#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <errno.h>
#include <fcntl.h>

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

#include "unzip.h"

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

/*
  mini unzip, demo of unzip package

  usage :
  Usage : miniunz [-exvlo] file.zip [file_to_extract]

  list the file in the zipfile, and print the content of FILE_ID.ZIP or README.TXT
    if it exists
*/


/* change_file_date : change the date/time of a file
    filename : the filename of the file where date/time must be modified
    dosdate : the new date at the MSDos format (4 bytes)
    tmu_date : the SAME new date at the tm_unz format */
void change_file_date(filename,dosdate,tmu_date)
  const char *filename;
  uLong dosdate;
  tm_unz tmu_date;
{
#ifdef WIN32
  HANDLE hFile;
  FILETIME ftm,ftLocal,ftCreate,ftLastAcc,ftLastWrite;

  hFile = CreateFile(filename,GENERIC_READ | GENERIC_WRITE,
                      0,NULL,OPEN_EXISTING,0,NULL);
  GetFileTime(hFile,&ftCreate,&ftLastAcc,&ftLastWrite);
  DosDateTimeToFileTime((WORD)(dosdate>>16),(WORD)dosdate,&ftLocal);
  LocalFileTimeToFileTime(&ftLocal,&ftm);
  SetFileTime(hFile,&ftm,&ftLastAcc,&ftm);
  CloseHandle(hFile);
#else
#ifdef unix
  struct utimbuf ut;
  struct tm newdate;
  newdate.tm_sec = tmu_date.tm_sec;
  newdate.tm_min=tmu_date.tm_min;
  newdate.tm_hour=tmu_date.tm_hour;
  newdate.tm_mday=tmu_date.tm_mday;
  newdate.tm_mon=tmu_date.tm_mon;
  if (tmu_date.tm_year > 1900)
      newdate.tm_year=tmu_date.tm_year - 1900;
  else
      newdate.tm_year=tmu_date.tm_year ;
  newdate.tm_isdst=-1;

  ut.actime=ut.modtime=mktime(&newdate);
  utime(filename,&ut);
#endif
#endif
}


/* mymkdir and change_file_date are not 100 % portable
   As I don't know well Unix, I wait feedback for the unix portion */

int mymkdir(dirname)
  const char* dirname;
{
    int ret=0;
#ifdef WIN32
  ret = mkdir(dirname);
#else
#ifdef unix
  ret = mkdir (dirname,0775);
#endif
#endif
  return ret;
}

int makedir (newdir)
    char *newdir;
{
  char *buffer ;
  char *p;
  int  len = strlen(newdir);

  if (len <= 0)
    return 0;

  buffer = (char*)malloc(len+1);
  strcpy(buffer,newdir);

  if (buffer[len-1] == '/') {
    buffer[len-1] = '\0';
  }
  if (mymkdir(buffer) == 0)
    {
      free(buffer);
      return 1;
    }

  p = buffer+1;
  while (1)
    {
      char hold;

      while(*p && *p != '\\' && *p != '/')
        p++;
      hold = *p;
      *p = 0;
      if ((mymkdir(buffer) == -1) && (errno == ENOENT))
        {
          printf("couldn't create directory %s\n",buffer);
          free(buffer);
          return 0;
        }
      if (hold == 0)
        break;
      *p++ = hold;
    }
  free(buffer);
  return 1;
}

void do_banner()
{
  printf("MiniUnz 0.15, demo of zLib + Unz package written by Gilles Vollant\n");
  printf("more info at http://wwww.winimage/zLibDll/unzip.htm\n\n");
}

void do_help()
{
  printf("Usage : miniunz [-exvlo] file.zip [file_to_extract]\n\n") ;
}


int do_list(uf)
  unzFile uf;
{
  uLong i;
  unz_global_info gi;
  int err;

  err = unzGetGlobalInfo (uf,&gi);
  if (err!=UNZ_OK)
    printf("error %d with zipfile in unzGetGlobalInfo \n",err);
    printf(" Length  Method   Size  Ratio   Date    Time   CRC-32     Name\n");
    printf(" ------  ------   ----  -----   ----    ----   ------     ----\n");
  for (i=0;i<gi.number_entry;i++)
  {
    char filename_inzip[256];
    unz_file_info file_info;
    uLong ratio=0;
    const char *string_method;
    err = unzGetCurrentFileInfo(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);
    if (err!=UNZ_OK)
    {
      printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
      break;
    }
    if (file_info.uncompressed_size>0)
      ratio = (file_info.compressed_size*100)/file_info.uncompressed_size;

