Diff: pb.h

Revision:

0:c7beea49fc91

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pb.h	Tue Feb 19 20:03:29 2013 +0000
@@ -0,0 +1,229 @@
+#ifndef _PB_H_
+#define _PB_H_
+
+/* pb.h: Common parts for nanopb library.
+ * Most of these are quite low-level stuff. For the high-level interface,
+ * see pb_encode.h or pb_decode.h
+ */
+
+#define NANOPB_VERSION nanopb-0.1.9
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifdef __GNUC__
+/* This just reduces memory requirements, but is not required. */
+#define pb_packed __attribute__((packed))
+#else
+#define pb_packed
+#endif
+
+/* Handly macro for suppressing unreferenced-parameter compiler warnings.    */
+#ifndef UNUSED
+#define UNUSED(x) (void)(x)
+#endif
+
+/* Compile-time assertion, used for checking compatible compilation options.
+ * If this fails on your compiler for some reason, use #define STATIC_ASSERT
+ * to disable it. */
+#ifndef STATIC_ASSERT
+#define STATIC_ASSERT(COND,MSG) typedef char STATIC_ASSERT_MSG(MSG, __LINE__, __COUNTER__)[(COND)?1:-1];
+#define STATIC_ASSERT_MSG(MSG, LINE, COUNTER) STATIC_ASSERT_MSG_(MSG, LINE, COUNTER)
+#define STATIC_ASSERT_MSG_(MSG, LINE, COUNTER) static_assertion_##MSG##LINE##COUNTER
+#endif
+
+/* Number of required fields to keep track of
+ * (change here or on compiler command line). */
+#ifndef PB_MAX_REQUIRED_FIELDS
+#define PB_MAX_REQUIRED_FIELDS 64
+#endif
+
+#if PB_MAX_REQUIRED_FIELDS < 64
+#error You should not lower PB_MAX_REQUIRED_FIELDS from the default value (64).
+#endif
+
+/* List of possible field types. These are used in the autogenerated code.
+ * Least-significant 4 bits tell the scalar type
+ * Most-significant 4 bits specify repeated/required/packed etc.
+ * 
+ * INT32 and UINT32 are treated the same, as are (U)INT64 and (S)FIXED*
+ * These types are simply casted to correct field type when they are
+ * assigned to the memory pointer.
+ * SINT* is different, though, because it is zig-zag coded.
+ */
+
+typedef enum {
+    /************************
+     * Field contents types *
+     ************************/
+    
+    /* Numeric types */
+    PB_LTYPE_VARINT = 0x00, /* int32, uint32, int64, uint64, bool, enum */
+    PB_LTYPE_SVARINT = 0x01, /* sint32, sint64 */
+    PB_LTYPE_FIXED32 = 0x02, /* fixed32, sfixed32, float */
+    PB_LTYPE_FIXED64 = 0x03, /* fixed64, sfixed64, double */
+    
+    /* Marker for last packable field type. */
+    PB_LTYPE_LAST_PACKABLE = 0x03,
+    
+    /* Byte array with pre-allocated buffer.
+     * data_size is the length of the allocated PB_BYTES_ARRAY structure. */
+    PB_LTYPE_BYTES = 0x04,
+    
+    /* String with pre-allocated buffer.
+     * data_size is the maximum length. */
+    PB_LTYPE_STRING = 0x05,
+    
+    /* Submessage
+     * submsg_fields is pointer to field descriptions */
+    PB_LTYPE_SUBMESSAGE = 0x06,
+    
+    /* Number of declared LTYPES */
+    PB_LTYPES_COUNT = 7,
+    PB_LTYPE_MASK = 0x0F,
+    
+    /******************
+     * Modifier flags *
+     ******************/
+    
+    /* Just the basic, write data at data_offset */
+    PB_HTYPE_REQUIRED = 0x00,
+    
+    /* Write true at size_offset */
+    PB_HTYPE_OPTIONAL = 0x10,
+    
+    /* Read to pre-allocated array
+     * Maximum number of entries is array_size,
+     * actual number is stored at size_offset */
+    PB_HTYPE_ARRAY = 0x20,
+    
+    /* Works for all required/optional/repeated fields.
+     * data_offset points to pb_callback_t structure.
+     * LTYPE should be valid or 0 (it is ignored, but
+     * sometimes used to speculatively index an array). */
+    PB_HTYPE_CALLBACK = 0x30,
+    
+    PB_HTYPE_MASK = 0xF0
+} pb_packed pb_type_t;
+
+#define PB_HTYPE(x) ((x) & PB_HTYPE_MASK)
+#define PB_LTYPE(x) ((x) & PB_LTYPE_MASK)
+
+/* This structure is used in auto-generated constants
+ * to specify struct fields.
+ * You can change field sizes if you need structures
+ * larger than 256 bytes or field tags larger than 256.
+ * The compiler should complain if your .proto has such
