github/RRG-Proxmark3
1
0
Fork 0
mirror of https://github.com/RfidResearchGroup/proxmark3.git synced 2025-08-14 10:37:23 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

refactor: move concatbits() to commonutil

Browse source
This commit is contained in:
douniwan5788 2024-09-16 15:54:17 +08:00
commit e5c0007f0b
4 changed files with 17 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

15
common/commonutil.c
View file

@ -563,3 +563,18 @@ void reverse_arraybytes_copy(uint8_t *arr, uint8_t *dest, size_t len) {
dest[i] = reflect8(arr[i]);
}
}
size_t concatbits(uint8_t *dst, size_t dstskip, const uint8_t *src, size_t srcstart, size_t srclen) {
// erase dstbuf bits that will be overriden
dst[dstskip / 8] &= 0xFF - ((1 << (7 - (dstskip % 8) + 1)) - 1);
for (size_t i = (dstskip / 8) + 1; i <= (dstskip + srclen) / 8; i++) {
dst[i] = 0;
}
for (size_t i = 0; i < srclen; i++) {
// equiv of dstbufbits[dstbufskip + i] = srcbufbits[srcbufstart + i]
dst[(dstskip + i) / 8] |= ((src[(srcstart + i) / 8] >> (7 - ((srcstart + i) % 8))) & 1) << (7 - ((dstskip + i) % 8));
}
return dstskip + srclen;
}

2
common/commonutil.h
View file

@ -133,4 +133,6 @@ bool hexstr_to_byte_array(const char *hexstr, uint8_t *d, size_t *n);
void reverse_arraybytes(uint8_t *arr, size_t len);
void reverse_arraybytes_copy(uint8_t *arr, uint8_t *dest, size_t len);
size_t concatbits(uint8_t *dst, size_t dstskip, const uint8_t *src, size_t srcstart, size_t srclen);
#endif