/*
 *	Copyright (c) 2003 Guido Draheim <guidod@gmx.de>
 *      Use freely under the restrictions of the ZLIB license.
 *
 *      This file is used as an example to clarify zzip api usage.
 */

#include <zzip/lib.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include "__mkdir.h"
#include "__string.h"
#include "__fnmatch.h"
#include "__debug.h"
#include "unzzipcat-zip.h"
#include "unzzip-states.h"

#ifdef ZZIP_HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef ZZIP_HAVE_IO_H
#include <io.h>
#endif

static int exitcode(int e)
{
    switch (e)
    {
        case ZZIP_NO_ERROR:
            return EXIT_OK;
        case ZZIP_OUTOFMEM: /* out of memory */
            return EXIT_ENOMEM;
        case ZZIP_DIR_OPEN: /* failed to open zipfile, see errno for details */
            return EXIT_ZIP_NOT_FOUND;
        case ZZIP_DIR_STAT: /* failed to fstat zipfile, see errno for details */
        case ZZIP_DIR_SEEK: /* failed to lseek zipfile, see errno for details */
        case ZZIP_DIR_READ: /* failed to read zipfile, see errno for details */
        case ZZIP_DIR_TOO_SHORT:
        case ZZIP_DIR_EDH_MISSING:
            return EXIT_FILEFORMAT;
        case ZZIP_DIRSIZE:
            return EXIT_EARLY_END_OF_FILE;
        case ZZIP_ENOENT:
            return EXIT_FILE_NOT_FOUND;
        case ZZIP_UNSUPP_COMPR:
            return EXIT_UNSUPPORTED_COMPRESSION;
        case ZZIP_CORRUPTED:
        case ZZIP_UNDEF:
        case ZZIP_DIR_LARGEFILE:
            return EXIT_FILEFORMAT;
    }
    return EXIT_ERRORS;
}

static void unzzip_cat_file(ZZIP_DIR* disk, char* name, FILE* out)
{
    ZZIP_FILE* file = zzip_file_open (disk, name, 0);
    if (file) 
    {
	char buffer[1024]; int len;
	while ((len = zzip_file_read (file, buffer, 1024))) 
	{
	    fwrite (buffer, 1, len, out);
	}
	
	zzip_file_close (file);
    }
}

/*
 * NAME: remove_dotdotslash
 * PURPOSE: To remove any "../" components from the given pathname
 * ARGUMENTS: path: path name with maybe "../" components
 * RETURNS: Nothing, "path" is modified in-place
 * NOTE: removing "../" from the path ALWAYS shortens the path, never adds to it!
 *	Also, "path" is not used after creating it.
 *	So modifying "path" in-place is safe to do.
 */
static inline void
remove_dotdotslash(char *path)
{
    /* Note: removing "../" from the path ALWAYS shortens the path, never adds to it! */
    char *dotdotslash;
    int warned = 0;

    dotdotslash = path;
    while ((dotdotslash = strstr(dotdotslash, "../")) != NULL)
    {
        /*
         * Remove only if at the beginning of the pathname ("../path/name")
         * or when preceded by a slash ("path/../name"),
         * otherwise not ("path../name..")!
         */
        if (dotdotslash == path || dotdotslash[-1] == '/')
        {
            char *src, *dst;
            if (!warned)
            {
                /* Note: the first time through the pathname is still intact */
                fprintf(stderr, "Removing \"../\" path component(s) in %s\n", path);
                warned = 1;
            }
            /* We cannot use strcpy(), as there "The strings may not overlap" */
            for (src = dotdotslash+3, dst=dotdotslash; (*dst = *src) != '\0'; src++, dst++)
                ;
        }
        else
            dotdotslash +=3;	/* skip this instance to prevent infinite loop */
    }
}

static void makedirs(const char* name)
{
      char* p = strrchr(name, '/');
      if (p) {
          char* dir_name = _zzip_strndup(name, p-name);
          makedirs(dir_name);
          free (dir_name);
      } 
      if (_zzip_mkdir(name, 0775) == -1 && errno != EEXIST)
      {
          DBG3("while mkdir %s : %s", name, strerror(errno));
      }
      errno = 0;
}

static FILE* create_fopen(char* name, char* mode, int subdirs)
{
   char *name_stripped;
   FILE *fp;
   int mustfree = 0;

   if ((name_stripped = strdup(name)) != NULL)
   {
       remove_dotdotslash(name_stripped);
       name = name_stripped;
       mustfree = 1;
   }
   if (subdirs)
   {
      char* p = strrchr(name, '/');
      if (p) {
          char* dir_name = _zzip_strndup(name, p-name);
          makedirs(dir_name); 
          free (dir_name);
      }
   }
   fp = fopen(name, mode);
   if (mustfree)
       free(name_stripped);
    return fp;
}

static int unzzip_cat (int argc, char ** argv, int extract)
{
    int done = 0;
    int argn;
    ZZIP_DIR* disk;
    zzip_error_t error;
    
    if (argc == 1)
    {
        printf (__FILE__" version "ZZIP_PACKAGE" "ZZIP_VERSION"\n");
        return EXIT_OK; /* better provide an archive argument */
    }
    
    disk = zzip_dir_open (argv[1], &error);
    if (! disk) {
	fprintf(stderr, "%s: %s\n", argv[1], zzip_strerror(error));
	return exitcode(error);
    }

    if (argc == 2)
    {  /* list all */
	ZZIP_DIRENT entry;
	while(zzip_dir_read(disk, &entry))
	{
	    char* name = entry.d_name;
	    FILE* out = stdout;
	    if (extract) out = create_fopen(name, "w", 1);
	    if (! out) {
		DBG3("fopen' %s : %s", name, strerror(errno));
	        if (errno != EISDIR) done = EXIT_ERRORS;
	        continue;
	    }
	    unzzip_cat_file (disk, name, out);
	    if (extract) fclose(out);
	}
    }
    else
    {   /* list only the matching entries - in order of zip directory */
	ZZIP_DIRENT entry;
	while(zzip_dir_read(disk, &entry))
	{
	    char* name = entry.d_name;
	    for (argn=1; argn < argc; argn++)
	    {
		if (! _zzip_fnmatch (argv[argn], name, 
		    FNM_NOESCAPE|FNM_PATHNAME|FNM_PERIOD))
	        {
	            FILE* out = stdout;
	            if (extract) out = create_fopen(name, "w", 1);
		    if (! out) {
			DBG3("fopen. %s : %s", name, strerror(errno));
		        if (errno != EISDIR) done = EXIT_ERRORS;
		        continue;
		    }
	            unzzip_cat_file (disk, name, out);
	            if (extract) fclose(out);
		    break; /* match loop */
	        }
	    }
	}
    }
    zzip_dir_close(disk);
    return done;
} 

int unzzip_print (int argc, char ** argv)
{
    return unzzip_cat(argc, argv, 0);
}

int unzzip_extract (int argc, char ** argv)
{
    return unzzip_cat(argc, argv, 1);
}

/* 
 * Local variables:
 * c-file-style: "stroustrup"
 * End:
 */