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godot/core/io/pck_packer.cpp

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/*************************************************************************/
/* pck_packer.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#include "pck_packer.h"
#include "core/crypto/crypto_core.h"
#include "core/io/file_access_encrypted.h"
#include "core/io/file_access_pack.h" // PACK_HEADER_MAGIC, PACK_FORMAT_VERSION
#include "core/os/file_access.h"
#include "core/version.h"
static int _get_pad(int p_alignment, int p_n) {
int rest = p_n % p_alignment;
int pad = 0;
if (rest > 0) {
pad = p_alignment - rest;
}
return pad;
}
void PCKPacker::_bind_methods() {
ClassDB::bind_method(D_METHOD("pck_start", "pck_name", "alignment", "key", "encrypt_directory"), &PCKPacker::pck_start, DEFVAL(0), DEFVAL(String()), DEFVAL(false));
ClassDB::bind_method(D_METHOD("add_file", "pck_path", "source_path", "encrypt"), &PCKPacker::add_file, DEFVAL(false));
ClassDB::bind_method(D_METHOD("flush", "verbose"), &PCKPacker::flush, DEFVAL(false));
}
Error PCKPacker::pck_start(const String &p_file, int p_alignment, const String &p_key, bool p_encrypt_directory) {
ERR_FAIL_COND_V_MSG((p_key.is_empty() || !p_key.is_valid_hex_number(false) || p_key.length() != 64), ERR_CANT_CREATE, "Invalid Encryption Key (must be 64 characters long).");
String _key = p_key.to_lower();
key.resize(32);
for (int i = 0; i < 32; i++) {
int v = 0;
if (i * 2 < _key.length()) {
char32_t ct = _key[i * 2];
if (ct >= '0' && ct <= '9') {
ct = ct - '0';
} else if (ct >= 'a' && ct <= 'f') {
ct = 10 + ct - 'a';
}
v |= ct << 4;
}
if (i * 2 + 1 < _key.length()) {
char32_t ct = _key[i * 2 + 1];
if (ct >= '0' && ct <= '9') {
ct = ct - '0';
} else if (ct >= 'a' && ct <= 'f') {
ct = 10 + ct - 'a';
}
v |= ct;
}
key.write[i] = v;
}
enc_dir = p_encrypt_directory;
if (file != nullptr) {
memdelete(file);
}
file = FileAccess::open(p_file, FileAccess::WRITE);
ERR_FAIL_COND_V_MSG(!file, ERR_CANT_CREATE, "Can't open file to write: " + String(p_file) + ".");
alignment = p_alignment;
file->store_32(PACK_HEADER_MAGIC);
file->store_32(PACK_FORMAT_VERSION);
file->store_32(VERSION_MAJOR);
file->store_32(VERSION_MINOR);
file->store_32(VERSION_PATCH);
uint32_t pack_flags = 0;
if (enc_dir) {
pack_flags |= PACK_DIR_ENCRYPTED;
}
file->store_32(pack_flags); // flags
files.clear();
ofs = 0;
return OK;
}
Error PCKPacker::add_file(const String &p_file, const String &p_src, bool p_encrypt) {
FileAccess *f = FileAccess::open(p_src, FileAccess::READ);
if (!f) {
return ERR_FILE_CANT_OPEN;
}
File pf;
pf.path = p_file;
pf.src_path = p_src;
pf.ofs = ofs;
pf.size = f->get_len();
Vector<uint8_t> data = FileAccess::get_file_as_array(p_src);
{
unsigned char hash[16];
CryptoCore::md5(data.ptr(), data.size(), hash);
pf.md5.resize(16);
for (int i = 0; i < 16; i++) {
pf.md5.write[i] = hash[i];
}
}
pf.encrypted = p_encrypt;
uint64_t _size = pf.size;
if (p_encrypt) { // Add encryption overhead.
if (_size % 16) { // Pad to encryption block size.
_size += 16 - (_size % 16);
}
_size += 16; // hash
_size += 8; // data size
_size += 16; // iv
}
int pad = _get_pad(alignment, ofs + _size);
ofs = ofs + _size + pad;
files.push_back(pf);
f->close();
memdelete(f);
return OK;
}
Error PCKPacker::flush(bool p_verbose) {
ERR_FAIL_COND_V_MSG(!file, ERR_INVALID_PARAMETER, "File must be opened before use.");
int64_t file_base_ofs = file->get_position();
file->store_64(0); // files base
for (int i = 0; i < 16; i++) {
file->store_32(0); // reserved
}
// write the index
file->store_32(files.size());
FileAccessEncrypted *fae = nullptr;
FileAccess *fhead = file;
if (enc_dir) {
fae = memnew(FileAccessEncrypted);
ERR_FAIL_COND_V(!fae, ERR_CANT_CREATE);
Error err = fae->open_and_parse(file, key, FileAccessEncrypted::MODE_WRITE_AES256, false);
ERR_FAIL_COND_V(err != OK, ERR_CANT_CREATE);
fhead = fae;
}
for (int i = 0; i < files.size(); i++) {
int string_len = files[i].path.utf8().length();
int pad = _get_pad(4, string_len);
fhead->store_32(string_len + pad);
fhead->store_buffer((const uint8_t *)files[i].path.utf8().get_data(), string_len);
for (int j = 0; j < pad; j++) {
fhead->store_8(0);
}
fhead->store_64(files[i].ofs);
fhead->store_64(files[i].size); // pay attention here, this is where file is
fhead->store_buffer(files[i].md5.ptr(), 16); //also save md5 for file
uint32_t flags = 0;
if (files[i].encrypted) {
flags |= PACK_FILE_ENCRYPTED;
}
fhead->store_32(flags);
}
if (fae) {
fae->release();
memdelete(fae);
}
int header_padding = _get_pad(alignment, file->get_position());
for (int i = 0; i < header_padding; i++) {
file->store_8(Math::rand() % 256);
}
int64_t file_base = file->get_position();
file->seek(file_base_ofs);
file->store_64(file_base); // update files base
file->seek(file_base);
const uint32_t buf_max = 65536;
uint8_t *buf = memnew_arr(uint8_t, buf_max);
int count = 0;
for (int i = 0; i < files.size(); i++) {
FileAccess *src = FileAccess::open(files[i].src_path, FileAccess::READ);
uint64_t to_write = files[i].size;
fae = nullptr;
FileAccess *ftmp = file;
if (files[i].encrypted) {
fae = memnew(FileAccessEncrypted);
ERR_FAIL_COND_V(!fae, ERR_CANT_CREATE);
Error err = fae->open_and_parse(file, key, FileAccessEncrypted::MODE_WRITE_AES256, false);
ERR_FAIL_COND_V(err != OK, ERR_CANT_CREATE);
ftmp = fae;
}
while (to_write > 0) {
int read = src->get_buffer(buf, MIN(to_write, buf_max));
ftmp->store_buffer(buf, read);
to_write -= read;
}
if (fae) {
fae->release();
memdelete(fae);
}
int pad = _get_pad(alignment, file->get_position());
for (int j = 0; j < pad; j++) {
file->store_8(Math::rand() % 256);
}
src->close();
memdelete(src);
count += 1;
const int file_num = files.size();
if (p_verbose && (file_num > 0)) {
if (count % 100 == 0) {
printf("%i/%i (%.2f)\r", count, file_num, float(count) / file_num * 100);
fflush(stdout);
}
}
}
if (p_verbose) {
printf("\n");
}
file->close();
memdelete_arr(buf);
return OK;
}
PCKPacker::~PCKPacker() {
if (file != nullptr) {
memdelete(file);
}
file = nullptr;
}
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