+ * structures. Fix that by defining PB_FIELD_16BIT or
+ * PB_FIELD_32BIT.
+ */
+typedef struct _pb_field_t pb_field_t;
+struct _pb_field_t {
+
+#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)
+    uint8_t tag;
+    pb_type_t type;
+    uint8_t data_offset; /* Offset of field data, relative to previous field. */
+    int8_t size_offset; /* Offset of array size or has-boolean, relative to data */
+    uint8_t data_size; /* Data size in bytes for a single item */
+    uint8_t array_size; /* Maximum number of entries in array */
+#elif defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)
+    uint16_t tag;
+    pb_type_t type;
+    uint8_t data_offset;
+    int8_t size_offset;
+    uint16_t data_size;
+    uint16_t array_size;
+#else
+    uint32_t tag;
+    pb_type_t type;
+    uint8_t data_offset;
+    int8_t size_offset;
+    uint32_t data_size;
+    uint32_t array_size;
+#endif
+    
+    /* Field definitions for submessage
+     * OR default value for all other non-array, non-callback types
+     * If null, then field will zeroed. */
+    const void *ptr;
+} pb_packed;
+
+/* This structure is used for 'bytes' arrays.
+ * It has the number of bytes in the beginning, and after that an array.
+ * Note that actual structs used will have a different length of bytes array.
+ */
+struct _pb_bytes_array_t {
+    size_t size;
+    uint8_t bytes[1];
+};
+
+typedef struct _pb_bytes_array_t pb_bytes_array_t;
+
+/* This structure is used for giving the callback function.
+ * It is stored in the message structure and filled in by the method that
+ * calls pb_decode.
+ *
+ * The decoding callback will be given a limited-length stream
+ * If the wire type was string, the length is the length of the string.
+ * If the wire type was a varint/fixed32/fixed64, the length is the length
+ * of the actual value.
+ * The function may be called multiple times (especially for repeated types,
+ * but also otherwise if the message happens to contain the field multiple
+ * times.)
+ *
+ * The encoding callback will receive the actual output stream.
+ * It should write all the data in one call, including the field tag and
+ * wire type. It can write multiple fields.
+ *
+ * The callback can be null if you want to skip a field.
+ */
+typedef struct _pb_istream_t pb_istream_t;
+typedef struct _pb_ostream_t pb_ostream_t;
+typedef struct _pb_callback_t pb_callback_t;
+struct _pb_callback_t {
+    union {
+        bool (*decode)(pb_istream_t *stream, const pb_field_t *field, void *arg);
+        bool (*encode)(pb_ostream_t *stream, const pb_field_t *field, const void *arg);
+    } funcs;
+    
+    /* Free arg for use by callback */
+    void *arg;
+};
+
+/* Wire types. Library user needs these only in encoder callbacks. */
+typedef enum {
+    PB_WT_VARINT = 0,
+    PB_WT_64BIT  = 1,
+    PB_WT_STRING = 2,
+    PB_WT_32BIT  = 5
+} pb_wire_type_t;
+
+/* These macros are used to declare pb_field_t's in the constant array. */
+#define pb_membersize(st, m) (sizeof ((st*)0)->m)
+#define pb_arraysize(st, m) (pb_membersize(st, m) / pb_membersize(st, m[0]))
+#define pb_delta(st, m1, m2) ((int)offsetof(st, m1) - (int)offsetof(st, m2))
+#define pb_delta_end(st, m1, m2) (offsetof(st, m1) - offsetof(st, m2) - pb_membersize(st, m2))
+#define PB_LAST_FIELD {0,(pb_type_t) 0,0,0,0,0,0}
+
+/* These macros are used for giving out error messages.
+ * They are mostly a debugging aid; the main error information
+ * is the true/false return value from functions.
+ * Some code space can be saved by disabling the error
+ * messages if not used.
+ */
+#ifdef PB_NO_ERRMSG
+#define PB_RETURN_ERROR(stream,msg) return false
+#define PB_GET_ERROR(stream) "(errmsg disabled)"
+#else
+#define PB_RETURN_ERROR(stream,msg) \
+    do {\
+        if ((stream)->errmsg == NULL) \
+            (stream)->errmsg = (msg); \
+        return false; \
+    } while(0)
+#define PB_GET_ERROR(stream) ((stream)->errmsg ? (stream)->errmsg : "(none)")
+#endif
+
+#endif