RetroArch/deps/7zip/Bra.c

135 lines
3.6 KiB
C

/* Bra.c -- Converters for RISC code
2010-04-16 : Igor Pavlov : Public domain */
#include <stdint.h>
#include "Bra.h"
size_t ARM_Convert(uint8_t *data, size_t size, uint32_t ip, int encoding)
{
size_t i;
if (size < 4)
return 0;
size -= 4;
ip += 8;
for (i = 0; i <= size; i += 4)
{
if (data[i + 3] == 0xEB)
{
uint32_t dest;
uint32_t src = ((uint32_t)data[i + 2] << 16) | ((uint32_t)data[i + 1] << 8) | (data[i + 0]);
src <<= 2;
if (encoding)
dest = ip + (uint32_t)i + src;
else
dest = src - (ip + (uint32_t)i);
dest >>= 2;
data[i + 2] = (uint8_t)(dest >> 16);
data[i + 1] = (uint8_t)(dest >> 8);
data[i + 0] = (uint8_t)dest;
}
}
return i;
}
size_t ARMT_Convert(uint8_t *data, size_t size, uint32_t ip, int encoding)
{
size_t i;
if (size < 4)
return 0;
size -= 4;
ip += 4;
for (i = 0; i <= size; i += 2)
{
if ((data[i + 1] & 0xF8) == 0xF0 &&
(data[i + 3] & 0xF8) == 0xF8)
{
uint32_t dest;
uint32_t src =
(((uint32_t)data[i + 1] & 0x7) << 19) |
((uint32_t)data[i + 0] << 11) |
(((uint32_t)data[i + 3] & 0x7) << 8) |
(data[i + 2]);
src <<= 1;
if (encoding)
dest = ip + (uint32_t)i + src;
else
dest = src - (ip + (uint32_t)i);
dest >>= 1;
data[i + 1] = (uint8_t)(0xF0 | ((dest >> 19) & 0x7));
data[i + 0] = (uint8_t)(dest >> 11);
data[i + 3] = (uint8_t)(0xF8 | ((dest >> 8) & 0x7));
data[i + 2] = (uint8_t)dest;
i += 2;
}
}
return i;
}
size_t PPC_Convert(uint8_t *data, size_t size, uint32_t ip, int encoding)
{
size_t i;
if (size < 4)
return 0;
size -= 4;
for (i = 0; i <= size; i += 4)
{
if ((data[i] >> 2) == 0x12 && (data[i + 3] & 3) == 1)
{
uint32_t src = ((uint32_t)(data[i + 0] & 3) << 24) |
((uint32_t)data[i + 1] << 16) |
((uint32_t)data[i + 2] << 8) |
((uint32_t)data[i + 3] & (~3));
uint32_t dest;
if (encoding)
dest = ip + (uint32_t)i + src;
else
dest = src - (ip + (uint32_t)i);
data[i + 0] = (uint8_t)(0x48 | ((dest >> 24) & 0x3));
data[i + 1] = (uint8_t)(dest >> 16);
data[i + 2] = (uint8_t)(dest >> 8);
data[i + 3] &= 0x3;
data[i + 3] |= dest;
}
}
return i;
}
size_t SPARC_Convert(uint8_t *data, size_t size, uint32_t ip, int encoding)
{
uint32_t i;
if (size < 4)
return 0;
size -= 4;
for (i = 0; i <= size; i += 4)
{
if ((data[i] == 0x40 && (data[i + 1] & 0xC0) == 0x00) ||
(data[i] == 0x7F && (data[i + 1] & 0xC0) == 0xC0))
{
uint32_t src =
((uint32_t)data[i + 0] << 24) |
((uint32_t)data[i + 1] << 16) |
((uint32_t)data[i + 2] << 8) |
((uint32_t)data[i + 3]);
uint32_t dest;
src <<= 2;
if (encoding)
dest = ip + i + src;
else
dest = src - (ip + i);
dest >>= 2;
dest = (((0 - ((dest >> 22) & 1)) << 22) & 0x3FFFFFFF) | (dest & 0x3FFFFF) | 0x40000000;
data[i + 0] = (uint8_t)(dest >> 24);
data[i + 1] = (uint8_t)(dest >> 16);
data[i + 2] = (uint8_t)(dest >> 8);
data[i + 3] = (uint8_t)dest;
}
}
return i;
}