add findmy to system apps [ci skip]

autoload by Willy-JL

applications/system/find_my_flipper/helpers/base64.c

@@ -0,0 +1,142 @@
+/*
+ * Base64 encoding/decoding (RFC1341)
+ * Copyright (c) 2005-2011, Jouni Malinen <j@w1.fi>
+ *
+ * This software may be distributed under the terms of the BSD license.
+ * See README for more details.
+ */
+// https://web.mit.edu/freebsd/head/contrib/wpa/src/utils/base64.c
+
+#include "base64.h"
+
+#define os_malloc malloc
+#define os_free   free
+#define os_memset memset
+
+static const unsigned char base64_table[65] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+/**
+ * base64_encode - Base64 encode
+ * @src: Data to be encoded
+ * @len: Length of the data to be encoded
+ * @out_len: Pointer to output length variable, or %NULL if not used
+ * Returns: Allocated buffer of out_len bytes of encoded data,
+ * or %NULL on failure
+ *
+ * Caller is responsible for freeing the returned buffer. Returned buffer is
+ * nul terminated to make it easier to use as a C string. The nul terminator is
+ * not included in out_len.
+ */
+unsigned char* base64_encode(const unsigned char* src, size_t len, size_t* out_len) {
+    unsigned char *out, *pos;
+    const unsigned char *end, *in;
+    size_t olen;
+    int line_len;
+
+    olen = len * 4 / 3 + 4; /* 3-byte blocks to 4-byte */
+    olen += olen / 72; /* line feeds */
+    olen++; /* nul termination */
+    if(olen < len) return NULL; /* integer overflow */
+    out = os_malloc(olen);
+    if(out == NULL) return NULL;
+
+    end = src + len;
+    in = src;
+    pos = out;
+    line_len = 0;
+    while(end - in >= 3) {
+        *pos++ = base64_table[in[0] >> 2];
+        *pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)];
+        *pos++ = base64_table[((in[1] & 0x0f) << 2) | (in[2] >> 6)];
+        *pos++ = base64_table[in[2] & 0x3f];
+        in += 3;
+        line_len += 4;
+        if(line_len >= 72) {
+            *pos++ = '\n';
+            line_len = 0;
+        }
+    }
+
+    if(end - in) {
+        *pos++ = base64_table[in[0] >> 2];
+        if(end - in == 1) {
+            *pos++ = base64_table[(in[0] & 0x03) << 4];
+            *pos++ = '=';
+        } else {
+            *pos++ = base64_table[((in[0] & 0x03) << 4) | (in[1] >> 4)];
+            *pos++ = base64_table[(in[1] & 0x0f) << 2];
+        }
+        *pos++ = '=';
+        line_len += 4;
+    }
+
+    if(line_len) *pos++ = '\n';
+
+    *pos = '\0';
+    if(out_len) *out_len = pos - out;
+    return out;
+}
+
+/**
+ * base64_decode - Base64 decode
+ * @src: Data to be decoded
+ * @len: Length of the data to be decoded
+ * @out_len: Pointer to output length variable
+ * Returns: Allocated buffer of out_len bytes of decoded data,
+ * or %NULL on failure
+ *
+ * Caller is responsible for freeing the returned buffer.
+ */
+unsigned char* base64_decode(const unsigned char* src, size_t len, size_t* out_len) {
+    unsigned char dtable[256], *out, *pos, block[4], tmp;
+    size_t i, count, olen;
+    int pad = 0;
+
+    os_memset(dtable, 0x80, 256);
+    for(i = 0; i < sizeof(base64_table) - 1; i++)
+        dtable[base64_table[i]] = (unsigned char)i;
+    dtable['='] = 0;
+
+    count = 0;
+    for(i = 0; i < len; i++) {
+        if(dtable[src[i]] != 0x80) count++;
+    }
+
+    if(count == 0 || count % 4) return NULL;
+
+    olen = count / 4 * 3;
+    pos = out = os_malloc(olen);
+    if(out == NULL) return NULL;
+
+    count = 0;
+    for(i = 0; i < len; i++) {
+        tmp = dtable[src[i]];
+        if(tmp == 0x80) continue;
+
+        if(src[i] == '=') pad++;
+        block[count] = tmp;
+        count++;
+        if(count == 4) {
+            *pos++ = (block[0] << 2) | (block[1] >> 4);
+            *pos++ = (block[1] << 4) | (block[2] >> 2);
+            *pos++ = (block[2] << 6) | block[3];
+            count = 0;
+            if(pad) {
+                if(pad == 1)
+                    pos--;
+                else if(pad == 2)
+                    pos -= 2;
+                else {
+                    /* Invalid padding */
+                    os_free(out);
+                    return NULL;
+                }
+                break;
+            }
+        }
+    }
+
+    *out_len = pos - out;
+    return out;
+}