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diff --git a/include/sqfs/block.h b/include/sqfs/block.h
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+/* SPDX-License-Identifier: LGPL-3.0-or-later */
+/*
+ * block.h - This file is part of libsquashfs
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser 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 Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+#ifndef SQFS_BLOCK_H
+#define SQFS_BLOCK_H
+
+#include "sqfs/predef.h"
+
+/**
+ * @file block.h
+ *
+ * @brief Contains the definition of the @ref sqfs_block_t data structure.
+ */
+
+/**
+ * @enum E_SQFS_BLK_FLAGS
+ *
+ * @brief Generic flags that tell the processor what to do with a block and
+ *        flags that the processor sets when it is done with a block.
+ */
+typedef enum {
+	/**
+	 * @brief Only calculate checksum, do NOT compress the data.
+	 */
+	SQFS_BLK_DONT_COMPRESS = 0x0001,
+
+	/**
+	 * @brief Indicates that an equeued block is the first block of a file.
+	 */
+	SQFS_BLK_FIRST_BLOCK = 0x0002,
+
+	/**
+	 * @brief Indicates that an equeued block is the last block of a file.
+	 */
+	SQFS_BLK_LAST_BLOCK = 0x0004,
+
+	/**
+	 * @brief Allign the block on disk to device block size.
+	 *
+	 * If set in combination with @ref SQFS_BLK_FIRST_BLOCK, the output
+	 * file is padded to a multiple of the device block size before writing
+	 * the block.
+	 *
+	 * If used with @ref SQFS_BLK_LAST_BLOCK, the output file is padded
+	 * after writing the block.
+	 */
+	SQFS_BLK_ALLIGN = 0x0008,
+
+	/**
+	 * @brief Indicates that a block is a tail end of a file and the block
+	 *        processor should take care of fragment packing and accounting.
+	 */
+	SQFS_BLK_IS_FRAGMENT = 0x0010,
+
+	/**
+	 * @brief Set by the block processor on fragment blocks that
+	 *        it generates.
+	 */
+	SQFS_BLK_FRAGMENT_BLOCK = 0x4000,
+
+	/**
+	 * @brief Set by compressor worker if the block was actually compressed.
+	 */
+	SQFS_BLK_IS_COMPRESSED = 0x8000,
+
+	/**
+	 * @brief The combination of all flags that are user settable.
+	 */
+	SQFS_BLK_USER_SETTABLE_FLAGS = 0x001F,
+} E_SQFS_BLK_FLAGS;
+
+/**
+ * @struct sqfs_block_t
+ *
+ * @brief Encapsulates a chunk of data to be processed by the block processor.
+ */
+struct sqfs_block_t {
+	/**
+	 * @brief Used internally, existing value is ignored and overwritten
+	 *        when enqueueing a block.
+	 */
+	sqfs_block_t *next;
+
+	/**
+	 * @brief Used internally, existing value is ignored and overwritten
+	 *        when enqueueing a block.
+	 */
+	uint32_t sequence_number;
+
+	/**
+	 * @brief Size of the data area.
+	 */
+	uint32_t size;
+
+	/**
+	 * @brief Checksum of the input data.
+	 */
+	uint32_t checksum;
+
+	/**
+	 * @brief Data block index within the inode.
+	 */
+	uint32_t index;
+
+	/**
+	 * @brief The squashfs inode related to this block.
+	 */
+	sqfs_inode_generic_t *inode;
+
+	/**
+	 * @brief User settable flag field.
+	 *
+	 * A combination of @ref E_SQFS_BLK_FLAGS and custom, user
+	 * settable flags.
+	 */
+	uint32_t flags;
+
+	/**
+	 * @brief Raw data to be processed.
+	 */
+	uint8_t data[];
+};
+
+#endif /* SQFS_BLOCK_H */