C++ Library to handle BagIt structures. BagIt is a standard format to create transfer packages for digital preservation purposes. See https://en.wikipedia.org/wiki/BagIt for details
http://andreas-romeyke.de
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75 lines
2.3 KiB
75 lines
2.3 KiB
#include <iostream>
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#include <iomanip>
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#include <fstream>
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#include <sstream>
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#include <string>
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#include "checksum.hpp"
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string Checksum::checksum_of_file(string filepath, checksum_algorithms alg) {
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ifstream file (filepath, ios::ate);
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stringstream hex_result;
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// cout << "processing file '" << filepath << "'" << endl;
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if (file.is_open() ) {
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ifstream::pos_type fileSize;
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char * memBlock;
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fileSize = file.tellg();
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memBlock = new char[fileSize];
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file.seekg(0,ios::beg);
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file.read(memBlock, fileSize);
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switch ( alg ) {
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case md5: {
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unsigned char result[MD5_DIGEST_LENGTH];
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MD5((unsigned char*) memBlock, fileSize, result);
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for (int i=0; i<MD5_DIGEST_LENGTH; i++) {
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hex_result<< hex << setw(2) << setfill('0') << (int) result[i];
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}
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break;
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}
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case sha1: {
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unsigned char result[SHA_DIGEST_LENGTH];
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SHA1((unsigned char*) memBlock, fileSize, result);
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for (int i=0; i<SHA_DIGEST_LENGTH; i++) {
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hex_result<< hex << setw(2) << setfill('0') << (int) result[i];
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}
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break;
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}
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}
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delete memBlock;
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// cout << "# # CHECKSUM for filepath '" << filepath << "' " << hex_result.str() << endl;
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file.close();
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} else {
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cout << "file '"<< filepath << "' could not be opened" << endl;
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}
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return hex_result.str();
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}
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oxum_t Checksum::oxum_of_file(string filepath) {
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ifstream file (filepath, ios::ate);
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oxum_t oxum;
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//cout << "processing file '" << filepath << "'" << endl;
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if (file.is_open() ) {
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ifstream::pos_type fileSize;
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fileSize = file.tellg();
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oxum.octetcount = fileSize;
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oxum.streamcount = 1;
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file.close();
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} else {
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cout << "file '"<< filepath << "' could not be opened" << endl;
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}
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return oxum;
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}
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oxum_t Checksum::oxum_of_filelist( list<string> files) {
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oxum_t oxum;
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oxum.octetcount=0;
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oxum.streamcount=0;
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list<string>::iterator i;
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for (i=files.begin(); i!= files.end(); i++) {
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oxum_t tmp = this->oxum_of_file( *i );
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oxum.octetcount+= tmp.octetcount;
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oxum.streamcount+= tmp.streamcount;
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}
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return oxum;
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}
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// vim: set tabstop=4 softtabstop=0 expandtab shiftwidth=4 smarttab
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