Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1110 insertions, 0 deletions

diff --git a/include/protobuf-c/protobuf-c.h b/include/protobuf-c/protobuf-c.h
new file mode 100644
index 0000000..442abf6
--- /dev/null
+++ b/include/protobuf-c/protobuf-c.h
@@ -0,0 +1,1110 @@
+/*
+ * Copyright (c) 2008-2022, Dave Benson and the protobuf-c authors.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*! \file
+ * \mainpage Introduction
+ *
+ * This is [protobuf-c], a C implementation of [Protocol Buffers].
+ *
+ * This file defines the public API for the `libprotobuf-c` support library.
+ * This API includes interfaces that can be used directly by client code as well
+ * as the interfaces used by the code generated by the `protoc-c` compiler.
+ *
+ * The `libprotobuf-c` support library performs the actual serialization and
+ * deserialization of Protocol Buffers messages. It interacts with structures,
+ * definitions, and metadata generated by the `protoc-c` compiler from .proto
+ * files.
+ *
+ * \authors Dave Benson and the `protobuf-c` authors.
+ *
+ * \copyright 2008-2014. Licensed under the terms of the [BSD-2-Clause] license.
+ *
+ * [protobuf-c]:       https://github.com/protobuf-c/protobuf-c
+ * [Protocol Buffers]: https://developers.google.com/protocol-buffers/
+ * [BSD-2-Clause]:     http://opensource.org/licenses/BSD-2-Clause
+ *
+ * \page gencode Generated Code
+ *
+ * For each enum, we generate a C enum. For each message, we generate a C
+ * structure which can be cast to a `ProtobufCMessage`.
+ *
+ * For each enum and message, we generate a descriptor object that allows us to
+ * implement a kind of reflection on the structures.
+ *
+ * First, some naming conventions:
+ *
+ * - The name of the type for enums and messages and services is camel case
+ *   (meaning WordsAreCrammedTogether) except that double underscores are used
+ *   to delimit scopes. For example, the following `.proto` file:
+ *
+~~~{.proto}
+        package foo.bar;
+        message BazBah {
+            optional int32 val = 1;
+        }
+~~~
+ *
+ * would generate a C type `Foo__Bar__BazBah`.
+ *
+ * - Identifiers for functions and globals are all lowercase, with camel case
+ *   words separated by single underscores. For example, one of the function
+ *   prototypes generated by `protoc-c` for the above example:
+ *
+~~~{.c}
+Foo__Bar__BazBah *
+       foo__bar__baz_bah__unpack
+                     (ProtobufCAllocator  *allocator,
+                      size_t               len,
+                      const uint8_t       *data);
+~~~
+ *
+ * - Identifiers for enum values contain an uppercase prefix which embeds the
+ *   package name and the enum type name.
+ *
+ * - A double underscore is used to separate further components of identifier
+ *   names.
+ *
+ * For example, in the name of the unpack function above, the package name
+ * `foo.bar` has become `foo__bar`, the message name BazBah has become
+ * `baz_bah`, and the method name is `unpack`. These are all joined with double
+ * underscores to form the C identifier `foo__bar__baz_bah__unpack`.
+ *
+ * We also generate descriptor objects for messages and enums. These are
+ * declared in the `.pb-c.h` files:
+ *
+~~~{.c}
+extern const ProtobufCMessageDescriptor foo__bar__baz_bah__descriptor;
+~~~
+ *
+ * The message structures all begin with `ProtobufCMessageDescriptor *` which is
+ * sufficient to allow them to be cast to `ProtobufCMessage`.
+ *
+ * For each message defined in a `.proto` file, we generate a number of
+ * functions and macros. Each function name contains a prefix based on the
+ * package name and message name in order to make it a unique C identifier.
+ *
+ * - `INIT`. Statically initializes a message object, initializing its
+ *   descriptor and setting its fields to default values. Uninitialized
+ *   messages cannot be processed by the protobuf-c library.
+ *
+~~~{.c}
+#define FOO__BAR__BAZ_BAH__INIT \
+ { PROTOBUF_C_MESSAGE_INIT (&foo__bar__baz_bah__descriptor), 0 }
+~~~
+ * - `init()`. Initializes a message object, initializing its descriptor and
+ *   setting its fields to default values. Uninitialized messages cannot be
+ *   processed by the protobuf-c library.
+ *
+~~~{.c}
+void foo__bar__baz_bah__init
+                     (Foo__Bar__BazBah *message);
+~~~
+ * - `unpack()`. Unpacks data for a particular message format. Note that the
+ *   `allocator` parameter is usually `NULL` to indicate that the system's
+ *   `malloc()` and `free()` functions should be used for dynamically allocating
+ *   memory.
+ *
+~~~{.c}
+Foo__Bar__BazBah *
+       foo__bar__baz_bah__unpack
+                     (ProtobufCAllocator  *allocator,
+                      size_t               len,
+                      const uint8_t       *data);
+~~~
+ *
+ * - `free_unpacked()`. Frees a message object obtained with the `unpack()`
+ *   method. Freeing `NULL` is allowed (the same as with `free()`).
