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289 lines
9.1 KiB
C++
289 lines
9.1 KiB
C++
/**************************************************************************/
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/* pck_packer.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "pck_packer.h"
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#include "core/crypto/crypto_core.h"
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#include "core/io/file_access.h"
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#include "core/io/file_access_encrypted.h"
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#include "core/io/file_access_pack.h" // PACK_HEADER_MAGIC, PACK_FORMAT_VERSION
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#include "core/version.h"
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static int _get_pad(int p_alignment, int p_n) {
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int rest = p_n % p_alignment;
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int pad = 0;
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if (rest > 0) {
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pad = p_alignment - rest;
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}
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return pad;
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}
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void PCKPacker::_bind_methods() {
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ClassDB::bind_method(D_METHOD("pck_start", "pck_path", "alignment", "key", "encrypt_directory"), &PCKPacker::pck_start, DEFVAL(32), DEFVAL("0000000000000000000000000000000000000000000000000000000000000000"), DEFVAL(false));
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ClassDB::bind_method(D_METHOD("add_file", "target_path", "source_path", "encrypt"), &PCKPacker::add_file, DEFVAL(false));
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ClassDB::bind_method(D_METHOD("add_file_removal", "target_path"), &PCKPacker::add_file_removal);
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ClassDB::bind_method(D_METHOD("flush", "verbose"), &PCKPacker::flush, DEFVAL(false));
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}
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Error PCKPacker::pck_start(const String &p_pck_path, int p_alignment, const String &p_key, bool p_encrypt_directory) {
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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).");
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ERR_FAIL_COND_V_MSG(p_alignment <= 0, ERR_CANT_CREATE, "Invalid alignment, must be greater then 0.");
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String _key = p_key.to_lower();
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key.resize(32);
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for (int i = 0; i < 32; i++) {
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int v = 0;
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if (i * 2 < _key.length()) {
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char32_t ct = _key[i * 2];
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if (is_digit(ct)) {
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ct = ct - '0';
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} else if (ct >= 'a' && ct <= 'f') {
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ct = 10 + ct - 'a';
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}
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v |= ct << 4;
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}
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if (i * 2 + 1 < _key.length()) {
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char32_t ct = _key[i * 2 + 1];
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if (is_digit(ct)) {
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ct = ct - '0';
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} else if (ct >= 'a' && ct <= 'f') {
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ct = 10 + ct - 'a';
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}
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v |= ct;
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}
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key.write[i] = v;
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}
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enc_dir = p_encrypt_directory;
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file = FileAccess::open(p_pck_path, FileAccess::WRITE);
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ERR_FAIL_COND_V_MSG(file.is_null(), ERR_CANT_CREATE, vformat("Can't open file to write: '%s'.", String(p_pck_path)));
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alignment = p_alignment;
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file->store_32(PACK_HEADER_MAGIC);
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file->store_32(PACK_FORMAT_VERSION);
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file->store_32(VERSION_MAJOR);
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file->store_32(VERSION_MINOR);
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file->store_32(VERSION_PATCH);
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uint32_t pack_flags = 0;
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if (enc_dir) {
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pack_flags |= PACK_DIR_ENCRYPTED;
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}
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file->store_32(pack_flags); // flags
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files.clear();
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ofs = 0;
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return OK;
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}
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Error PCKPacker::add_file_removal(const String &p_target_path) {
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ERR_FAIL_COND_V_MSG(file.is_null(), ERR_INVALID_PARAMETER, "File must be opened before use.");
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File pf;
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// Simplify path here and on every 'files' access so that paths that have extra '/'
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// symbols or 'res://' in them still match the MD5 hash for the saved path.
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pf.path = p_target_path.simplify_path().trim_prefix("res://");
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pf.ofs = ofs;
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pf.size = 0;
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pf.removal = true;
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pf.md5.resize(16);
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pf.md5.fill(0);
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files.push_back(pf);
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return OK;
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}
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Error PCKPacker::add_file(const String &p_target_path, const String &p_source_path, bool p_encrypt) {
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ERR_FAIL_COND_V_MSG(file.is_null(), ERR_INVALID_PARAMETER, "File must be opened before use.");
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Ref<FileAccess> f = FileAccess::open(p_source_path, FileAccess::READ);
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if (f.is_null()) {
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return ERR_FILE_CANT_OPEN;
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}
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File pf;
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// Simplify path here and on every 'files' access so that paths that have extra '/'
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// symbols or 'res://' in them still match the MD5 hash for the saved path.
