github/RRG-Proxmark3
1
0
Fork 0
mirror of https://github.com/RfidResearchGroup/proxmark3.git synced 2025-08-20 05:13:46 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions 4

add: reflect48

Browse source
This commit is contained in:
douniwan5788 2024-09-17 22:54:43 +08:00
commit eda204bf87
2 changed files with 8 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

7
common/commonutil.c
View file

@ -144,6 +144,13 @@ uint32_t reflect32(uint32_t b) {
return v; return v;
} }
uint64_t reflect48(uint64_t v) {
uint64_t vhi = reflect16(v >> 32);
uint64_t vlo = reflect32(v);
v = (vlo << 32) | (vhi & 0xFFFF);
return v;
}
uint64_t reflect64(uint64_t b) { uint64_t reflect64(uint64_t b) {
// https://graphics.stanford.edu/~seander/bithacks.html#BitReverseTable // https://graphics.stanford.edu/~seander/bithacks.html#BitReverseTable
uint64_t v = b; // 64-bit word to reverse bit order uint64_t v = b; // 64-bit word to reverse bit order

1
common/commonutil.h
View file

@ -74,6 +74,7 @@ uint32_t reflect(uint32_t v, int b); // used in crc.c ...
uint8_t reflect8(uint8_t b); // dedicated 8bit reversal uint8_t reflect8(uint8_t b); // dedicated 8bit reversal
uint16_t reflect16(uint16_t b); // dedicated 16bit reversal uint16_t reflect16(uint16_t b); // dedicated 16bit reversal
uint32_t reflect32(uint32_t b); // dedicated 32bit reversal uint32_t reflect32(uint32_t b); // dedicated 32bit reversal
uint64_t reflect48(uint64_t b); // dedicated 48bit reversal
uint64_t reflect64(uint64_t b); // dedicated 64bit reversal uint64_t reflect64(uint64_t b); // dedicated 64bit reversal
void num_to_bytes(uint64_t n, size_t len, uint8_t *dest); void num_to_bytes(uint64_t n, size_t len, uint8_t *dest);