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adjust ManchesterEncode

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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
parent ec187c2f9f
commit 86b8ecb56e
1 changed files with 6 additions and 4 deletions
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10
common/lfdemod.c
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@ -308,15 +308,17 @@ uint32_t manchesterEncode2Bytes(uint16_t datain) {
//by marshmellow
//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) {
size_t modIdx=size, i=0;
if (size>modIdx) return -1;
//allow up to 4K out (means BitStream must be at least 2048+4096 to handle the swap)
size = (size>2048) ? 2048 : size;
size_t modIdx = size;
size_t i;
for (size_t idx=0; idx < size; idx++){
BitStream[idx+modIdx++] = BitStream[idx];
BitStream[idx+modIdx++] = BitStream[idx]^1;
}
for (; i<(size*2); i++){
for (i=0; i<(size*2); i++){
BitStream[i] = BitStream[i+size];
}
return i;