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memaccess: generic functions for accessing memory.

This commit is contained in:
Maxim Poliakovski 2021-02-03 23:36:32 +01:00
parent 478ca1065f
commit aa0f43d89f
1 changed files with 79 additions and 0 deletions
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79
memaccess.h
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@ -7,6 +7,7 @@
#include "endianswap.h"
#include <cinttypes>
#include <thirdparty/loguru/loguru.hpp>
/* read an aligned big-endian WORD (16bit) */
#define READ_WORD_BE_A(addr) (BYTESWAP_16(*((uint16_t*)((addr)))))
@ -99,4 +100,82 @@
(addr)[3] = ((val) >> 24) & 0xFF; \
} while (0)
/* read value of the specified size from memory starting at addr,
perform byte swapping when necessary so that the source
byte order remains unchanged. */
inline uint32_t read_mem(const uint8_t* buf, uint32_t size) {
switch (size) {
case 4:
return READ_DWORD_BE_A(buf);
break;
case 2:
return READ_WORD_BE_A(buf);
break;
case 1:
return *buf;
break;
default:
LOG_F(WARNING, "READ_MEM: invalid size %d!", size);
return 0;
}
}
/* read value of the specified size from memory starting at addr,
perform byte swapping when necessary so that the destination data
will be in the reversed byte order. */
inline uint32_t read_mem_rev(const uint8_t* buf, uint32_t size) {
switch (size) {
case 4:
return READ_DWORD_LE_A(buf);
break;
case 2:
return READ_WORD_LE_A(buf);
break;
case 1:
return *buf;
break;
default:
LOG_F(WARNING, "READ_MEM_REV: invalid size %d!", size);
return 0;
}
}
/* write the specified value of the specified size to memory pointed
to by addr, perform necessary byte swapping so that the byte order
of the destination remains unchanged. */
inline void write_mem(uint8_t* buf, uint32_t value, uint32_t size) {
switch (size) {
case 4:
WRITE_DWORD_BE_A(buf, value);
break;
case 2:
WRITE_WORD_BE_A(buf, value & 0xFFFFU);
break;
case 1:
*buf = value & 0xFF;
break;
default:
LOG_F(WARNING, "WRITE_MEM: invalid size %d!", size);
}
}
/* write the specified value of the specified size to memory pointed
to by addr, perform necessary byte swapping so that the destination
data in memory will be in the reversed byte order. */
inline void write_mem_rev(uint8_t* buf, uint32_t value, uint32_t size) {
switch (size) {
case 4:
WRITE_DWORD_LE_A(buf, value);
break;
case 2:
WRITE_WORD_LE_A(buf, value & 0xFFFFU);
break;
case 1:
*buf = value & 0xFF;
break;
default:
LOG_F(WARNING, "WRITE_MEM_REV: invalid size %d!", size);
}
}
#endif /* MEM_ACCESS_H */