Init

User/lib/base64.c

@@ -0,0 +1,25 @@
+#include "base64.h"
+#include <stdint.h>
+#include <stddef.h>
+
+static const char b64_enc_table[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+int base64_encode(const uint8_t *in, size_t ilen, char *out)
+{
+    size_t out_len = 0;
+    for (size_t i = 0; i < ilen; i += 3) {
+        uint32_t triple = 0;
+        int remain = ilen - i;
+
+        triple |= in[i] << 16;
+        if (remain > 1) triple |= in[i + 1] << 8;
+        if (remain > 2) triple |= in[i + 2];
+
+        out[out_len++] = b64_enc_table[(triple >> 18) & 0x3F];
+        out[out_len++] = b64_enc_table[(triple >> 12) & 0x3F];
+        out[out_len++] = (remain > 1) ? b64_enc_table[(triple >> 6) & 0x3F] : '=';
+        out[out_len++] = (remain > 2) ? b64_enc_table[triple & 0x3F] : '=';
+    }
+    return 0;
+}