From 49952f5a53908668ff10f6cfb65b01d4d0e5e478 Mon Sep 17 00:00:00 2001
From: Hasin Israk Toaha <128958545+toaha63@users.noreply.github.com>
Date: Sat, 28 Dec 2024 00:20:32 +0600
Subject: [PATCH] Added base64 Print.cpp
Added base64 encode decode function
---
cores/arduino/Print.cpp | 141 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 141 insertions(+)
diff --git a/cores/arduino/Print.cpp b/cores/arduino/Print.cpp
index 1e4c99a65..5cc0b46fe 100644
--- a/cores/arduino/Print.cpp
+++ b/cores/arduino/Print.cpp
@@ -264,3 +264,144 @@ size_t Print::printFloat(double number, uint8_t digits)
return n;
}
+
+String base64_encode(const String &input)
+{
+ String encoded;
+ int input_length = input.length();
+ int i = 0;
+ uint8_t char_array_3[3];
+ uint8_t char_array_4[4];
+
+ const uint8_t* data = (const uint8_t*)input.c_str();
+
+ while (input_length--)
+ {
+ char_array_3[i++] = *(data++);
+ if (i == 3)
+ {
+ char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+ char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+ char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+ char_array_4[3] = char_array_3[2] & 0x3f;
+
+ for (i = 0; (i < 4); i++)
+ {
+ char c;
+ memcpy_P(&c, &base64_chars[char_array_4[i]], sizeof(char));
+ encoded += c;
+ }
+ i = 0;
+ }
+ }
+
+ if(i)
+ {
+ for (int j = i; j < 3; j++)
+ char_array_3[j] = '\0';
+
+ char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+ char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+ char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+ char_array_4[3] = char_array_3[2] & 0x3f;
+
+ for (int j = 0; (j < i + 1); j++)
+ {
+ char c;
+ memcpy_P(&c, &base64_chars[char_array_4[j]], sizeof(char));
+ encoded += c;
+ }
+
+ while ((i++ < 3))
+ encoded += '=';
+ }
+
+ return encoded;
+}
+
+String base64_decode(const String &input)
+{
+ String decoded;
+ int input_length = input.length();
+ uint8_t char_array_4[4], char_array_3[3];
+ int i = 0, j = 0;
+
+ while (input_length-- && (input[i] != '=') && (isalnum(input[i]) || (input[i] == '+') || (input[i] == '/')))
+ {
+ char_array_4[j++] = input[i];
+ i++;
+ if (j == 4)
+ {
+ for (j = 0; j < 4; j++)
+ {
+ if (char_array_4[j] >= 'A' && char_array_4[j] <= 'Z')
+ {
+ char_array_4[j] -= 'A';
+ } else if (char_array_4[j] >= 'a' && char_array_4[j] <= 'z')
+ {
+ char_array_4[j] -= 'a' - 26;
+ } else if (char_array_4[j] >= '0' && char_array_4[j] <= '9') {
+ char_array_4[j] -= '0' - 52;
+ } else if (char_array_4[j] == '+') {
+ char_array_4[j] = 62;
+ } else if (char_array_4[j] == '/') {
+ char_array_4[j] = 63;
+ } else {
+ char_array_4[j] = 0; // Invalid character
+ }
+ }
+
+ char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+ char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+ char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+ for (j = 0; (j < 3); j++)
+ {
+ decoded += (char)char_array_3[j];
+ }
+ j = 0;
+ }
+ }
+
+ if(j)
+ {
+ for (int k = j; k < 4; k++)
+ {
+ char_array_4[k] = 0;
+ }
+
+ for (int k = 0; k < 4; k++)
+ {
+ if (char_array_4[k] >= 'A' && char_array_4[k] <= 'Z')
+ {
+ char_array_4[k] -= 'A';
+ } else if (char_array_4[k] >= 'a' && char_array_4[k] <= 'z')
+ {
+ char_array_4[k] -= 'a' - 26;
+ } else if (char_array_4[k] >= '0' && char_array_4[k] <= '9')
+ {
+ char_array_4[k] -= '0' - 52;
+ } else if (char_array_4[k] == '+')
+ {
+ char_array_4[k] = 62;
+ } else if (char_array_4[k] == '/')
+ {
+ char_array_4[k] = 63;
+ } else {
+ char_array_4[k] = 0; // Invalid character
+ }
+ }
+
+ char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+ char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+ char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+ for(int k = 0; (k < j - 1); k++)
+ {
+ decoded += (char)char_array_3[k];
+ }
+ }
+
+ return decoded;
+}
+
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