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This commit is contained in:
Andrey Gumirov
2024-01-11 13:48:10 +07:00
parent a2b5c8117d
commit b9b0ab5edb
4 changed files with 54 additions and 60 deletions
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3
MashZip.cpp
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@ -20,6 +20,7 @@ void MashZip::unmashzip_stream(std::basic_istream<char> &is, std::basic_ostream<
// load huffman table
HuffmanTable ht(header);
ibitstream ibs(is);
char sym = '\0';
@ -40,13 +41,11 @@ void MashZip::unmashzip_stream(std::basic_istream<char> &is, std::basic_ostream<
void MashZip::mashzip_file(std::basic_istream<char> &cs, std::basic_istream<char> &is, std::basic_ostream<char> &os)
{
// std::ifstream ifs(name, std::ios::binary);
// is.seekg(0);
os.write(MAGIC, 4);
// build huffman table by file
HuffmanTable ht(cs);
// is.seekg(0); // reset position as ht reads whole file
os.write(ht.to_header(), HEADER_SIZE);

7
bitstream.cpp
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@ -6,11 +6,6 @@
// i.e when stream is 0b12345678 0bABCDEFGH and command is
// to read 12 bits:
// out = 00000000 00000000 0000EFGH 12345678 -- wrong
// to read 2 bits:
// out = 00000000 00000000 00000000 00000078
// TODO:
// to read 12 bits:
// out = 00000000 00000000 00008765 4321HGFE
// to read 2 bits:
// out = 00000000 00000000 00000000 00000087
@ -55,7 +50,7 @@ int ibitstream::getbits(size_t n) {
// " inv " << std::bitset<8>(inv) << " out " << std::bitset<32>(out) << std::endl;
this->count += to_read;
read += to_read;
// read += to_read;
n -= to_read;
if (this->count == 8){

2
huffman_table.cpp
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@ -200,7 +200,7 @@ int HuffmanTable::decode_one_symbol(ibitstream &bs)
char *HuffmanTable::to_header() {
char *header = new char[HEADER_SIZE];
for (size_t i = 0; i < HEADER_SIZE; i++)
for (size_t i = 0; i < HEADER_SIZE; i++) // iterate over header bytes
{
if (huffmanCodes.find(2 * i) != huffmanCodes.end()) {
int len = huffmanCodes[2 * i].first;

102
main.cpp
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@ -194,76 +194,76 @@ using namespace std;
//// Huffman coding algorithm
int main(int argc, char **argv)
{
// // buildHuffmanTree(cin);
// // 10111010 11110101
// stringstream ss("\xba\xf5");
// ibitstream ibs(ss);
// buildHuffmanTree(cin);
// 10111010 11110101
stringstream ss("\xba\xf5");
ibitstream ibs(ss);
// // 10111010 11110101
// // ^^
// int a = ibs.getbits(2);
// cout << bitset<2>(a) << endl; // 01
// 10111010 11110101
// ^^
int a = ibs.getbits(2);
cout << bitset<2>(a) << endl; // 01
// // 10111010 11110101
// // ^^^^
// int b = ibs.getbits(4);
// cout << bitset<4>(b) << endl; // 0111
// 10111010 11110101
// ^^^^
int b = ibs.getbits(4);
cout << bitset<4>(b) << endl; // 0111
// // 10111010 11110101
// // ^^ ^^^^^^^
// b = ibs.getbits(9);
// cout << bitset<9>(b) << endl; // 011010111
// 10111010 11110101
// ^^ ^^^^^^^
b = ibs.getbits(9);
cout << bitset<9>(b) << endl; // 011010111
// // 10111010 11110101
// // ^ + overflow
// try {
// b = ibs.getbits(10);
// cout << b << endl;
// } catch (std::runtime_error &e) {
// cout << "Got runtime error: " << e.what() << endl;
// }
// 10111010 11110101
// ^ + overflow
try {
b = ibs.getbits(10);
cout << b << endl;
} catch (std::runtime_error &e) {
cout << "Got runtime error: " << e.what() << endl;
}
// ostringstream so("bits: ");
// obitstream obs(so);
ostringstream so("bits: ");
obitstream obs(so);
// obs.writebits(0xf, 3);
// cout << "After 3 bits: " << so.str() << endl;
// // cache here: 00000111
obs.writebits(0xf, 3);
cout << "After 3 bits: " << so.str() << endl;
// cache here: 00000111
// // de = 11011110
// obs.writebits(0xde, 7);
// // here: Flush: 11101111
// cout << "After 7 bits: " << so.str() << endl;
// obs.flush();
// // here: Flush: 00000001
// cout << "After flush: " << so.str() << endl;
// de = 11011110
obs.writebits(0xde, 7);
// here: Flush: 11101111
cout << "After 7 bits: " << so.str() << endl;
obs.flush();
// here: Flush: 00000001
cout << "After flush: " << so.str() << endl;
// obs.writebits(0xbeef, 16);
// cout << "After 0xbeef: " << so.str() << endl;
// obs.flush();
// // here: Flush: 0xEFBE - reversed!
// cout << "After flush: " << so.str() << endl;
obs.writebits(0xbeef, 16);
cout << "After 0xbeef: " << so.str() << endl;
obs.flush();
cout << "After flush: " << so.str() << endl;
// string s = ;
// // string s = ;
stringstream ss1("Some long text!!!!\x01\x02\x03\x04\n123123456789 privet, masha!");
stringstream ss2("Some long text!!!!\x01\x02\x03\x04\n123123456789 privet, masha!");
stringstream so1;
stringstream so2;
// stringstream ss1("Some long text!!!!\x01\x02\x03\x04\n123123456789 privet, masha!");
// stringstream ss2("Some long text!!!!\x01\x02\x03\x04\n123123456789 privet, masha!");
// stringstream so1;
// stringstream so2;
MashZip mz;
// MashZip mz;
mz.mashzip_file(ss1, ss2, so1);
// mz.mashzip_file(ss1, ss2, so1);
std::cout << "After mashzip: " << so1.str();
// // std::cout << "After mashzip: " << so1.str();
// std::cout << so1.str();
mz.unmashzip_stream(so1, so2);
// mz.unmashzip_stream(so1, so2);
std::cout << "After unmashzip: " << so2.str();
// std::cout << "After unmashzip: " << so2.str();
// HuffmanTable ht(ss1);