Task 630: .S File Format

File Format Specifications for the .S File Format

The .S file format is primarily used for assembly language source code files, particularly those intended for the GNU Assembler (GAS). It is a plain text file containing assembly instructions, directives, labels, and comments. The format supports C preprocessor directives (hence the uppercase .S to indicate preprocessing is needed), and the syntax follows the GAS specification, which includes AT&T-style syntax by default (e.g., mov %eax, %ebx). Files are typically encoded in ASCII or UTF-8, with line endings depending on the platform (LF for Unix, CRLF for Windows). There is no binary structure; it's human-readable text. For detailed syntax specifications, refer to the GNU Assembler manual (e.g., sections on directives like .section, .byte, instructions, and symbols).

1. List of all the properties of this file format intrinsic to its file system.

Since .S files are plain text files, they have no unique internal structure beyond text content. The intrinsic properties are standard file system metadata, as provided by the operating system's file system (e.g., ext4 on Linux, NTFS on Windows). These include:

• File name
• File path
• Size (in bytes)
• Permissions (mode, e.g., read/write/execute for owner/group/others)
• Owner UID
• Group GID
• Inode number
• Number of hard links
• Device ID
• Last access time
• Last modification time
• Last status change time
• Creation time (if supported by the file system, e.g., birth time on some systems)

Find two direct download links for files of format .S.

https://raw.githubusercontent.com/torvalds/linux/master/arch/x86/boot/compressed/head_64.S

https://raw.githubusercontent.com/torvalds/linux/master/arch/arm/boot/compressed/head.S

Write a ghost blog embedded html javascript that allows a user to drag n drop a file of format .S and it will dump to screen all these properties.

1. Write a python class that can open any file of format .S and decode read and write and print to console all the properties from the above list.

import os
import time
import stat

class SFile:
    def __init__(self, filepath):
        self.filepath = filepath
        self.stat = os.stat(filepath)

    def print_properties(self):
        print(f"File name: {os.path.basename(self.filepath)}")
        print(f"File path: {os.path.abspath(self.filepath)}")
        print(f"Size: {self.stat.st_size} bytes")
        print(f"Permissions: {stat.filemode(self.stat.st_mode)}")
        print(f"Owner UID: {self.stat.st_uid}")
        print(f"Group GID: {self.stat.st_gid}")
        print(f"Inode number: {self.stat.st_ino}")
        print(f"Number of hard links: {self.stat.st_nlink}")
        print(f"Device ID: {self.stat.st_dev}")
        print(f"Last access time: {time.ctime(self.stat.st_atime)}")
        print(f"Last modification time: {time.ctime(self.stat.st_mtime)}")
        print(f"Last status change time: {time.ctime(self.stat.st_ctime)}")
        try:
            print(f"Creation time: {time.ctime(os.path.getctime(self.filepath))}")
        except AttributeError:
            print("Creation time: Not supported on this system")

    def read_content(self):
        with open(self.filepath, 'r', encoding='utf-8') as f:
            return f.read()  # Decode as UTF-8 text

    def write_content(self, content):
        with open(self.filepath, 'w', encoding='utf-8') as f:
            f.write(content)  # Write as UTF-8 text

# Example usage:
# s = SFile('example.S')
# s.print_properties()
# content = s.read_content()
# s.write_content(content)

1. Write a java class that can open any file of format .S and decode read and write and print to console all the properties from the above list.

import java.io.*;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.time.Instant;

public class SFile {
    private Path path;
    private BasicFileAttributes attrs;
    private PosixFileAttributes posixAttrs;

    public SFile(String filepath) throws IOException {
        this.path = Paths.get(filepath);
        this.attrs = Files.readAttributes(path, BasicFileAttributes.class);
        try {
            this.posixAttrs = Files.readAttributes(path, PosixFileAttributes.class);
        } catch (UnsupportedOperationException e) {
            this.posixAttrs = null; // POSIX not supported (e.g., Windows)
        }
    }

    public void printProperties() throws IOException {
        System.out.println("File name: " + path.getFileName());
        System.out.println("File path: " + path.toAbsolutePath());
        System.out.println("Size: " + attrs.size() + " bytes");
        if (posixAttrs != null) {
            System.out.println("Permissions: " + PosixFilePermissions.toString(posixAttrs.permissions()));
            System.out.println("Owner: " + posixAttrs.owner().getName());
            System.out.println("Group: " + posixAttrs.group().getName());
            System.out.println("Inode number: " + posixAttrs.fileKey()); // Approximation, as inode may not be directly available
        } else {
            System.out.println("Permissions/Owner/Group/Inode: Not supported on this system (use POSIX-enabled FS)");
        }
        System.out.println("Last access time: " + Instant.ofEpochMilli(attrs.lastAccessTime().toMillis()));
        System.out.println("Last modification time: " + Instant.ofEpochMilli(attrs.lastModifiedTime().toMillis()));
        System.out.println("Last status change time: " + Instant.ofEpochMilli(attrs.lastModifiedTime().toMillis())); // Change time approx as last mod
        System.out.println("Creation time: " + Instant.ofEpochMilli(attrs.creationTime().toMillis()));
    }

    public String readContent() throws IOException {
        return Files.readString(path); // Decode as UTF-8 text
    }

    public void writeContent(String content) throws IOException {
        Files.writeString(path, content); // Write as UTF-8 text
    }

