Add basic zip extraction using libzip

Might crash at random, leak memory, ... but it does work somehow.

c/ton/.vimrc

@@ -1 +1 @@
let g:syntastic_c_include_dirs = ['/usr/include/webkitgtk-4.0']
let g:syntastic_c_include_dirs = ['/usr/include/webkitgtk-4.0', '/usr/include']

c/ton/Makefile

@@ -1,7 +1,8 @@
JSC_CFLAGS = $(shell pkg-config javascriptcoregtk-4.0 --cflags --libs)
LIBZIP_CFLAGS = $(shell pkg-config libzip --cflags --libs)
ton: *.c
	clang $(JSC_CFLAGS) $^ -o $@
	clang $(JSC_CFLAGS) $(LIBZIP_CFLAGS) $^ -o $@
jsc-funcs:
	grep -Rh JS_EXPORT /usr/include/webkitgtk-4.0/JavaScriptCore | sed 's/^JS_EXPORT //' | grep -v '^#' > $@

c/ton/main.c

@@ -5,6 +5,8 @@
#include <JavaScriptCore/JavaScript.h>
#include "zip.h"
#define CONSOLE_LOG_BUF_SIZE 1000
char console_log_buf[CONSOLE_LOG_BUF_SIZE];

c/ton/zip.c

@@ -0,0 +1,57 @@
// Utilities for getting entries from ZIP files.
// 
// Uses libzip, alternatives are minizip (from zlib) and zziplib.
#include <stdio.h>
#include <stdlib.h>
#include "zip.h"
void print_zip_err(char *prefix, zip_t *zip);
char *get_contents_zip(char *path, char *name) {
	zip_t *archive = zip_open(path, ZIP_RDONLY, NULL);
	if (archive == NULL) {
		print_zip_err("zip_open", archive);
		return NULL;
	}
	zip_stat_t stat;
	if (zip_stat(archive, name, 0, &stat) < 0) {
		print_zip_err("zip_stat", archive);
		goto close_archive;
	}
	zip_file_t *f = zip_fopen(archive, name, 0);
	if (f == NULL) {
		print_zip_err("zip_fopen", archive);
		goto close_archive;
	}
	char *buf = malloc(stat.size + 1);
	if (zip_fread(f, buf, stat.size) < 0) {
		print_zip_err("zip_fread", archive);
		goto free_buf;
	}
	buf[stat.size] = '\0';
	zip_fclose(f);
	zip_close(archive);
	return buf;
free_buf:
	free(buf);
close_file:
	zip_fclose(f);
close_archive:
	zip_close(archive);
	return NULL;
}
void print_zip_err(char *prefix, zip_t *zip) {
		zip_error_t *err = zip_get_error(zip);
		printf("%s: %s\n", prefix, zip_error_strerror(err));
		zip_error_fini(err);
}

c/ton/zip.h

@@ -0,0 +1,3 @@
#include <zip.h>
char *get_contents_zip(char *path, char *name);