cleanup: remove overly excessive comments

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

10 files changed, 229 insertions, 736 deletions

diff --git a/include/compress.h b/include/compress.h
index a8542f2..4c1ec8b 100644
--- a/include/compress.h
+++ b/include/compress.h
@@ -11,86 +11,39 @@
 
 typedef struct compressor_t compressor_t;
 
-/**
- * @struct compressor_t
- *
- * @brief Encapsultes a compressor with a simple interface to compress or
- *        uncompress/extract blocks of data
- */
+/* Encapsultes a compressor with a simple interface to compress or
+   uncompress/extract blocks of data. */
 struct compressor_t {
-	/**
-	 * @brief Write compressor options to the output file if necessary
-	 *
-	 * @param cmp A pointer to the compressor object
-	 * @param fd  The file descriptor to write to
-	 *
-	 * @return The number of bytes written or -1 on failure
-	 */
+	/* Write compressor options to the output file if necessary.
+	   Returns the number of bytes written or -1 on failure.
+	   Internally prints error messages to stderr. */
 	int (*write_options)(compressor_t *cmp, int fd);
 
-	/**
-	 * @brief Read compressor options to the input file
-	 *
-	 * @param cmp A pointer to the compressor object
-	 * @param fd  The file descriptor to write to
-	 *
-	 * @return Zero on success, -1 on failure
-	 */
+	/* Read compressor options to the input file.
+	   Returns zero on success, -1 on failure.
+	   Internally prints error messages to stderr. */
 	int (*read_options)(compressor_t *cmp, int fd);
 
-	/**
-	 * @brief Compress or uncompress a chunk of data
-	 *
-	 * @param cmp     A pointer to the compressor object
-	 * @param in      A pointer to the input buffer
-	 * @param size    The number of bytes in the input buffer to process
-	 * @param out     A pointer to the output buffer
-	 * @param outsize The number of bytes available in the output buffer
-	 *
-	 * @return On success, the number of bytes written to the output
-	 *         buffer, -1 on failure, 0 if the output buffer was too small.
-	 *         The compressor also returns 0 if the compressed result ends
-	 *         up larger than the original input.
-	 */
+	/*
+	  Compress or uncompress a chunk of data.
+
+	  Returns the number of bytes written to the output buffer, -1 on
+	  failure or 0 if the output buffer was too small.
+	  The compressor also returns 0 if the compressed result ends
+	  up larger than the original input.
+
+	  Internally prints compressor specific error messages to stderr.
+	*/
 	ssize_t (*do_block)(compressor_t *cmp, const uint8_t *in, size_t size,
 			    uint8_t *out, size_t outsize);
 
-	/**
-	 * @brief Destroy a compressor object and free up all memory it uses
-	 *
-	 * @param cmp A pointer to the compressor object
-	 */
 	void (*destroy)(compressor_t *stream);
 };
 
-/**
- * @brief Check if a given compressor is available
- *
- * @memberof compressor_t
- *
- * This function checks if a given compressor is available, since some
- * compressors may not be supported yet, or simply disabled in the
- * compile configuration.
- *
- * @param id A SquashFS compressor id
- *
- * @return true if the given compressor is available
- */
 bool compressor_exists(E_SQFS_COMPRESSOR id);
 
-/**
- * @brief Create a compressor object
- *
- * @memberof compressor_t
- *
- * @param id         A SquashFS compressor id
- * @param compress   true if the resulting object should compress data, false
- *                   if it should actually extract already compressed blocks.
- * @param block_size The configured block size for the SquashFS image. May be
- *                   of interest to some compressors.
- *
- * @return A pointer to a new compressor object or NULL on failure.
- */
+/* block_size is the configured block size for the SquashFS image. Needed
+   by some compressors to set internal defaults. */
 compressor_t *compressor_create(E_SQFS_COMPRESSOR id, bool compress,
 				size_t block_size);
 
diff --git a/include/frag_reader.h b/include/frag_reader.h
index 8a3d4cc..623cc8d 100644
--- a/include/frag_reader.h
+++ b/include/frag_reader.h
@@ -8,11 +8,7 @@
 #include <stdint.h>
 #include <stddef.h>
 
-/**
- * @struct frag_reader_t
- *
- * @brief A simple interface for accessing fragments in a SquashFS image
- */
+/* A simple interface for accessing fragments in a SquashFS image */
 typedef struct {
 	sqfs_fragment_t *tbl;
 	size_t num_fragments;
@@ -25,51 +21,26 @@ typedef struct {
 	uint8_t buffer[];
 } frag_reader_t;
 
-/**
- * @brief Create a fragment reader
- *
- * @memberof frag_reader_t
- *
- * This function internally reads and decodes the fragment table from the
- * image and prints error messages to stderr on the way if it fails.
- *
- * @param super A pointer to the SquashFS super block read from the image
- * @param fd    A file descriptor of opened the SquashFS image
- * @param cmp   A pointer to a compressor object to be used for reading meta
- *              data blocks from the image.
- *
- * @return A pointer to a new fragment reader or NULL on failure
- */
+/* Reads and decodes the fragment table from the image. Cleans up after itself
+   and prints error messages to stderr on the way if it fails. */
 frag_reader_t *frag_reader_create(sqfs_super_t *super, int fd,
 				  compressor_t *cmp);
 