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pf.path = p_target_path.simplify_path().trim_prefix("res://");
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pf.src_path = p_source_path;
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pf.ofs = ofs;
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pf.size = f->get_length();
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Vector<uint8_t> data = FileAccess::get_file_as_bytes(p_source_path);
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{
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unsigned char hash[16];
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CryptoCore::md5(data.ptr(), data.size(), hash);
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pf.md5.resize(16);
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for (int i = 0; i < 16; i++) {
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pf.md5.write[i] = hash[i];
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}
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}
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pf.encrypted = p_encrypt;
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uint64_t _size = pf.size;
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if (p_encrypt) { // Add encryption overhead.
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if (_size % 16) { // Pad to encryption block size.
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_size += 16 - (_size % 16);
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}
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_size += 16; // hash
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_size += 8; // data size
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_size += 16; // iv
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}
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int pad = _get_pad(alignment, ofs + _size);
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ofs = ofs + _size + pad;
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files.push_back(pf);
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return OK;
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}
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Error PCKPacker::flush(bool p_verbose) {
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ERR_FAIL_COND_V_MSG(file.is_null(), ERR_INVALID_PARAMETER, "File must be opened before use.");
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int64_t file_base_ofs = file->get_position();
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file->store_64(0); // files base
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for (int i = 0; i < 16; i++) {
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file->store_32(0); // reserved
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}
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// write the index
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file->store_32(files.size());
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Ref<FileAccessEncrypted> fae;
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Ref<FileAccess> fhead = file;
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if (enc_dir) {
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fae.instantiate();
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ERR_FAIL_COND_V(fae.is_null(), ERR_CANT_CREATE);
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Error err = fae->open_and_parse(file, key, FileAccessEncrypted::MODE_WRITE_AES256, false);
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ERR_FAIL_COND_V(err != OK, ERR_CANT_CREATE);
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fhead = fae;
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}
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for (int i = 0; i < files.size(); i++) {
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int string_len = files[i].path.utf8().length();
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int pad = _get_pad(4, string_len);
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fhead->store_32(string_len + pad);
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fhead->store_buffer((const uint8_t *)files[i].path.utf8().get_data(), string_len);
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for (int j = 0; j < pad; j++) {
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fhead->store_8(0);
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}
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fhead->store_64(files[i].ofs);
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fhead->store_64(files[i].size); // pay attention here, this is where file is
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fhead->store_buffer(files[i].md5.ptr(), 16); //also save md5 for file
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uint32_t flags = 0;
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if (files[i].encrypted) {
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flags |= PACK_FILE_ENCRYPTED;
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}
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if (files[i].removal) {
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flags |= PACK_FILE_REMOVAL;
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}
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fhead->store_32(flags);
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}
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if (fae.is_valid()) {
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fhead.unref();
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fae.unref();
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}
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int header_padding = _get_pad(alignment, file->get_position());
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for (int i = 0; i < header_padding; i++) {
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file->store_8(0);
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}
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int64_t file_base = file->get_position();
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file->seek(file_base_ofs);
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file->store_64(file_base); // update files base
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file->seek(file_base);
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const uint32_t buf_max = 65536;
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uint8_t *buf = memnew_arr(uint8_t, buf_max);
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int count = 0;
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for (int i = 0; i < files.size(); i++) {
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if (files[i].removal) {
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continue;
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}
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Ref<FileAccess> src = FileAccess::open(files[i].src_path, FileAccess::READ);
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uint64_t to_write = files[i].size;
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Ref<FileAccess> ftmp = file;
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if (files[i].encrypted) {
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fae.instantiate();
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ERR_FAIL_COND_V(fae.is_null(), ERR_CANT_CREATE);
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Error err = fae->open_and_parse(file, key, FileAccessEncrypted::MODE_WRITE_AES256, false);
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ERR_FAIL_COND_V(err != OK, ERR_CANT_CREATE);
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ftmp = fae;
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}
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while (to_write > 0) {
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uint64_t read = src->get_buffer(buf, MIN(to_write, buf_max));
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ftmp->store_buffer(buf, read);
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to_write -= read;
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}
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if (fae.is_valid()) {
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ftmp.unref();
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fae.unref();
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}
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int pad = _get_pad(alignment, file->get_position());
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for (int j = 0; j < pad; j++) {
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file->store_8(0);
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}
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count += 1;
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const int file_num = files.size();
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if (p_verbose && (file_num > 0)) {
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print_line(vformat("[%d/%d - %d%%] PCKPacker flush: %s -> %s", count, file_num, float(count) / file_num * 100, files[i].src_path, files[i].path));
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}
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}
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file.unref();
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memdelete_arr(buf);
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return OK;
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}
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