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- attempt to speed up file CRC algorithm

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This commit is contained in:
Mark Vejvoda 2010-07-17 19:05:56 +00:00
parent 1ab9850881
commit 7979c6568e
1 changed files with 33 additions and 0 deletions
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33
source/shared_lib/sources/util/checksum.cpp
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@ -13,6 +13,13 @@
#include <cassert>
#include <stdexcept>
#include <fcntl.h> // for open()
#ifdef WIN32
#include <io.h> // for open()
#endif
#include <sys/stat.h> // for open()
#include "util.h"
#include "leak_dumper.h"
@ -58,6 +65,9 @@ void Checksum::addFile(const string &path){
}
void Checksum::addFileToSum(const string &path){
// OLD SLOW FILE I/O
/*
FILE* file= fopen(path.c_str(), "rb");
if(file!=NULL){
@ -75,6 +85,29 @@ void Checksum::addFileToSum(const string &path){
throw runtime_error("Can not open file: " + path);
}
fclose(file);
*/
const double MAX_CRC_FILESIZE = 100000000;
int fd=0;
size_t bytes_read, bytes_expected = MAX_CRC_FILESIZE * sizeof(int8);
int8 *data=0;
const char *infile = path.c_str();
if ((fd = open(infile,O_RDONLY)) < 0)
throw runtime_error("Can not open file: " + path);
if ((data = (int8 *)malloc(bytes_expected)) == NULL)
throw runtime_error("malloc failed, Can not open file: " + path);
bytes_read = read(fd, data, bytes_expected);
//if (bytes_read != bytes_expected)
// throw runtime_error("read failed, Can not open file: " + path);
for(int i = 0; i < bytes_read; i++) {
addByte(data[i]);
}
free(data);
}
int32 Checksum::getSum() {