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vcf_file.cpp
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vcf_file.cpp
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/*
* vcf_file.cpp
*
* Created on: Dec 11, 2012
* Author: amarcketta
*/
#include "vcf_file.h"
vcf_file::vcf_file(const parameters &p, bool diff)
{
if (!diff)
{
filename = p.vcf_filename;
compressed = p.vcf_compressed;
stream = p.stream_in;
}
else
{
filename = p.diff_file;
compressed = p.diff_file_compressed;
stream = false;
}
gzMAX_LINE_LEN = 0;
N_entries = 0; N_kept_entries = 0;
meta_data = header();
if (stream && compressed)
open_gz();
else if (stream)
{
char first = cin.peek();
if (first == 0x1f)
LOG.error("File starts with gzip magic string. Shouldn't you be using --gzvcf?\n");
file_in = &std::cin;
}
else
open();
read_header();
include_indv = vector<bool>(meta_data.N_indv,true);
}
vcf_file::~vcf_file()
{
close();
}
void vcf_file::read_header()
{
string line;
unsigned int line_index = 0;
line_index += meta_data.add_FILTER_descriptor("ID=PASS,Description=PASS", line_index);
while (!eof())
{
read_line(line);
if (line[0] == '#')
if (line[1] == '#')
meta_data.parse_meta(line, line_index);
else
{
meta_data.parse_header(line);
return;
}
else
return;
}
}
void vcf_file::print(const parameters ¶ms)
{
LOG.printLOG("Outputting VCF file...\n");
string output_file = params.output_prefix + ".recode.vcf";
streambuf * buf;
ofstream temp_out;
if (!params.stream_out)
{
temp_out.open(output_file.c_str(), ios::out);
if (!temp_out.is_open()) LOG.error("Could not open VCF Output file: " + output_file, 3);
buf = temp_out.rdbuf();
}
else
buf = cout.rdbuf();
ostream out(buf);
for (unsigned int ui=0; ui<meta_data.lines.size(); ui++)
out << meta_data.lines[ui] << endl;
out << "#CHROM\tPOS\tID\tREF\tALT\tQUAL\tFILTER\tINFO";
if (meta_data.N_indv > 0)
out << "\tFORMAT";
for (unsigned int ui=0; ui<meta_data.N_indv; ui++)
if (include_indv[ui])
out << "\t" << meta_data.indv[ui];
out << endl;
vector<char> variant_line;
entry * e = new vcf_entry(meta_data, include_indv);
while(!eof())
{
get_entry(variant_line);
e->reset(variant_line);
N_entries += e->apply_filters(params);
if(!e->passed_filters)
continue;
N_kept_entries++;
e->parse_basic_entry(true, true, true);
e->parse_full_entry(true);
e->parse_genotype_entries(true,true,true,true);
e->print(out, params.recode_INFO_to_keep, params.recode_all_INFO);
}
delete e;
}
void vcf_file::print_bcf(const parameters ¶ms)
{
LOG.printLOG("Outputting BCF file...\n");
BGZF * out;
if(!params.stream_out)
{
string output_file = params.output_prefix + ".recode.bcf";
out = bgzf_open(output_file.c_str(), "w");
}
else
out = bgzf_dopen(1, "w");
string header_str;
uint32_t len_text = 0;
vector<char> header;
char magic[5] = {'B','C','F','\2', '\2'};
bgzf_write(out, magic, 5);
if (meta_data.has_idx)
{
LOG.warning("VCF file contains IDX values in header. These are being removed for conversion to BCF.");
meta_data.reprint();
meta_data.reparse();
}
for (unsigned int ui=0; ui<meta_data.lines.size(); ui++)
{
for (unsigned int uj=0; uj<meta_data.lines[ui].length(); uj++)
header.push_back( meta_data.lines[ui][uj] );
header.push_back('\n');
}
if (meta_data.has_contigs == false)
{
vector<string> contig_vector;
get_contigs(params.contigs_file, contig_vector);
for(unsigned int ui=0; ui<contig_vector.size(); ui++)
{
meta_data.add_CONTIG_descriptor(contig_vector[ui].substr(10, contig_vector[ui].size()-8),int(ui));
for(unsigned int uj=0; uj<contig_vector[ui].size(); uj++)
header.push_back(contig_vector[ui][uj]);
