//---------- Begin of function ResourceDb::read ----------//
//
// Read in data from the resource file and store in an the buffer of this class
//
// The index field of the current record in the database object is
// used to locate the data in the resource file.
//
// Syntax : read(int recNo)
//
// [int] recNo = the record no. in the database.
// (default : current record no.)
//
// Return : <char*> data pointer
// NULL if the record has not index to data
//
char* ResourceDb::read(int recNo)
{
err_when( !init_flag || !db_obj );
long* indexFieldPtr;
char* recPtr;
if( (recPtr = db_obj->read(recNo)) == NULL )
return NULL;
indexFieldPtr = (long*) (recPtr+index_field_offset);
if( memcmp( indexFieldPtr, " ", 4 ) == 0 )
return NULL; // no sample screen for this file
file_seek( *indexFieldPtr );
data_buf_size = file_get_long();
err_when( use_common_buf && data_buf_size > COMMON_DATA_BUF_SIZE );
if( !use_common_buf )
data_buf = mem_resize( data_buf, data_buf_size );
file_read( data_buf, data_buf_size );
return data_buf;
}
//---------- Begin of function ResourceDb::read_imported ----------//
//
// If ResourceDb is initialized using init_imported(),
// then use read_imported to read the record
//
// <long> offset = offset to the data in the resource file
//
// Return : <char*> data pointer
// NULL if the record has not index to data
//
char* ResourceDb::read_imported(long offset)
{
err_when(!init_flag);
//-------- read from buffer ---------//
// ##### begin Gilbert 4/10 #######//
if( read_all )
{
err_when(offset < 0 || offset >= data_buf_size);
return data_buf + offset + sizeof(int32_t); // bypass the long parameters which is the size of the data
}
// ##### end Gilbert 4/10 #######//
//---------- read from file ---------//
// ##### begin Gilbert 2/10 ######//
err_when(offset >= file_size());
// ##### end Gilbert 2/10 ######//
file_seek( offset );
data_buf_size = file_get_long();
err_when(use_common_buf && data_buf_size > COMMON_DATA_BUF_SIZE);
if( !use_common_buf )
data_buf = mem_resize( data_buf, data_buf_size );
file_read( data_buf, data_buf_size );
return data_buf;
}