+ *
+~~~{.c}
+void   foo__bar__baz_bah__free_unpacked
+                     (Foo__Bar__BazBah *message,
+                      ProtobufCAllocator *allocator);
+~~~
+ *
+ * - `get_packed_size()`. Calculates the length in bytes of the serialized
+ *   representation of the message object.
+ *
+~~~{.c}
+size_t foo__bar__baz_bah__get_packed_size
+                     (const Foo__Bar__BazBah   *message);
+~~~
+ *
+ * - `pack()`. Pack a message object into a preallocated buffer. Assumes that
+ *   the buffer is large enough. (Use `get_packed_size()` first.)
+ *
+~~~{.c}
+size_t foo__bar__baz_bah__pack
+                     (const Foo__Bar__BazBah   *message,
+                      uint8_t             *out);
+~~~
+ *
+ * - `pack_to_buffer()`. Packs a message into a "virtual buffer". This is an
+ *   object which defines an "append bytes" callback to consume data as it is
+ *   serialized.
+ *
+~~~{.c}
+size_t foo__bar__baz_bah__pack_to_buffer
+                     (const Foo__Bar__BazBah   *message,
+                      ProtobufCBuffer     *buffer);
+~~~
+ *
+ * \page pack Packing and unpacking messages
+ *
+ * To pack a message, first compute the packed size of the message with
+ * protobuf_c_message_get_packed_size(), then allocate a buffer of at least
+ * that size, then call protobuf_c_message_pack().
+ *
+ * Alternatively, a message can be serialized without calculating the final size
+ * first. Use the protobuf_c_message_pack_to_buffer() function and provide a
+ * ProtobufCBuffer object which implements an "append" method that consumes
+ * data.
+ *
+ * To unpack a message, call the protobuf_c_message_unpack() function. The
+ * result can be cast to an object of the type that matches the descriptor for
+ * the message.
+ *
+ * The result of unpacking a message should be freed with
+ * protobuf_c_message_free_unpacked().
+ */
+
+#ifndef PROTOBUF_C_H
+#define PROTOBUF_C_H
+
+#include <assert.h>
+#include <limits.h>
+#include <stddef.h>
+#include <inttypes.h>	/* stdint.h not present on older systems */
+
+#ifdef __cplusplus
+# define PROTOBUF_C__BEGIN_DECLS	extern "C" {
+# define PROTOBUF_C__END_DECLS		}
+#else
+# define PROTOBUF_C__BEGIN_DECLS
+# define PROTOBUF_C__END_DECLS
+#endif
+
+PROTOBUF_C__BEGIN_DECLS
+
+#if defined(_WIN32) && defined(PROTOBUF_C_USE_SHARED_LIB)
+# ifdef PROTOBUF_C_EXPORT
+#  define PROTOBUF_C__API __declspec(dllexport)
+# else
+#  define PROTOBUF_C__API __declspec(dllimport)
+# endif
+#else
+# define PROTOBUF_C__API
+#endif
+
+#if !defined(PROTOBUF_C__NO_DEPRECATED) && \
+	((__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1))
+# define PROTOBUF_C__DEPRECATED __attribute__((__deprecated__))
+#else
+# define PROTOBUF_C__DEPRECATED
+#endif
+
+#ifndef PROTOBUF_C__FORCE_ENUM_TO_BE_INT_SIZE
+ #define PROTOBUF_C__FORCE_ENUM_TO_BE_INT_SIZE(enum_name) \
+  , _##enum_name##_IS_INT_SIZE = INT_MAX
+#endif
+
+#define PROTOBUF_C__SERVICE_DESCRIPTOR_MAGIC    0x14159bc3
+#define PROTOBUF_C__MESSAGE_DESCRIPTOR_MAGIC    0x28aaeef9
+#define PROTOBUF_C__ENUM_DESCRIPTOR_MAGIC       0x114315af
+
+/* Empty string used for initializers */
+#if defined(_WIN32) && defined(PROTOBUF_C_USE_SHARED_LIB)
+static const char protobuf_c_empty_string[] = "";
+#else
+extern const char protobuf_c_empty_string[];
+#endif
+
+/**
+ * \defgroup api Public API
+ *
+ * This is the public API for `libprotobuf-c`. These interfaces are stable and
+ * subject to Semantic Versioning guarantees.
+ *
+ * @{
+ */
+
+/**
+ * Values for the `flags` word in `ProtobufCFieldDescriptor`.
+ */
+typedef enum {
+	/** Set if the field is repeated and marked with the `packed` option. */
+	PROTOBUF_C_FIELD_FLAG_PACKED		= (1 << 0),
+
+	/** Set if the field is marked with the `deprecated` option. */
+	PROTOBUF_C_FIELD_FLAG_DEPRECATED	= (1 << 1),
+
+	/** Set if the field is a member of a oneof (union). */
+	PROTOBUF_C_FIELD_FLAG_ONEOF		= (1 << 2),
+} ProtobufCFieldFlag;
+
+/**
+ * Message field rules.