header.push_back('\n');
}
}
header_str = "#CHROM\tPOS\tID\tREF\tALT\tQUAL\tFILTER\tINFO";
if (meta_data.N_indv > 0)
header_str += "\tFORMAT";
for (unsigned int ui=0; ui<meta_data.N_indv; ui++)
if (include_indv[ui])
{
header_str += "\t";
header_str += meta_data.indv[ui];
}
header_str += "\n";
for (unsigned int ui=0; ui<header_str.length(); ui++)
header.push_back( header_str[ui] );
header.push_back( '\0' );
len_text = header.size();
bgzf_write(out, (char *)&len_text, sizeof(len_text) );
bgzf_write(out, (char *)&header[0], len_text );
vector<char> variant_line;
entry * e = new vcf_entry(meta_data, include_indv);
while(!eof())
{
get_entry(variant_line);
e->reset(variant_line);
N_entries += e->apply_filters(params);
if(!e->passed_filters)
continue;
N_kept_entries++;
e->parse_basic_entry(true, true, true);
e->parse_full_entry(true);
e->parse_genotype_entries(true,true,true,true);
e->print_bcf(out, params.recode_INFO_to_keep, params.recode_all_INFO);
}
delete e;
bgzf_close(out);
}
void vcf_file::open()
{
struct stat buf;
int i = stat(filename.c_str(), &buf);
if (i != 0)
{
perror("stat error");
LOG.error("Can't determine file type of " + filename, 0);
}
if (!S_ISREG(buf.st_mode))
LOG.error("Does not appear to be a regular file: " + filename, 0);
if (filename.substr(filename.size()-4) == ".bcf")
LOG.error("Filename ends in '.bcf'. Shouldn't you be using --bcf?\n");
if (!compressed)
{
if (filename.substr(filename.size()-3) == ".gz")
LOG.error("Filename ends in '.gz'. Shouldn't you be using --gzvcf or --gzdiff?\n");
file_tmp.open(filename.c_str(), ios::in);
if (!file_tmp.is_open())
LOG.error("Could not open VCF file: " + filename, 0);
file_in = &file_tmp;
}
else
open_gz();
}
void vcf_file::open_gz()
{
gzMAX_LINE_LEN = 1024*1024;
gz_readbuffer = new char[gzMAX_LINE_LEN];
if (stream)
gzfile_in = gzdopen(fileno(stdin), "r");
else
gzfile_in = gzopen(filename.c_str(), "rb");
if (gzfile_in == NULL)
LOG.error("Could not open GZVCF file: " + filename, 0);
#ifdef ZLIB_VERNUM
string tmp(ZLIB_VERSION);
LOG.printLOG("Using zlib version: " + tmp + "\n");
#if (ZLIB_VERNUM >= 0x1240)
gzbuffer(gzfile_in, gzMAX_LINE_LEN); // Included in zlib v1.2.4 and makes things MUCH faster
#else
LOG.printLOG("Versions of zlib >= 1.2.4 will be *much* faster when reading zipped VCF files.\n");
#endif
#endif
}
void vcf_file::close()
{
if (compressed)
{
gzclose(gzfile_in);
delete [] gz_readbuffer;
}
}
bool vcf_file::eof()
{
bool out;
if (!compressed)
out = file_in->eof();
else
out = gzeof(gzfile_in); // Returns 1 when EOF has previously been detected reading the given input stream, otherwise zero.
return out;
}
void vcf_file::get_entry(vector<char> &out)
{
out.resize(0);
read_line(out);
}
entry* vcf_file::get_entry_object()
{
return new vcf_entry(meta_data, include_indv);
}
void vcf_file::read_line(string &out)
{
char * tmp;
out = "";
if (!compressed)
{
getline(*file_in, out);
out.erase( out.find_last_not_of(" \t\n\r") + 1); // Trim whitespace at end of line
}
else
{
bool again = true;
while (again == true)
{
tmp = gzgets(gzfile_in, gz_readbuffer, gzMAX_LINE_LEN);
if (tmp == NULL)
return;
out.append(gz_readbuffer);
if ((strlen(gz_readbuffer) != gzMAX_LINE_LEN-1) || (gz_readbuffer[gzMAX_LINE_LEN-2] == '\n'))
again = false;
}
out.erase( out.find_last_not_of(" \t\n\r") + 1); // Trim whitespace at end of line (required in gzipped case!)
}
}
void vcf_file::read_line(vector<char> &out)
{
static string tmp;
tmp="";
out.resize(0);
read_line(tmp);
vector<char> tmp_char(tmp.begin(),tmp.end());
out = tmp_char;
}