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/*
Copyright (c) by respective owners including Yahoo!, Microsoft, and
individual contributors. All rights reserved. Released under a BSD
license as described in the file LICENSE.
*/
#ifndef COMP_IO_BUF_H_
#define COMP_IO_BUF_H_
#include "io_buf.h"
#include "v_array.h"
#include "zlib.h"
#include <stdio.h>
class comp_io_buf : public io_buf
{
public:
v_array<gzFile> gz_files;
comp_io_buf()
{
init();
}
virtual int open_file(const char* name, bool stdin_off, int flag=READ){
gzFile fil=NULL;
int ret = -1;
switch(flag){
case READ:
if (*name != '\0')
fil = gzopen(name, "rb");
else if (!stdin_off)
#ifdef _WIN32
fil = gzdopen(_fileno(stdin), "rb");
#else
fil = gzdopen(fileno(stdin), "rb");
#endif
if(fil!=NULL){
gz_files.push_back(fil);
ret = (int)gz_files.size()-1;
files.push_back(ret);
}
else
ret = -1;
break;
case WRITE:
fil = gzopen(name, "wb");
if(fil!=NULL){
gz_files.push_back(fil);
ret = (int)gz_files.size()-1;
files.push_back(ret);
}
else
ret = -1;
break;
default:
std::cerr << "Unknown file operation. Something other than READ/WRITE specified" << std::endl;
ret = -1;
}
return ret;
}
virtual void reset_file(int f){
gzFile fil = gz_files[f];
gzseek(fil, 0, SEEK_SET);
endloaded = space.begin;
space.end = space.begin;
}
virtual ssize_t read_file(int f, void* buf, size_t nbytes)
{
gzFile fil = gz_files[f];
int num_read = gzread(fil, buf, (unsigned int)nbytes);
return (num_read > 0) ? num_read : 0;
}
virtual inline ssize_t write_file(int f, const void* buf, size_t nbytes)
{
gzFile fil = gz_files[f];
int num_written = gzwrite(fil, buf, (unsigned int)nbytes);
return (num_written > 0) ? num_written : 0;
}
virtual void flush()
{
if (write_file(files[0], space.begin, space.size()) != (int) ((space.size())))
std::cerr << "error, failed to write to cache\n";
space.end = space.begin;
}
virtual bool close_file(){
gzFile fil;
if(files.size()>0){
fil = gz_files[files.pop()];
gzclose(fil);
gz_files.delete_v();
return true;
}
return false;
}
};
#endif /* COMP_IO_BUF_H_ */
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