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src
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fast_stl.h
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2003-01-17
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/*
VC++6付属のSTLは余りに遅いので簡単な高速化バージョンを作る。
# SGIのSTLportも速いらしい...
展開速度が約3倍になった。
by tsuneo. 2000/09/14
*/
#ifndef __FAST_OFSTREAM_H
#define __FAST_OFSTREAM_H
#include <stdio.h>
class fast_fstream
{
FILE *m_fp;
bool m_berror;
bool m_bwrite;
int m_count;
public:
fast_fstream(){
m_fp = NULL;
m_berror = false;
m_bwrite = false;
m_count = 0;
};
~fast_fstream(){
close();
};
void open(const char *fname, int mode){
if(mode & ios::out){m_bwrite=true;}
m_fp = fopen(fname, (m_bwrite ? "wb" : "rb"));
m_berror = (m_fp == NULL);
};
bool fail(){
return m_berror;
};
void write(const char *buf, int n){
int m = fwrite(buf,1,n,m_fp);
m_count = m;
m_berror = (m!=n);
};
void read(char *buf, int n){
int m = fread(buf,1,n,m_fp);
m_count = m;
m_berror = (m!=n);
}
void close(){
if(m_fp){
fclose(m_fp);
m_fp = NULL;
}
};
int gcount(){return m_count;}
};
class fast_strstreambuf
{
int buf_size;
char *buf;
int start_pos;
int end_pos;
public:
fast_strstreambuf(){
buf = new char[2];
buf_size = 2;
start_pos = end_pos = 0;
};
~fast_strstreambuf(){
delete [] buf;
};
int in_avail(){
return ((end_pos - start_pos) & (buf_size - 1));
};
int write(char *writebuf, int n){
int n2 = n;
while(buf_size - in_avail() <= n){
char *p = new char[buf_size*2];
char *newbuf = p;
while(start_pos != end_pos){
*p++ = buf[start_pos++];
start_pos &= (buf_size-1);
}
start_pos = 0;
end_pos = p - newbuf;
delete [] buf;
buf = newbuf;
buf_size *= 2;
}
while(n2>0){
buf[end_pos ++] = *writebuf++;
end_pos &= (buf_size-1);
n2--;
}
return n-n2;
};
int read(char *readbuf, int n){
int n2 = n;
while(n2>0){
*readbuf++ = buf[start_pos++];
start_pos &= (buf_size-1);
n2--;
}
return n-n2;
};
};
class fast_strstream
{
fast_strstreambuf streambuf;
public:
int write(char *writebuf, int n){
return streambuf.write(writebuf,n);
};
int read(char *writebuf, int n){
return streambuf.read(writebuf,n);
};
void put(char c){
write(&c, 1);
};
fast_strstreambuf *rdbuf(){
return &streambuf;
}
};
#endif // __FAST_OFSTREAM_H