aimeio: Factor out emulated reader assembly app logic

aimeio/aimeio.c

@@ -0,0 +1,96 @@
+#include <windows.h>
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "aimeio/aimeio.h"
+
+#include "util/crc.h"
+#include "util/dprintf.h"
+
+static const char aime_io_path[] = "DEVICE\\aime.txt";
+
+static uint8_t aime_io_luid[10];
+
+HRESULT aime_io_init(void)
+{
+    return S_OK;
+}
+
+void aime_io_fini(void)
+{
+}
+
+HRESULT aime_io_mifare_poll(uint8_t unit_no, uint32_t *uid)
+{
+    HRESULT hr;
+    FILE *f;
+    size_t i;
+    int byte;
+    int r;
+
+    if (unit_no != 0) {
+        return S_FALSE;
+    }
+
+    hr = S_FALSE;
+    f = NULL;
+
+    if (!(GetAsyncKeyState(VK_RETURN) & 0x8000)) {
+        goto end;
+    }
+
+    f = fopen(aime_io_path, "r");
+
+    if (f == NULL) {
+        dprintf("Aime DLL: Failed to open %s\n", aime_io_path);
+
+        goto end;
+    }
+
+    for (i = 0 ; i < sizeof(aime_io_luid) ; i++) {
+        r = fscanf(f, "%02x ", &byte);
+
+        if (r != 1) {
+            dprintf("Aime DLL: fscanf[%i] failed: %i\n", (int) i, r);
+
+            goto end;
+        }
+
+        aime_io_luid[i] = byte;
+    }
+
+    /* NOTE: We are just arbitrarily using the CRC32 of the LUID here, real
+       cards do not work like this! However, neither the application code nor
+       the network protocol care what the UID is, it just has to be a stable
+       unique identifier for over-the-air NFC communications. */
+
+    *uid = crc32(aime_io_luid, sizeof(aime_io_luid), 0);
+
+    hr = S_OK;
+
+end:
+    if (f != NULL) {
+        fclose(f);
+    }
+
+    return hr;
+}
+
+HRESULT aime_io_mifare_read_luid(
+        uint8_t unit_no,
+        uint32_t uid,
+        uint8_t *luid,
+        size_t luid_size)
+{
+    assert(luid != NULL);
+    assert(luid_size == sizeof(aime_io_luid));
+
+    memcpy(luid, aime_io_luid, luid_size);
+
+    return S_OK;
+}
+
+void aime_io_led_set_color(uint8_t unit_no, uint8_t r, uint8_t g, uint8_t b)
+{}

aimeio/aimeio.def

@@ -0,0 +1,8 @@
+LIBRARY aimeio
+
+EXPORTS
+    aime_io_fini
+    aime_io_init
+    aime_io_led_set_color
+    aime_io_mifare_poll
+    aime_io_mifare_read_luid

aimeio/aimeio.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <windows.h>
+
+#include <stddef.h>
+#include <stdint.h>
+
+HRESULT aime_io_init(void);
+void aime_io_fini(void);
+HRESULT aime_io_mifare_poll(uint8_t unit_no, uint32_t *uid);
+HRESULT aime_io_mifare_read_luid(
+        uint8_t unit_no,
+        uint32_t uid,
+        uint8_t *luid,
+        size_t luid_size);
+void aime_io_led_set_color(uint8_t unit_no, uint8_t r, uint8_t g, uint8_t b);

aimeio/meson.build

@@ -0,0 +1,17 @@
+aimeio_dll = shared_library(
+    'aimeio',
+    name_prefix : '',
+    include_directories: inc,
+    implicit_include_directories : false,
+    vs_module_defs : 'aimeio.def',
+    c_pch : [
+        '../precompiled.c',
+        '../precompiled.h',
+    ],
+    link_with : [
+        util_lib,
+    ],
+    sources : [
+        'aimeio.c',
+    ],
+)