flycast/core/archive/ZipArchive.cpp

/*
    Created on: Nov 23, 2018

	Copyright 2018 flyinghead

	This file is part of reicast.

    reicast 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 2 of the License, or
    (at your option) any later version.

    reicast 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 reicast.  If not, see <https://www.gnu.org/licenses/>.
 */
#include "ZipArchive.h"

#include <array>

ZipArchive::~ZipArchive()
{
	zip_close(zip);
}

static zip_int64_t ZipSourceCallback(void *userdata, void *data, zip_uint64_t len, zip_source_cmd_t cmd)
{
	using Error = std::array<int, 2>;
	static Error error = {ZIP_ER_OK, 0};
	auto file = static_cast<hostfs::File*>(userdata);

	switch (cmd)
	{
		case ZIP_SOURCE_OPEN:
			return 0;

		case ZIP_SOURCE_READ:
		{
			const auto bytes_read = file->read(data, 1, len);

			if (file->error())
			{
				error = {ZIP_ER_INTERNAL, 0};
				return -1;
			}

			return bytes_read;
		}

		case ZIP_SOURCE_CLOSE:
			return 0;

		case ZIP_SOURCE_STAT:
		{
			auto size = file->size();

			if (size == -1)
			{
				error = {ZIP_ER_INTERNAL, 0};
				return -1;
			}

			auto stat = static_cast<zip_stat_t*>(data);
			zip_stat_init(stat);

			stat->valid |= ZIP_STAT_SIZE;
			stat->size = size;

			return sizeof(*stat);
		}

		case ZIP_SOURCE_ERROR:
		{
			auto error_out = static_cast<std::array<int, 2>*>(data);
			*error_out = error;
			return sizeof(*error_out);
		}

		case ZIP_SOURCE_FREE:
			delete file;
			return 0;

		case ZIP_SOURCE_SEEK:
		{
			zip_error_t error;
			auto seek_info = ZIP_SOURCE_GET_ARGS(zip_source_args_seek, data, len, &error);

			if (seek_info == nullptr)
			{
				error = {ZIP_ER_INTERNAL, 0};
				return -1;
			}

			if (file->seek(seek_info->offset, seek_info->whence) != 0)
			{
				error = {ZIP_ER_INTERNAL, 0};
				return -1;
			}

			return 0;
		}

		case ZIP_SOURCE_TELL:
		{
			const auto position = file->tell();

			if (position == -1)
			{
				error = {ZIP_ER_INTERNAL, 0};
				return -1;
			}

			return position;
		}

		case  ZIP_SOURCE_SUPPORTS:
			return zip_source_make_command_bitmap(
				ZIP_SOURCE_OPEN,
				ZIP_SOURCE_READ,
				ZIP_SOURCE_CLOSE,
				ZIP_SOURCE_STAT,
				ZIP_SOURCE_ERROR,
				ZIP_SOURCE_FREE,
				ZIP_SOURCE_SEEK,
				ZIP_SOURCE_TELL,
				ZIP_SOURCE_SUPPORTS,
				-1
			);

		default:
			break;
	}

	// Unsupported command.
	error = {ZIP_ER_OPNOTSUPP, 0};
	return -1;
}

bool ZipArchive::Open(hostfs::File *file)
{
	zip_error_t error;
	zip_source_t *source = zip_source_function_create(ZipSourceCallback, file, &error);
	if (source == nullptr)
	{
		delete file;
		return false;
	}
	zip = zip_open_from_source(source, 0, nullptr);
	if (zip == nullptr)
		zip_source_free(source);
	return zip != nullptr;
}

ArchiveFile* ZipArchive::OpenFile(const char* name)
{
	zip_file_t *zip_file = zip_fopen(zip, name, 0);
	if (zip_file == nullptr)
		return nullptr;
	zip_stat_t stat;
	zip_stat(zip, name, 0, &stat);
	return new ZipArchiveFile(zip_file, stat.size, stat.name);
}

static zip_file *zip_fopen_by_crc(zip_t *za, u32 crc, int flags, zip_uint64_t& index)
{
	if (crc == 0)
		return nullptr;

	zip_int64_t n = zip_get_num_entries(za, 0);
	for (index = 0; index < (zip_uint64_t)n; index++)
	{
		zip_stat_t stat;
		if (zip_stat_index(za, index, flags, &stat) < -1)
			return nullptr;
		if (stat.crc == crc)
			return zip_fopen_index(za, index, flags);
	}

	return nullptr;
}

ArchiveFile* ZipArchive::OpenFileByCrc(u32 crc)
{
	zip_uint64_t index;
	zip_file_t *zip_file = zip_fopen_by_crc(zip, crc, 0, index);
	if (zip_file == nullptr)
		return nullptr;
	zip_stat_t stat;
	zip_stat_index(zip, index, 0, &stat);

	return new ZipArchiveFile(zip_file, stat.size, stat.name);
}

u32 ZipArchiveFile::Read(void* buffer, u32 length)
{
	return zip_fread(zip_file, buffer, length);
}

bool ZipArchive::Open(const void *data, size_t size)
{
	zip_error_t error;
	zip_source_t *source = zip_source_buffer_create(data, size, 0, &error);
	if (source == nullptr)
		return false;
	zip = zip_open_from_source(source, 0, nullptr);
	if (zip == nullptr)
		zip_source_free(source);
	return zip != nullptr;
}

ArchiveFile *ZipArchive::OpenFirstFile()
{
	zip_file_t *zipFile = zip_fopen_index(zip, 0, 0);
	if (zipFile == nullptr)
		return nullptr;
	zip_stat_t stat;
	zip_stat_index(zip, 0, 0, &stat);
	return new ZipArchiveFile(zipFile, stat.size, stat.name);
}

ArchiveFile *ZipArchive::OpenFileByIndex(size_t index)
{
	zip_file_t *zipFile = zip_fopen_index(zip, index, 0);
	if (zipFile == nullptr)
		return nullptr;
	zip_stat_t stat;
	zip_stat_index(zip, index, 0, &stat);
	return new ZipArchiveFile(zipFile, stat.size, stat.name);
}