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nvmutil: simplify endianness handling 

Signed-off-by: Leah Rowe <leah@libreboot.org>
btrfsvols
Leah Rowe 2023-10-12 15:53:29 +01:00
parent 3162d60d52
commit 1f3316422d
1 changed files with 10 additions and 11 deletions
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21
util/nvmutil/nvmutil.c
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@ -15,7 +15,7 @@
void cmd_setchecksum(void), cmd_brick(void), cmd_copy(void), writeGbeFile(void),
cmd_dump(void), cmd_setmac(void), readGbeFile(void), showmac(int partnum),
hexdump(int partnum), xorswap_buf(int partnum), openFiles(const char *path);
hexdump(int partnum), handle_endianness(int partnum), openFiles(const char *path);
int macAddress(const char *strMac, uint16_t *mac), validChecksum(int partnum);
uint8_t hextonum(char chs), rhex(void);
@ -28,7 +28,7 @@ uint16_t buf16[SIZE_4KB], mac[3] = {0, 0, 0};
uint8_t *buf = (uint8_t *) &buf16;
size_t nf = 128, gbe[2];
uint8_t nvmPartModified[2] = {0, 0}, skipread[2] = {0, 0};
int endian = 1, flags = O_RDWR, rfd, fd, part, gbeFileModified = 0;
int e = 1, flags = O_RDWR, rfd, fd, part, gbeFileModified = 0;
const char *strMac = NULL, *strRMac = "??:??:??:??:??:??", *filename = NULL;
@ -53,7 +53,6 @@ void (*cmd)(void) = NULL;
#define xopen(f,l,p) if (opendir(l) != NULL) err(errno = EISDIR, "%s", l); \
if ((f = open(l, p)) == -1) err(ERR(), "%s", l); \
if (fstat(f, &st) == -1) err(ERR(), "%s", l)
#define handle_endianness(r) if (((uint8_t *) &endian)[0] ^ 1) xorswap_buf(r)
#define word(pos16, partnum) buf16[pos16 + (partnum << 11)]
#define setWord(pos16, p, val16) if ((gbeFileModified = 1) && \
@ -250,14 +249,6 @@ validChecksum(int partnum)
return (errno = ECANCELED) & 0;
}
void
xorswap_buf(int partnum)
{
uint8_t *n = (uint8_t *) gbe[partnum];
for (size_t w = 0, x = 1; w < nf; w += 2, x += 2)
n[w] ^= n[x], n[x] ^= n[w], n[w] ^= n[x];
}
void
writeGbeFile(void)
{
@ -271,3 +262,11 @@ writeGbeFile(void)
errno = 0;
err_if(close(fd) == -1);
}
void
handle_endianness(int partnum)
{
uint8_t *n = (uint8_t *) gbe[partnum];
for (size_t w = nf * ((uint8_t *) &e)[0], x = 1; w < nf; w += 2, x += 2)
n[w] ^= n[x], n[x] ^= n[w], n[w] ^= n[x];
}