+ *
+ * \see [Defining A Message Type] in the Protocol Buffers documentation.
+ *
+ * [Defining A Message Type]:
+ *      https://developers.google.com/protocol-buffers/docs/proto#simple
+ */
+typedef enum {
+	/** A well-formed message must have exactly one of this field. */
+	PROTOBUF_C_LABEL_REQUIRED,
+
+	/**
+	 * A well-formed message can have zero or one of this field (but not
+	 * more than one).
+	 */
+	PROTOBUF_C_LABEL_OPTIONAL,
+
+	/**
+	 * This field can be repeated any number of times (including zero) in a
+	 * well-formed message. The order of the repeated values will be
+	 * preserved.
+	 */
+	PROTOBUF_C_LABEL_REPEATED,
+
+	/**
+	 * This field has no label. This is valid only in proto3 and is
+	 * equivalent to OPTIONAL but no "has" quantifier will be consulted.
+	 */
+	PROTOBUF_C_LABEL_NONE,
+} ProtobufCLabel;
+
+/**
+ * Field value types.
+ *
+ * \see [Scalar Value Types] in the Protocol Buffers documentation.
+ *
+ * [Scalar Value Types]:
+ *      https://developers.google.com/protocol-buffers/docs/proto#scalar
+ */
+typedef enum {
+	PROTOBUF_C_TYPE_INT32,      /**< int32 */
+	PROTOBUF_C_TYPE_SINT32,     /**< signed int32 */
+	PROTOBUF_C_TYPE_SFIXED32,   /**< signed int32 (4 bytes) */
+	PROTOBUF_C_TYPE_INT64,      /**< int64 */
+	PROTOBUF_C_TYPE_SINT64,     /**< signed int64 */
+	PROTOBUF_C_TYPE_SFIXED64,   /**< signed int64 (8 bytes) */
+	PROTOBUF_C_TYPE_UINT32,     /**< unsigned int32 */
+	PROTOBUF_C_TYPE_FIXED32,    /**< unsigned int32 (4 bytes) */
+	PROTOBUF_C_TYPE_UINT64,     /**< unsigned int64 */
+	PROTOBUF_C_TYPE_FIXED64,    /**< unsigned int64 (8 bytes) */
+	PROTOBUF_C_TYPE_FLOAT,      /**< float */
+	PROTOBUF_C_TYPE_DOUBLE,     /**< double */
+	PROTOBUF_C_TYPE_BOOL,       /**< boolean */
+	PROTOBUF_C_TYPE_ENUM,       /**< enumerated type */
+	PROTOBUF_C_TYPE_STRING,     /**< UTF-8 or ASCII string */
+	PROTOBUF_C_TYPE_BYTES,      /**< arbitrary byte sequence */
+	PROTOBUF_C_TYPE_MESSAGE,    /**< nested message */
+} ProtobufCType;
+
+/**
+ * Field wire types.
+ *
+ * \see [Message Structure] in the Protocol Buffers documentation.
+ *
+ * [Message Structure]:
+ *      https://developers.google.com/protocol-buffers/docs/encoding#structure
+ */
+typedef enum {
+	PROTOBUF_C_WIRE_TYPE_VARINT = 0,
+	PROTOBUF_C_WIRE_TYPE_64BIT = 1,
+	PROTOBUF_C_WIRE_TYPE_LENGTH_PREFIXED = 2,
+	/* "Start group" and "end group" wire types are unsupported. */
+	PROTOBUF_C_WIRE_TYPE_32BIT = 5,
+} ProtobufCWireType;
+
+struct ProtobufCAllocator;
+struct ProtobufCBinaryData;
+struct ProtobufCBuffer;
+struct ProtobufCBufferSimple;
+struct ProtobufCEnumDescriptor;
+struct ProtobufCEnumValue;
+struct ProtobufCEnumValueIndex;
+struct ProtobufCFieldDescriptor;
+struct ProtobufCIntRange;
+struct ProtobufCMessage;
+struct ProtobufCMessageDescriptor;
+struct ProtobufCMessageUnknownField;
+struct ProtobufCMethodDescriptor;
+struct ProtobufCService;
+struct ProtobufCServiceDescriptor;
+
+typedef struct ProtobufCAllocator ProtobufCAllocator;
+typedef struct ProtobufCBinaryData ProtobufCBinaryData;
+typedef struct ProtobufCBuffer ProtobufCBuffer;
+typedef struct ProtobufCBufferSimple ProtobufCBufferSimple;
+typedef struct ProtobufCEnumDescriptor ProtobufCEnumDescriptor;
+typedef struct ProtobufCEnumValue ProtobufCEnumValue;
+typedef struct ProtobufCEnumValueIndex ProtobufCEnumValueIndex;
+typedef struct ProtobufCFieldDescriptor ProtobufCFieldDescriptor;
+typedef struct ProtobufCIntRange ProtobufCIntRange;
+typedef struct ProtobufCMessage ProtobufCMessage;
+typedef struct ProtobufCMessageDescriptor ProtobufCMessageDescriptor;
+typedef struct ProtobufCMessageUnknownField ProtobufCMessageUnknownField;
+typedef struct ProtobufCMethodDescriptor ProtobufCMethodDescriptor;
+typedef struct ProtobufCService ProtobufCService;
+typedef struct ProtobufCServiceDescriptor ProtobufCServiceDescriptor;
+
+/** Boolean type. */
+typedef int protobuf_c_boolean;
+
+typedef void (*ProtobufCClosure)(const ProtobufCMessage *, void *closure_data);
+typedef void (*ProtobufCMessageInit)(ProtobufCMessage *);
+typedef void (*ProtobufCServiceDestroy)(ProtobufCService *);
+
+/**
+ * Structure for defining a custom memory allocator.
