360 lines
7.0 KiB
C++
360 lines
7.0 KiB
C++
/*
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* The contents of this file are subject to the Initial
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* Developer's Public License Version 1.0 (the "License");
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* you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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* http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_idpl.
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*
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* Software distributed under the License is distributed AS IS,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied.
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* See the License for the specific language governing rights
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* and limitations under the License.
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*
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* The Original Code was created by Adriano dos Santos Fernandes
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* for the Firebird Open Source RDBMS project.
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*
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* Copyright (c) 2008 Adriano dos Santos Fernandes <adrianosf@gmail.com>
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* and all contributors signed below.
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*
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* All Rights Reserved.
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* Contributor(s): ______________________________________.
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*
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* Paul Reeves, 2023
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*
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*/
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#define FB_UDR_STATUS_TYPE ::Firebird::ThrowStatusWrapper
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//#include <ibase.h>
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//#include <firebird/UdrCppEngine.h>
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#include "MyFirstUDRKit.h"
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#include <cassert>
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#include <cstdio>
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#include <cstdlib>
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#include <iostream>
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#include <fstream>
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#include <vector>
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#ifdef HAVE_MATH_H
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#include <math.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef TIME_WITH_SYS_TIME
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# include <sys/time.h>
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# include <time.h>
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#else
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# ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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# else
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# include <ctime>
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# endif
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#endif
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#ifdef HAVE_SYS_TIMEB_H
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# include <sys/timeb.h>
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#endif
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#ifdef HAVE_LOCALE_H
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#include <locale.h>
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#endif
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#include <limits>
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using namespace std;
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using namespace Firebird;
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// First, let's start with a function from the UdfBackwardCompatibility
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// library and add some additional comments.
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// We will also use self-docmenting variable names
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// //////////////////////////////////////////////////
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/***
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* create function div (
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* anumerator integer,
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* adenominator integer
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* ) returns double precision
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* external name 'MyFirstUDRKit!MFK_div!Divide anumerator by adenominator'
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* engine udr;
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***/
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FB_UDR_BEGIN_FUNCTION(MFK_div)
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// Divide integer anumerator 1 by integer adenominator using the stdlib
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FB_UDR_MESSAGE(InMessage,
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(FB_INTEGER, anumerator)
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(FB_INTEGER, adenominator)
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);
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FB_UDR_MESSAGE(OutMessage,
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(FB_DOUBLE, result)
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);
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FB_UDR_EXECUTE_FUNCTION
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{
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if (in->anumeratorNull || in->adenominatorNull)
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{
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out->resultNull = FB_TRUE;
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out->result = 0;
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}
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else
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{
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out->resultNull = FB_FALSE;
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if (in->adenominator) {
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out->result = div(in->anumerator, in->adenominator).quot;
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}
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else
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{
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// This is old style - surely we can do better?
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out->result = std::numeric_limits<double>::infinity();
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ISC_STATUS_ARRAY StatusVector = {isc_arg_gds, isc_arith_except,
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isc_arg_gds, isc_exception_integer_divide_by_zero, isc_arg_end};
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FbException::check(isc_exception_integer_divide_by_zero, status, StatusVector);
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}
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}
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}
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FB_UDR_END_FUNCTION
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/*** DDL
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create function flagged (
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flags integer,
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flag integer
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) returns integer
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external name 'MyFirstUDRKit!MFK_flagged!How is this function used?'
