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🚸 ProUI G-code preview, PID plot (#24282)
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| /** | ||
| * Base64 encoder/decoder for arduino repo | ||
| * Uses common web conventions - '+' for 62, '/' for 63, '=' for padding. | ||
| * Note that invalid base64 characters are interpreted as padding. | ||
| * Author: Densaugeo | ||
| * Maintainer: Densaugeo | ||
| * Version: 1.2.1.1 | ||
| * Changed unsigned int to uint16_t for use in the professional Ender 3V2/S1 firmware | ||
| * Url: https://www.arduino.cc/reference/en/libraries/base64/ | ||
| */ | ||
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| #ifndef BASE64_H_INCLUDED | ||
| #define BASE64_H_INCLUDED | ||
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| /* binary_to_base64: | ||
| * Description: | ||
| * Converts a single byte from a binary value to the corresponding base64 character | ||
| * Parameters: | ||
| * v - Byte to convert | ||
| * Returns: | ||
| * ascii code of base64 character. If byte is >= 64, then there is not corresponding base64 character | ||
| * and 255 is returned | ||
| */ | ||
| unsigned char binary_to_base64(unsigned char v); | ||
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| /* base64_to_binary: | ||
| * Description: | ||
| * Converts a single byte from a base64 character to the corresponding binary value | ||
| * Parameters: | ||
| * c - Base64 character (as ascii code) | ||
| * Returns: | ||
| * 6-bit binary value | ||
| */ | ||
| unsigned char base64_to_binary(unsigned char c); | ||
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| /* encode_base64_length: | ||
| * Description: | ||
| * Calculates length of base64 string needed for a given number of binary bytes | ||
| * Parameters: | ||
| * input_length - Amount of binary data in bytes | ||
| * Returns: | ||
| * Number of base64 characters needed to encode input_length bytes of binary data | ||
| */ | ||
| uint16_t encode_base64_length(uint16_t input_length); | ||
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| /* decode_base64_length: | ||
| * Description: | ||
| * Calculates number of bytes of binary data in a base64 string | ||
| * Variant that does not use input_length no longer used within library, retained for API compatibility | ||
| * Parameters: | ||
| * input - Base64-encoded null-terminated string | ||
| * input_length (optional) - Number of bytes to read from input pointer | ||
| * Returns: | ||
| * Number of bytes of binary data in input | ||
| */ | ||
| uint16_t decode_base64_length(unsigned char input[]); | ||
| uint16_t decode_base64_length(unsigned char input[], uint16_t input_length); | ||
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| /* encode_base64: | ||
| * Description: | ||
| * Converts an array of bytes to a base64 null-terminated string | ||
| * Parameters: | ||
| * input - Pointer to input data | ||
| * input_length - Number of bytes to read from input pointer | ||
| * output - Pointer to output string. Null terminator will be added automatically | ||
| * Returns: | ||
| * Length of encoded string in bytes (not including null terminator) | ||
| */ | ||
| uint16_t encode_base64(unsigned char input[], uint16_t input_length, unsigned char output[]); | ||
|
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| /* decode_base64: | ||
| * Description: | ||
| * Converts a base64 null-terminated string to an array of bytes | ||
| * Parameters: | ||
| * input - Pointer to input string | ||
| * input_length (optional) - Number of bytes to read from input pointer | ||
| * output - Pointer to output array | ||
| * Returns: | ||
| * Number of bytes in the decoded binary | ||
| */ | ||
| uint16_t decode_base64(unsigned char input[], unsigned char output[]); | ||
| uint16_t decode_base64(unsigned char input[], uint16_t input_length, unsigned char output[]); | ||
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| unsigned char binary_to_base64(unsigned char v) { | ||
| // Capital letters - 'A' is ascii 65 and base64 0 | ||
| if (v < 26) return v + 'A'; | ||
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| // Lowercase letters - 'a' is ascii 97 and base64 26 | ||
| if (v < 52) return v + 71; | ||
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| // Digits - '0' is ascii 48 and base64 52 | ||
| if (v < 62) return v - 4; | ||
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| // '+' is ascii 43 and base64 62 | ||
| if (v == 62) return '+'; | ||
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| // '/' is ascii 47 and base64 63 | ||
| if (v == 63) return '/'; | ||
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| return 64; | ||
| } | ||