+ */
+struct ProtobufCAllocator {
+	/** Function to allocate memory. */
+	void		*(*alloc)(void *allocator_data, size_t size);
+
+	/** Function to free memory. */
+	void		(*free)(void *allocator_data, void *pointer);
+
+	/** Opaque pointer passed to `alloc` and `free` functions. */
+	void		*allocator_data;
+};
+
+/**
+ * Structure for the protobuf `bytes` scalar type.
+ *
+ * The data contained in a `ProtobufCBinaryData` is an arbitrary sequence of
+ * bytes. It may contain embedded `NUL` characters and is not required to be
+ * `NUL`-terminated.
+ */
+struct ProtobufCBinaryData {
+	size_t	len;        /**< Number of bytes in the `data` field. */
+	uint8_t	*data;      /**< Data bytes. */
+};
+
+/**
+ * Structure for defining a virtual append-only buffer. Used by
+ * protobuf_c_message_pack_to_buffer() to abstract the consumption of serialized
+ * bytes.
+ *
+ * `ProtobufCBuffer` "subclasses" may be defined on the stack. For example, to
+ * write to a `FILE` object:
+ *
+~~~{.c}
+typedef struct {
+        ProtobufCBuffer base;
+        FILE *fp;
+} BufferAppendToFile;
+
+static void
+my_buffer_file_append(ProtobufCBuffer *buffer,
+                      size_t len,
+                      const uint8_t *data)
+{
+        BufferAppendToFile *file_buf = (BufferAppendToFile *) buffer;
+        fwrite(data, len, 1, file_buf->fp); // XXX: No error handling!
+}
+~~~
+ *
+ * To use this new type of ProtobufCBuffer, it could be called as follows:
+ *
+~~~{.c}
+...
+BufferAppendToFile tmp = {0};
+tmp.base.append = my_buffer_file_append;
+tmp.fp = fp;
+protobuf_c_message_pack_to_buffer(&message, &tmp);
+...
+~~~
+ */
+struct ProtobufCBuffer {
+	/** Append function. Consumes the `len` bytes stored at `data`. */
+	void		(*append)(ProtobufCBuffer *buffer,
+				  size_t len,
+				  const uint8_t *data);
+};
+
+/**
+ * Simple buffer "subclass" of `ProtobufCBuffer`.
+ *
+ * A `ProtobufCBufferSimple` object is declared on the stack and uses a
+ * scratch buffer provided by the user for the initial allocation. It performs
+ * exponential resizing, using dynamically allocated memory. A
+ * `ProtobufCBufferSimple` object can be created and used as follows:
+ *
+~~~{.c}
+uint8_t pad[128];
+ProtobufCBufferSimple simple = PROTOBUF_C_BUFFER_SIMPLE_INIT(pad);
+ProtobufCBuffer *buffer = (ProtobufCBuffer *) &simple;
+~~~
+ *
+ * `buffer` can now be used with `protobuf_c_message_pack_to_buffer()`. Once a
+ * message has been serialized to a `ProtobufCBufferSimple` object, the
+ * serialized data bytes can be accessed from the `.data` field.
+ *
+ * To free the memory allocated by a `ProtobufCBufferSimple` object, if any,
+ * call PROTOBUF_C_BUFFER_SIMPLE_CLEAR() on the object, for example:
+ *
+~~~{.c}
+PROTOBUF_C_BUFFER_SIMPLE_CLEAR(&simple);
+~~~
+ *
+ * \see PROTOBUF_C_BUFFER_SIMPLE_INIT
+ * \see PROTOBUF_C_BUFFER_SIMPLE_CLEAR
+ */
+struct ProtobufCBufferSimple {
+	/** "Base class". */
+	ProtobufCBuffer		base;
+	/** Number of bytes allocated in `data`. */
+	size_t			alloced;
+	/** Number of bytes currently stored in `data`. */
+	size_t			len;
+	/** Data bytes. */
+	uint8_t			*data;
+	/** Whether `data` must be freed. */
+	protobuf_c_boolean	must_free_data;
+	/** Allocator to use. May be NULL to indicate the system allocator. */
+	ProtobufCAllocator	*allocator;
+};
+
+/**
+ * Describes an enumeration as a whole, with all of its values.
