Add Bytes class from a former project
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151
Bytes.cpp
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151
Bytes.cpp
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/***************************************************************************
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* By Théophile Bastian, 2017
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* M1 Network course project at ENS Cachan, Juliusz Chroboczek.
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* License: WTFPL v2 <http://www.wtfpl.net/>
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**************************************************************************/
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/***************************************************************************
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* Reused from a former project, by Théophile Bastian & Nathanaël Courant
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* git@github.com:tobast/sysres-pikern.git
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**************************************************************************/
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#include "Bytes.h"
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#include <cstring>
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#include <algorithm>
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using namespace std;
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Bytes::Bytes() : data(), firstIndex(0) {}
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Bytes::Bytes(const void* buff, size_t len) : data(), firstIndex(0) {
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data.reserve(len);
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for(size_t pos=0; pos < len; pos++)
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data.push_back(((u8*)buff)[pos]);
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}
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u8& Bytes::operator[](const size_t pos) {
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if(pos < size())
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return data[pos+firstIndex];
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throw OutOfRange();
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}
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u8 Bytes::operator[](const size_t pos) const {
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if(pos < size())
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return data[pos+firstIndex];
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throw OutOfRange();
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}
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u16 Bytes::ushortAt(const size_t pos) const {
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if(pos+1 < size())
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return (((u16)data[pos+firstIndex+1])<<8)+data[pos+firstIndex];
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throw OutOfRange();
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}
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size_t Bytes::size() const {
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return data.size() - firstIndex;
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}
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Bytes& Bytes::operator<<(char v) {
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insertData<char>(v);
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return *this;
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}
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Bytes& Bytes::operator<<(u8 v) {
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insertData<u8>(v);
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return *this;
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}
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Bytes& Bytes::operator<<(u16 v) {
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insertData<u16>(v);
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return *this;
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}
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Bytes& Bytes::operator<<(u32 v) {
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insertData<u32>(v);
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return *this;
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}
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Bytes& Bytes::operator<<(const Bytes& v) {
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data.reserve(data.size() + v.size());
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for(size_t byte=0; byte < v.size(); byte++)
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data.push_back(v[byte]);
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return *this;
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}
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Bytes& Bytes::operator<<(const char* str) {
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unsigned len = strlen(str);
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data.reserve(data.size() + len);
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for(unsigned byte=0; byte < len; byte++)
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data.push_back(str[byte]);
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return *this;
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}
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Bytes& Bytes::operator>>(u8& v) {
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extractData<u8>(v);
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return *this;
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}
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Bytes& Bytes::operator>>(u16& v) {
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extractData<u16>(v);
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return *this;
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}
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Bytes& Bytes::operator>>(u32& v) {
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extractData<u32>(v);
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return *this;
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}
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Bytes& Bytes::operator>>(char& v) {
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extractData<char>(v);
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return *this;
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}
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void Bytes::operator=(const Bytes& oth) {
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firstIndex=0;
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data.clear();
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data.reserve(oth.size());
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for(size_t pos=0; pos < oth.size(); pos++)
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data.push_back(oth[pos]);
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}
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Bytes Bytes::sub(size_t beg, size_t len) const {
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if(beg+len >= size())
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throw OutOfRange();
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Bytes out;
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for(size_t byte=0; byte < len; byte++)
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out << (*this)[byte+beg];
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return out;
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}
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void Bytes::writeToBuffer(void* buff, unsigned maxLen) const {
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if(maxLen == 0)
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maxLen = size();
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for(size_t pos=0; pos < min((size_t)maxLen, size()); pos++)
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((u8*)buff)[pos] = (*this)[pos];
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}
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char charOfDigit(u8 dig) {
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if(dig < 10)
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return dig+'0';
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return dig+'A'-10;
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}
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void hexdumpByte(Bytes& dest, u8 b) {
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dest << charOfDigit(b/16) << charOfDigit(b & 0xf);
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}
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void Bytes::hexdump(Bytes& dest) const {
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for(unsigned pos=0; pos < size(); pos++) {
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hexdumpByte(dest, (*this)[pos]);
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if(pos % 32 == 31)
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dest << '\n';
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else if(pos % 4 == 3)
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dest << ' ';
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}
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if(size() % 32 != 0)
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dest << '\n';
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}
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template<typename T> void Bytes::extractData(T& v) {
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if(size() < sizeof(v))
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throw OutOfRange();
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for(size_t byte=0; byte < sizeof(v); byte++)
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v = (v<<8) | data[firstIndex+byte];
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firstIndex += sizeof(v);
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}
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template<typename T> void Bytes::insertData(T v) {
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for(int byte=sizeof(v)-1; byte >= 0; byte--) {
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data.push_back((u8) (v >> (8*byte)));
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}
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}
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79
Bytes.h
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79
Bytes.h
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/***************************************************************************
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* By Théophile Bastian, 2017
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* M1 Network course project at ENS Cachan, Juliusz Chroboczek.