-/**
- * @brief Destroy a fragment reader and free all memory it uses
- *
- * @memberof frag_reader_t
- *
- * @param f A pointer to a fragment reader object
- */
 void frag_reader_destroy(frag_reader_t *f);
 
-/**
- * @brief Read tail-end packed data from a fragment
- *
- * @memberof frag_reader_t
- *
- * This function internally takes care of loading and uncompressing the
- * fragment block (which is skipped if it has already been loaded earlier).
- * It prints error messages to stderr on the way if it fails, including such
- * errors as trying to index beyond the fragment table.
- *
- * @param f      A pointer to a fragment reader object
- * @param index  A fragment index such as stored in an inode
- * @param offset A byte offset into the fragment block addressed by the index
- * @param buffer A pointer to a destination buffer to copy decoded data to
- * @param size   The number of bytes to copy into the destination buffer
- *
- * @return Zero on success, -1 on failure
- */
+/*
+  Read data from a fragment.
+
+  The function takes care of loading and uncompressing the fragment block
+  (which is skipped if it has already been loaded earlier).
+
+  `index` is a fragment index from an inode, `offset` is a byte offset into
+  the fragment block and `size` is the number of bytes to copy into the
+  destination buffer.
+
+  Returns 0 on success. Prints error messages to stderr on failure (including
+  index out of bounds).
+*/
 int frag_reader_read(frag_reader_t *f, size_t index, size_t offset,
 		     void *buffer, size_t size);
 
diff --git a/include/fstree.h b/include/fstree.h
index 4986ec2..27cb39d 100644
--- a/include/fstree.h
+++ b/include/fstree.h
@@ -19,238 +19,146 @@ typedef struct dir_info_t dir_info_t;
 typedef struct fstree_t fstree_t;
 typedef struct tree_xattr_t tree_xattr_t;
 
-/**
- * @struct tree_xattr_t
- *
- * @brief Encapsulates a set of key-value pairs attached to a @ref tree_node_t
- */
+/* Encapsulates a set of key-value pairs attached to a tree_node_t */
 struct tree_xattr_t {
+	/* Number of key-value pairs */
 	size_t num_attr;
+
+	/* Total size of the array, i.e. it's capacity */
 	size_t max_attr;
 
+	/* Offset of the meta data block where the pairs are stored */
 	uint64_t block;
+
+	/* Offset into a meta data block where the pairs start */
 	uint32_t offset;
+
+	/* Number of bytes written to disk */
 	uint32_t size;
 
-	/**
-	 * @brief Incremental index within all xattr blocks
-	 */
+	/* Incremental index within all xattr blocks */
 	size_t index;
 
-	/**
-	 * @brief Back reference to the tree node this was created for
-	 */
+	/* Back reference to the tree node this was created for */
 	tree_node_t *owner;
 
-	/**
-	 * @brief linked list pointer of list of attributes in @ref fstree_t
-	 */
+	/* linked list pointer of list of attributes in @ref fstree_t */
 	tree_xattr_t *next;
 
-	/**
-	 * @brief An array with pairs of key-value tupples
-	 *
-	 * Each key-value tupple is encoded as (key << 32) | value.
-	 */
+	/* Array with pairs of key-value tupples.
+	   Each key-value tupple is encoded as (key << 32) | value. */
 	uint64_t ref[];
 };
 
-/**
- * @struct file_info_t
- *
- * @brief Additional meta data stored in a @ref tree_node_t for regular files
- */
+/* Additional meta data stored in a tree_node_t for regular files. */
 struct file_info_t {
+	/* Path to the input file. */
 	char *input_file;
 
-	/**
-	 * @brief Linked list pointer for aggregating fragments
-	 *
-	 * When writing out data blocks, files that don't have a multiple of
-	 * the block size have their tail ends gathered in a fragment block.
-	 * A linked list is used to keep track of which files share the same
-	 * fragment block.
-	 */
+	/* Linked list pointer for aggregating fragments
+
+	   When writing out data blocks, files that don't have a multiple of
+	   the block size have their tail ends gathered in a fragment block.
+	   A linked list is used to keep track of which files share the same
+	   fragment block. */
 	file_info_t *frag_next;
 
-	/**
-	 * @brief Total size of the file in bytes
-	 */
 	uint64_t size;
 
-	/**
-	 * @brief Absolute position of the first data block
-	 */
+	/* Absolute position of the first data block. */
 	uint64_t startblock;
 
-	/**
-	 * @brief Fragment index
-	 *
-	 * If the size is not a multiple of the block size, this holds an
-	 * index into the fragment table.
-	 */
+	/* If the size is not a multiple of the block size, this holds an
+	   index into the fragment table. */
 	uint32_t fragment;
 
-	/**
-	 * @brief Byte offset into the fragment block
-	 *
-	 * If the size is not a multiple of the block size, this holds an
-	 * offset into the fragment block.
-	 */
+	/* Byte offset into the fragment block. */
 	uint32_t fragment_offset;
 
