* 2011 Petteri Aimonen <jpa@kapsi.fi>
*/
-#define NANOPB_INTERNALS
#include "pb.h"
#include "pb_encode.h"
-#include <string.h>
+#include "pb_common.h"
-/* The warn_unused_result attribute appeared first in gcc-3.4.0 */
+/* Use the GCC warn_unused_result attribute to check that all return values
+ * are propagated correctly. On other compilers and gcc before 3.4.0 just
+ * ignore the annotation.
+ */
#if !defined(__GNUC__) || ( __GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
#define checkreturn
#else
- /* Verify that we remember to check all return values for proper error propagation */
#define checkreturn __attribute__((warn_unused_result))
#endif
+/**************************************
+ * Declarations internal to this file *
+ **************************************/
typedef bool (*pb_encoder_t)(pb_ostream_t *stream, const pb_field_t *field, const void *src) checkreturn;
+static bool checkreturn buf_write(pb_ostream_t *stream, const uint8_t *buf, size_t count);
+static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *field, const void *pData, size_t count, pb_encoder_t func);
+static bool checkreturn encode_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData);
+static bool checkreturn default_extension_encoder(pb_ostream_t *stream, const pb_extension_t *extension);
+static bool checkreturn encode_extension_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData);
+static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src);
+
/* --- Function pointers to field encoders ---
* Order in the array must match pb_action_t LTYPE numbering.
*/
static const pb_encoder_t PB_ENCODERS[PB_LTYPES_COUNT] = {
&pb_enc_varint,
+ &pb_enc_uvarint,
&pb_enc_svarint,
&pb_enc_fixed32,
&pb_enc_fixed64,
&pb_enc_bytes,
&pb_enc_string,
- &pb_enc_submessage
+ &pb_enc_submessage,
+ NULL /* extensions */
};
-/* pb_ostream_t implementation */
+/*******************************
+ * pb_ostream_t implementation *
+ *******************************/
static bool checkreturn buf_write(pb_ostream_t *stream, const uint8_t *buf, size_t count)
{
{
pb_ostream_t stream;
#ifdef PB_BUFFER_ONLY
- stream.callback = (void*)1; /* Just some marker value */
+ stream.callback = (void*)1; /* Just a marker value */
#else
stream.callback = &buf_write;
#endif
return true;
}
-/* Main encoding stuff */
+/*************************
+ * Encode a single field *
+ *************************/
-/* Callbacks don't need this function because they usually know the data type
- * without examining the field structure.
- * Therefore it is static for now.
- */
+/* Encode a static array. Handles the size calculations and possible packing. */
static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *field,
const void *pData, size_t count, pb_encoder_t func)
{
if (count == 0)
return true;
+
+ if (PB_ATYPE(field->type) != PB_ATYPE_POINTER && count > field->array_size)
+ PB_RETURN_ERROR(stream, "array max size exceeded");
+ /* We always pack arrays if the datatype allows it. */
if (PB_LTYPE(field->type) <= PB_LTYPE_LAST_PACKABLE)
{
if (!pb_encode_tag(stream, PB_WT_STRING, field->tag))
size = 8 * count;
}
else
- {
+ {
pb_ostream_t sizestream = PB_OSTREAM_SIZING;
p = pData;
for (i = 0; i < count; i++)
{
if (!pb_encode_tag_for_field(stream, field))
return false;
- if (!func(stream, field, p))
- return false;
+
+ /* Normally the data is stored directly in the array entries, but
+ * for pointer-type string and bytes fields, the array entries are
+ * actually pointers themselves also. So we have to dereference once
+ * more to get to the actual data. */
+ if (PB_ATYPE(field->type) == PB_ATYPE_POINTER &&
+ (PB_LTYPE(field->type) == PB_LTYPE_STRING ||
+ PB_LTYPE(field->type) == PB_LTYPE_BYTES))
+ {
+ if (!func(stream, field, *(const void* const*)p))
+ return false;
+ }
+ else
+ {
+ if (!func(stream, field, p))
+ return false;
+ }
p = (const char*)p + field->data_size;
}
}
return true;
}
-bool checkreturn encode_static_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData)
+/* Encode a field with static or pointer allocation, i.e. one whose data
+ * is available to the encoder directly. */
+static bool checkreturn encode_basic_field(pb_ostream_t *stream,
+ const pb_field_t *field, const void *pData)
{
pb_encoder_t func;
const void *pSize;
+ bool implicit_has = true;
func = PB_ENCODERS[PB_LTYPE(field->type)];
- pSize = (const char*)pData + field->size_offset;
+ if (field->size_offset)
+ pSize = (const char*)pData + field->size_offset;
+ else
+ pSize = &implicit_has;
+
+ if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
+ {
+ /* pData is a pointer to the field, which contains pointer to
+ * the data. If the 2nd pointer is NULL, it is interpreted as if
+ * the has_field was false.
