76 lines
1.5 KiB
C++
76 lines
1.5 KiB
C++
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/*=============================================================================
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# Filename: RangeValue.cpp
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# Author: syzz
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# Mail: 1181955272@qq.com
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# Last Modified: 2015-04-26 16:42
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# Description: achieve functions in RangeValue.h
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=============================================================================*/
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#include "RangeValue.h"
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using namespace std;
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RangeValue::RangeValue()
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{
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this->fp = NULL;
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this->transfer.setStr((char*)malloc(1 << 20));
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this->transfer_size = 1 << 20;
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}
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void
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RangeValue::reset()
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{
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fseek(this->fp, 0, SEEK_SET);
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}
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bool
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RangeValue::open()
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{
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if(this->fp != NULL)
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fclose(this->fp);
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if((this->fp = fopen("logs/answer.dat", "w+b")) == NULL)
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return false;
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else
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return true;
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}
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bool
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RangeValue::write(const Bstr* _bp)
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{
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if(this->fp == NULL)
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return false;
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unsigned len = _bp->getLen();
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fwrite(&len, sizeof(unsigned), 1, this->fp);
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fwrite(_bp->getStr(), sizeof(char), len, this->fp);
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return true;
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}
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const Bstr*
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RangeValue::read()
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{
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if(this->fp == NULL)
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return NULL;
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unsigned len = 0;
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fread(&len, sizeof(unsigned), 1, this->fp);
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if(feof(this->fp))
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return NULL; //indicate the end
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if(len + 1 > this->transfer_size)
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{
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transfer.release();
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transfer.setStr((char*)malloc(len+1));
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this->transfer_size = len + 1;
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}
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fread(transfer.getStr(), sizeof(char), len, this->fp);
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transfer.getStr()[len] = '\0'; //set for string() in KVstore
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transfer.setLen(len);
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return &transfer;
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}
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RangeValue::~RangeValue()
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{
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if(this->fp != NULL)
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fclose(this->fp);
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//transfer will de deleted as Bstr
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}
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