Below is a comprehensive response addressing TASK 053 for the .B64 file format. The response adheres to the formal tone and precise language requested, while following the provided guidelines for generating artifacts. The task involves listing the intrinsic properties of the .B64 file format and creating classes in Python, Java, JavaScript, and C to handle .B64 files, including decoding, reading, writing, and printing the specified properties.

1. Properties of the .B64 File Format Intrinsic to Its File System

The .B64 file format is a binary-to-text encoding scheme that uses Base64 to represent binary data as ASCII text. Based on the provided web results and standard knowledge of Base64 encoding, the intrinsic properties of the .B64 file format relevant to its file system are:

.B64 File Format Properties

The .B64 file format is a Base64-encoded file used to represent binary data in an ASCII text format. Below are the intrinsic properties of the .B64 file format relevant to its file system:

• File Extension: .b64
• Format Type: Binary-to-text encoding scheme using Base64.
• Encoding Characters: Uses a 64-character set (A-Z, a-z, 0-9, +, /) to represent binary data.
• Padding Character: Uses '=' to pad the encoded data to ensure the output length is a multiple of 4.
• MIME Type: application/base64
• Line Length: Typically 76 characters per line (per MIME standards, RFC 2045), though RFC 4648 allows no limit.
• Size Increase: Approximately 33% increase in size compared to the original binary data due to encoding overhead.
• Character Encoding: Output is ASCII text, with each 6-bit binary group mapped to one of the 64 characters.
• File Content: Represents binary data (e.g., images, executables) in a text format suitable for text-based systems.

These properties ensure compatibility with text-based protocols and systems, such as email or web applications.

2. Python Class for Handling .B64 Files

The following Python class can open, decode, read, write, and print the properties of a .B64 file. It uses the base64 module for encoding/decoding and handles file operations.

import base64
import os

class B64FileHandler:
"""A class to handle .B64 file operations, including reading, decoding, writing, and printing properties."""

def __init__(self, filename):
    """Initialize with the .B64 file path."""
    self.filename = filename
    self.properties = {
        "File Extension": ".b64",
        "Format Type": "Binary-to-text encoding scheme using Base64",
        "Encoding Characters": "A-Z, a-z, 0-9, +, /",
        "Padding Character": "=",
        "MIME Type": "application/base64",
        "Line Length": "76 characters per line (MIME), no limit (RFC 4648)",
        "Size Increase": "Approximately 33%",
        "Character Encoding": "ASCII text",
        "File Content": "Represents binary data in text format"
    }

def read_and_decode(self):
    """Read and decode the .B64 file to binary data."""
    try:
        with open(self.filename, 'r') as file:
            encoded_data = file.read()
            decoded_data = base64.b64decode(encoded_data)
            return decoded_data
    except FileNotFoundError:
        raise Exception(f"File {self.filename} not found.")
    except base64.binascii.Error:
        raise Exception("Invalid Base64 data.")

def write(self, data, output_filename):
    """Encode data to Base64 and write to a .B64 file."""
    try:
        encoded_data = base64.b64encode(data).decode('ascii')
        with open(output_filename, 'w') as file:
            file.write(encoded_data)
        print(f"Successfully wrote to {output_filename}")
    except Exception as e:
        raise Exception(f"Error writing to {output_filename}: {str(e)}")

def print_properties(self):
    """Print the intrinsic properties of the .B64 file format."""
    print("Properties of .B64 File Format:")
    for key, value in self.properties.items():
        print(f"{key}: {value}")

Example usage

if name == "main":
# Example: Create a sample .b64 file
sample_data = b"Hello, World!"
handler = B64FileHandler("sample.b64")
handler.write(sample_data, "sample.b64")

# Read and decode the file
decoded = handler.read_and_decode()
print("Decoded data:", decoded.decode('utf-8'))

# Print properties
handler.print_properties()

3. Java Class for Handling .B64 Files

The Java class below uses java.util.Base64 for encoding/decoding and handles file operations for .B64 files.

import java.util.Base64;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Map;
import java.util.LinkedHashMap;

public class B64FileHandler {
private String filename;
private Map<String, String> properties;

public B64FileHandler(String filename) {
    this.filename = filename;
    this.properties = new LinkedHashMap<>();
    initializeProperties();
}

private void initializeProperties() {
    properties.put("File Extension", ".b64");
    properties.put("Format Type", "Binary-to-text encoding scheme using Base64");
    properties.put("Encoding Characters", "A-Z, a-z, 0-9, +, /");
    properties.put("Padding Character", "=");
    properties.put("MIME Type", "application/base64");
    properties.put("Line Length", "76 characters per line (MIME), no limit (RFC 4648)");
    properties.put("Size Increase", "Approximately 33%");
    properties.put("Character Encoding", "ASCII text");
    properties.put("File Content", "Represents binary data in text format");
}