-	/**
-	 * @brief Stores the compressed file block sizes
-	 *
-	 * For each full data block, stores the compressed size. Bit number
-	 * 24 is set if the block is stored uncompressed.
-	 */
+	/* For each full data block, stores the compressed size.
+	   Bit (1 << 24) is set if the block is stored uncompressed. */
 	uint32_t blocksizes[];
 };
 
-/**
- * @struct dir_info_t
- *
- * @brief Additional meta data stored in a @ref tree_node_t for directories
- */
+/* Additional meta data stored in a tree_node_t for directories */
 struct dir_info_t {
-	/**
-	 * @brief Pointer to the head of the linked list of children
-	 */
+	/* Linked list head for children in the directory */
 	tree_node_t *children;
 
-	/**
-	 * @brief Size of the directory
-	 *
-	 * Computed and updated on the fly while writing directory
-	 * meta data to disk.
-	 */
+	/* Size on disk. Computed and updated on the fly while writing
+	   directory meta data to disk. */
 	uint64_t size;
 
-	/**
-	 * @brief Start block offset, relative to directory table start
-	 *
-	 * Offset of the compressed meta data block where the directory
-	 * listing is stored in the SquashFS image.
-	 */
+	/* Start block offset, relative to directory table start. */
 	uint64_t start_block;
 
-	/**
-	 * @brief Byte offset into the uncompressed meta data block
-	 *
-	 * Points at where in the meta data block the directory listing begins.
-	 */
+	/* Byte offset into the uncompressed meta data block. */
 	uint32_t block_offset;
 
-	/**
-	 * @brief Set to true for implicitly generated directories
-	 */
+	/* Set to true for implicitly generated directories.  */
 	bool created_implicitly;
 };
 
-/**
- * @struct tree_node_t
- *
- * @brief A node in a file system tree
- */
+/* A node in a file system tree */
 struct tree_node_t {
-	/**
-	 * @brief Linked list pointer to the next node in the same directory
-	 */
+	/* Parent directory children linked list pointer. */
 	tree_node_t *next;
 
-	/**
-	 * @brief Pointer to directory node that this node is in
-	 *
-	 * This is NULL only for the root node
-	 */
+	/* Root node has this set to NULL. */
 	tree_node_t *parent;
 
-	/**
-	 * @brief Pointer into the payload area where the node name is stored
-	 *
-	 * For the root node, this points to an empty string
-	 */
+	/* For the root node, this points to an empty string. */
 	char *name;
 
-	/**
-	 * @brief A pointer to an extended attribute array or NULL if unused
-	 */
+	/*
+	  A pointer to an extended attribute array or NULL if unused.
+
+	  This field is not stored in-line and taken care of by the generic
+	  fstree cleanup code, since it is generatde after the tree already
+	  exists and shared across multiple nodes.
+	*/
 	tree_xattr_t *xattr;
 
 	uint32_t uid;
 	uint32_t gid;
 	uint16_t mode;
 
-	/**
-	 * @brief SquashFS inode refernce number
-	 *
-	 * This is computed and stored here on the fly when writing inodes
-	 * generated from tree nodes to the SquashFS image.
-	 *
-	 * An inode reference is the 32 bit offset of the compressed meta data
-	 * block, shifted left by 16 and ored with a 13 bit offset into the
-	 * uncompressed meta data block.
-	 */
+	/* SquashFS inode refernce number. 32 bit offset of the meta data
+	   block start (relative to inode table start), shifted left by 16
+	   and ored with a 13 bit offset into the uncompressed meta data block.
+
+	   Generated on the fly when writing inodes. */
 	uint64_t inode_ref;
 
-	/**
-	 * @brief inode number
-	 *
-	 * This is computed and stored here on the fly when writing inodes
-	 * generated from tree nodes to the SquashFS image.
-	 */
+	/* Inode number. Generated on the fly when writing inodes. */
 	uint32_t inode_num;
 
-	/**
-	 * @brief SquashFS inode type used for this tree node
-	 *
-	 * This is computed and stored here on the fly when writing inodes
-	 * generated from tree nodes to the SquashFS image. It can't be
-	 * easily determined in advance since it depends also on the size
-	 * of the node, which means for directories the size of the directory
-	 * entries once written to disk.
-	 *
-	 * All code that actually processes tree nodes should use the mode
-	 * field instead (mode & S_IFMT gives us the node type). It is stored
-	 * here when generating inodes since we need it later on to generate
-	 * directory entries.
-	 */
+	/* SquashFS inode type used for this tree node.
+
+	   Generated on the fly when writing inodes. It can't be easily
+	   determined in advance since it depends also on the size of the
+	   node, which means for directories the size of the directory
+	   entries once written to disk.
+
+	   All code that actually processes tree nodes should use the mode
+	   field instead (mode & S_IFMT gives us the node type). It is stored
+	   here when generating inodes since we need it later on to generate
+	   directory entries.
+	*/
 	int type;
 
