How do I convert an image to base64-encoded in esp32?

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i would like to convert an image to Base64-encoded in esp32 cam . already i used method under detail like this : ConvertBase64("D:/ok.jpg","D:/encode_Folder"); but not working (encode_Folder is empty)
void ConvertBase64(String jpgpath, String base64path) {
Process p;
p.begin("/mnt/sda1/base64.sh");
p.addParameter(jpgpath);
p.addParameter(base64path);
p.run();
while(p.running());
}

What I have tried:

maybe another/right way is using method under detail : static String encode(const uint8_t * data, size_t length, bool doNewLines = true); but i dont know how to use above method . would you please help me?

Posted 29-May-21 10:03am

Member 13128846

Updated 3-Aug-21 15:50pm

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James Walsh Jr · Answer 1 · 2021-08-03T15:49:00

I found this blog post article on Base64 encoding on Arduino.

Here is the relevant block of code from the article

size_t size = image.size;
const uint8_t* image = image.data;

uint8_t *buffer = calloc((size + 2 - ((size + 2) % 3)) / 3 * 4 + 1, sizeof(char));
// <--- equation from internet
size_t buff_size = 0;
int err = mbedtls_base64_encode(buffer, (size + 2 - ((size + 2) % 3)) / 3 * 4 + 1,
&buff_size, image, size);
if (err != 0) {
    ESP_LOGE(TAG, "error base64 encoding, error %d, buff size: %d", err, buff_size);
    return; <pre lang="text">

}