Jump to content
Tuts 4 You

HashTable Library for MASM32

diablo2oo2

By diablo2oo2
in Programming and Coding

Recommended Posts

diablo2oo2

diablo2oo2

Posted
Posted (edited)

I was missing a comfortable way to manage complex data structures in MASM.

Java coders will know the HashTable class, which is very useful to store data.

i coded something similar with more functions for MASM and other programming languages.

features:

-it will organize memory itself (will use the windows Heap functions)

-like in java you can access items via a key which can be a String or an integer

-support for nested hashtables (so you can create very easy complex data trees)

-save/load the hashtable to disk or memory (with nested hashtables)

the example will show how to create following hashtable structure:


;	ht_1
;	  |
;	  +-0-->"hello 1"
;	  +-1-->"hello 2"
;	  +-2-->"hello 3"
;	  +-"string key"-->"hello 4"
;	  |
;	  +-"ht_2"--->ht_2
;			|
;			+-0-->"i am in the second hashtable"
;			+-123->binary_data

hashtable.zip

Edited by diablo2oo2
  • Like 1
Killboy

Killboy

Posted
Posted

Congratulations on reinventing the wheel I guess whistling.gif

diablo2oo2

diablo2oo2

Posted
  • Author
Posted

Congratulations on reinventing the wheel I guess whistling.gif

hehe, sure its nothing new. but i really missed this feature when i was cooding with MASM. so now you i have a library to save very easy project data structures.

mudlord

mudlord

Posted
Posted

Nice.

With adding binary data, do we need to check the size of binary data when retrieving, or does your library return size when getting the data?

diablo2oo2

diablo2oo2

Posted
  • Author
Posted (edited)

i have to admit its not a real hashtable, but its still useful.

With adding binary data, do we need to check the size of binary data when retrieving, or does your library return size when getting the data?

there are two functions to get the data from the table.


;this one copy the data to a destination buffer and returns the size
ht_copy_item_data proc public uses ebx _ht,_key,_options,_dest	fn ht_get_item,_ht,_key,_options
	.if eax
		mov ebx,eax		.if [ebx].HT_ITEM.i_options & ITEM_DWORD
			mov edx,_dest
			m2m [edx],[ebx].HT_ITEM.i_data
		.else
			fn RtlMoveMemory,_dest,[ebx].HT_ITEM.i_data,[ebx].HT_ITEM.i_size
		.endif		mov eax,[ebx].HT_ITEM.i_size	;return size
	.endif
	ret
ht_copy_item_data endp;and this one just returns a pointer to the data,which is stored in the table
;if the data is just a dword value (it will return directly the value and not a pointer)
ht_get_item_data proc public uses ebx  _ht,_key,_options	fn ht_get_item,_ht,_key,_options
	.if eax
		mov ebx,eax
		mov eax,[ebx].HT_ITEM.i_data	.endif
	ret
ht_get_item_data endp
Edited by diablo2oo2
mudlord

mudlord

Posted
Posted

Brilliant :D

Any chance of a C header?

diablo2oo2

diablo2oo2

Posted
  • Author
Posted (edited)

Brilliant biggrin.png

Any chance of a C header?

hmm , can do it, but i cant promise that it works. i think your c is better than mine.

i would like to translate. but how to handle different returntypes and function parameters? i know in java its possible, but i have no idea about c.

Edited by diablo2oo2
Killboy

Killboy

Posted
Posted

In C, casting to and from void* is as close as it gets.

diablo2oo2

diablo2oo2

Posted
  • Author
Posted

so far the header.

/* NOT WORKING ! NOT FINISHED !
 * to do:
 * handle different return types & parameters
 */#define ITEM_STRING_KEY 1HANDLE __stdcall ht_create();      
void __stdcall ht_close(HANDLE);      
void __stdcall ht_close_all(HANDLE);  
HANDLE __stdcall ht_clone(HANDLE);      
DWORD __stdcall ht_size(HANDLE);void __stdcall ht_put(HANDLE,DWORD,LPBYTE,DWORD,DWORD);      
void __stdcall ht_put_string(HANDLE,DWORD,LPSTR,DWORD);      
void __stdcall ht_put_dword(HANDLE,DWORD,DWORD,DWORD);      
void __stdcall ht_put_hashtable(HANDLE,DWORD,HANDLE,DWORD);
void* __stdcall ht_get_item_data(HANDLE,DWORD,DWORD);      
DWORD __stdcall ht_get_item_size(HANDLE,DWORD,DWORD);
DWORD __stdcall ht_copy_item_data(HANDLE,DWORD,DWORD,LPBYTE);      
void __stdcall ht_remove(HANDLE,DWORD,DWORD);  
void* __stdcall ht_memorydump_create(HANDLE,LPDWORD);
void __stdcall ht_memorydump_close(HANDLE);      
HANDLE __stdcall ht_create_from_memorydump(LPVOID);
DWORD __stdcall ht_write_to_file(HANDLE,LPSTR);      
HANDLE __stdcall ht_read_from_file(LPSTR);