+	/* Type specific data. Pointers are into payload area blow. */
 	union {
-		/**
-		 * @brief Pointer into payload area storing directory meta data
-		 */
 		dir_info_t *dir;
-
-		/**
-		 * @brief Pointer into payload area storing file meta data
-		 */
 		file_info_t *file;
-
-		/**
-		 * @brief Pointer into payload area storing symlink target
-		 */
 		char *slink_target;
-
-		/**
-		 * @brief A device number for device special files
-		 */
 		uint64_t devno;
 	} data;
 
-	/**
-	 * @brief Additional data stored in the tree node
-	 */
 	uint8_t payload[];
 };
 
-/**
- * @struct fstree_t
- *
- * @brief Encapsulates a file system tree
- */
+/* Encapsulates a file system tree */
 struct fstree_t {
 	uint32_t default_uid;
 	uint32_t default_gid;
@@ -265,157 +173,81 @@ struct fstree_t {
 	tree_xattr_t *xattr;
 };
 
-/**
- * @brief Initialize an fstree object
- *
- * @memberof fstree_t
- *
- * Initializing means copying over the default values and creating a root node.
- * On error, an error message is written to stderr.
- *
- * @param fs           A pointer to an uninitialized fstree object
- * @param block_size   The data block size for regular files
- * @param mtime        Default modification time stamp to use on all nodes
- * @param default_mode Default permission bits to use on implicitly created
- *                     directories.
- * @param default_uid  Default UID to set on implicitly created directories.
- * @param default_gid  Default GID to set on implicitly created directories.
- *
- * @return Zero on success, -1 on failure
- */
+/*
+  Initializing means copying over the default values and creating a root node.
+  On error, an error message is written to stderr.
+
+  `block_size` is the the data block size for regular files.
+
+  Returns 0 on success.
+*/
 int fstree_init(fstree_t *fs, size_t block_size, uint32_t mtime,
 		uint16_t default_mode, uint32_t default_uid,
 		uint32_t default_gid);
 
-/**
- * @brief Clean up an fstree object and free all memory it uses
- *
- * @memberof fstree_t
- *
- * This function also recursively frees all tree nodes.
- *
- * @param fs A pointer to an fstree object
- */
 void fstree_cleanup(fstree_t *fs);
 
-/**
- * @brief Add a generic node to an fstree object
- *
- * @memberof fstree_t
- *
- * The new node is inserted by path. If some components of the path don't
- * exist, they are created as directories with default permissions, like
- * mkdir -p would, and marked as implcitily created. A subsequent call that
- * tries to create an existing tree node will fail, except if the target
- * is an implicitly created directory node and the call tries to create it
- * as a directory. This will simply overwrite the permissions and ownership.
- * The implicitly created flag is then cleared and subsequent attempts to
- * create this directory again will also fail.
- *
- * This function does not print anything to stderr, instead it sets an
- * appropriate errno value.
- *
- * @param fs        A pointer to an fstree object
- * @param path      The path of the new object to insert
- * @param mode      Specifies both access permission and what kind of node
- *                  to create
- * @param uid       The user id that owns the new node
- * @param gid       The group id that owns the new node
- * @param extra_len An additional number of bytes to allocate for payload data
- *
- * @return A pointer to the new tree node or NULL on failure
- */
+/*
+  Add a generic node to an fstree.
+
+  The new node is inserted by path. If some components of the path don't
+  exist, they are created as directories with default permissions, like
+  mkdir -p would, and marked as implcitily created. A subsequent call that
+  tries to create an existing tree node will fail, except if the target
+  is an implicitly created directory node and the call tries to create it
+  as a directory (this will simply overwrite the permissions and ownership).
+  The implicitly created flag is then cleared. Subsequent attempts to create
+  an existing directory again will then also fail.
+
+  This function does not print anything to stderr, instead it sets an
+  appropriate errno value.
+
+  `extra_len` specifies an additional number of bytes to allocate for payload
+  data in the tree node.
+*/
 tree_node_t *fstree_add(fstree_t *fs, const char *path, uint16_t mode,
 			uint32_t uid, uint32_t gid, size_t extra_len);
 
-/**
- * @brief A wrappter around @ref fstree_add for regular files
- *
- * @memberof fstree_t
- *
- * This function internally computes the number of extra payload bytes
- * requiered and sets up the payload pointers propperly, as they are
- * different than for other types of nodes.
- *
- * @return A pointer to the new tree node or NULL on failure
- */
+/*
+  A wrappter around fstree_add for regular files.
+
+  This function internally computes the number of extra payload bytes
+  requiered and sets up the payload pointers propperly.
+*/
 tree_node_t *fstree_add_file(fstree_t *fs, const char *path, uint16_t mode,
 			     uint32_t uid, uint32_t gid, uint64_t filesz,
 			     const char *input);
 
