ByteStream
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前公司有个这样的类(感觉很像stringstream)，主要是网络中传数据用的(大概是因为要考虑字节序的问题，所以有了这么一个类)，不过公司的实现有一个可移植性的问题：比如将网络中的一端流入一个int/long类型的数据，只要两端int/long占用字节大小不一致，那么在网络的另一端流出就会出问题。
今天自己依据其原理写了个，当然我的实现在空间上是不及前公司的，因为前公司的有一些优化，比如bool只占1bit，一个int数据可能占1/2/3/4byte；我的没有这些，bool占1bit的思想，我感觉写在上层更好，如果有必要的话；对于比较小的数压缩下空间倒是不错的想法。另外，公司是一个类，我的是三个。
写这篇文章不会被告侵权吧？！
#ifndef __BYTE_STREAM_H__#define __BYTE_STREAM_H__#include <string>using std::string;class ByteStream{public: ByteStream(unsigned short len); ~ByteStream();private: ByteStream(const ByteStream &); ByteStream & operator = (const ByteStream &);public: static void big2little(void * obj, unsigned int size); bool seek(unsigned short offset); unsigned short tell(); unsigned short left();protected: unsigned short m_length; unsigned short m_offset;};class OBStream : public ByteStream{public: OBStream(char * byte, unsigned short len); ~OBStream();public: void init(char * byte, unsigned short len); bool writebytes(unsigned short offset, const void * obj, unsigned short size);public: OBStream & write(const char * ptr, unsigned short size); OBStream & operator << (bool); OBStream & operator << (signed char); OBStream & operator << (unsigned char); OBStream & operator << (signed short); OBStream & operator << (unsigned short); OBStream & operator << (signed int); OBStream & operator << (unsigned int); OBStream & operator << (signed long); OBStream & operator << (unsigned long); OBStream & operator << (float); OBStream & operator << (double); OBStream & operator << (const string &);private: char * m_byte;};class IBStream : public ByteStream{public: IBStream(const char * byte, unsigned short len); ~IBStream();public: void init(const char * byte, unsigned short len); bool readbytes(unsigned short offset, void * obj, unsigned short size);public: IBStream & read(char * ptr, unsigned short size); IBStream & operator >> (bool &); IBStream & operator >> (signed char &); IBStream & operator >> (unsigned char &); IBStream & operator >> (signed short &); IBStream & operator >> (unsigned short &); IBStream & operator >> (signed int &); IBStream & operator >> (unsigned int &); IBStream & operator >> (signed long &); IBStream & operator >> (unsigned long &); IBStream & operator >> (float &); IBStream & operator >> (double &); IBStream & operator >> (string &);private: const char * m_byte;};#endif#include <cassert>#include <cstring>#include "ByteStream.h"ByteStream::ByteStream(unsigned short len) : m_length(len), m_offset(0){ }ByteStream::~ByteStream(){ }void ByteStream::big2little(void * obj, unsigned int size){ static union { unsigned short us; unsigned char uc[sizeof(unsigned short)]; } un; un.us = 0x0001; if (0x00 == un.uc[0]) { char * ptr = static_cast<char *>(obj); for (int i = 0; i < size / 2; ++i) { char temp = ptr[i]; ptr[i] = ptr[size - 1 - i]; ptr[size - 1 - i] = temp; } }}bool ByteStream::seek(unsigned short offset){ if (offset <= m_length) { m_offset = offset; return(true); } else { return(false); }}unsigned short ByteStream::tell(){ return(m_offset);}unsigned short ByteStream::left(){ return(m_length - m_offset);}OBStream::OBStream(char * byte, unsigned short len) : ByteStream(len), m_byte(byte){ }OBStream::~OBStream(){ }void OBStream::init(char * byte, unsigned short len){ m_length = len; m_offset = 0; m_byte = byte;}bool OBStream::writebytes(unsigned short offset, const void * obj, unsigned short size){ if (offset + size <= m_length) { memcpy(m_byte + offset, obj, size); return(true); } else { return(false); }}OBStream & OBStream::write(const char * ptr, unsigned short size){ assert(m_offset + size <= m_length); writebytes(m_offset, ptr, size); m_offset += size; return(*this);}OBStream & OBStream::operator << (bool value){ assert(m_offset + sizeof(bool) <= m_length); big2little(&value, sizeof(bool)); writebytes(m_offset, &value, sizeof(bool)); m_offset += sizeof(bool); return(*this);}OBStream & OBStream::operator << (signed char value){ assert(m_offset + sizeof(signed char) <= m_length); big2little(&value, sizeof(signed