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/*
* Copyright (C) 2023 Patrick McDermott
*
* This file is part of opkg-opk.
*
* opkg-opk is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* opkg-opk is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with opkg-opk. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include "defs.h"
#include "gzip.h"
#include "ustar.h"
#define OPKG_OPK_MAIN_FILE_BUFFER_SIZE_ 8192
struct _opkg_opk_main_file {
FILE *file;
char buffer[OPKG_OPK_MAIN_FILE_BUFFER_SIZE_];
};
static int
_opkg_opk_main_file_read(void *user_data, char **buffer, size_t *size)
{
struct _opkg_opk_main_file *file = user_data;
*buffer = file->buffer;
*size = fread(file->buffer, 1, OPKG_OPK_MAIN_FILE_BUFFER_SIZE_,
file->file);
if (feof(file->file)) {
return OPKG_OPK_END;
} else if (ferror(file->file) || *size == 0) {
return OPKG_OPK_ERROR;
} else {
return OPKG_OPK_OK;
}
}
static int
_opkg_opk_main_extract(const char *file_name, const char *outer_member,
int (*inner_action)(struct opkg_opk_ustar *))
{
struct _opkg_opk_main_file file;
struct opkg_opk_gzip *outer_gzip;
struct opkg_opk_ustar *outer_ustar;
struct opkg_opk_gzip *inner_gzip;
struct opkg_opk_ustar *inner_ustar;
file.file = fopen(file_name, "rb");
if (file.file == NULL) {
fprintf(stderr, "Error: Failed to open file \"%s\"\n",
file_name);
goto error0;
}
outer_gzip = opkg_opk_gzip_init(&_opkg_opk_main_file_read, &file);
if (outer_gzip == NULL) {
fputs("Error: Failed to initialize\n", stderr);
goto error1;
}
outer_ustar = opkg_opk_ustar_init(outer_gzip);
if (outer_ustar == NULL) {
fputs("Error: Failed to initialize\n", stderr);
goto error2;
}
if (opkg_opk_ustar_seek(outer_ustar, 1, outer_member) != OPKG_OPK_OK) {
fprintf(stderr, "Error: Failed to find \"%s\" in archive\n",
outer_member);
goto error3;
}
inner_gzip = opkg_opk_gzip_init(
(opkg_opk_gzip_read_func *) &opkg_opk_ustar_read,
outer_ustar);
if (inner_gzip == NULL) {
fputs("Error: Failed to initialize\n", stderr);
goto error3;
}
inner_ustar = opkg_opk_ustar_init(inner_gzip);
if (inner_ustar == NULL) {
fputs("Error: Failed to initialize\n", stderr);
goto error4;
}
if (inner_action(inner_ustar) != OPKG_OPK_OK) {
goto error5;
}
opkg_opk_ustar_free(inner_ustar);
opkg_opk_gzip_free(inner_gzip);
opkg_opk_ustar_free(outer_ustar);
opkg_opk_gzip_free(outer_gzip);
fclose(file.file);
return OPKG_OPK_OK;
error5:
opkg_opk_ustar_free(inner_ustar);
error4:
opkg_opk_gzip_free(inner_gzip);
error3:
opkg_opk_ustar_free(outer_ustar);
error2:
opkg_opk_gzip_free(outer_gzip);
error1:
fclose(file.file);
error0:
return OPKG_OPK_ERROR;
}
static int
_opkg_opk_main_read_control(struct opkg_opk_ustar *ustar)
{
char *buffer;
size_t size;
int ret;
if (opkg_opk_ustar_seek(ustar, 2, "control", "./control") !=
OPKG_OPK_OK) {
fputs("Error: Failed to find control file\n", stderr);
return OPKG_OPK_ERROR;
}
while ((ret = opkg_opk_ustar_read(ustar, &buffer, &size)) ==
OPKG_OPK_OK) {
fwrite(buffer, 1, size, stdout);
}
if (ret == OPKG_OPK_ERROR) {
fputs("Error: Failed to read control file\n", stderr);
return OPKG_OPK_ERROR;
}
return OPKG_OPK_OK;
}
static int
_opkg_opk_main_list_members(struct opkg_opk_ustar *ustar)
{
struct opkg_opk_ustar_member member;
int ret;
while ((ret = opkg_opk_ustar_list(ustar, &member)) == OPKG_OPK_OK) {
printf("%11d %s\n", member.size, member.name);
}
if (ret == OPKG_OPK_ERROR) {
fputs("Error: Failed to list data files\n", stderr);
return OPKG_OPK_ERROR;
}
return OPKG_OPK_OK;
}
int
main(int argc, char *argv[])
{
if (_opkg_opk_main_extract(argv[1], "control.tar.gz",
&_opkg_opk_main_read_control) != OPKG_OPK_OK) {
return EXIT_FAILURE;
}
puts("");
if (_opkg_opk_main_extract(argv[1], "data.tar.gz",
&_opkg_opk_main_list_members) != OPKG_OPK_OK) {
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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