-/**
- * @brief Add an extended attribute key value pair to a tree node
- *
- * @memberof fstree_t
- *
- * @param fs    A pointer to the fstree object
- * @param node  A pointer to the tree node to attach attributes to
- * @param key   The xattr key with namespace prefix
- * @param value The xattr value string
- *
- * @return Zero on success, -1 on failure (prints error to stderr)
- */
+/*
+  Add an extended attribute key value pair to a tree node.
+
+  Returns 0 on success, prints error to stderr on failure.
+*/
 int fstree_add_xattr(fstree_t *fs, tree_node_t *node,
 		     const char *key, const char *value);
 
-/**
- * @brief Recompute index number of all xattr blocks
- *
- * @memberof fstree_t
- *
- * @param fs A pointer to the fstree object
- */
+/* Recompute running index number of all xattr blocks. */
 void fstree_xattr_reindex(fstree_t *fs);
 
-/**
- * @brief Remove dupliciate xattr listings
- *
- * @memberof fstree_t
- *
- * If two tree nodes have pointers to distinct @ref tree_xattr_t listings that
- * turn out to be equivalent, throw one of the two away and make both nodes
- * point to the same instance.
- */
+/* Sort and dedupliciate xattr blocks, then recumpute the index numbers. */
 void fstree_xattr_deduplicate(fstree_t *fs);
 
-/**
- * @brief Load an fstree from a text file describing it
- *
- * @memberof fstree_t
- *
- * This function parses the file format accepted by gensquashfs and restores
- * a file system tree from it.
- *
- * On failure, an error report with filename and line number is written
- * to stderr.
- *
- * @param fs       A pointer to an fstree object that is already initialized
- *                 prior to calling this function.
- * @param filename The path to the input file to process.
- *
- * @return Zero on success, -1 on failure.
+/*
+  Parses the file format accepted by gensquashfs and produce a file system
+  tree from it.
+
+  On failure, an error report with filename and line number is written
+  to stderr.
+
+  Returns 0 on success.
  */
 int fstree_from_file(fstree_t *fs, const char *filename);
 
-/**
- * @brief Lexicographically sort all directory contents
- *
- * @memberof fstree_t
- *
- * @param fs A pointer to an fstree object
- */
+/* Lexicographically sort all directory contents. */
 void fstree_sort(fstree_t *fs);
 
-/**
- * @brief Add labels from an SELinux labeling file to all tree nodes
- *
- * @memberof fstree_t
- *
- * @param fs       A pointer to an fstree object
- * @param filename The name of the SELinux context file
- *
- * @return Zero on success, -1 on failure
- */
+/* Add labels from an SELinux labeling file to all tree nodes.
+   Returns 0 on success. Internally prints errors to stderr. */
 int fstree_relabel_selinux(fstree_t *fs, const char *filename);
 
 #endif /* FSTREE_H */
diff --git a/include/id_table.h b/include/id_table.h
index 788519c..911c829 100644
--- a/include/id_table.h
+++ b/include/id_table.h
@@ -7,101 +7,35 @@
 
 #include "compress.h"
 
-/**
- * @struct id_table_t
- *
- * @brief Encapsulates the ID table used by SquashFS
- */
+/* Encapsulates the ID table used by SquashFS */
 typedef struct {
-	/**
-	 * @brief Array of unique 32 bit IDs
-	 */
+	/* Array of unique 32 bit IDs */
 	uint32_t *ids;
 
-	/**
-	 * @brief Number of 32 bit IDs stored in the array
-	 */
+	/* Number of 32 bit IDs stored in the array */
 	size_t num_ids;
 
-	/**
-	 * @brief Actual size of the array, i.e. maximum available
-	 */
+	/* Actual size of the array, i.e. maximum available */
 	size_t max_ids;
 } id_table_t;
 
-/**
- * @brief Initialize an ID table
- *
- * @memberof id_table_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param tbl A pointer to an uninitialized ID table
- *
- * @return Zero on success, -1 on failure
- */
+/* Returns 0 on success. Prints error message to stderr on failure. */
 int id_table_init(id_table_t *tbl);
 
-/**
- * @brief Cleanup and free an ID table
- *
- * @memberof id_table_t
- *
- * @param tbl A pointer to an ID table
- */
 void id_table_cleanup(id_table_t *tbl);
 
-/**
- * @brief Resolve a 32 bit to a 16 bit table index
- *
- * @memberof id_table_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param tbl A pointer to an ID table
- * @param id  A 32 bit ID to resolve
- * @param out Returns the 16 bit table index
- *
- * @return Zero on success, -1 on failure
- */
+/* Resolve a 32 bit to a 16 bit table index.
+   Returns 0 on success. Internally prints errors to stderr. */
 int id_table_id_to_index(id_table_t *tbl, uint32_t id, uint16_t *out);
 
-/**
- * @brief Write an ID table to a SquashFS image
- *
- * @memberof id_table_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param tbl   A pointer to an ID table
- * @param outfd A file descriptor to write the data to
- * @param super A pointer to the SquashFS super block to store the ID table
- *              offset in
- * @param cmp   A pointer to the compressor to use for compressing the ID
- *              table meta data blocks
- *
- * @return Zero on success, -1 on failure
- */
+/* Write an ID table to a SquashFS image.
+   Returns 0 on success. Internally prints error message to stderr. */
 int id_table_write(id_table_t *tbl, int outfd, sqfs_super_t *super,
 		   compressor_t *cmp);
 
