#ifndef _H_MEMSTREAMS
#define _H_MEMSTREAMS
#include <Security/memutils.h>
#include <Security/endian.h>
namespace Security
{
namespace LowLevelMemoryUtilities
{
class Writer {
private:
void *advance(size_t size)
{
void *here = alignUp(writePos);
writePos = increment(here, size);
return here;
}
public:
Writer() { }
Writer(void *base) : writePos(base) { }
void operator = (void *base) { writePos = base; }
template <class T>
T *operator () (const T &obj)
{ T *here = (T *)advance(sizeof(T)); *here = obj; return here; }
void *operator () (const void *addr, size_t size)
{ void *here = advance(size); return memcpy(here, addr, size); }
char *operator () (const char *s)
{ return (char *)(*this)(s, strlen(s) + 1); }
void countedData(const void *data, uint32 length)
{ Endian<uint32> temp = length; (*this)(temp); (*this)(data, length); }
template <class Data>
void countedData(const Data &data)
{ countedData(data.data(), data.length()); }
class Counter;
private:
void *writePos; };
class Writer::Counter {
private:
void align() { totalSoFar = alignUp(totalSoFar); }
public:
Counter() : totalSoFar(0) { }
operator size_t () { return totalSoFar; }
template <class T> size_t operator () (const T &) { align(); return totalSoFar += sizeof(T); }
size_t insert(size_t size) { align(); return totalSoFar += size; }
size_t operator () (const char *s) { align(); return totalSoFar += strlen(s) + 1; }
void countedData(const void *, uint32 length)
{ insert(sizeof(uint32)); insert(length); }
template <class Data>
void countedData(const Data &data)
{ countedData(data.data(), data.length()); }
private:
size_t totalSoFar; };
class Reader {
private:
const void *advance(size_t size = 0)
{
const void *here = alignUp(readPos);
readPos = increment(here, size);
return here;
}
public:
Reader() { }
Reader(const void *base) : readPos(base) { }
void operator = (const void *base) { readPos = base; }
template <class T>
void operator () (T &obj) { obj = *reinterpret_cast<const T *>(advance(sizeof(T))); }
void operator () (void *addr, size_t size) { memcpy(addr, advance(size), size); }
void operator () (const char * &s)
{ s = reinterpret_cast<const char *>(advance()); advance(strlen(s) + 1); }
template <class T>
const T *get(size_t size)
{ return reinterpret_cast<const T *>(advance(size)); }
void countedData(const void * &data, uint32 &length)
{ Endian<uint32> temp; (*this)(temp); length = temp; data = advance(length); }
private:
void operator () (char * &s);
private:
const void *readPos; };
}
}
#endif //_H_MEMUTILS