    // Example usage:
    // public static void main(String[] args) throws IOException {
    //     SFile s = new SFile("example.S");
    //     s.printProperties();
    //     String content = s.readContent();
    //     s.writeContent(content);
    // }
}

1. Write a javascript class that can open any file of format .S and decode read and write and print to console all the properties from the above list.

const fs = require('fs');
const path = require('path');

class SFile {
  constructor(filepath) {
    this.filepath = filepath;
    this.stat = fs.statSync(filepath);
  }

  printProperties() {
    console.log(`File name: ${path.basename(this.filepath)}`);
    console.log(`File path: ${path.resolve(this.filepath)}`);
    console.log(`Size: ${this.stat.size} bytes`);
    console.log(`Permissions: ${this.stat.mode.toString(8)}`);
    console.log(`Owner UID: ${this.stat.uid}`);
    console.log(`Group GID: ${this.stat.gid}`);
    console.log(`Inode number: ${this.stat.ino}`);
    console.log(`Number of hard links: ${this.stat.nlink}`);
    console.log(`Device ID: ${this.stat.dev}`);
    console.log(`Last access time: ${this.stat.atime}`);
    console.log(`Last modification time: ${this.stat.mtime}`);
    console.log(`Last status change time: ${this.stat.ctime}`);
    console.log(`Creation time: ${this.stat.birthtime}`);
  }

  readContent() {
    return fs.readFileSync(this.filepath, 'utf8'); // Decode as UTF-8 text
  }

  writeContent(content) {
    fs.writeFileSync(this.filepath, content, 'utf8'); // Write as UTF-8 text
  }
}

// Example usage:
// const s = new SFile('example.S');
// s.printProperties();
// const content = s.readContent();
// s.writeContent(content);

1. Write a c class that can open any file of format .S and decode read and write and print to console all the properties from the above list.

#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <time.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>

struct SFile {
    char *filepath;
    struct stat statbuf;
};

struct SFile* SFile_create(const char *filepath) {
    struct SFile *s = malloc(sizeof(struct SFile));
    s->filepath = strdup(filepath);
    if (stat(filepath, &s->statbuf) != 0) {
        perror("stat");
        free(s->filepath);
        free(s);
        return NULL;
    }
    return s;
}

void SFile_destroy(struct SFile *s) {
    free(s->filepath);
    free(s);
}

void SFile_print_properties(struct SFile *s) {
    char *filename = strrchr(s->filepath, '/');
    filename = filename ? filename + 1 : s->filepath;
    printf("File name: %s\n", filename);
    printf("File path: %s\n", realpath(s->filepath, NULL));
    printf("Size: %ld bytes\n", s->statbuf.st_size);
    printf("Permissions: %o\n", s->statbuf.st_mode & 0777);
    printf("Owner UID: %d\n", s->statbuf.st_uid);
    printf("Group GID: %d\n", s->statbuf.st_gid);
    printf("Inode number: %ld\n", s->statbuf.st_ino);
    printf("Number of hard links: %ld\n", s->statbuf.st_nlink);
    printf("Device ID: %ld\n", s->statbuf.st_dev);
    printf("Last access time: %s", ctime(&s->statbuf.st_atime));
    printf("Last modification time: %s", ctime(&s->statbuf.st_mtime));
    printf("Last status change time: %s", ctime(&s->statbuf.st_ctime));
#ifdef __APPLE__
    printf("Creation time: %s", ctime(&s->statbuf.st_birthtime));
#else
    printf("Creation time: Not supported on this system\n");
#endif
}

char* SFile_read_content(struct SFile *s) {
    FILE *f = fopen(s->filepath, "r");
    if (!f) {
        perror("fopen");
        return NULL;
    }
    fseek(f, 0, SEEK_END);
    long size = ftell(f);
    fseek(f, 0, SEEK_SET);
    char *content = malloc(size + 1);
    fread(content, 1, size, f);
    content[size] = '\0';
    fclose(f);
    return content;
}

int SFile_write_content(struct SFile *s, const char *content) {
    FILE *f = fopen(s->filepath, "w");
    if (!f) {
        perror("fopen");
        return -1;
    }
    fputs(content, f);
    fclose(f);
    return 0;
}

// Example usage:
// int main() {
//     struct SFile *s = SFile_create("example.S");
//     if (s) {
//         SFile_print_properties(s);
//         char *content = SFile_read_content(s);
//         if (content) {
//             SFile_write_content(s, content);
//             free(content);
//         }
//         SFile_destroy(s);
//     }
//     return 0;
// }