github/proxmark3
1
0
Fork 0
mirror of https://github.com/Proxmark/proxmark3.git synced 2025-08-19 21:03:23 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

adjust ManchesterEncode

Browse source 
removed dead size check
added a max size of 2k input bits (4k out)
this shouldn't overload the array memory passed to it typically...
This commit is contained in:
marshmellow42 2017-03-21 09:53:14 -04:00
commit 86b8ecb56e
1 changed files with 6 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

10
common/lfdemod.c
View file

@ -308,15 +308,17 @@ uint32_t manchesterEncode2Bytes(uint16_t datain) {
//by marshmellow //by marshmellow
//encode binary data into binary manchester //encode binary data into binary manchester
//NOTE: BitStream must have double the size available in memory to do the swap //NOTE: BitStream must have triple the size of "size" available in memory to do the swap
int ManchesterEncode(uint8_t *BitStream, size_t size) { int ManchesterEncode(uint8_t *BitStream, size_t size) {
size_t modIdx=size, i=0; //allow up to 4K out (means BitStream must be at least 2048+4096 to handle the swap)
if (size>modIdx) return -1; size = (size>2048) ? 2048 : size;
size_t modIdx = size;
size_t i;
for (size_t idx=0; idx < size; idx++){ for (size_t idx=0; idx < size; idx++){
BitStream[idx+modIdx++] = BitStream[idx]; BitStream[idx+modIdx++] = BitStream[idx];
BitStream[idx+modIdx++] = BitStream[idx]^1; BitStream[idx+modIdx++] = BitStream[idx]^1;
} }
for (; i<(size*2); i++){ for (i=0; i<(size*2); i++){
BitStream[i] = BitStream[i+size]; BitStream[i] = BitStream[i+size];
} }
return i; return i;