campo-sirio/al/examples/ex11con.c

/*
 * EX11CON.C
 *
 *  C/DOS Example program for ArchiveLib 2.0
 *
 *  Copyright (c) Greenleaf Software, Inc. 1994 - 1996
 *  All Rights Reserved
 *
 * MEMBERS/FUNCTIONS DEMONSTRATED
 *
 *  ALStorageCreate()
 *  ALStorageIsOpen()
 *  ALStorageReadLong()
 *  ALStorageReadShort()
 *  ALStorageWriteChar()
 *  ALStorageWriteLong()
 *  ALStorageWriteShort()
 *  ALStorageWriteString()
 *
 * DESCRIPTION
 *
 *  This simple example program is used to test the hardware independent
 *  WritePortable...() functions.  It does this by creating a test
 *  file, writing a bunch of stuff out to it, then reading the same
 *  stuff back in.
 *
 * REVISION HISTORY
 *
 *  February 1, 1996  2.0A  : Second release
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>

#include "al.h"

int create_test( void );
int read_test( void );

/*
 * The way this program works is a little funny.  The first time you run
 * it, it just creates TESTFILE.DAT.  From then on, it will perform the
 * read tests.  If you want it to go back and create the file again, you
 * just need to delete TESTFILE.DAT.
 */

int main()
{
 FILE *f = fopen( "TESTFILE.DAT", "r" );

 printf( "Archive Library 2.0\nEX11CON.C\n\n" );
 printf( "The way this program works is a little funny.  The first time you run\n" );
 printf( "it, it just creates TESTFILE.DAT.  From then on, it will perform the\n" );
 printf( "read tests.  If you want it to go back and create the file again, you\n" );
 printf( "just need to delete TESTFILE.DAT.\n\n" );
 getch();

 if ( f ) {
     fclose( f );
     read_test();
 } else
     create_test();
 return 1;
}

/*
 * This routine is called if the file didn't already exist when the program
 * started.  It creates the file, then writes out the data using the
 * portable functions.  The data is pretty simple, no tricks here.
 */

int create_test()
{
 hALStorage file;
 long spot;
 int i;

 printf( "Creating TESTFILE.DAT\n" );
 printf( "Run this program a second time to test data file structure\n" );
 file = newALFile( "TESTFILE.DAT" );
 ALStorageCreate( file, AL_DEFAULT );
 if ( !ALStorageIsOpen( file ) ) {
     printf( "Error creating file!\n" );
     return 1;
 }
 ALStorageWriteGlLong( file, 0x12345678L );
 ALStorageWriteGlLong( file, 0xfedcba98L );
 ALStorageWritePkLong( file, 0x87654321L );
 ALStorageWritePkShort( file, 0x2345 );
 ALStorageWriteGlShort( file, 0x5566 );
 ALStorageWriteGlShort( file, (short int) 0x9988 );
 for ( i = 0 ; i < 256 ; i++ )
     ALStorageWriteChar( file, i );
 ALStorageWriteString( file, "ABCDE" );
 spot = ALStorageTell( file );
 ALStorageWriteGlLong( file, spot );
 deleteALStorage( file );
 return 0;
}

/*
 * The second time you run this program, you read back in all the data
 * from the file that was created earlier.  This gets a little more
 * complicated, because all the data has to be read into local variables,
 * then checked for errors.  That's why this routine is twice as long
 * as the guy that writes stuff out.
 */

int read_test()
{
 hALStorage file;
 long dat1 = 0;
 long dat2 = 0;
 short int dat3 = 0;
 short int dat4 = 0;
 int i;
 short length = 0;
 char buffer[ 5 ];
 long my_spot;
 long his_spot = 0;

 printf( "Reading TESTFILE.DAT\n" );
 file = newALFile( "TESTFILE.DAT" );
 ALStorageOpen( file );
 if ( !ALStorageIsOpen( file ) ) {
     printf( "Error opening file!\n" );
     return 1;
 }
 ALStorageReadGlLong( file, &dat1 );
 ALStorageReadGlLong( file, &dat2 );
 if ( dat1 != 0x12345678L || dat2 != 0xfedcba98L ) {
     printf( "Error reading long data\n" );
     return 1;
 }
 ALStorageReadPkLong( file, &dat1 );
 if ( dat1 != 0x87654321L ) {
     printf( "Error reading long Pk data\n" );
     return 1;
 }
 ALStorageReadPkShort( file, &dat3 );
 if ( dat3 != 0x2345 ) {
     printf( "Error reading short Pk data\n" );
     return 1;
 }
 ALStorageReadGlShort( file, &dat3 );
 ALStorageReadGlShort( file, &dat4 );
 if ( dat3 != 0x5566 || dat4 != (short) 0x9988 ) {
     printf( "Error reading short data\n" );
     return 1;
 }
 for ( i = 0 ; i < 256 ; i++ ) {
     int c = ALStorageReadChar( file );
     if ( c != i ) {
         printf( "Error reading characater data, position %d\n", i );
         return 1;
     }
 }
/*
 * Reading strings is still a hassle, you have to do it manually, there is
 * no readstring function available as a public member.
 */
 ALStorageReadGlShort( file, &length );
 ALStorageReadBuffer( file, (unsigned char *) buffer, 5 );
 if ( length != 5 || memcmp( buffer, "ABCDE", 5 ) != 0 ) {
     printf( "Error reading string\n" );
     return 1;
 }
 my_spot = ALStorageTell( file );
 ALStorageReadGlLong( file, &his_spot );
 if ( my_spot != his_spot ) {
     printf( "Error in Tell()!\n" );
     return 1;
 }
 printf( "File passed all tests.\n" );
 deleteALStorage( file );
 return 0;
}