-/**
- * @brief Read an ID table from a SquashFS image
- *
- * @memberof id_table_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param tbl   A pointer to an ID table
- * @param fd    A file descriptor to read the data from
- * @param super A pointer to the SquashFS super block that tells us where
- *              the ID table is stored
- * @param cmp   A pointer to the compressor to use for extracting the ID
- *              table meta data blocks
- *
- * @return Zero on success, -1 on failure
- */
+/* Read an ID table from a SquashFS image.
+   Returns 0 on success. Internally prints error messages to stderr. */
 int id_table_read(id_table_t *tbl, int fd, sqfs_super_t *super,
-		   compressor_t *cmp);
+		  compressor_t *cmp);
 
 #endif /* ID_TABLE_H */
diff --git a/include/meta_reader.h b/include/meta_reader.h
index a662959..16003f6 100644
--- a/include/meta_reader.h
+++ b/include/meta_reader.h
@@ -7,124 +7,31 @@
 
 typedef struct meta_reader_t meta_reader_t;
 
-/**
- * @brief Create a meta data reader
- *
- * @memberof meta_reader_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param fd  The underlying file descriptor to read from
- * @param cmp A pointer to a compressor to use for extracting the data
- *
- * @return A pointer to a meta data reader, NULL on failure
- */
+/* Create a meta data reader using a given compressor to extract data.
+   Internally prints error message to stderr on failure. */
 meta_reader_t *meta_reader_create(int fd, compressor_t *cmp);
 
-/**
- * @brief Destroy a meta data reader and free all memory used by it
- *
- * @memberof meta_reader_t
- *
- * @param m A pointer to a meta data reader
- */
 void meta_reader_destroy(meta_reader_t *m);
 
-/**
- * @brief Seek to a specific meta data block and offset
- *
- * @memberof meta_reader_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param m           A pointer to a meta data reader
- * @param block_start The absolute position of the 16 bit header right before
- *                    the compressed data block
- * @param offset      A byte offset into the data block
- *
- * @return Zero on success, -1 on failure
- */
+/* Returns 0 on success. Internally prints to stderr on failure */
 int meta_reader_seek(meta_reader_t *m, uint64_t block_start,
 		     size_t offset);
 
-/**
- * @brief Read a chunk of data from a meta data block
- *
- * @memberof meta_reader_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * If the end of the block is reached, this function transparently tries to
- * interpret the data after the current block as a further meta data block,
- * i.e. it can transparently read across multiple meta data blocks.
- *
- * @param m    A pointer to a meta data reader
- * @param data A pointer to a memory block to write the data to
- * @param size The number of bytes to read
- *
- * @return Zero on success, -1 on failure
- */
+/* Returns 0 on success. Internally prints to stderr on failure */
 int meta_reader_read(meta_reader_t *m, void *data, size_t size);
 
-/**
- * @brief Read an inode from a meta data block
- *
- * @memberof meta_reader_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * This function is a conveniance wrapper around @ref meta_reader_read that
- * reads and decodes an entire SquashFS inode. It first reads the common inode
- * header, interprets it and reads the additional, type dependend data.
- *
- * @param ir          A pointer to a meta data reader
- * @param super       A pointer to the SquashFS super block
- * @param block_start A byte offset relative to the inode table start where
- *                    the meta data containing the inode starts
- * @param offset      A byte offset into the uncompressed meta data block
- *                    where the inode is stored
- *
- * @return A pointer to the decoded inode or NULL on failure. Can be freed
- *         with a single free call.
- */
+/* Inode can be freed with a single free() call.
+   The function internally prints error message to stderr on failure. */
 sqfs_inode_generic_t *meta_reader_read_inode(meta_reader_t *ir,
 					     sqfs_super_t *super,
 					     uint64_t block_start,
 					     size_t offset);
 
-/**
- * @brief Read a directory header from a meta data block
- *
- * @memberof meta_reader_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * This function is a conveniance wrapper around @ref meta_reader_read that
- * reads and decodes a SquashFS directory header.
- *
- * @param m   A pointer to a meta data reader
- * @param hdr A pointer to a directory header structure to write the decoded
- *            data to
- *
- * @return Zero on success, -1 on failure
- */
+/* Returns 0 on success. Internally prints to stderr on failure */
 int meta_reader_read_dir_header(meta_reader_t *m, sqfs_dir_header_t *hdr);
 
-/**
- * @brief Read a directory entry from a meta data block
- *
- * @memberof meta_reader_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * This function is a conveniance wrapper around @ref meta_reader_read that
- * reads and decodes a SquashFS directory entry.
- *
- * @param m A pointer to a meta data reader
- *
- * @return A pointer to a directory entry or NULL on failure. Can be freed
- *         with a single free call.
- */
+/* Entry can be freed with a single free() call.
+   The function internally prints to stderr on failure */
 sqfs_dir_entry_t *meta_reader_read_dir_ent(meta_reader_t *m);
 
