voxelcore/src/util/data_io.hpp

#ifndef UTIL_DATA_IO_HPP_
#define UTIL_DATA_IO_HPP_

#include "../typedefs.h"

namespace dataio {
    /* Read big-endian 16 bit signed integer from bytes */
    inline int16_t read_int16_big(const ubyte* src, size_t offset) {
        return (src[offset] << 8) | 
               (src[offset+1]);
    }
    /* Read big-endian 32 bit signed integer from bytes */
    inline int32_t read_int32_big(const ubyte* src, size_t offset) {
        return (src[offset] << 24) | 
               (src[offset+1] << 16) | 
               (src[offset+2] << 8) | 
               (src[offset+3]);
    }
    /* Read big-endian 64 bit signed integer from bytes */
    inline int64_t read_int64_big(const ubyte* src, size_t offset) {
        return (int64_t(src[offset]) << 56) | 
               (int64_t(src[offset+1]) << 48) | 
               (int64_t(src[offset+2]) << 40) | 
               (int64_t(src[offset+3]) << 32) |
               (int64_t(src[offset+4]) << 24) | 
               (int64_t(src[offset+5]) << 16) | 
               (int64_t(src[offset+6]) << 8) | 
               (int64_t(src[offset+7]));
    }
    /* Write big-endian 16 bit signed integer to bytes */
    inline void write_int16_big(int16_t value, ubyte* dest, size_t offset) {
        dest[offset] = (char) (value >> 8 & 255);
        dest[offset+1] = (char) (value >> 0 & 255);
    }
    /* Write big-endian 32 bit signed integer to bytes */
    inline void write_int32_big(int32_t value, ubyte* dest, size_t offset) {
        dest[offset] = (char) (value >> 24 & 255);
        dest[offset+1] = (char) (value >> 16 & 255);
        dest[offset+2] = (char) (value >> 8 & 255);
        dest[offset+3] = (char) (value >> 0 & 255);
    }
    /* Write big-endian 64 bit signed integer to bytes */
    inline void write_int64_big(int64_t value, ubyte* dest, size_t offset) {
        dest[offset] = (char) (value >> 56 & 255);
        dest[offset+1] = (char) (value >> 48 & 255);
        dest[offset+2] = (char) (value >> 40 & 255);
        dest[offset+3] = (char) (value >> 32 & 255);

        dest[offset+4] = (char) (value >> 24 & 255);
        dest[offset+5] = (char) (value >> 16 & 255);
        dest[offset+6] = (char) (value >> 8 & 255);
        dest[offset+7] = (char) (value >> 0 & 255);
    }
}

#endif // UTIL_DATA_IO_HPP_