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/* SPDX-License-Identifier: GPL-2.0-only */
#include "archive.h"
#include <endian.h>
#include <errno.h>
#include <libgen.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static struct directory *archive;
static void usage(void)
{
printf("Name:\n");
printf(" archive - concatenate files and create an archive\n");
printf("Usage:\n");
printf(" archive archive_name create file0 file1 ...\n");
}
static int get_file_size(const char *file)
{
FILE *fp = fopen(file, "rb");
int size;
if (!fp) {
fprintf(stderr, "Error: failed to open %s\n", file);
return -1;
}
fseek(fp, 0, SEEK_END);
size = ftell(fp);
fclose(fp);
if (size < 0) {
fprintf(stderr, "Error: failed to get file size\n");
return -1;
}
return size;
}
static int set_file_name(const char *path, struct dentry *dest)
{
struct dentry *entry;
char *name, *copy;
uint32_t i;
copy = strdup(path);
name = basename(copy);
/* check name length */
if (strlen(name) > NAME_LENGTH) {
fprintf(stderr, "Error: file name '%s' exceeds %d chars\n",
name, NAME_LENGTH);
free(copy);
return -1;
}
/* check if there is a duplicate name */
entry = get_first_dentry(archive);
for (i = 0; i < archive->count && &entry[i] != dest; i++) {
if (!strncmp(entry[i].name, name, NAME_LENGTH)) {
fprintf(stderr, "Error: duplicate name '%s'\n", name);
free(copy);
return -1;
}
}
/* copy the name to the entry */
strncpy(dest->name, name, NAME_LENGTH);
free(copy);
return 0;
}
/*
* Add a file to the archive in RAM
*
* path: path to the file to be added
* entry: pointer to struct dentry where file header is created
* offset: offset of the file contents from the archive header
*
* return: 0 on success or -1 on error
*/
static int add_file(const char *path, struct dentry *entry, uint32_t offset)
{
FILE *fp;
int size;
if (!path || !*path || !entry) {
fprintf(stderr, "Error: invalid path or entry\n");
return -1;
}
size = get_file_size(path);
if (size < 0)
return -1;
if (offset + size > archive->size) {
fprintf(stderr, "Error: invalid offset or size\n");
return -1;
}
fp = fopen(path, "rb");
if (!fp) {
fprintf(stderr, "Error: failed to open %s (%d: %s)\n",
path, errno, strerror(errno));
return -1;
}
if (fread((char *)archive + offset, sizeof(char), size, fp) != (size_t)size) {
fprintf(stderr, "Error: failed to read %s\n", path);
fclose(fp);
return -1;
}
fclose(fp);
/* set file name*/
if (set_file_name(path, entry))
return -1;
entry->offset = offset;
entry->size = size;
return 0;
}
/*
* Allocate memory for archive
*
* count: number of files to add
* files: pointer to the array of file names
*
* return: 0 on success or -1 on error
*/
static int setup_archive(int count, const char **files)
{
uint32_t size;
int i, s;
size = sizeof(*archive);
for (i = 0; i < count; i++) {
s = get_file_size(files[i]);
if (s < 0)
return -1;
size += sizeof(struct dentry);
size += s;
}
archive = calloc(size, 1);
if (!archive) {
fprintf(stderr, "Error: failed to allocate memory\n");
return -1;
}
/* install magic string */
memcpy(archive->magic, CBAR_MAGIC, sizeof(archive->magic));
archive->version = VERSION;
archive->size = size;
archive->count = count;
printf("Set up archive: size=%d count=%d\n", size, count);
return 0;
}
/*
* Store files in archive
*/
static int archive_files(const char **files)
{
struct dentry *entry;
uint32_t offset;
uint32_t i;
entry = get_first_dentry(archive);
offset = get_first_offset(archive);
for (i = 0; i < archive->count; i++) {
if (add_file(files[i], entry, offset))
return -1;
offset += entry->size;
entry++;
}
return 0;
}
static void convert_endian(void)
{
struct dentry *entry;
uint32_t i;
entry = get_first_dentry(archive);
for (i = 0; i < archive->count; i++) {
entry[i].offset = htole32(entry[i].offset);
entry[i].size = htole32(entry[i].size);
}
archive->version = htole32(archive->version);
archive->size = htole32(archive->size);
archive->count = htole32(archive->count);
}
/*
* Write archive to file
*/
static int output_archive(const char *path)
{
FILE *fp;
convert_endian();
fp = fopen(path, "wb");
if (!fp) {
fprintf(stderr, "Error: failed to open %s\n", path);
fclose(fp);
return -1;
}
if (fwrite(archive, sizeof(char), archive->size, fp) != archive->size) {
fprintf(stderr, "Error: failed to write to %s\n", path);
fclose(fp);
return -1;
}
fclose(fp);
printf("Wrote archive to %s\n", path);
return 0;
}
static int cmd_create(const char *archive_path, int count, const char **files)
{
if (count < 1 || !files) {
fprintf(stderr, "Error: no input files specified\n");
return -1;
}
if (setup_archive(count, files))
return -1;
if (archive_files(files))
return -1;
if (output_archive(archive_path))
return -1;
return 0;
}
int main(int argc, const char *argv[])
{
const char *command;
if (argc < 3) {
fprintf(stderr, "Error: invalid number of arguments\n");
usage();
return -1;
}
command = argv[2];
/* branch by command name */
if (!strncmp(command, "create", sizeof("create"))) {
if (cmd_create(argv[1], argc - 3, &argv[3]))
return -1;
} else {
fprintf(stderr, "Error: invalid command: %s\n", command);
return -1;
}
return 0;
}
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