public byte[] readAndDecode() throws Exception {
    try {
        String encodedData = new String(Files.readAllBytes(Paths.get(filename)));
        return Base64.getDecoder().decode(encodedData);
    } catch (Exception e) {
        throw new Exception("Error reading or decoding file: " + e.getMessage());
    }
}

public void write(byte[] data, String outputFilename) throws Exception {
    try {
        String encodedData = Base64.getEncoder().encodeToString(data);
        Files.write(Paths.get(outputFilename), encodedData.getBytes());
        System.out.println("Successfully wrote to " + outputFilename);
    } catch (Exception e) {
        throw new Exception("Error writing to " + outputFilename + ": " + e.getMessage());
    }
}

public void printProperties() {
    System.out.println("Properties of .B64 File Format:");
    for (Map.Entry<String, String> entry : properties.entrySet()) {
        System.out.println(entry.getKey() + ": " + entry.getValue());
    }
}

public static void main(String[] args) {
    try {
        // Example usage
        B64FileHandler handler = new B64FileHandler("sample.b64");
        byte[] sampleData = "Hello, World!".getBytes();
        handler.write(sampleData, "sample.b64");
        byte[] decoded = handler.readAndDecode();
        System.out.println("Decoded data: " + new String(decoded));
        handler.printProperties();
    } catch (Exception e) {
        System.err.println("Error: " + e.getMessage());
    }
}

}

4. JavaScript Class for Handling .B64 Files

The JavaScript class below uses Node.js for file operations and the built-in Buffer class for Base64 encoding/decoding. Note that file system operations require a Node.js environment.

const fs = require('fs');

class B64FileHandler {
    constructor(filename) {
        this.filename = filename;
        this.properties = {
            "File Extension": ".b64",
            "Format Type": "Binary-to-text encoding scheme using Base64",
            "Encoding Characters": "A-Z, a-z, 0-9, +, /",
            "Padding Character": "=",
            "MIME Type": "application/base64",
            "Line Length": "76 characters per line (MIME), no limit (RFC 4648)",
            "Size Increase": "Approximately 33%",
            "Character Encoding": "ASCII text",
            "File Content": "Represents binary data in text format"
        };
    }

    readAndDecode() {
        try {
            const encodedData = fs.readFileSync(this.filename, 'utf8');
            return Buffer.from(encodedData, 'base64').toString('utf8');
        } catch (error) {
            throw new Error(`Error reading or decoding file: ${error.message}`);
        }
    }

    write(data, outputFilename) {
        try {
            const encodedData = Buffer.from(data).toString('base64');
            fs.writeFileSync(outputFilename, encodedData);
            console.log(`Successfully wrote to ${outputFilename}`);
        } catch (error) {
            throw new Error(`Error writing to ${outputFilename}: ${error.message}`);
        }
    }

    printProperties() {
        console.log("Properties of .B64 File Format:");
        for (const [key, value] of Object.entries(this.properties)) {
            console.log(`${key}: ${value}`);
        }
    }
}

// Example usage
if (require.main === module) {
    const handler = new B64FileHandler("sample.b64");
    const sampleData = "Hello, World!";
    handler.write(sampleData, "sample.b64");
    const decoded = handler.readAndDecode();
    console.log("Decoded data:", decoded);
    handler.printProperties();
}

5. C Class for Handling .B64 Files

The C implementation below provides functions to handle .B64 files, including Base64 decoding/encoding and printing properties. Since C does not have classes, we use a struct and associated functions.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Base64 encoding/decoding table
static const char b64_table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static const char *properties[] = {
    "File Extension: .b64",
    "Format Type: Binary-to-text encoding scheme using Base64",
    "Encoding Characters: A-Z, a-z, 0-9, +, /",
    "Padding Character: =",
    "MIME Type: application/base64",
    "Line Length: 76 characters per line (MIME), no limit (RFC 4648)",
    "Size Increase: Approximately 33%",
    "Character Encoding: ASCII text",
    "File Content: Represents binary data in text format"
};

typedef struct {
    const char *filename;
} B64FileHandler;

// Base64 decode function
unsigned char *b64_decode(const char *input, size_t *out_len) {
    size_t len = strlen(input), i, j;
    if (len % 4 != 0) return NULL; // Invalid length
    *out_len = len / 4 * 3;
    if (input[len - 1] == '=') (*out_len)--;
    if (input[len - 2] == '=') (*out_len)--;

    unsigned char *output = malloc(*out_len);
    if (!output) return NULL;

    for (i = 0, j = 0; i < len; i += 4, j += 3) {
        unsigned int val = 0;
        for (int k = 0; k < 4; k++) {
            char c = input[i + k];
            if (c >= 'A' && c <= 'Z') val = (val << 6) | (c - 'A');
            else if (c >= 'a' && c <= 'z') val = (val << 6) | (c - 'a' + 26);
            else if (c >= '0' && c <= '9') val = (val << 6) | (c - '0' + 52);
            else if (c == '+') val = (val << 6) | 62;
            else if (c == '/') val = (val << 6) | 63;
            else if (c == '=') val = val << 6;
        }
        output[j] = (val >> 16) & 0xFF;
        if (j + 1 < *out_len) output[j + 1] = (val >> 8) & 0xFF;
        if (j + 2 < *out_len) output[j + 2] = val & 0xFF;
    }
    return output;
}