+ */
+struct ProtobufCEnumDescriptor {
+	/** Magic value checked to ensure that the API is used correctly. */
+	uint32_t			magic;
+
+	/** The qualified name (e.g., "namespace.Type"). */
+	const char			*name;
+	/** The unqualified name as given in the .proto file (e.g., "Type"). */
+	const char			*short_name;
+	/** Identifier used in generated C code. */
+	const char			*c_name;
+	/** The dot-separated namespace. */
+	const char			*package_name;
+
+	/** Number elements in `values`. */
+	unsigned			n_values;
+	/** Array of distinct values, sorted by numeric value. */
+	const ProtobufCEnumValue	*values;
+
+	/** Number of elements in `values_by_name`. */
+	unsigned			n_value_names;
+	/** Array of named values, including aliases, sorted by name. */
+	const ProtobufCEnumValueIndex	*values_by_name;
+
+	/** Number of elements in `value_ranges`. */
+	unsigned			n_value_ranges;
+	/** Value ranges, for faster lookups by numeric value. */
+	const ProtobufCIntRange		*value_ranges;
+
+	/** Reserved for future use. */
+	void				*reserved1;
+	/** Reserved for future use. */
+	void				*reserved2;
+	/** Reserved for future use. */
+	void				*reserved3;
+	/** Reserved for future use. */
+	void				*reserved4;
+};
+
+/**
+ * Represents a single value of an enumeration.
+ */
+struct ProtobufCEnumValue {
+	/** The string identifying this value in the .proto file. */
+	const char	*name;
+
+	/** The string identifying this value in generated C code. */
+	const char	*c_name;
+
+	/** The numeric value assigned in the .proto file. */
+	int		value;
+};
+
+/**
+ * Used by `ProtobufCEnumDescriptor` to look up enum values.
+ */
+struct ProtobufCEnumValueIndex {
+	/** Name of the enum value. */
+	const char      *name;
+	/** Index into values[] array. */
+	unsigned        index;
+};
+
+/**
+ * Describes a single field in a message.
+ */
+struct ProtobufCFieldDescriptor {
+	/** Name of the field as given in the .proto file. */
+	const char		*name;
+
+	/** Tag value of the field as given in the .proto file. */
+	uint32_t		id;
+
+	/** Whether the field is `REQUIRED`, `OPTIONAL`, or `REPEATED`. */
+	ProtobufCLabel		label;
+
+	/** The type of the field. */
+	ProtobufCType		type;
+
+	/**
+	 * The offset in bytes of the message's C structure's quantifier field
+	 * (the `has_MEMBER` field for optional members or the `n_MEMBER` field
+	 * for repeated members or the case enum for oneofs).
+	 */
+	unsigned		quantifier_offset;
+
+	/**
+	 * The offset in bytes into the message's C structure for the member
+	 * itself.
+	 */
+	unsigned		offset;
+
+	/**
+	 * A type-specific descriptor.
+	 *
+	 * If `type` is `PROTOBUF_C_TYPE_ENUM`, then `descriptor` points to the
+	 * corresponding `ProtobufCEnumDescriptor`.
+	 *
+	 * If `type` is `PROTOBUF_C_TYPE_MESSAGE`, then `descriptor` points to
+	 * the corresponding `ProtobufCMessageDescriptor`.
+	 *
+	 * Otherwise this field is NULL.
+	 */
+	const void		*descriptor; /* for MESSAGE and ENUM types */
+
+	/** The default value for this field, if defined. May be NULL. */
+	const void		*default_value;
+
+	/**
+	 * A flag word. Zero or more of the bits defined in the
+	 * `ProtobufCFieldFlag` enum may be set.
+	 */
+	uint32_t		flags;
+
+	/** Reserved for future use. */
+	unsigned		reserved_flags;
+	/** Reserved for future use. */
+	void			*reserved2;
+	/** Reserved for future use. */
+	void			*reserved3;
+};
+
+/**
+ * Helper structure for optimizing int => index lookups in the case
+ * where the keys are mostly consecutive values, as they presumably are for
+ * enums and fields.
+ *
+ * The data structures requires that the values in the original array are
+ * sorted.
+ */
+struct ProtobufCIntRange {
+	int             start_value;
+	unsigned        orig_index;
+	/*
+	 * NOTE: the number of values in the range can be inferred by looking
+	 * at the next element's orig_index. A dummy element is added to make
+	 * this simple.
+	 */
+};
+
+/**
+ * An instance of a message.
+ *
+ * `ProtobufCMessage` is a light-weight "base class" for all messages.
+ *
+ * In particular, `ProtobufCMessage` doesn't have any allocation policy
+ * associated with it. That's because it's common to create `ProtobufCMessage`
+ * objects on the stack. In fact, that's what we recommend for sending messages.
