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Added base64 Print.cpp #583

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Added base64 Print.cpp 
Added  base64 encode decode function
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@toaha63
toaha63 authored Dec 27, 2024
commit 49952f5a53908668ff10f6cfb65b01d4d0e5e478
141 changes: 141 additions & 0 deletions cores/arduino/Print.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -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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