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* License: WTFPL v2 <http://www.wtfpl.net/>
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**************************************************************************/
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/***************************************************************************
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* Reused from a former project, by Théophile Bastian & Nathanaël Courant
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* git@github.com:tobast/sysres-pikern.git
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**************************************************************************/
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#pragma once
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#include <cstdlib>
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#include <vector>
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#include <exception>
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#include "data.h"
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class Bytes {
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public:
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class OutOfRange : public std::exception {};
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/// Exception -- thrown by operator[]
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Bytes();
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Bytes(const void* buff, size_t len);
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/// Initializes the object with [buff], reading [len] bytes.
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u8& operator[](const size_t pos);
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u8 operator[](const size_t pos) const;
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/// Accesses the [pos]th element. Throws OutOfRange if pos >= size()
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u16 ushortAt(const size_t pos) const;
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/// Accesses the 16 bits unsigned integet at position [pos].
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/// Throws OutOfRange if [pos+15] >= size().
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size_t size() const;
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/// Returns the number of chars in the object.
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Bytes& operator<<(char v);
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Bytes& operator<<(u8 v);
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Bytes& operator<<(u16 v);
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Bytes& operator<<(u32 v);
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Bytes& operator<<(const Bytes& v);
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Bytes& operator<<(const char* str);
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/// Appends the given data to the vector. Returns *this to allow
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/// chaining.
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Bytes& operator>>(u8& v);
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Bytes& operator>>(u16& v);
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Bytes& operator>>(u32& v);
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Bytes& operator>>(char& c);
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/// Extracts the given data type from the vector. Returns *this to
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/// allow chaining.
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void operator=(const Bytes& oth);
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/// Copies the given Bytes object into its own data.
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Bytes sub(size_t beg, size_t len) const;
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/// Extracts a sub-bytes, beginning at character [beg], containing
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/// [len] chars. If [beg+len] >= [size()], throws OutOfRange.
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void writeToBuffer(void* buff, unsigned maxLen=0) const;
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/// Writes the contents of this array in the buffer [buff].
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/// The user must provide a buffer of at least [size()] bytes.
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/// If [maxLen] != 0, writes at most [maxLen] bytes to buff.
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void hexdump(Bytes& dest) const;
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/// Dumps the packet to [dest] in hexadecimal form.
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private: //meth
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template<typename T> void insertData(T v);
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template<typename T> void extractData(T& v);
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private:
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std::vector<u8> data;
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size_t firstIndex;
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};
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13
main.cpp
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13
main.cpp
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@ -0,0 +1,13 @@
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/***************************************************************************
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* By Théophile Bastian, 2017
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* M1 Network course project at ENS Cachan, Juliusz Chroboczek.
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* License: WTFPL v2 <http://www.wtfpl.net/>
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**************************************************************************/
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#include "nw_constants.h"
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#include "data.h"
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int main(int argc, char** argv) {
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//TODO read arguments
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}
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