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main.cpp
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main.cpp
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#include "mainwindow.h"
#include <QApplication>
#include <QFile>
#include <QDebug>
#include <iostream>
int default_max_diff_report = 50;
int default_diff_ratio = 60;
int default_max_diff_len = 32;
int default_diff_ctx_len = 32;
int default_max_bit_shifts = 80;
int default_match_ratio = 90;
int default_min_match_length = 20;
void dumpFile(const QString &filename)
{
QFile file(filename);
file.open(QFile::ReadOnly);
QByteArray data = file.readAll();
file.close();
for (int i=0; i<data.size(); i++) {
for (unsigned char j=128; j>0; j /= 2) {
std::cout << ((data.at(i) & j) ? "1" : "0");
}
}
std::cout << std::endl;
}
void testBitAt();
bool bitAt(const QByteArray &bytes, int pos)
{
return (bytes.at(pos/8) & (1<<(7-(pos%8)))) != 0;
}
void testFindNextDiff();
int findNextDiff(const QByteArray &bytes1, int pos1,
const QByteArray &bytes2, int pos2)
{
int n = 0;
while ( (pos1+n) < (8*bytes1.count()) &&
(pos2+n) < (8*bytes2.count()) &&
(bitAt(bytes1, pos1+n) == bitAt(bytes2, pos2+n)) )
n++;
return n;
}
void testDiffLength();
int diffLength(const QByteArray &bytes1, int pos1,
const QByteArray &bytes2, int pos2,
int maxlen, int ratio)
{
int n = 0;
int ndiff = 0;
while ( (pos1+n) < (8*bytes1.count()) &&
(pos2+n) < (8*bytes2.count()) &&
(n < maxlen) ) {
if (bitAt(bytes1, pos1+n) != bitAt(bytes2, pos2+n)) {
ndiff+=1;
}
if ((100*(ndiff+1))/(n+1) > ratio)
n++;
else
break;
}
if ((pos1+n) >= (8*bytes1.count())) {
return qMin(8*bytes2.count() - pos2, maxlen);
}
if ((pos2+n) >= (8*bytes2.count())) {
return qMin(8*bytes1.count() - pos1, maxlen);
}
return n;
}
int matchLength(const QByteArray &bytes1, int pos1,
const QByteArray &bytes2, int pos2,
int minlen, int ratio)
{
int n = 0;
int nmatch = 0;
while ( (pos1+n) < (8*bytes1.count()) &&
(pos2+n) < (8*bytes2.count()) &&
(n < minlen) ) {
if (bitAt(bytes1, pos1+n) == bitAt(bytes2, pos2+n)) {
nmatch+=1;
}
if ((100*(nmatch+1))/(n+1) > ratio)
n++;
else
break;
}
return n;
}
void dumpDiff(const QByteArray &data1, int pos1,
const QByteArray &data2, int pos2,
int len, int /*ctxlen*/)
{
std::cout << QString("@@ -%1,%2 +%3,%4 @@")
.arg(pos1, 8, 16, QLatin1Char('0'))
.arg(len, 8, 16, QLatin1Char('0'))
.arg(pos2, 8, 16, QLatin1Char('0'))
.arg(len, 8, 16, QLatin1Char('0'))
.toStdString() << std::endl;
int l1 = qMin(len, 8*data1.size() - pos1);
for (int j = 0; j < l1; j++)
std::cout << (bitAt(data1, pos1 + j) == true ? "1" : "0");
std::cout << std::endl;
int l2 = qMin(len, 8*data2.size() - pos2);
for (int j = 0; j < l2; j++)
std::cout << (bitAt(data2, pos2 + j) == true ? "1" : "0");
std::cout << std::endl;
int l = qMin(l1, l2);
for (int j = 0; j < l; j++)
std::cout << (bitAt(data1, pos1 + j) == bitAt(data2, pos2 + j) ? " " : "^");
std::cout << std::endl;
}
void dumpShift(const QByteArray &data1, int pos1,
const QByteArray &data2, int pos2,
int len, int shift)
{/*
if (shift == 0)
return;*/
int shift1 = 0;
int shift2 = 0;
if (shift > 0)
shift1 = shift;
else
shift2 = shift;
std::cout << QString("@@ [%5,%6] -%1,%2 +%3,%4 @@")
.arg(pos1+1/*, 8, 16, QLatin1Char('0')*/)
.arg(shift2 - len)
.arg(pos2+1/*, 8, 16, QLatin1Char('0')*/)
.arg(len + shift1)
.arg(len)
.arg(shift)
.toStdString() << std::endl;
int l1 = qMin(len - shift2, 8*data1.size() - pos1);
if (l1 > 0) {
std::cout << "-";
for (int s=0; s<shift1; s++)
std::cout << " ";
for (int j = 0; j < l1; j++)
std::cout << (bitAt(data1, pos1 + j) == true ? "1" : "0");
std::cout << std::endl;
}
int l2 = qMin(len + shift1, 8*data2.size() - pos2);
if (l2 > 0) {
std::cout << "+";
for (int s=0; s>shift2; s--)