+ * If the object is allocated from the stack, you can't really have a memory
+ * leak.
+ *
+ * This means that calls to functions like protobuf_c_message_unpack() which
+ * return a `ProtobufCMessage` must be paired with a call to a free function,
+ * like protobuf_c_message_free_unpacked().
+ */
+struct ProtobufCMessage {
+	/** The descriptor for this message type. */
+	const ProtobufCMessageDescriptor	*descriptor;
+	/** The number of elements in `unknown_fields`. */
+	unsigned				n_unknown_fields;
+	/** The fields that weren't recognized by the parser. */
+	ProtobufCMessageUnknownField		*unknown_fields;
+};
+
+/**
+ * Describes a message.
+ */
+struct ProtobufCMessageDescriptor {
+	/** Magic value checked to ensure that the API is used correctly. */
+	uint32_t			magic;
+
+	/** The qualified name (e.g., "namespace.Type"). */
+	const char			*name;
+	/** The unqualified name as given in the .proto file (e.g., "Type"). */
+	const char			*short_name;
+	/** Identifier used in generated C code. */
+	const char			*c_name;
+	/** The dot-separated namespace. */
+	const char			*package_name;
+
+	/**
+	 * Size in bytes of the C structure representing an instance of this
+	 * type of message.
+	 */
+	size_t				sizeof_message;
+
+	/** Number of elements in `fields`. */
+	unsigned			n_fields;
+	/** Field descriptors, sorted by tag number. */
+	const ProtobufCFieldDescriptor	*fields;
+	/** Used for looking up fields by name. */
+	const unsigned			*fields_sorted_by_name;
+
+	/** Number of elements in `field_ranges`. */
+	unsigned			n_field_ranges;
+	/** Used for looking up fields by id. */
+	const ProtobufCIntRange		*field_ranges;
+
+	/** Message initialisation function. */
+	ProtobufCMessageInit		message_init;
+
+	/** Reserved for future use. */
+	void				*reserved1;
+	/** Reserved for future use. */
+	void				*reserved2;
+	/** Reserved for future use. */
+	void				*reserved3;
+};
+
+/**
+ * An unknown message field.
+ */
+struct ProtobufCMessageUnknownField {
+	/** The tag number. */
+	uint32_t		tag;
+	/** The wire type of the field. */
+	ProtobufCWireType	wire_type;
+	/** Number of bytes in `data`. */
+	size_t			len;
+	/** Field data. */
+	uint8_t			*data;
+};
+
+/**
+ * Method descriptor.
+ */
+struct ProtobufCMethodDescriptor {
+	/** Method name. */
+	const char				*name;
+	/** Input message descriptor. */
+	const ProtobufCMessageDescriptor	*input;
+	/** Output message descriptor. */
+	const ProtobufCMessageDescriptor	*output;
+};
+
+/**
+ * Service.
+ */
+struct ProtobufCService {
+	/** Service descriptor. */
+	const ProtobufCServiceDescriptor *descriptor;
+	/** Function to invoke the service. */
+	void (*invoke)(ProtobufCService *service,
+		       unsigned method_index,
+		       const ProtobufCMessage *input,
+		       ProtobufCClosure closure,
+		       void *closure_data);
+	/** Function to destroy the service. */
+	void (*destroy)(ProtobufCService *service);
+};
+
+/**
+ * Service descriptor.
+ */
+struct ProtobufCServiceDescriptor {
+	/** Magic value checked to ensure that the API is used correctly. */
+	uint32_t			magic;
+
+	/** Service name. */
+	const char			*name;
+	/** Short version of service name. */
+	const char			*short_name;
+	/** C identifier for the service name. */
+	const char			*c_name;
+	/** Package name. */
+	const char			*package;
+	/** Number of elements in `methods`. */
+	unsigned			n_methods;
+	/** Method descriptors, in the order defined in the .proto file. */
+	const ProtobufCMethodDescriptor	*methods;
+	/** Sort index of methods. */
+	const unsigned			*method_indices_by_name;
+};
+
+/**
+ * Get the version of the protobuf-c library. Note that this is the version of
+ * the library linked against, not the version of the headers compiled against.
+ *
+ * \return A string containing the version number of protobuf-c.
+ */
+PROTOBUF_C__API
+const char *
+protobuf_c_version(void);
+
+/**
+ * Get the version of the protobuf-c library. Note that this is the version of
+ * the library linked against, not the version of the headers compiled against.
+ *
+ * \return A 32 bit unsigned integer containing the version number of
+ *      protobuf-c, represented in base-10 as (MAJOR*1E6) + (MINOR*1E3) + PATCH.
+ */
+PROTOBUF_C__API
+uint32_t
+protobuf_c_version_number(void);
+
+/**
+ * The version of the protobuf-c headers, represented as a string using the same
+ * format as protobuf_c_version().