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| unsigned char base64_to_binary(unsigned char c) { | ||
| // Capital letters - 'A' is ascii 65 and base64 0 | ||
| if ('A' <= c && c <= 'Z') return c - 'A'; | ||
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| // Lowercase letters - 'a' is ascii 97 and base64 26 | ||
| if ('a' <= c && c <= 'z') return c - 71; | ||
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| // Digits - '0' is ascii 48 and base64 52 | ||
| if ('0' <= c && c <= '9') return c + 4; | ||
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| // '+' is ascii 43 and base64 62 | ||
| if (c == '+') return 62; | ||
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| // '/' is ascii 47 and base64 63 | ||
| if (c == '/') return 63; | ||
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| return 255; | ||
| } | ||
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| uint16_t encode_base64_length(uint16_t input_length) { | ||
| return (input_length + 2)/3*4; | ||
| } | ||
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| uint16_t decode_base64_length(unsigned char input[]) { | ||
| return decode_base64_length(input, -1); | ||
| } | ||
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| uint16_t decode_base64_length(unsigned char input[], uint16_t input_length) { | ||
| unsigned char *start = input; | ||
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| while (base64_to_binary(input[0]) < 64 && (unsigned char)(input - start) < input_length) { | ||
| ++input; | ||
| } | ||
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| input_length = input - start; | ||
| return input_length/4*3 + (input_length % 4 ? input_length % 4 - 1 : 0); | ||
| } | ||
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| uint16_t encode_base64(unsigned char input[], uint16_t input_length, unsigned char output[]) { | ||
| uint16_t full_sets = input_length/3; | ||
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| // While there are still full sets of 24 bits... | ||
| for (uint16_t i = 0; i < full_sets; ++i) { | ||
| output[0] = binary_to_base64( input[0] >> 2); | ||
| output[1] = binary_to_base64((input[0] & 0x03) << 4 | input[1] >> 4); | ||
| output[2] = binary_to_base64((input[1] & 0x0F) << 2 | input[2] >> 6); | ||
| output[3] = binary_to_base64( input[2] & 0x3F); | ||
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| input += 3; | ||
| output += 4; | ||
| } | ||
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| switch(input_length % 3) { | ||
| case 0: | ||
| output[0] = '\0'; | ||
| break; | ||
| case 1: | ||
| output[0] = binary_to_base64( input[0] >> 2); | ||
| output[1] = binary_to_base64((input[0] & 0x03) << 4); | ||
| output[2] = '='; | ||
| output[3] = '='; | ||
| output[4] = '\0'; | ||
| break; | ||
| case 2: | ||
| output[0] = binary_to_base64( input[0] >> 2); | ||
| output[1] = binary_to_base64((input[0] & 0x03) << 4 | input[1] >> 4); | ||
| output[2] = binary_to_base64((input[1] & 0x0F) << 2); | ||
| output[3] = '='; | ||
| output[4] = '\0'; | ||
| break; | ||
| } | ||
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| return encode_base64_length(input_length); | ||
| } | ||
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| uint16_t decode_base64(unsigned char input[], unsigned char output[]) { | ||
| return decode_base64(input, -1, output); | ||
| } | ||
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| uint16_t decode_base64(unsigned char input[], uint16_t input_length, unsigned char output[]) { | ||
| uint16_t output_length = decode_base64_length(input, input_length); | ||
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| // While there are still full sets of 24 bits... | ||
| for (uint16_t i = 2; i < output_length; i += 3) { | ||
| output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4; | ||
| output[1] = base64_to_binary(input[1]) << 4 | base64_to_binary(input[2]) >> 2; | ||
| output[2] = base64_to_binary(input[2]) << 6 | base64_to_binary(input[3]); | ||
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| input += 4; | ||
| output += 3; | ||
| } | ||
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| switch(output_length % 3) { | ||
| case 1: | ||
| output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4; | ||
| break; | ||
| case 2: | ||
| output[0] = base64_to_binary(input[0]) << 2 | base64_to_binary(input[1]) >> 4; | ||
| output[1] = base64_to_binary(input[1]) << 4 | base64_to_binary(input[2]) >> 2; | ||
| break; | ||
| } | ||
|
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| return output_length; | ||
| } | ||
|
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| #endif // ifndef |
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