not sure how to define the functions for different parameters:

ht_put(table_1,123,data,datasize,NULL);

or

ht_put(table_1,"123",data,datasize,ITEM_STRING_KEY);

here you can use DWORD or a String for the second parameter!

  • 2 weeks later...
atom0s

atom0s

Posted
Posted

Something like this should help you out diablo, this is how I would convert your inc to C/C++


typedef struct _MD5_CHECKSUM {
    DWORD            dword_1;
    DWORD            dword_2;
    DWORD            dword_3;
    DWORD            dword_4;
} MD5_CHECKSUM, *LPMD5_CHECKSUM;typedef struct _HT_HEADER {
    DWORD            ht_head_sig_1;
    DWORD            ht_head_sig_2;
    DWORD            ht_heap;
    DWORD            ht_items;
    DWORD            ht_itemcount;
    DWORD            ht_itemsize;
    DWORD            ht_compareto;
    MD5_CHECKSUM    ht_las_md5;
} HT_HEADER, *LPHT_HEADER;HT_HEADER*    __stdcall ht_create( void );
void        __stdcall ht_close( HT_HEADER* );
void        __stdcall ht_close_all( HT_HEADER* );

That's just for the first few calls, but from there it should be easy to figure out the rest. I tested these functions and they worked properly for me using my method posted here. :)

diablo2oo2

diablo2oo2

Posted
  • Author
Posted

Something like this should help you out diablo, this is how I would convert your inc to C/C++


typedef struct _MD5_CHECKSUM {
	DWORD			dword_1;
	DWORD			dword_2;
	DWORD			dword_3;
	DWORD			dword_4;
} MD5_CHECKSUM, *LPMD5_CHECKSUM;typedef struct _HT_HEADER {
	DWORD			ht_head_sig_1;
	DWORD			ht_head_sig_2;
	DWORD			ht_heap;
	DWORD			ht_items;
	DWORD			ht_itemcount;
	DWORD			ht_itemsize;
	DWORD			ht_compareto;
	MD5_CHECKSUM	ht_las_md5;
} HT_HEADER, *LPHT_HEADER;HT_HEADER*	__stdcall ht_create( void );
void		__stdcall ht_close( HT_HEADER* );
void		__stdcall ht_close_all( HT_HEADER* );

That's just for the first few calls, but from there it should be easy to figure out the rest. I tested these functions and they worked properly for me using my method posted here. smile.png

but the HT_HEADER structure is not public, so just define it as HANDLE is enough.

atom0s

atom0s

Posted
Posted (edited)

Just a heads up, the build lib/dll don't export ht_close_all, it's missing from the .def file.

Here's a full C/C++ header finished and tested:

#ifndef __HASHTABLE_H_INCLUDED__
#define __HASHTABLE_H_INCLUDED__#pragma comment( lib, "hashtable.lib" )
#include <Windows.h>#define ITEM_STRING_KEY	 1
#define ITEM_DWORD		  2
#define ITEM_HASHTABLE	  4
#define ITEM_MD5_KEY		8
#define ITEM_DATA_POINT	 16#ifdef USE_HASH_STRUCTURES	typedef struct _MD5_CHECKSUM {
   	 DWORD		   dword_1;
   	 DWORD		   dword_2;
   	 DWORD		   dword_3;
   	 DWORD		   dword_4;
	} MD5_CHECKSUM, *LPMD5_CHECKSUM;	typedef struct _HT_HEADER {
		DWORD		   ht_head_sig_1;
		DWORD		   ht_head_sig_2;
		DWORD		   ht_heap;
		DWORD		   ht_items;
		DWORD		   ht_itemcount;
		DWORD		   ht_itemsize;
		DWORD		   ht_compareto;
		MD5_CHECKSUM	ht_las_md5;
	} HT_HEADER, *LPHT_HEADER;	#define HASHHANDLE HT_HEADER*#else	#define HASHHANDLE HANDLE#endifHASHHANDLE  __stdcall ht_create( void );
void		__stdcall ht_close( HASHHANDLE );
void		__stdcall ht_close_all( HASHHANDLE );HASHHANDLE  __stdcall ht_clone( HASHHANDLE );
DWORD	   __stdcall ht_size( HASHHANDLE );void		__stdcall ht_put( HASHHANDLE, DWORD, LPVOID, DWORD, DWORD );
void		__stdcall ht_put_string( HASHHANDLE, LPVOID, const char*, DWORD );
void		__stdcall ht_put_dword( HASHHANDLE, DWORD, DWORD, DWORD );
void		__stdcall ht_put_hashtable( HASHHANDLE, const char*, HASHHANDLE, DWORD );LPVOID	  __stdcall ht_get_item_data( HASHHANDLE, LPVOID, DWORD );
void		__stdcall ht_get_item_size( HASHHANDLE, LPVOID, DWORD );
void		__stdcall ht_copy_item_data( HASHHANDLE, DWORD, DWORD, LPVOID );LPVOID	  __stdcall ht_memorydump_create( HASHHANDLE, DWORD );
void		__stdcall ht_memorydump_close( LPVOID );
void		__stdcall ht_create_from_memorydump( LPVOID );void		__stdcall ht_write_to_file( HASHHANDLE, const char* );
HASHHANDLE  __stdcall ht_read_from_file( const char* );#endif // __HASHTABLE_H_INCLUDED__

Example converted to C:

// This is optional, to use the actual structures
// for debugging purposes..
#define USE_HASH_STRUCTURES#include <Windows.h>
#include <stdio.h>
#include "hashtable.h"BYTE btBinaryData[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 0 };int __cdecl main( int argc, char* argv[] )
{
	HASHHANDLE  ht_1;
	HASHHANDLE  ht_2;
	LPVOID	  lpData;		ht_1 = ht_create();
		ht_2 = ht_create();	printf( "creating a hashtable and saving to file..\r\n" );		ht_put_string( ht_1, (LPVOID) 0, "hello 1", NULL );
		ht_put_string( ht_1, (LPVOID) 1, "hello 2", NULL );
		ht_put_string( ht_1, (LPVOID) 2, "hello 3", NULL );
		ht_put_string( ht_1, "string key", "hello 4", ITEM_STRING_KEY );		ht_put_hashtable( ht_1, "ht_2", ht_2, ITEM_STRING_KEY );		ht_put_string( ht_2, (LPVOID) 0, "i am in the second hashtable", NULL );
		ht_put( ht_2, 123, &btBinaryData, sizeof( btBinaryData ), NULL );		ht_write_to_file( ht_1, "file.bin" );		ht_close( ht_1 );
		ht_close( ht_2 );
	printf( "opening hashtable from saved file..\r\n" );		ht_1 = ht_read_from_file( "file.bin" );		lpData = ht_get_item_data( ht_1, (LPVOID) 0, NULL );
		printf( (const char*) lpData );
		printf( "\r\n" );		lpData = ht_get_item_data( ht_1, (LPVOID) 1, NULL );
		printf( (const char*) lpData );
		printf( "\r\n" );		lpData = ht_get_item_data( ht_1, (LPVOID) 2, NULL );
		printf( (const char*) lpData );
		printf( "\r\n" );		lpData = ht_get_item_data( ht_1, "string key", ITEM_STRING_KEY );
		printf( (const char*) lpData );
		printf( "\r\n" );		ht_2 = ht_get_item_data( ht_1, "ht_2", ITEM_STRING_KEY );		lpData = ht_get_item_data( ht_2, (LPVOID) 0, NULL );
		printf( (const char*) lpData );
		printf( "\r\n" );		lpData = ht_get_item_data( ht_2, (LPVOID) 123, NULL );
		printf( (const char*) lpData );
		printf( "\r\n" );	    //ht_close_all( ht_1 ); // This wont work at the moment since the lib doesn't export it.	return 0;
}
Edited by atom0s

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Go to topic listing
×
×
  • Create New...