 #endif /* META_READER_H */
diff --git a/include/meta_writer.h b/include/meta_writer.h
index 6bcb29b..7036b6a 100644
--- a/include/meta_writer.h
+++ b/include/meta_writer.h
@@ -7,69 +7,24 @@
 
 typedef struct meta_writer_t meta_writer_t;
 
-/**
- * @brief Create a meta data writer
- *
- * @memberof meta_writer_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * @param fd  The underlying file descriptor to write from
- * @param cmp A pointer to a compressor to use for compressing the data
- *
- * @return A pointer to a meta data writer, NULL on failure
- */
+/* Create a meta data reader using a given compressor to compress data.
+   Internally prints error message to stderr on failure. */
 meta_writer_t *meta_writer_create(int fd, compressor_t *cmp);
 
-/**
- * @brief Destroy a meta data writer and free all memory used by it
- *
- * @memberof meta_writer_t
- *
- * @param m A pointer to a meta data reader
- */
 void meta_writer_destroy(meta_writer_t *m);
 
-/**
- * @brief Flush the currently unfinished meta data block to disk
- *
- * @memberof meta_writer_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * If data has been collected in the block buffer but it is not complete yet,
- * this function tries to compress it and write it out anyway and reset the
- * internal counters.
- *
- * @param m A pointer to a meta data reader
- *
- * @return Zero on success, -1 on failure
- */
+/* Compress and flush the currently unfinished block to disk. Returns 0 on
+   success, internally prints error message to stderr on failure */
 int meta_writer_flush(meta_writer_t *m);
 
-/**
- * @brief Append data to the current meta data block
- *
- * @memberof meta_writer_t
- *
- * @note This function internally prints error message to stderr on failure
- *
- * This function appends the input data to an internal meta data buffer. If
- * the internal buffer is full, it is compressed and written to disk using
- * @ref meta_writer flush, i.e. the function allows for transparent writing
- * across meta data blocks.
- *
- * @param m    A pointer to a meta data reader
- * @param data A pointer to the data block to append
- * @param size The number of bytes to read from the data blob
- *
- * @return Zero on success, -1 on failure
- */
+/* Returns 0 on success. Prints error message to stderr on failure. */
 int meta_writer_append(meta_writer_t *m, const void *data, size_t size);
 
+/* Query the current block start position and offset within the block */
 void meta_writer_get_position(const meta_writer_t *m, uint64_t *block_start,
 			      uint32_t *offset);
 
+/* Reset all internal state, including the current block start position. */
 void meta_writer_reset(meta_writer_t *m);
 
 #endif /* META_WRITER_H */
diff --git a/include/squashfs.h b/include/squashfs.h
index 5574b29..f9df73d 100644
--- a/include/squashfs.h
+++ b/include/squashfs.h
@@ -240,11 +240,14 @@ typedef enum {
 	SQUASHFS_XATTR_PREFIX_MASK = 0xFF,
 } E_SQFS_XATTR_TYPE;
 
+/* Returns 0 on success. Prints error messages to stderr on failure. */
 int sqfs_super_init(sqfs_super_t *super, size_t block_size, uint32_t mtime,
 		    E_SQFS_COMPRESSOR compressor);
 
+/* Returns 0 on success. Prints error messages to stderr on failure. */
 int sqfs_super_write(sqfs_super_t *super, int fd);
 
+/* Returns 0 on success. Prints error messages to stderr on failure. */
 int sqfs_super_read(sqfs_super_t *super, int fd);
 
 #endif /* SQUASHFS_H */
diff --git a/include/str_table.h b/include/str_table.h
index b0d83f1..db36c5b 100644
--- a/include/str_table.h
+++ b/include/str_table.h
@@ -8,14 +8,9 @@ typedef struct str_bucket_t {
 	size_t index;
 } str_bucket_t;
 
-/**
- * @struct str_table_t
- *
- * @brief A data structure that manages incremental, unique IDs for strings
- *
- * A string table allocates IDs for strings, and provides fast lookup for ID by
- * string and string by ID.
- */
+/* Stores strings in a hash table and assigns an incremental, unique ID to
+   each string. Subsequent additions return the existing ID. The ID can be
+   used for (hopefully) constant time lookup of the original string. */
 typedef struct {
 	str_bucket_t **buckets;
 	size_t num_buckets;
@@ -25,52 +20,18 @@ typedef struct {
 	size_t max_strings;
 } str_table_t;
 
-/**
- * @brief Initialize a string table
- *
- * @memberof str_table_t
- *
- * @param size The number of hash table buckets to use internally
- *
- * @return Zero on success, -1 on failure (reports error to stderr)
- */
+/* `size` is the number of hash table buckets to use internally.
+   Returns 0 on success. Internally writes errors to stderr. */
 int str_table_init(str_table_t *table, size_t size);
 
-/**
- * @brief Free all memory used by a string table
- *
- * @memberof str_table_t
- *
- * @param table A pointer to a string table object
- */
 void str_table_cleanup(str_table_t *table);
 
