profuse/Endian.h

219 lines
4.6 KiB
C++

#ifndef __ENDIAN_H__
#define __ENDIAN_H__
// utlities to read/write bytes.
#include <stdint.h>
namespace LittleEndian {
uint8_t Read8(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return (p[0]);
}
uint16_t Read16(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return p[0] | (p[1] << 8);
}
uint32_t Read24(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return (p[0]) | (p[1] << 8) | (p[2] << 16);
}
uint32_t Read32(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return (p[0]) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
}
uint8_t Read8(const void *vp, unsigned offset)
{
return Read8(offset + (const uint8_t *)vp);
}
uint16_t Read16(const void *vp, unsigned offset)
{
return Read16(offset + (const uint8_t *)vp);
}
uint32_t Read24(const void *vp, unsigned offset)
{
return Read24(offset + (const uint8_t *)vp);
}
uint32_t Read32(const void *vp, unsigned offset)
{
return Read32(offset + (const uint8_t *)vp);
}
// write
void Write8(void *vp, uint8_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = x;
}
void Write16(void *vp, uint16_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = (x) & 0xff;
p[1] = (x >> 8) & 0xff;
}
void Write24(void *vp, uint32_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = (x) & 0xff;
p[1] = (x >> 8) & 0xff;
p[2] = (x >> 16) & 0xff;
}
void Write32(void *vp, uint32_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = (x) & 0xff;
p[1] = (x >> 8) & 0xff;
p[2] = (x >> 16) & 0xff;
p[3] = (x >> 24) & 0xff;
}
void Write8(void *vp, unsigned offset, uint8_t x)
{
Write8(offset + (uint8_t *)vp, x);
}
void Write16(void *vp, unsigned offset, uint16_t x)
{
Write16(offset + (uint8_t *)vp, x);
}
void Write24(void *vp, unsigned offset, uint32_t x)
{
Write24(offset + (uint8_t *)vp, x);
}
void Write32(void *vp, unsigned offset, uint32_t x)
{
Write32(offset + (uint8_t *)vp, x);
}
}
namespace BigEndian {
uint8_t Read8(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return p[0];
}
uint16_t Read16(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return (p[0] << 8) | (p[1]);
}
uint32_t Read24(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return (p[0] << 16) | (p[1] << 8) | (p[2]);
}
uint32_t Read32(const void *vp)
{
const uint8_t *p = (const uint8_t *)vp;
return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | (p[3]);
}
uint8_t Read8(const void *vp, unsigned offset)
{
return Read8(offset + (const uint8_t *)vp);
}
uint16_t Read16(const void *vp, unsigned offset)
{
return Read16(offset + (const uint8_t *)vp);
}
uint32_t Read24(const void *vp, unsigned offset)
{
return Read24(offset + (const uint8_t *)vp);
}
uint32_t Read32(const void *vp, unsigned offset)
{
return Read32(offset + (const uint8_t *)vp);
}
// write
void Write8(void *vp, uint8_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = x;
}
void Write16(void *vp, uint16_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = (x >> 8) & 0xff;
p[1] = (x) & 0xff;
}
void Write24(void *vp, uint32_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = (x >> 16) & 0xff;
p[1] = (x >> 8) & 0xff;
p[2] = (x) & 0xff;
}
void Write32(void *vp, uint32_t x)
{
uint8_t *p = (uint8_t *)vp;
p[0] = (x >> 24) & 0xff;
p[1] = (x >> 16) & 0xff;
p[2] = (x >> 8) & 0xff;
p[3] = (x) & 0xff;
}
void Write8(void *vp, unsigned offset, uint8_t x)
{
Write8(offset + (uint8_t *)vp, x);
}
void Write16(void *vp, unsigned offset, uint16_t x)
{
Write16(offset + (uint8_t *)vp, x);
}
void Write24(void *vp, unsigned offset, uint32_t x)
{
Write24(offset + (uint8_t *)vp, x);
}
void Write32(void *vp, unsigned offset, uint32_t x)
{
Write32(offset + (uint8_t *)vp, x);
}
}
#endif