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fastq_reader_win.h
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fastq_reader_win.h
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/*
A fastq object
@file fastq_reader.h
@author Akshay Avvaru
@version 0.1 02/11/2020
*/
#include <fstream>
#include <iostream>
#include <vector>
using namespace std;
namespace fastq {
struct Read {
unsigned int count;
string identifier;
string sequence;
string separator;
string baseQual;
bool valid=true;
void reset() { identifier=""; sequence=""; separator=""; baseQual=""; }
};
/*
* An object for parsing fastq file
* Format of fastq files
* Each read is represented by four lines
* 1. Identifier - Contains read name and information. Starts with "@".
* 2. Sequence - Sequence of the read.
* 3. Separator - Separator usually "+".
* 4. Qual - Base call quality string.
*/
class FastqFile {
private:
std::string file_name {};
Read read;
unsigned int read_count = 0, bases = 0, total_reads = 0;
public:
std::ifstream ins; // made public to check for input file error
public:
/*
* Opens fastq_file and stores the stream in "ins"
* @param name name of the fastq file
*/
void parse(std::string name) {
file_name = name;
ins.open(file_name);
}
/*
* Fetches a read data
* @returns Read a information of the current read
*/
Read fetch() {
read.valid = false;
if (ins.eof()) {
// std::cout << "End of the file reached! Total reads: " << read_count << '\n';
ins.close(); // close the file
// reset read to have empty members and return read
read.reset(); read.valid = false;
}
else {
std::getline(ins, read.identifier);
std::getline(ins, read.sequence);
std::getline(ins, read.separator);
std::getline(ins, read.baseQual);
if (read.identifier != "") {
read.valid = true;
read_count++; bases += read.sequence.length();
}
}
return read;
}
/* Returns current read count */
unsigned int currentCount() { return read_count; }
/* Returns total bases so far */
unsigned int currentBases() { return bases; }
};
}