char)); writebytes(m_offset, &value, sizeof(signed char)); m_offset += sizeof(signed char); return(*this);}OBStream & OBStream::operator << (unsigned char value){ assert(m_offset + sizeof(unsigned char) <= m_length); big2little(&value, sizeof(unsigned char)); writebytes(m_offset, &value, sizeof(unsigned char)); m_offset += sizeof(unsigned char); return(*this);}OBStream & OBStream::operator << (signed short value){ assert(m_offset + sizeof(signed short) <= m_length); big2little(&value, sizeof(signed short)); writebytes(m_offset, &value, sizeof(signed short)); m_offset += sizeof(signed short); return(*this);}OBStream & OBStream::operator << (unsigned short value){ assert(m_offset + sizeof(unsigned short) <= m_length); big2little(&value, sizeof(unsigned short)); writebytes(m_offset, &value, sizeof(unsigned short)); m_offset += sizeof(unsigned short); return(*this);}OBStream & OBStream::operator << (signed int value){ assert(m_offset + sizeof(unsigned char) + sizeof(signed int) <= m_length); unsigned char size = static_cast<unsigned char>(sizeof(signed int)); operator << (size); big2little(&value, sizeof(signed int)); writebytes(m_offset, &value, sizeof(signed int)); m_offset += sizeof(signed int); return(*this);}OBStream & OBStream::operator << (unsigned int value){ assert(m_offset + sizeof(unsigned char) + sizeof(unsigned int) <= m_length); unsigned char size = static_cast<unsigned char>(sizeof(unsigned int)); operator << (size); big2little(&value, sizeof(unsigned int)); writebytes(m_offset, &value, sizeof(unsigned int)); m_offset += sizeof(unsigned int); return(*this);}OBStream & OBStream::operator << (signed long value){ assert(m_offset + sizeof(unsigned char) + sizeof(signed long) <= m_length); unsigned char size = static_cast<unsigned char>(sizeof(signed long)); operator << (size); big2little(&value, sizeof(signed long)); writebytes(m_offset, &value, sizeof(signed long)); m_offset += sizeof(signed long); return(*this);}OBStream & OBStream::operator << (unsigned long value){ assert(m_offset + sizeof(unsigned char) + sizeof(unsigned long) <= m_length); unsigned char size = static_cast<unsigned char>(sizeof(unsigned long)); operator << (size); big2little(&value, sizeof(unsigned long)); writebytes(m_offset, &value, sizeof(unsigned long)); m_offset += sizeof(unsigned long); return(*this);}OBStream & OBStream::operator << (float value){ assert(m_offset + sizeof(float) <= m_length); big2little(&value, sizeof(float)); writebytes(m_offset, &value, sizeof(float)); m_offset += sizeof(float); return(*this);}OBStream & OBStream::operator << (double value){ assert(m_offset + sizeof(double) <= m_length); big2little(&value, sizeof(double)); writebytes(m_offset, &value, sizeof(double)); m_offset += sizeof(double); return(*this);}OBStream & OBStream::operator << (const string & value){ assert(m_offset + sizeof(unsigned short) + value.size() <= m_length); unsigned short size = static_cast<unsigned short>(value.size()); operator << (size); write(value.c_str(), size); return(*this);}IBStream::IBStream(const char * byte, unsigned short len) : ByteStream(len), m_byte(byte){ }IBStream::~IBStream(){ }void IBStream::init(const char * byte, unsigned short len){ m_length = len; m_offset = 0; m_byte = byte;}bool IBStream::readbytes(unsigned short offset, void * obj, unsigned short size){ if (offset + size <= m_length) { memcpy(obj, m_byte + offset, size); return(true); } else { return(false); }}IBStream & IBStream::read(char * ptr, unsigned short size){ assert(m_offset + size <= m_length); readbytes(m_offset, ptr, size); m_offset += size; return(*this);}IBStream & IBStream::operator >> (bool & value){ assert(m_offset + sizeof(bool) <= m_length); readbytes(m_offset, &value, sizeof(bool)); big2little(&value, sizeof(bool)); m_offset += sizeof(bool); return(*this);}IBStream & IBStream::operator >> (signed char & value){ assert(m_offset + sizeof(signed char) <= m_length); readbytes(m_offset, &value, sizeof(signed char)); big2little(&value, sizeof(signed char)); m_offset += sizeof(signed