Add @iceman1001 s presco and pyramid functions +

[proxmark3-svn] / common / lfdemod.c

diff --git a/common/lfdemod.c b/common/lfdemod.c
index 665bad89e8d6b5d0b8fd140a687f1329911eb3d4..d6c024fab9bfa872d9a210fa9dfb9334453e6aca 100644 (file)
--- a/common/lfdemod.c
+++ b/common/lfdemod.c
@@ -684,6 +684,19 @@ int VikingDemod_AM(uint8_t *dest, size_t *size) {
        return (int) startIdx;
 }
 
+// find presco preamble 0x10D in already demoded data
+int PrescoDemod(uint8_t *dest, size_t *size) {
+       //make sure buffer has data
+       if (*size < 64*2) return -2;
+
+       size_t startIdx = 0;
+       uint8_t preamble[] = {1,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0};
+       uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx);
+       if (errChk == 0) return -4; //preamble not found
+       //return start position
+       return (int) startIdx;
+}
+
 // Ask/Biphase Demod then try to locate an ISO 11784/85 ID
 // BitStream must contain previously askrawdemod and biphasedemoded data
 int FDXBdemodBI(uint8_t *dest, size_t *size)