+ */
+#define PROTOBUF_C_VERSION		"1.4.1"
+
+/**
+ * The version of the protobuf-c headers, represented as an integer using the
+ * same format as protobuf_c_version_number().
+ */
+#define PROTOBUF_C_VERSION_NUMBER	1004001
+
+/**
+ * The minimum protoc-c version which works with the current version of the
+ * protobuf-c headers.
+ */
+#define PROTOBUF_C_MIN_COMPILER_VERSION	1000000
+
+/**
+ * Look up a `ProtobufCEnumValue` from a `ProtobufCEnumDescriptor` by name.
+ *
+ * \param desc
+ *      The `ProtobufCEnumDescriptor` object.
+ * \param name
+ *      The `name` field from the corresponding `ProtobufCEnumValue` object to
+ *      match.
+ * \return
+ *      A `ProtobufCEnumValue` object.
+ * \retval NULL
+ *      If not found or if the optimize_for = CODE_SIZE option was set.
+ */
+PROTOBUF_C__API
+const ProtobufCEnumValue *
+protobuf_c_enum_descriptor_get_value_by_name(
+	const ProtobufCEnumDescriptor *desc,
+	const char *name);
+
+/**
+ * Look up a `ProtobufCEnumValue` from a `ProtobufCEnumDescriptor` by numeric
+ * value.
+ *
+ * \param desc
+ *      The `ProtobufCEnumDescriptor` object.
+ * \param value
+ *      The `value` field from the corresponding `ProtobufCEnumValue` object to
+ *      match.
+ *
+ * \return
+ *      A `ProtobufCEnumValue` object.
+ * \retval NULL
+ *      If not found.
+ */
+PROTOBUF_C__API
+const ProtobufCEnumValue *
+protobuf_c_enum_descriptor_get_value(
+	const ProtobufCEnumDescriptor *desc,
+	int value);
+
+/**
+ * Look up a `ProtobufCFieldDescriptor` from a `ProtobufCMessageDescriptor` by
+ * the name of the field.
+ *
+ * \param desc
+ *      The `ProtobufCMessageDescriptor` object.
+ * \param name
+ *      The name of the field.
+ * \return
+ *      A `ProtobufCFieldDescriptor` object.
+ * \retval NULL
+ *      If not found or if the optimize_for = CODE_SIZE option was set.
+ */
+PROTOBUF_C__API
+const ProtobufCFieldDescriptor *
+protobuf_c_message_descriptor_get_field_by_name(
+	const ProtobufCMessageDescriptor *desc,
+	const char *name);
+
+/**
+ * Look up a `ProtobufCFieldDescriptor` from a `ProtobufCMessageDescriptor` by
+ * the tag value of the field.
+ *
+ * \param desc
+ *      The `ProtobufCMessageDescriptor` object.
+ * \param value
+ *      The tag value of the field.
+ * \return
+ *      A `ProtobufCFieldDescriptor` object.
+ * \retval NULL
+ *      If not found.
+ */
+PROTOBUF_C__API
+const ProtobufCFieldDescriptor *
+protobuf_c_message_descriptor_get_field(
+	const ProtobufCMessageDescriptor *desc,
+	unsigned value);
+
+/**
+ * Determine the number of bytes required to store the serialised message.
+ *
+ * \param message
+ *      The message object to serialise.
+ * \return
+ *      Number of bytes.
+ */
+PROTOBUF_C__API
+size_t
+protobuf_c_message_get_packed_size(const ProtobufCMessage *message);
+
+/**
+ * Serialise a message from its in-memory representation.
+ *
+ * This function stores the serialised bytes of the message in a pre-allocated
+ * buffer.
+ *
+ * \param message
+ *      The message object to serialise.
+ * \param[out] out
+ *      Buffer to store the bytes of the serialised message. This buffer must
+ *      have enough space to store the packed message. Use
+ *      protobuf_c_message_get_packed_size() to determine the number of bytes
+ *      required.
+ * \return
+ *      Number of bytes stored in `out`.
+ */
+PROTOBUF_C__API
+size_t
+protobuf_c_message_pack(const ProtobufCMessage *message, uint8_t *out);
+
+/**
+ * Serialise a message from its in-memory representation to a virtual buffer.
+ *
+ * This function calls the `append` method of a `ProtobufCBuffer` object to
+ * consume the bytes generated by the serialiser.
+ *
+ * \param message
+ *      The message object to serialise.
+ * \param buffer
+ *      The virtual buffer object.
+ * \return
+ *      Number of bytes passed to the virtual buffer.
+ */
+PROTOBUF_C__API
+size_t
+protobuf_c_message_pack_to_buffer(
+	const ProtobufCMessage *message,
+	ProtobufCBuffer *buffer);
+
+/**
+ * Unpack a serialised message into an in-memory representation.
+ *
+ * \param descriptor
+ *      The message descriptor.
+ * \param allocator
+ *      `ProtobufCAllocator` to use for memory allocation. May be NULL to
+ *      specify the default allocator.
+ * \param len
+ *      Length in bytes of the serialised message.