-/**
- * @brief Resolve a string to an incremental, unique ID
- *
- * @memberof str_table_t
- *
- * If the string is passed to this function for the first time, a new ID
- * is allocated for the string.
- *
- * @param table A pointer to a string table object
- * @param str   A pointer to a string to resolve
- * @param idx   Returns the unique ID of the string
- *
- * @return Zero on success, -1 on failure (reports error to stderr)
- */
+/* Resolve a string to an incremental, unique ID
+   Returns 0 on success. Internally writes errors to stderr. */
 int str_table_get_index(str_table_t *table, const char *str, size_t *idx);
 
-/**
- * @brief Resolve a unique ID to the string it represents
- *
- * @memberof str_table_t
- *
- * @param table A pointer to a string table object
- * @param index The ID to resolve
- *
- * @return A pointer to the string or NULL if it hasn't been added yet
- */
+/* Resolve a unique ID to the string it represents.
+   Returns NULL if the ID is unknown, i.e. out of bounds. */
 const char *str_table_get_string(str_table_t *table, size_t index);
 
 #endif /* STR_TABLE_H */
diff --git a/include/table.h b/include/table.h
index ed2cb4a..6d61c85 100644
--- a/include/table.h
+++ b/include/table.h
@@ -8,26 +8,16 @@
 #include <stdint.h>
 #include <stddef.h>
 
-/**
- * @brief Convenience function for writing meta data to a SquashFS image
- *
- * @note This function internally prints error message to stderr on failure
- *
- * This function internally creates a meta data writer and writes 'count'
- * blocks of data from 'data' to it, each 'entsize' bytes in size. For each
- * meta data block, it remembers the 64 bit start address, writes out all
- * addresses to the and returns the location where the address list starts.
- * For instance, the fragment table and ID table are stored in this format.
- *
- * @param outfd      The file descriptor to write to
- * @param super      A pointer to the SquashFS super block
- * @param data       A pointer to the data to write out
- * @param entsize    The size of each data record
- * @param count      The number of data records to write out
- * @param startblock Returns the location of the lookup table
- * @param cmp        A pointer to the compressor to use for the meta data writer
- *
- * @return Zero on success, -1 on failure
+/*
+  Convenience function for writing meta data to a SquashFS image
+
+  This function internally creates a meta data writer and writes 'count'
+  blocks of data from 'data' to it, each 'entsize' bytes in size. For each
+  meta data block, it remembers the 64 bit start address, writes out all
+  addresses to an uncompressed address list and returns the location where
+  the address list starts.
+
+  Returns 0 on success. Internally prints error messages to stderr.
  */
 int sqfs_write_table(int outfd, sqfs_super_t *super, const void *data,
 		     size_t entsize, size_t count, uint64_t *startblock,
diff --git a/include/util.h b/include/util.h
index 4857539..f618f81 100644
--- a/include/util.h
+++ b/include/util.h
@@ -4,54 +4,41 @@
 
 #include <sys/types.h>
 
-/**
- * @brief Turn a file path to a more usefull form
- *
- * Removes all preceeding and trailing slashes, shortens all sequences of
- * slashes to a single slash and returns failure state if one of the path
- * components is '..' or '.'.
- *
- * @param filename A pointer to the path to work on
- *
- * @return Zero on success, -1 on failure
- */
+/*
+  Removes all preceeding and trailing slashes, shortens all sequences of
+  slashes to a single slash and returns failure state if one of the path
+  components is '..' or '.'.
+
+  Returns 0 on success.
+*/
 int canonicalize_name(char *filename);
 
-/**
- * @brief Write data to a file
- *
- * This is a wrapper around the Unix write() system call. It retries the write
- * if it is interrupted by a signal or only part of the data was written.
- */
+/*
+  A wrapper around the write() system call. It retries the write if it is
+  interrupted by a signal or only part of the data was written.
+*/
 ssize_t write_retry(int fd, void *data, size_t size);
 
-/**
- * @brief Read data from a file
- *
- * This is a wrapper around the Unix read() system call. It retries the read
- * if it is interrupted by a signal or less than the desired size was read.
- */
+/*
+  A wrapper around the read() system call. It retries the read if it is
+  interrupted by a signal or less than the desired size was read.
+*/
 ssize_t read_retry(int fd, void *buffer, size_t size);
 
-/**
- * @brief A common implementation of the '--version' command line argument
- *
- * Prints out version information. The program name is extracted from the
- * BSD style __progname global variable.
- */
+/*
+  A common implementation of the '--version' command line flag.
+
+  Prints out version information. The program name is extracted from the
+  BSD style __progname global variable.
+*/
 void print_version(void);
 
-/**
- * @brief Create a directory and all its parents
- *
- * This is a wrapper around mkdir() that behaves like 'mkdir -p'. It tries to
- * create every component of the given path and treats already existing entries
- * as success.
- *
- * @param path A path to create
- *
- * @return Zero on success, -1 on failure
- */
+/*
+  A wrapper around mkdir() that behaves like 'mkdir -p'. It tries to create
+  every component of the given path and skips already existing entries.
+
+  Returns 0 on success.
+*/
 int mkdir_p(const char *path);
 
 #endif /* UTIL_H */