std::cout << " ";
for (int j = 0; j < l2; j++)
std::cout << (bitAt(data2, pos2 + j) == true ? "1" : "0");
std::cout << std::endl;
}
std::cout << " ";
for (int j = 0; j < qAbs(shift); j++)
std::cout << "^";
l1 = qMin(len + qAbs(shift) - shift2, 8*data1.size() - pos1);
l2 = qMin(len + qAbs(shift) + shift1, 8*data2.size() - pos2);
int l = qMin(l1, l2);
for (int j = 0; j < l; j++)
std::cout << (bitAt(data1, pos1 - shift2 + j) == bitAt(data2, pos2 + shift1 + j) ? " " : "^");
std::cout << std::endl;
}
int findShift(const QByteArray &data1, int pos1,
const QByteArray &data2, int pos2,
int max_shift,
int min_match,
int match_ratio)
{
// right-shift from
for (int i=0; i <= max_shift; i++) {
if (matchLength(data1, pos1, data2, pos2 + i, min_match, match_ratio) == min_match) {
return i;
}
}
// left-shift from
for (int i=0; i <= max_shift; i++) {
if (matchLength(data1, pos1 + i, data2, pos2, min_match, match_ratio) == min_match) {
return -i;
}
}
return 0;
}
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
testBitAt();
testFindNextDiff();
testDiffLength();
QString filename1 = QString::fromLocal8Bit(argv[1]);
QFile file1(filename1);
file1.open(QFile::ReadOnly);
QByteArray data1 = file1.readAll();
file1.close();
QString filename2 = QString::fromLocal8Bit(argv[2]);
QFile file2(filename2);
file2.open(QFile::ReadOnly);
QByteArray data2 = file2.readAll();
file2.close();
std::cout << "--- " << filename1.toStdString() << std::endl;
std::cout << "+++ " << filename2.toStdString() << std::endl;
int len1 = 8*data1.size();
int pos1 = 0;
int len2 = 8*data2.size();
int pos2 = 0;
int i, l;
int n = 0;
while (pos1 < len1 && pos2 < len2) {
i = findNextDiff(data1, pos1, data2, pos2);
pos1 += i;
pos2 += i;
l = diffLength(data1, pos1, data2, pos2,
default_max_diff_len, default_match_ratio);
// dumpDiff(data1, pos1, data2, pos2, l,
// default_diff_ctx_len);
int s = findShift(data1, pos1, data2, pos2,
default_max_bit_shifts,
default_min_match_length,
default_match_ratio);
dumpShift(data1, pos1, data2, pos2, l, s);
if (s > 0) {
pos2 += s;
}
else if (s < 0) {
pos1 -= s;
}
if (n++ > default_max_diff_report)
break;
pos1 += l;
pos2 += l;
}
return 0;
}
void testBitAt()
{
//qDebug() << "Testing bitAt()...";
QByteArray bytes;
int pos = 0;
bytes.append(0x8A).append(0x56);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == false);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == true);
Q_ASSERT(bitAt(bytes, pos++) == false);
}
void testFindNextDiff()
{
//qDebug() << "Testing findNextDiff()...";
QByteArray b1;
b1.append(0x55).append(0xaa).append(0x35);
QByteArray b2;
b2.append(0x54).append(0x2a).append(0x53);
Q_ASSERT(findNextDiff(b1, 0, b2, 0) == 7);
Q_ASSERT(findNextDiff(b1, 8, b2, 8) == 0);
Q_ASSERT(findNextDiff(b1, 0, b2, 16) == 5);
Q_ASSERT(findNextDiff(b1, 24, b2, 0) == 0);
Q_ASSERT(findNextDiff(b1, 27, b2, 54) == 0);
Q_ASSERT(findNextDiff(b1, 20, b2, 16) == 4);
}
void testDiffLength()
{
//qDebug() << "Testing diffLength()...";
QByteArray b1;
b1.append(0xff).append(0xff).append(0xff);
QByteArray b2;
b2.append(~b1.at(0)).append(~b1.at(1)).append(~b1.at(2));
Q_ASSERT(diffLength(b1, 0, b2, 0, 100, 100) == 24);
Q_ASSERT(diffLength(b1, 0, b2, 0, 11, 100) == 11);
Q_ASSERT(diffLength(b1, 0, b2, 0, 24, 100) == 24);
Q_ASSERT(diffLength(b1, 0, b2, 16, 100, 100) == 24);
Q_ASSERT(diffLength(b1, 0, b2, 16, 5, 100) == 5);
Q_ASSERT(diffLength(b1, 8, b2, 16, 100, 100) == 16);
Q_ASSERT(diffLength(b1, 8, b2, 16, 15, 100) == 15);
QByteArray b0;
b0.append(0x55).append(0xaa).append(0x35);
Q_ASSERT(diffLength(b0, 0, b0, 0, 100, 100) == 0);
Q_ASSERT(diffLength(b0, 0, b0, 0, 3, 100) == 0);
Q_ASSERT(diffLength(b0, 0, b0, 8, 100, 100) == 9);
Q_ASSERT(diffLength(b0, 0, b0, 8, 3, 100) == 3);
}