Add code

README.md

@@ -0,0 +1,15 @@
+# Flipper zero wiegand plugin
+
+Add as git submodule
+
+
+Add to your `applicaiton.fam`
+```
+App(
+    appid="plugin_wiegand",
+    apptype=FlipperAppType.PLUGIN,
+    entry_point="plugin_wiegand_ep",
+    requires=["seader"],
+    sources=["plugin/wiegand.c"],
+)
+```

interface.h

@@ -0,0 +1,20 @@
+/**
+ * @file plugin_interface.h
+ * @brief Example plugin interface.
+ *
+ * Common interface between a plugin and host application
+ */
+#pragma once
+
+#include <stdint.h>
+#include <stddef.h>
+#include <furi.h>
+
+#define PLUGIN_APP_ID "plugin_wiegand"
+#define PLUGIN_API_VERSION 1
+
+typedef struct {
+    const char* name;
+    int (*count)(uint8_t, uint64_t);
+    void (*description)(uint8_t, uint64_t, size_t, FuriString*);
+} PluginWiegand;

wiegand.c

@@ -0,0 +1,151 @@
+
+#include "interface.h"
+
+#include <lib/bit_lib/bit_lib.h>
+#include <flipper_application/flipper_application.h>
+
+/*
+ * Huge thanks to the proxmark codebase:
+ * https://github.com/RfidResearchGroup/proxmark3/blob/master/client/src/wiegand_formats.c
+ */
+
+// Structure for packed wiegand messages
+// Always align lowest value (last transmitted) bit to ordinal position 0 (lowest valued bit bottom)
+typedef struct {
+    uint8_t Length; // Number of encoded bits in wiegand message (excluding headers and preamble)
+    uint32_t Top; // Bits in x<<64 positions
+    uint32_t Mid; // Bits in x<<32 positions
+    uint32_t Bot; // Lowest ordinal positions
+} wiegand_message_t;
+
+static inline uint8_t oddparity32(uint32_t x) {
+    return bit_lib_test_parity_32(x, BitLibParityOdd);
+}
+
+static inline uint8_t evenparity32(uint32_t x) {
+    return bit_lib_test_parity_32(x, BitLibParityEven);
+}
+
+static int wiegand_C1k35s_parse(uint8_t bit_length, uint64_t bits, FuriString* description) {
+    if(bit_length != 35) {
+        return 0;
+    }
+
+    wiegand_message_t value;
+    value.Mid = bits >> 32;
+    value.Bot = bits;
+    wiegand_message_t* packed = &value;
+
+    uint32_t cn = (packed->Bot >> 1) & 0x000FFFFF;
+    uint32_t fc = ((packed->Mid & 1) << 11) | ((packed->Bot >> 21));
+    bool valid = (evenparity32((packed->Mid & 0x1) ^ (packed->Bot & 0xB6DB6DB6)) ==
+                  ((packed->Mid >> 1) & 1)) &&
+                 (oddparity32((packed->Mid & 0x3) ^ (packed->Bot & 0x6DB6DB6C)) ==
+                  ((packed->Bot >> 0) & 1)) &&
+                 (oddparity32((packed->Mid & 0x3) ^ (packed->Bot & 0xFFFFFFFF)) ==
+                  ((packed->Mid >> 2) & 1));
+
+    if(valid) {
+        furi_string_cat_printf(description, "C1k35s\nFC: %ld CN: %ld\n", fc, cn);
+        return 1;
+    }
+
+    return 0;
+}
+
+static int wiegand_h10301_parse(uint8_t bit_length, uint64_t bits, FuriString* description) {
+    if(bit_length != 26) {
+        return 0;
+    }
+
+    //E XXXX XXXX XXXX
+    //XXXX XXXX XXXX O
+    uint32_t eBitMask = 0x02000000;
+    uint32_t oBitMask = 0x00000001;
+    uint32_t eParityMask = 0x01FFE000;
+    uint32_t oParityMask = 0x00001FFE;
+    uint8_t eBit = (eBitMask & bits) >> 25;
+    uint8_t oBit = (oBitMask & bits) >> 0;
+
+    bool eParity = bit_lib_test_parity_32((bits & eParityMask) >> 13, BitLibParityEven) &&
+                   eBit == 1;
+    bool oParity = bit_lib_test_parity_32((bits & oParityMask) >> 1, BitLibParityOdd) && oBit == 1;
+
+    FURI_LOG_D(
+        PLUGIN_APP_ID,
+        "eBit: %d, oBit: %d, eParity: %d, oParity: %d",
+        eBit,
+        oBit,
+        eParity,
+        oParity);
+
+    if(eParity && oParity) {
+        uint32_t cnMask = 0x1FFFE;
+        uint16_t cn = ((bits & cnMask) >> 1);
+
+        uint32_t fcMask = 0x1FE0000;
+        uint16_t fc = ((bits & fcMask) >> 17);
+
+        furi_string_cat_printf(description, "H10301\nFC: %d CN: %d\n", fc, cn);
+        return 1;
+    }
+
+    return 0;
+}
+
+static int wiegand_format_count(uint8_t bit_length, uint64_t bits) {
+    UNUSED(bit_length);
+    UNUSED(bits);
+    int count = 0;
+    FuriString* ignore = furi_string_alloc();
+
+    count += wiegand_h10301_parse(bit_length, bits, ignore);
+    count += wiegand_C1k35s_parse(bit_length, bits, ignore);
+
+    furi_string_free(ignore);
+
+    FURI_LOG_I(PLUGIN_APP_ID, "count: %i", count);
+    return count;
+}
+
+static void wiegand_format_description(
+    uint8_t bit_length,
+    uint64_t bits,
+    size_t index,
+    FuriString* description) {
+    FURI_LOG_I(PLUGIN_APP_ID, "description %d", index);
+    UNUSED(bit_length);
+    UNUSED(bits);
+
+    size_t i = 0;
+
+    i += wiegand_h10301_parse(bit_length, bits, description);
+    if(i - 1 == index) {
+        return;
+    }
+    i += wiegand_C1k35s_parse(bit_length, bits, description);
+    if(i - 1 == index) {
+        return;
+    }
+
+    furi_string_cat_printf(description, "[%i] <name> FC: CN:", index);
+}
+
+/* Actual implementation of app<>plugin interface */
+static const PluginWiegand plugin_wiegand = {
+    .name = "Plugin Wiegand",
+    .count = &wiegand_format_count,
+    .description = &wiegand_format_description,
+};
+
+/* Plugin descriptor to comply with basic plugin specification */
+static const FlipperAppPluginDescriptor plugin_wiegand_descriptor = {
+    .appid = PLUGIN_APP_ID,
+    .ep_api_version = PLUGIN_API_VERSION,
+    .entry_point = &plugin_wiegand,
+};
+
+/* Plugin entry point - must return a pointer to const descriptor */
+const FlipperAppPluginDescriptor* plugin_wiegand_ep(void) {
+    return &plugin_wiegand_descriptor;
+}