mdbtools/src/libmdb/data.c

/* MDB Tools - A library for reading MS Access database file
 * Copyright (C) 2000 Brian Bruns
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#include "mdbtools.h"

char *mdb_col_to_string(MdbHandle *mdb, int start, int datatype, int size);

void mdb_bind_col(MdbColumn *col, void *bind_ptr)
{
	col->bind_ptr = bind_ptr;
}
int mdb_find_end_of_row(MdbHandle *mdb, int row)
{
int rows, row_end;

	rows = mdb_get_int16(mdb,8);
	if (row==0) 
		row_end=2047; /* end of page */
	else 
		row_end = mdb_get_int16(mdb, (10 + (row-1) * 2)) - 1;

	return row_end;
}
int mdb_read_row(MdbTableDef *table, int pg_num, int row)
{
MdbHandle *mdb = table->entry->mdb;
MdbColumn col;
int j;
int num_cols, var_cols, fixed_cols;
int row_start, row_end;
int fixed_cols_found, var_cols_found;
int col_start, len;
int eod; /* end of data */
int delflag, lookupflag;

	row_start = mdb_get_int16(mdb, 10+(row*2)); 
	row_end = mdb_find_end_of_row(mdb, row);

	delflag = lookupflag = 0;
	if (row_start & 0x8000) delflag++;
	if (row_start & 0x4000) lookupflag++;
	row_start &= 0x0FFF; /* remove flags */
	fprintf(stdout,"Pg %d Row %d bytes %d to %d %s %s\n", 
		pg_num, row, row_start, row_end,
		lookupflag ? "[lookup]" : "",
		delflag ? "[delflag]" : "");
	
	if (delflag || lookupflag) {
		row_end = row_start-1;
		return 0;
	}

	buffer_dump(mdb->pg_buf, row_start, row_end);

	num_cols = mdb->pg_buf[row_start];
	var_cols = mdb->pg_buf[row_end-1];
	fixed_cols = num_cols - var_cols;
	eod = mdb->pg_buf[row_end-2-var_cols];

	fprintf(stdout,"#cols: %-3d #varcols %-3d EOD %-3d\n", 
		num_cols, var_cols, eod);

	col_start = 1;
	fixed_cols_found = 0;
	var_cols_found = 0;

	/* fixed columns */
	for (j=0;j<table->num_cols;j++) {
		col = g_array_index(table->columns,MdbColumn,j);
		if (mdb_is_fixed_col(&col) &&
		    ++fixed_cols_found <= fixed_cols) {
			fprintf(stdout,"fixed col %s = %s\n",
				col.name,
				mdb_col_to_string(mdb, 
					row_start + col_start,
					col.col_type,
					0));
			col_start += col.col_size;
		}
	}

	/* variable columns */
	for (j=0;j<table->num_cols;j++) {
		col = g_array_index(table->columns,MdbColumn,j);
		if (!mdb_is_fixed_col(&col) &&
		    ++var_cols_found <= var_cols) {
			col_start = mdb->pg_buf[row_end-1-var_cols_found];

			if (var_cols_found==var_cols) 
				len=eod - col_start;
			else 
				len=col_start - mdb->pg_buf[row_end-1-var_cols_found-1];

			fprintf(stdout,"coltype %d colstart %d len %d\n",
				col.col_type,
				col_start, 
				len);
			fprintf(stdout,"var col %s = %s\n", 
				col.name, 
				mdb_col_to_string(mdb,
					row_start + col_start,
					col.col_type,
					len));
			col_start += len;
		}
	}

	row_end = row_start-1;
}

void mdb_data_dump(MdbTableDef *table)
{
MdbHandle *mdb = table->entry->mdb;
int i, pg_num;
int rows;

	for (pg_num=1;pg_num<=table->num_pgs;pg_num++) {
		mdb_read_pg(mdb,table->first_data_pg + pg_num);
		rows = mdb_get_int16(mdb,8);
		fprintf(stdout,"Rows on page %d: %d\n", 
			pg_num + table->first_data_pg, 
			rows);
		for (i=0;i<rows;i++) {
			mdb_read_row(table, table->first_data_pg + pg_num, i);
		}
	}
}

int mdb_is_fixed_col(MdbColumn *col)
{
	/* FIX ME -- not complete */
	if (col->col_type==MDB_TEXT)
		return FALSE;
	else 
		return TRUE;
}
char *mdb_col_to_string(MdbHandle *mdb, int start, int datatype, int size)
{
static char text[256];

	switch (datatype) {
		case MDB_BOOL:
			sprintf(text,"%d", mdb->pg_buf[start]);
			return text;
		break;
		case MDB_INT:
			sprintf(text,"%ld",mdb_get_int16(mdb, start));
			return text;
		break;
		case MDB_LONGINT:
			sprintf(text,"%ld",mdb_get_int32(mdb, start));
			return text;
		break;
		case MDB_TEXT:
			if (size<0) {
				return "(oops)";
			}
			strncpy(text, &mdb->pg_buf[start], size);
			text[size]='\0';
			return text;
		break;
	}
	return NULL;
}