    if (file_info.compression_method==0)
      string_method="Stored";
    else
    if (file_info.compression_method==Z_DEFLATED)
    {
      uInt iLevel=(uInt)((file_info.flag & 0x6)/2);
      if (iLevel==0)
        string_method="Defl:N";
      else if (iLevel==1)
        string_method="Defl:X";
      else if ((iLevel==2) || (iLevel==3))
        string_method="Defl:F"; /* 2:fast , 3 : extra fast*/
    }
    else
      string_method="Unkn. ";

    printf("%7lu  %6s %7lu %3lu%%  %2.2lu-%2.2lu-%2.2lu  %2.2lu:%2.2lu  %8.8lx   %s\n",
          file_info.uncompressed_size,string_method,file_info.compressed_size,
        ratio,
        (uLong)file_info.tmu_date.tm_mon + 1,
                (uLong)file_info.tmu_date.tm_mday,
        (uLong)file_info.tmu_date.tm_year % 100,
        (uLong)file_info.tmu_date.tm_hour,(uLong)file_info.tmu_date.tm_min,
        (uLong)file_info.crc,filename_inzip);
    if ((i+1)<gi.number_entry)
    {
      err = unzGoToNextFile(uf);
      if (err!=UNZ_OK)
      {
        printf("error %d with zipfile in unzGoToNextFile\n",err);
        break;
      }
    }
  }

  return 0;
}


int do_extract_currentfile(uf,popt_extract_without_path,popt_overwrite)
  unzFile uf;
  const int* popt_extract_without_path;
    int* popt_overwrite;
{
  char filename_inzip[256];
  char* filename_withoutpath;
  char* p;
    int err=UNZ_OK;
    FILE *fout=NULL;
    void* buf;
    uInt size_buf;

  unz_file_info file_info;
  uLong ratio=0;
  err = unzGetCurrentFileInfo(uf,&file_info,filename_inzip,sizeof(filename_inzip),NULL,0,NULL,0);

  if (err!=UNZ_OK)
  {
    printf("error %d with zipfile in unzGetCurrentFileInfo\n",err);
    return err;
  }

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

  p = filename_withoutpath = filename_inzip;
  while ((*p) != '\0')
  {
    if (((*p)=='/') || ((*p)=='\\'))
      filename_withoutpath = p+1;
    p++;
  }

  if ((*filename_withoutpath)=='\0')
  {
    if ((*popt_extract_without_path)==0)
    {
      printf("creating directory: %s\n",filename_inzip);
      mymkdir(filename_inzip);
    }
  }
  else
  {
    const char* write_filename;
    int skip=0;

    if ((*popt_extract_without_path)==0)
      write_filename = filename_inzip;
    else
      write_filename = filename_withoutpath;

    err = unzOpenCurrentFile(uf);
    if (err!=UNZ_OK)
    {
      printf("error %d with zipfile in unzOpenCurrentFile\n",err);
    }

    if (((*popt_overwrite)==0) && (err==UNZ_OK))
    {
      char rep;
      FILE* ftestexist;
      ftestexist = fopen(write_filename,"rb");
      if (ftestexist!=NULL)
      {
        fclose(ftestexist);
        do
        {
          char answer[128];
          printf("The file %s exist. Overwrite ? [y]es, [n]o, [A]ll: ",write_filename);
          scanf("%1s",answer);
          rep = answer[0] ;
          if ((rep>='a') && (rep<='z'))
            rep -= 0x20;
        }
        while ((rep!='Y') && (rep!='N') && (rep!='A'));
      }

      if (rep == 'N')
        skip = 1;

      if (rep == 'A')
        *popt_overwrite=1;
    }

    if ((skip==0) && (err==UNZ_OK))
    {
      fout=fopen(write_filename,"wb");

