read>0));

        if (fin)
            fclose(fin);

        /* and close the file */
        if( err == ZIP_OK ) {
                err = zipCloseFileInZip(this->zf);
        }

        free( buf );

        return ZIP_OK;
}