archLister.c

#define _GNU_SOURCE //asks stdio.h to include asprintf
#include <archive.h>
#include <archive_entry.h>
#include <stdlib.h>
#include <string.h>
#include "stopif.h"

char* printFileSize(long int size){
	char *fileSize;

	if (size > 1073741824)
		asprintf(&fileSize, "%.2f GB", size/1073741824.0);
	else if (size > 1048576)
		asprintf(&fileSize, "%.2f MB", size/1048576.0);
	else if (size > 1024)
		asprintf(&fileSize, "%.2f KB", size/1024.0);
	else
		asprintf(&fileSize, "%.2f B", size/1.0);

	return fileSize;
}

int readArchive(char const *infile, int details) {
	struct archive *a;
	struct archive_entry *entry;

	a = archive_read_new();
	archive_read_support_filter_all(a);
	archive_read_support_format_all(a);
	Stopif(archive_read_open_filename(a, infile, 10240) != ARCHIVE_OK, return -1, "Can't read archive %s\n", infile);

	if (!details) printf("Calculating...\n");
	size_t totalSize = 0;
	while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
		size_t size = archive_entry_size(entry);

		if (size > 0 && details) {
			char *fileSize = printFileSize(size);
			printf("%s (%s)\n",archive_entry_pathname(entry), fileSize);
			free(fileSize);	
		}
		
		archive_read_data_skip(a);
		totalSize += size;
	}
	Stopif(archive_read_free(a) != ARCHIVE_OK, return -2, "Can't close archive %s\n", infile);
	char *totalPrint = printFileSize(totalSize);
	printf("Total size after unpacking: %s\n", totalPrint);
	free(totalPrint);
	return 0;
}

int main(int argc, char **argv) {
	if (argc < 2)
		printf("Usage: %s <path_to_archive>\nAdd d after path to display details.\n", argv[0]);
	if (argc > 2 && strcmp(argv[2], "d") == 0)
		readArchive(argv[1], 1);
	else if (argc > 1)
		readArchive(argv[1], 0);
}