godot/core/io/zip_io.cpp

/*************************************************************************/
/*  zip_io.cpp                                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#include "zip_io.h"

void *zipio_open(void *data, const char *p_fname, int mode) {
	FileAccess *&f = *(FileAccess **)data;

	String fname;
	fname.parse_utf8(p_fname);

	if (mode & ZLIB_FILEFUNC_MODE_WRITE) {
		f = FileAccess::open(fname, FileAccess::WRITE);
	} else {
		f = FileAccess::open(fname, FileAccess::READ);
	}

	if (!f) {
		return nullptr;
	}

	return data;
}

uLong zipio_read(void *data, void *fdata, void *buf, uLong size) {
	FileAccess *f = *(FileAccess **)data;
	return f->get_buffer((uint8_t *)buf, size);
}

uLong zipio_write(voidpf opaque, voidpf stream, const void *buf, uLong size) {
	FileAccess *f = *(FileAccess **)opaque;
	f->store_buffer((uint8_t *)buf, size);
	return size;
}

long zipio_tell(voidpf opaque, voidpf stream) {
	FileAccess *f = *(FileAccess **)opaque;
	return f->get_position();
}

long zipio_seek(voidpf opaque, voidpf stream, uLong offset, int origin) {
	FileAccess *f = *(FileAccess **)opaque;

	uint64_t pos = offset;
	switch (origin) {
		case ZLIB_FILEFUNC_SEEK_CUR:
			pos = f->get_position() + offset;
			break;
		case ZLIB_FILEFUNC_SEEK_END:
			pos = f->get_length() + offset;
			break;
		default:
			break;
	}

	f->seek(pos);
	return 0;
}

int zipio_close(voidpf opaque, voidpf stream) {
	FileAccess *&f = *(FileAccess **)opaque;
	if (f) {
		f->close();
		memdelete(f);
		f = nullptr;
	}
	return 0;
}

int zipio_testerror(voidpf opaque, voidpf stream) {
	FileAccess *f = *(FileAccess **)opaque;
	return (f && f->get_error() != OK) ? 1 : 0;
}

voidpf zipio_alloc(voidpf opaque, uInt items, uInt size) {
	voidpf ptr = memalloc((size_t)items * size);
	memset(ptr, 0, items * size);
	return ptr;
}

void zipio_free(voidpf opaque, voidpf address) {
	memfree(address);
}

zlib_filefunc_def zipio_create_io_from_file(FileAccess **p_file) {
	zlib_filefunc_def io;
	io.opaque = p_file;
	io.zopen_file = zipio_open;
	io.zread_file = zipio_read;
	io.zwrite_file = zipio_write;
	io.ztell_file = zipio_tell;
	io.zseek_file = zipio_seek;
	io.zclose_file = zipio_close;
	io.zerror_file = zipio_testerror;
	io.alloc_mem = zipio_alloc;
	io.free_mem = zipio_free;
	return io;
}