            /* some zipfile don't contain directory alone before file */
            if ((fout==NULL) && ((*popt_extract_without_path)==0) &&
                                (filename_withoutpath!=(char*)filename_inzip))
            {
                char c=*(filename_withoutpath-1);
                *(filename_withoutpath-1)='\0';
                makedir(write_filename);
                *(filename_withoutpath-1)=c;
                fout=fopen(write_filename,"wb");
            }

      if (fout==NULL)
      {
        printf("error opening %s\n",write_filename);
      }
    }

    if (fout!=NULL)
    {
      printf(" extracting: %s\n",write_filename);

      do
      {
        err = unzReadCurrentFile(uf,buf,size_buf);
        if (err<0)
        {
          printf("error %d with zipfile in unzReadCurrentFile\n",err);
          break;
        }
        if (err>0)
          if (fwrite(buf,err,1,fout)!=1)
          {
            printf("error in writing extracted file\n");
                        err=UNZ_ERRNO;
            break;
          }
      }
      while (err>0);
      fclose(fout);
      if (err==0)
        change_file_date(write_filename,file_info.dosDate,
                       file_info.tmu_date);
    }

        if (err==UNZ_OK)
        {
        err = unzCloseCurrentFile (uf);
        if (err!=UNZ_OK)
        {
          printf("error %d with zipfile in unzCloseCurrentFile\n",err);
        }
        }
        else
            unzCloseCurrentFile(uf); /* don't lose the error */
  }

    free(buf);
    return err;
}


int do_extract(uf,opt_extract_without_path,opt_overwrite)
  unzFile uf;
  int opt_extract_without_path;
    int opt_overwrite;
{
  uLong i;
  unz_global_info gi;
  int err;
  FILE* fout=NULL;

  err = unzGetGlobalInfo (uf,&gi);
  if (err!=UNZ_OK)
    printf("error %d with zipfile in unzGetGlobalInfo \n",err);

  for (i=0;i<gi.number_entry;i++)
  {
        if (do_extract_currentfile(uf,&opt_extract_without_path,
                                      &opt_overwrite) != UNZ_OK)
            break;

    if ((i+1)<gi.number_entry)
    {
      err = unzGoToNextFile(uf);
      if (err!=UNZ_OK)
      {
        printf("error %d with zipfile in unzGoToNextFile\n",err);
        break;
      }
    }
  }

  return 0;
}

int do_extract_onefile(uf,filename,opt_extract_without_path,opt_overwrite)
  unzFile uf;
  const char* filename;
  int opt_extract_without_path;
    int opt_overwrite;
{
    int err = UNZ_OK;
    if (unzLocateFile(uf,filename,CASESENSITIVITY)!=UNZ_OK)
    {
        printf("file %s not found in the zipfile\n",filename);
        return 2;
    }

    if (do_extract_currentfile(uf,&opt_extract_without_path,
                                      &opt_overwrite) == UNZ_OK)
        return 0;
    else
        return 1;
}


int main(argc,argv)
  int argc;
  char *argv[];
{
  const char *zipfilename=NULL;
    const char *filename_to_extract=NULL;
  int i;
  int opt_do_list=0;
  int opt_do_extract=1;
  int opt_do_extract_withoutpath=0;
  int opt_overwrite=0;
  char filename_try[512];
  unzFile uf=NULL;

  do_banner();
  if (argc==1)
  {
    do_help();
    exit(0);
  }
  else
  {
    for (i=1;i<argc;i++)
    {
      if ((*argv[i])=='-')
      {
        const char *p=argv[i]+1;

        while ((*p)!='\0')
        {
          char c=*(p++);;
          if ((c=='l') || (c=='L'))
            opt_do_list = 1;
          if ((c=='v') || (c=='V'))
            opt_do_list = 1;
          if ((c=='x') || (c=='X'))
            opt_do_extract = 1;
          if ((c=='e') || (c=='E'))
            opt_do_extract = opt_do_extract_withoutpath = 1;
          if ((c=='o') || (c=='O'))
            opt_overwrite=1;
        }
      }
      else
            {
        if (zipfilename == NULL)
          zipfilename = argv[i];
                else if (filename_to_extract==NULL)
                        filename_to_extract = argv[i] ;
            }
    }
  }

  if (zipfilename!=NULL)
  {
    strcpy(filename_try,zipfilename);
    uf = unzOpen(zipfilename);
    if (uf==NULL)
    {
      strcat(filename_try,".zip");
      uf = unzOpen(filename_try);
    }
  }

  if (uf==NULL)
  {
    printf("Cannot open %s or %s.zip\n",zipfilename,zipfilename);
    exit (1);
  }
    printf("%s opened\n",filename_try);

  if (opt_do_list==1)
    return do_list(uf);
  else if (opt_do_extract==1)
    {
        if (filename_to_extract == NULL)
        return do_extract(uf,opt_do_extract_withoutpath,opt_overwrite);
        else
            return do_extract_onefile(uf,filename_to_extract,
                                      opt_do_extract_withoutpath,opt_overwrite);
    }
  unzCloseCurrentFile(uf);

  return 0;  /* to avoid warning */
}