// Base64 encode function
char *b64_encode(const unsigned char *input, size_t len) {
    size_t out_len = ((len + 2) / 3) * 4;
    char *output = malloc(out_len + 1);
    if (!output) return NULL;

    size_t i, j;
    for (i = 0, j = 0; i < len; i += 3, j += 4) {
        unsigned int val = (input[i] << 16) | (i + 1 < len ? input[i + 1] << 8 : 0) | (i + 2 < len ? input[i + 2] : 0);
        output[j] = b64_table[(val >> 18) & 0x3F];
        output[j + 1] = b64_table[(val >> 12) & 0x3F];
        output[j + 2] = i + 1 < len ? b64_table[(val >> 6) & 0x3F] : '=';
        output[j + 3] = i + 2 < len ? b64_table[val & 0x3F] : '=';
    }
    output[out_len] = '\0';
    return output;
}

B64FileHandler *b64_file_handler_new(const char *filename) {
    B64FileHandler *handler = malloc(sizeof(B64FileHandler));
    if (handler) handler->filename = filename;
    return handler;
}

void b64_file_handler_free(B64FileHandler *handler) {
    free(handler);
}

unsigned char *b64_file_handler_read_and_decode(B64FileHandler *handler, size_t *out_len) {
    FILE *file = fopen(handler->filename, "r");
    if (!file) {
        fprintf(stderr, "Error: File %s not found.\n", handler->filename);
        return NULL;
    }

    fseek(file, 0, SEEK_END);
    long len = ftell(file);
    fseek(file, 0, SEEK_SET);
    char *encoded_data = malloc(len + 1);
    if (!encoded_data) {
        fclose(file);
        return NULL;
    }

    fread(encoded_data, 1, len, file);
    encoded_data[len] = '\0';
    fclose(file);

    unsigned char *decoded = b64_decode(encoded_data, out_len);
    free(encoded_data);
    return decoded;
}

void b64_file_handler_write(B64FileHandler *handler, const unsigned char *data, size_t len, const char *output_filename) {
    char *encoded_data = b64_encode(data, len);
    if (!encoded_data) {
        fprintf(stderr, "Error: Encoding failed.\n");
        return;
    }

    FILE *file = fopen(output_filename, "w");
    if (!file) {
        fprintf(stderr, "Error: Could not write to %s.\n", output_filename);
        free(encoded_data);
        return;
    }

    fprintf(file, "%s", encoded_data);
    fclose(file);
    free(encoded_data);
    printf("Successfully wrote to %s\n", output_filename);
}

void b64_file_handler_print_properties(B64FileHandler *handler) {
    printf("Properties of .B64 File Format:\n");
    for (int i = 0; i < 9; i++) {
        printf("%s\n", properties[i]);
    }
}

int main() {
    B64FileHandler *handler = b64_file_handler_new("sample.b64");
    const char *sample_data = "Hello, World!";
    b64_file_handler_write(handler, (const unsigned char *)sample_data, strlen(sample_data), "sample.b64");

    size_t decoded_len;
    unsigned char *decoded = b64_file_handler_read_and_decode(handler, &decoded_len);
    if (decoded) {
        printf("Decoded data: %.*s\n", (int)decoded_len, decoded);
        free(decoded);
    }

    b64_file_handler_print_properties(handler);
    b64_file_handler_free(handler);
    return 0;
}

Explanation of Implementation

• Properties List: The properties are derived from web results (e.g., RFC 4648, MIME standards) and describe the .B64 file format's characteristics, such as its extension, character set, and encoding rules. These are presented in a markdown artifact for clarity.
• Python Class: Uses the base64 module for encoding/decoding, with methods to read/decode, write, and print properties. It includes error handling for file operations and invalid Base64 data.
• Java Class: Utilizes java.util.Base64 for encoding/decoding, with file operations via java.nio.file. It follows a similar structure to the Python class, with robust exception handling.
• JavaScript Class: Designed for Node.js, using fs for file operations and Buffer for Base64 handling. It assumes a server-side environment for file access.
• C Implementation: Since C does not support classes, a struct and functions are used. Custom Base64 encoding/decoding functions are implemented, as C lacks a standard Base64 library. Memory management and error handling are included.
• Functionality: Each implementation can read a .B64 file, decode it to binary, write binary data to a .B64 file, and print the format's properties. Example usage is included in each artifact to demonstrate functionality.

The artifacts are wrapped in <xaiArtifact> tags with unique UUIDs, as required, and use appropriate content types (e.g., text/python, text/java). The implementations are designed to be robust, handling errors such as missing files or invalid Base64 data, and are compatible with the .B64 file format specifications.

If you need further clarification or modifications to these implementations, please let me know!