/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define C_LUCY_SKIPSTEPPER
#include <stdio.h>
#include "Lucy/Util/ToolSet.h"
#include "Lucy/Index/SkipStepper.h"
#include "Lucy/Store/Folder.h"
#include "Lucy/Store/InStream.h"
#include "Lucy/Store/OutStream.h"
SkipStepper*
SkipStepper_new() {
SkipStepper *self = (SkipStepper*)Class_Make_Obj(SKIPSTEPPER);
SkipStepperIVARS *const ivars = SkipStepper_IVARS(self);
// Init.
ivars->doc_id = 0;
ivars->filepos = 0;
return self;
}
void
SkipStepper_Set_ID_And_Filepos_IMP(SkipStepper *self, int32_t doc_id,
int64_t filepos) {
SkipStepperIVARS *const ivars = SkipStepper_IVARS(self);
ivars->doc_id = doc_id;
ivars->filepos = filepos;
}
void
SkipStepper_Read_Record_IMP(SkipStepper *self, InStream *instream) {
SkipStepperIVARS *const ivars = SkipStepper_IVARS(self);
ivars->doc_id += InStream_Read_C32(instream);
ivars->filepos += InStream_Read_C64(instream);
}
String*
SkipStepper_To_String_IMP(SkipStepper *self) {
SkipStepperIVARS *const ivars = SkipStepper_IVARS(self);
return Str_newf("skip doc: %u32 file pointer: %i64", ivars->doc_id,
ivars->filepos);
}
void
SkipStepper_Write_Record_IMP(SkipStepper *self, OutStream *outstream,
int32_t last_doc_id, int64_t last_filepos) {
SkipStepperIVARS *const ivars = SkipStepper_IVARS(self);
const int32_t delta_doc_id = ivars->doc_id - last_doc_id;
const int64_t delta_filepos = ivars->filepos - last_filepos;
// Write delta doc id.
OutStream_Write_C32(outstream, delta_doc_id);
// Write delta file pointer.
OutStream_Write_C64(outstream, delta_filepos);
}