+ * \param data
+ *      Pointer to the serialised message.
+ * \return
+ *      An unpacked message object.
+ * \retval NULL
+ *      If an error occurred during unpacking.
+ */
+PROTOBUF_C__API
+ProtobufCMessage *
+protobuf_c_message_unpack(
+	const ProtobufCMessageDescriptor *descriptor,
+	ProtobufCAllocator *allocator,
+	size_t len,
+	const uint8_t *data);
+
+/**
+ * Free an unpacked message object.
+ *
+ * This function should be used to deallocate the memory used by a call to
+ * protobuf_c_message_unpack().
+ *
+ * \param message
+ *      The message object to free. May be NULL.
+ * \param allocator
+ *      `ProtobufCAllocator` to use for memory deallocation. May be NULL to
+ *      specify the default allocator.
+ */
+PROTOBUF_C__API
+void
+protobuf_c_message_free_unpacked(
+	ProtobufCMessage *message,
+	ProtobufCAllocator *allocator);
+
+/**
+ * Check the validity of a message object.
+ *
+ * Makes sure all required fields (`PROTOBUF_C_LABEL_REQUIRED`) are present.
+ * Recursively checks nested messages.
+ *
+ * \retval TRUE
+ *      Message is valid.
+ * \retval FALSE
+ *      Message is invalid.
+ */
+PROTOBUF_C__API
+protobuf_c_boolean
+protobuf_c_message_check(const ProtobufCMessage *);
+
+/** Message initialiser. */
+#define PROTOBUF_C_MESSAGE_INIT(descriptor) { descriptor, 0, NULL }
+
+/**
+ * Initialise a message object from a message descriptor.
+ *
+ * \param descriptor
+ *      Message descriptor.
+ * \param message
+ *      Allocated block of memory of size `descriptor->sizeof_message`.
+ */
+PROTOBUF_C__API
+void
+protobuf_c_message_init(
+	const ProtobufCMessageDescriptor *descriptor,
+	void *message);
+
+/**
+ * Free a service.
+ *
+ * \param service
+ *      The service object to free.
+ */
+PROTOBUF_C__API
+void
+protobuf_c_service_destroy(ProtobufCService *service);
+
+/**
+ * Look up a `ProtobufCMethodDescriptor` by name.
+ *
+ * \param desc
+ *      Service descriptor.
+ * \param name
+ *      Name of the method.
+ *
+ * \return
+ *      A `ProtobufCMethodDescriptor` object.
+ * \retval NULL
+ *      If not found or if the optimize_for = CODE_SIZE option was set.
+ */
+PROTOBUF_C__API
+const ProtobufCMethodDescriptor *
+protobuf_c_service_descriptor_get_method_by_name(
+	const ProtobufCServiceDescriptor *desc,
+	const char *name);
+
+/**
+ * Initialise a `ProtobufCBufferSimple` object.
+ */
+#define PROTOBUF_C_BUFFER_SIMPLE_INIT(array_of_bytes)                   \
+{                                                                       \
+	{ protobuf_c_buffer_simple_append },                            \
+	sizeof(array_of_bytes),                                         \
+	0,                                                              \
+	(array_of_bytes),                                               \
+	0,                                                              \
+	NULL                                                            \
+}
+
+/**
+ * Clear a `ProtobufCBufferSimple` object, freeing any allocated memory.
+ */
+#define PROTOBUF_C_BUFFER_SIMPLE_CLEAR(simp_buf)                        \
+do {                                                                    \
+	if ((simp_buf)->must_free_data) {                               \
+		if ((simp_buf)->allocator != NULL)                      \
+			(simp_buf)->allocator->free(                    \
+				(simp_buf)->allocator,                  \
+				(simp_buf)->data);			\
+		else                                                    \
+			free((simp_buf)->data);                         \
+	}                                                               \
+} while (0)
+
+/**
+ * The `append` method for `ProtobufCBufferSimple`.
+ *
+ * \param buffer
+ *      The buffer object to append to. Must actually be a
+ *      `ProtobufCBufferSimple` object.
+ * \param len
+ *      Number of bytes in `data`.
+ * \param data
+ *      Data to append.
+ */
+PROTOBUF_C__API
+void
+protobuf_c_buffer_simple_append(
+	ProtobufCBuffer *buffer,
+	size_t len,
+	const unsigned char *data);
+
+PROTOBUF_C__API
+void
+protobuf_c_service_generated_init(
+	ProtobufCService *service,
+	const ProtobufCServiceDescriptor *descriptor,
+	ProtobufCServiceDestroy destroy);
+
+PROTOBUF_C__API
+void
+protobuf_c_service_invoke_internal(
+	ProtobufCService *service,
+	unsigned method_index,
+	const ProtobufCMessage *input,
+	ProtobufCClosure closure,
+	void *closure_data);
+
+/**@}*/
+
+PROTOBUF_C__END_DECLS
+
+#endif /* PROTOBUF_C_H */