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engine udr;
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***/
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FB_UDR_BEGIN_FUNCTION(MFK_flagged)
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FB_UDR_MESSAGE(InMessage,
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(FB_INTEGER, flags)
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(FB_INTEGER, flag)
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);
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FB_UDR_MESSAGE(OutMessage,
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(FB_INTEGER, result)
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);
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FB_UDR_EXECUTE_FUNCTION
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{
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// Original code
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// if ( flags == NULL ) {
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// return 0;
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// }
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if ( in->flagsNull != 0 ) {
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out->resultNull = FB_TRUE;
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out->result = 0;
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}
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else
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{
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out->resultNull = FB_FALSE;
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// Original code
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// ISC_UINT64 i = ( 1ULL << *flag );
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// return ( *flags & i ) ? 1 : 0;
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ISC_UINT64 i = ( 1ULL << in->flag );
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out->result = ( in->flags & i ) ? 1 : 0;
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}
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}
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FB_UDR_END_FUNCTION
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/*** DDL
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* create or alter function LoadBlobFromFile (
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* afilename varchar(8191),
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* ablob BLOB
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* ) returns bigint
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* external name 'MyFirstUDRKit!MFKLoadBlobFromFile!Load file and save to Blob'
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* engine udr;
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***/
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FB_UDR_BEGIN_FUNCTION (MFK_LoadBlobFromFile)
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//BEGIN
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FB_UDR_MESSAGE(InMessage,
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(FB_CHAR(8191), afilename)
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(FB_BLOB, ablob)
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);
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FB_UDR_MESSAGE(OutMessage,
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(FB_BIGINT, result)
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);
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AutoRelease<IAttachment> att;
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AutoRelease<ITransaction> tra;
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AutoRelease<IBlob> Blob;
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FB_UDR_EXECUTE_FUNCTION
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{
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// Test Input
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if (in->afilenameNull != 0) {
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out->resultNull = FB_TRUE;
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out->result = 0;
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}
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ifstream File ( in->afilename.str , ios_base::in | ios_base::binary );
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if (! File.is_open()) {
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out->result = -2;
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return;
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}
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// This is wrong - the calling application should pass in a blob handle
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AutoRelease<IBlob> Blob(att->createBlob(status, tra, &in->ablob, 0, nullptr));
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if (Blob == nullptr) {
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out->result = -1;
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return;
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}
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vector<char> Buffer (MaxSegmentSize, 0);
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streamsize DataSize;
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while ( File.good() ) {
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File.read( Buffer.data(), Buffer.size() );
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DataSize = File.gcount();
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Blob->putSegment( status, DataSize, Buffer.data() );
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out->result += DataSize;
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// Perhaps test for badbit here?
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}
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if (File.bad()) { // Something went wrong
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// What to do?
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out->resultNull = FB_TRUE;
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// What do we do with the partially written blob? Is cancel enough?
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Blob->cancel( status );
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// Should we reset result to 0?
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}
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Blob->close( status );
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Blob->release();
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Buffer.clear();
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File.close();
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}
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FB_UDR_END_FUNCTION
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//END
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/***
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create or alter function SaveBlobToFile (
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afilename varchar(8191),
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ablob BLOB
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) returns bigint
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external name 'MyFirstUDRKit!MFK_SaveBlobToFile!Save blob to file'
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engine udr;
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***/
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FB_UDR_BEGIN_FUNCTION(MFK_SaveBlobToFile)
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//BEGIN
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FB_UDR_MESSAGE(InMessage,
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(FB_CHAR(8191), afilename)
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(FB_BLOB, ablob)
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);
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FB_UDR_MESSAGE(OutMessage,
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(FB_BIGINT, result)
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);
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AutoRelease<IAttachment> att;
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AutoRelease<ITransaction> tra;
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AutoRelease<IBlob> Blob;
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FB_UDR_EXECUTE_FUNCTION
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{
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// Test Input
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if (in->afilenameNull != 0 || in->ablobNull != 0 ) {
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out->resultNull = FB_TRUE;
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out->result = 0;
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}
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/*
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* DOC NOTE - We do not test for existence of the file here!
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*/
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fstream File ( in->afilename.str , fstream::out | fstream::binary | fstream::app );
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if (! File.is_open()) {
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out->result = -2;
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return;
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}
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Blob.reset(att->openBlob(status, tra, &in->ablob, 0, nullptr));
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if (Blob == nullptr) {
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out->result = -1;
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return;
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}
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vector<char> Buffer (MaxSegmentSize, 0);
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unsigned BytesRead = 0;
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for (bool Eof = false; !Eof; )
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{
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switch (Blob->getSegment( status, MaxSegmentSize, Buffer.data(), &BytesRead))
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{
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case IStatus::RESULT_OK:
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case IStatus::RESULT_SEGMENT:
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{
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File.write( Buffer.data(), Buffer.size() );
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out->result += BytesRead;
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continue;
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}
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default:
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{
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Blob->close( status ); // will close interface
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Blob.release();
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Eof = true;
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break;
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}
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}
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}
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Buffer.clear();
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File.close();
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}
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FB_UDR_END_FUNCTION
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//END
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/*** DDL
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create function BillDate (
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d integer,
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date
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) returns date
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external name 'my_first_udr_kit!MFK_BillDate!What does BillDate do?'
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engine udr;
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***/
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/*
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FB_UDR_BEGIN_FUNCTION(MFK_BillDate)
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FB_UDR_MESSAGE(InMessage,
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(FB_INTEGER, d)
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(FB_INTEGER, date)
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);
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FB_UDR_MESSAGE(OutMessage,
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(FB_DATE, result)
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);
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FB_UDR_END_FUNCTION
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*/
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