char); return(*this);}IBStream & IBStream::operator >> (unsigned char & value){ assert(m_offset + sizeof(unsigned char) <= m_length); readbytes(m_offset, &value, sizeof(unsigned char)); big2little(&value, sizeof(unsigned char)); m_offset += sizeof(unsigned char); return(*this);}IBStream & IBStream::operator >> (signed short & value){ assert(m_offset + sizeof(signed short) <= m_length); readbytes(m_offset, &value, sizeof(signed short)); big2little(&value, sizeof(signed short)); m_offset += sizeof(signed short); return(*this);}IBStream & IBStream::operator >> (unsigned short & value){ assert(m_offset + sizeof(unsigned short) <= m_length); readbytes(m_offset, &value, sizeof(unsigned short)); big2little(&value, sizeof(unsigned short)); m_offset += sizeof(unsigned short); return(*this);}IBStream & IBStream::operator >> (signed int & value){ assert(m_offset + sizeof(unsigned char) <= m_length); unsigned char size = 0; operator >> (size); assert(m_offset + size <= m_length); if (sizeof(signed int) == size) { readbytes(m_offset, &value, sizeof(signed int)); big2little(&value, sizeof(signed int)); m_offset += sizeof(signed int); } else if (sizeof(signed int) > size) { value = 0; unsigned char * ptr = reinterpret_cast<unsigned char *>(&value); for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(&value, sizeof(signed int)); } else { assert(sizeof(signed int) <= 8); unsigned char ptr[8] = { 0 }; for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(ptr, size); value = *(reinterpret_cast<signed int *>(ptr)); } return(*this);}IBStream & IBStream::operator >> (unsigned int & value){ assert(m_offset + sizeof(unsigned char) <= m_length); unsigned char size = 0; operator >> (size); assert(m_offset + size <= m_length); if (sizeof(unsigned int) == size) { readbytes(m_offset, &value, sizeof(unsigned int)); big2little(&value, sizeof(unsigned int)); m_offset += sizeof(unsigned int); } else if (sizeof(unsigned int) > size) { value = 0; unsigned char * ptr = reinterpret_cast<unsigned char *>(&value); for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(&value, sizeof(unsigned int)); } else { assert(sizeof(unsigned int) <= 8); unsigned char ptr[8] = { 0 }; for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(ptr, size); value = *(reinterpret_cast<unsigned int *>(ptr)); } return(*this);}IBStream & IBStream::operator >> (signed long & value){ assert(m_offset + sizeof(unsigned char) <= m_length); unsigned char size = 0; operator >> (size); assert(m_offset + size <= m_length); if (sizeof(signed long) == size) { readbytes(m_offset, &value, sizeof(signed long)); big2little(&value, sizeof(signed long)); m_offset += sizeof(signed long); } else if (sizeof(signed long) > size) { value = 0; unsigned char * ptr = reinterpret_cast<unsigned char *>(&value); for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(&value, sizeof(signed long)); } else { assert(sizeof(signed long) <= 8); unsigned char ptr[8] = { 0 }; for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(ptr, size); value = *(reinterpret_cast<signed long *>(ptr)); } return(*this);}IBStream & IBStream::operator >> (unsigned long & value){ assert(m_offset + sizeof(unsigned char) <= m_length); unsigned char size = 0; operator >> (size); assert(m_offset + size <= m_length); if (sizeof(unsigned long) == size) { readbytes(m_offset, &value, sizeof(unsigned long)); big2little(&value, sizeof(unsigned long)); m_offset += sizeof(unsigned long); } else if (sizeof(unsigned long) > size) { value = 0; unsigned char * ptr = reinterpret_cast<unsigned char *>(&value); for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(&value, sizeof(unsigned long)); } else { assert(sizeof(unsigned long) <= 8); unsigned char ptr[8] = { 0 }; for (int i = 0; i < size; ++i) { operator >> (ptr[i]); } big2little(ptr, size); value = *(reinterpret_cast<unsigned long *>(ptr)); } return(*this);}IBStream & IBStream::operator >> (float & value){ assert(m_offset + sizeof(float) <= m_length); readbytes(m_offset, &value, sizeof(float)); big2little(&value, sizeof(float)); m_offset += sizeof(float); return(*this);}IBStream & IBStream::operator >> (double & value){ assert(m_offset + sizeof(double) <= m_length); readbytes(m_offset, &value, sizeof(double)); big2little(&value, sizeof(double)); m_offset += sizeof(double); return(*this);}IBStream & IBStream::operator >> (string & value){ assert(m_offset + sizeof(unsigned short) <= m_length); unsigned short size = 0; operator >> (size); assert(m_offset + size <= m_length); value.resize(size); read(&value[0], size); return(*this);}#include <complex>#include <string>#include <iostream>using namespace std;#include "ByteStream.h"template <typename T>OBStream & operator << (OBStream & obs, const complex<T> & comp){ return(obs << comp.real() << comp.imag());}template <typename T>IBStream & operator >> (IBStream & ibs, complex<T> & comp){ T real; T imag; ibs >> real >> imag; comp = complex<T>(real, imag); return(ibs);}int main(int argc, char * argv[]){ char buffer[100] = { 0 }; bool in_b = true; signed char in_sc = 'a'; unsigned char in_uc = 'A'; signed short in_ss = 12345; unsigned short in_us = 65535; signed int in_si = 123456789; unsigned int in_ui = 987654321; signed long in_sl = 11223344; unsigned long in_ul = 66554433; float in_f = 123456.789f; double in_d = 987654321.123456789; const char * in_ptr = "ByteStream"; string in_str("Hello World"); complex<int> in_comp(123, 456); cout << in_b << endl; cout << in_sc << endl; cout << in_uc << endl; cout << in_ss << endl; cout << in_us << endl; cout << in_si << endl; cout << in_ui << endl; cout << in_sl << endl; cout << in_ul << endl; cout << in_f << endl; cout << in_d << endl; cout << in_ptr << endl; cout << in_str << endl; cout << in_comp << endl; unsigned short in_size = 0; OBStream obs(buffer, 100); (obs << in_size << in_b << in_sc << in_uc << in_ss << in_us << in_si << in_ui << in_sl << in_ul << in_f << in_d).write(in_ptr, 10) << in_str << in_comp; in_size = obs.tell(); obs.seek(0); obs << in_size; obs.seek(in_size); cout << "write " << in_size << " Bytes" << endl; unsigned short out_size; bool out_b; signed char out_sc; unsigned char out_uc; signed short out_ss; unsigned short out_us; signed int out_si; unsigned int out_ui; signed long out_sl; unsigned long out_ul; float out_f; double out_d; char out_ptr[11] = { 0 }; string out_str; complex<int> out_comp; IBStream ibs(buffer, obs.tell()); (ibs >> out_size >> out_b >> out_sc >> out_uc >> out_ss >> out_us >> out_si >> out_ui >> out_sl >> out_ul >> out_f >> out_d).read(out_ptr, 10) >> out_str >> out_comp; cout << "read " << out_size << " Bytes" << endl; cout << out_b << endl; cout << out_sc << endl; cout << out_uc << endl; cout << out_ss << endl; cout << out_us << endl; cout << out_si << endl; cout << out_ui << endl; cout << out_sl << endl; cout << out_ul << endl; cout << out_f << endl; cout << out_d << endl; cout << out_ptr << endl; cout << out_str << endl; cout << out_comp << endl; return(0);}#include <iostream>using namespace std;#include "ByteStream.h"int main(int argc, char * argv[]){ char buffer[32] = { 0 }; unsigned short in_int = 65535; unsigned char in_int_len = sizeof(unsigned short); long in_long = 123456; double * in_p_long = reinterpret_cast<double *>(&in_long); unsigned char in_long_len = sizeof(double); unsigned short in_size = 0; OBStream obs(buffer, 100); obs << in_size; obs << in_int_len << in_int; /* less-int: (len + short) like a 16bit-int*/ obs << in_long_len << (*in_p_long); /* large-long: (len + double) like a 64bit-long */ in_size = obs.tell(); obs.seek(0); obs << in_size; obs.seek(in_size); cout << in_int << endl; cout << in_long << endl; cout << "write " << in_size << " Bytes" << endl; unsigned short out_size = 0; signed int out_int = 0; signed long out_long = 0; IBStream ibs(buffer, obs.tell()); ibs >> out_size; ibs >> out_int; /* large-int */ ibs >> out_long; /* less-long */ cout << "read " << out_size << " Bytes" << endl; cout << out_int << endl; cout << out_long << endl; return(0);}今天被complex<T>整了，1是对它不熟，2是模板报错乱七八糟
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