64 lines
1.0 KiB
C++
64 lines
1.0 KiB
C++
#pragma once
|
|
#include <stdint.h>
|
|
#include <string>
|
|
#include <vector>
|
|
#include <exception>
|
|
#include "javaendian.h"
|
|
|
|
namespace util
|
|
{
|
|
class membuffer
|
|
{
|
|
public:
|
|
membuffer(char *buffer, std::size_t size)
|
|
{
|
|
current = start = buffer;
|
|
end = start + size;
|
|
}
|
|
~membuffer()
|
|
{
|
|
// maybe? possibly? left out to avoid confusion. for now.
|
|
// delete start;
|
|
}
|
|
/**
|
|
* Read some value. That's all ;)
|
|
*/
|
|
template <class T> void read(T &val)
|
|
{
|
|
val = *(T *)current;
|
|
current += sizeof(T);
|
|
}
|
|
/**
|
|
* Read a big-endian number
|
|
* valid for 2-byte, 4-byte and 8-byte variables
|
|
*/
|
|
template <class T> void read_be(T &val)
|
|
{
|
|
val = util::bigswap(*(T *)current);
|
|
current += sizeof(T);
|
|
}
|
|
/**
|
|
* Read a string in the format:
|
|
* 2B length (big endian, unsigned)
|
|
* length bytes data
|
|
*/
|
|
void read_jstr(std::string &str)
|
|
{
|
|
uint16_t length = 0;
|
|
read_be(length);
|
|
str.append(current, length);
|
|
current += length;
|
|
}
|
|
/**
|
|
* Skip N bytes
|
|
*/
|
|
void skip(std::size_t N)
|
|
{
|
|
current += N;
|
|
}
|
|
|
|
private:
|
|
char *start, *end, *current;
|
|
};
|
|
}
|