WiiUPluginLoaderBackend/source/utils/wiiu_zlib.hpp

119 lines
3.9 KiB
C++

#pragma once
/****************************************************************************
* Copyright (C) 2018-2020 Nathan Strong
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
#include <memory>
#include "elfio/elfio_utils.hpp"
#include "logger.h"
#include "utils.h"
#include <zlib.h>
class wiiu_zlib : public ELFIO::compression_interface {
public:
std::unique_ptr<char[]> inflate(const char *data, const ELFIO::endianess_convertor *convertor, ELFIO::Elf_Xword compressed_size, ELFIO::Elf_Xword &uncompressed_size) const override {
read_uncompressed_size(data, convertor, uncompressed_size);
auto result = make_unique_nothrow<char[]>((uint32_t) (uncompressed_size + 1));
if (result == nullptr) {
return nullptr;
}
int z_ret;
z_stream s = {};
s.zalloc = Z_NULL;
s.zfree = Z_NULL;
s.opaque = Z_NULL;
if (inflateInit_(&s, ZLIB_VERSION, sizeof(s)) != Z_OK) {
return nullptr;
}
s.avail_in = compressed_size - 4;
s.next_in = (Bytef *) data;
s.avail_out = uncompressed_size;
s.next_out = (Bytef *) result.get();
z_ret = ::inflate(&s, Z_FINISH);
inflateEnd(&s);
if (z_ret != Z_OK && z_ret != Z_STREAM_END) {
return nullptr;
}
result[uncompressed_size] = '\0';
return result;
}
std::unique_ptr<char[]> deflate(const char *data, const ELFIO::endianess_convertor *convertor, ELFIO::Elf_Xword decompressed_size, ELFIO::Elf_Xword &compressed_size) const override {
auto result = make_unique_nothrow<char[]>((uint32_t) (decompressed_size));
if (result == nullptr) {
return nullptr;
}
int z_ret;
z_stream s = {};
s.zalloc = Z_NULL;
s.zfree = Z_NULL;
s.opaque = Z_NULL;
if ((z_ret = deflateInit(&s, Z_DEFAULT_COMPRESSION)) != Z_OK) {
return nullptr;
}
s.avail_in = decompressed_size;
s.next_in = (Bytef *) data;
s.avail_out = decompressed_size - 4;
s.next_out = (Bytef *) result.get() + 4;
z_ret = ::deflate(&s, Z_FINISH);
compressed_size = decompressed_size - s.avail_out;
deflateEnd(&s);
if (z_ret != Z_OK && z_ret != Z_STREAM_END) {
compressed_size = 0;
return nullptr;
}
write_compressed_size(result, convertor, compressed_size);
result[compressed_size] = '\0';
return result;
}
private:
static void read_uncompressed_size(const char *&data, const ELFIO::endianess_convertor *convertor, ELFIO::Elf_Xword &uncompressed_size) {
union _int32buffer {
uint32_t word;
char bytes[4];
} int32buffer;
memcpy(int32buffer.bytes, data, 4);
data += 4;
uncompressed_size = (*convertor)(int32buffer.word);
}
static void write_compressed_size(std::unique_ptr<char[]> &result, const ELFIO::endianess_convertor *convertor, ELFIO::Elf_Xword compressed_size) {
union _int32buffer {
uint32_t word;
char bytes[4];
} int32buffer;
int32buffer.word = (*convertor)(compressed_size);
memcpy(result.get(), int32buffer.bytes, 4);
}
};