+ */
+
+ pData = *(const void* const*)pData;
+ implicit_has = (pData != NULL);
+ }
+
switch (PB_HTYPE(field->type))
{
case PB_HTYPE_REQUIRED:
+ if (!pData)
+ PB_RETURN_ERROR(stream, "missing required field");
if (!pb_encode_tag_for_field(stream, field))
return false;
if (!func(stream, field, pData))
break;
case PB_HTYPE_REPEATED:
- if (!encode_array(stream, field, pData, *(const size_t*)pSize, func))
+ if (!encode_array(stream, field, pData, *(const pb_size_t*)pSize, func))
return false;
break;
return true;
}
-bool checkreturn encode_callback_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData)
+/* Encode a field with callback semantics. This means that a user function is
+ * called to provide and encode the actual data. */
+static bool checkreturn encode_callback_field(pb_ostream_t *stream,
+ const pb_field_t *field, const void *pData)
{
const pb_callback_t *callback = (const pb_callback_t*)pData;
+
+#ifdef PB_OLD_CALLBACK_STYLE
+ const void *arg = callback->arg;
+#else
+ void * const *arg = &(callback->arg);
+#endif
+
if (callback->funcs.encode != NULL)
{
- if (!callback->funcs.encode(stream, field, callback->arg))
+ if (!callback->funcs.encode(stream, field, arg))
PB_RETURN_ERROR(stream, "callback error");
}
return true;
}
-bool checkreturn pb_encode(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct)
+/* Encode a single field of any callback or static type. */
+static bool checkreturn encode_field(pb_ostream_t *stream,
+ const pb_field_t *field, const void *pData)
{
- const pb_field_t *field = fields;
- const void *pData = src_struct;
- size_t prev_size = 0;
+ switch (PB_ATYPE(field->type))
+ {
+ case PB_ATYPE_STATIC:
+ case PB_ATYPE_POINTER:
+ return encode_basic_field(stream, field, pData);
+
+ case PB_ATYPE_CALLBACK:
+ return encode_callback_field(stream, field, pData);
+
+ default:
+ PB_RETURN_ERROR(stream, "invalid field type");
+ }
+}
+
+/* Default handler for extension fields. Expects to have a pb_field_t
+ * pointer in the extension->type->arg field. */
+static bool checkreturn default_extension_encoder(pb_ostream_t *stream,
+ const pb_extension_t *extension)
+{
+ const pb_field_t *field = (const pb_field_t*)extension->type->arg;
+
+ if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
+ {
+ /* For pointer extensions, the pointer is stored directly
+ * in the extension structure. This avoids having an extra
+ * indirection. */
+ return encode_field(stream, field, &extension->dest);
+ }
+ else
+ {
+ return encode_field(stream, field, extension->dest);
+ }
+}
+
+/* Walk through all the registered extensions and give them a chance
+ * to encode themselves. */
+static bool checkreturn encode_extension_field(pb_ostream_t *stream,
+ const pb_field_t *field, const void *pData)
+{
+ const pb_extension_t *extension = *(const pb_extension_t* const *)pData;
+ PB_UNUSED(field);
- while (field->tag != 0)
+ while (extension)
{
- pData = (const char*)pData + prev_size + field->data_offset;
- prev_size = field->data_size;
+ bool status;
+ if (extension->type->encode)
+ status = extension->type->encode(stream, extension);
+ else
+ status = default_extension_encoder(stream, extension);
+
+ if (!status)
+ return false;
- /* Special case for static arrays */
- if (PB_ATYPE(field->type) == PB_ATYPE_STATIC &&
- PB_HTYPE(field->type) == PB_HTYPE_REPEATED)
+ extension = extension->next;
+ }
+
+ return true;
+}
+
+/*********************
+ * Encode all fields *
+ *********************/
+
+static void *remove_const(const void *p)
+{
+ /* Note: this casts away const, in order to use the common field iterator
+ * logic for both encoding and decoding. */
+ union {
+ void *p1;
+ const void *p2;
+ } t;
+ t.p2 = p;
+ return t.p1;
+}
+
+bool checkreturn pb_encode(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct)
+{
+ pb_field_iter_t iter;
+ if (!pb_field_iter_begin(&iter, fields, remove_const(src_struct)))
+ return true; /* Empty message type */
+
+ do {
+ if (PB_LTYPE(iter.pos->type) == PB_LTYPE_EXTENSION)
{
- prev_size *= field->array_size;
+ /* Special case for the extension field placeholder */
+ if (!encode_extension_field(stream, iter.pos, iter.pData))
+ return false;
}
-
- switch (PB_ATYPE(field->type))
+ else
{
- case PB_ATYPE_STATIC:
- if (!encode_static_field(stream, field, pData))
- return false;
- break;
-
- case PB_ATYPE_CALLBACK:
- if (!encode_callback_field(stream, field, pData))
- return false;
- break;
-
- default:
- PB_RETURN_ERROR(stream, "invalid field type");
+ /* Regular field */
+ if (!encode_field(stream, iter.pos, iter.pData))
+ return false;
}
+ } while (pb_field_iter_next(&iter));
- field++;
- }
+ return true;
+}
+
+bool pb_encode_delimited(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct)
+{
+ return pb_encode_submessage(stream, fields, src_struct);
+}
+
+bool pb_get_encoded_size(size_t *size, const pb_field_t fields[], const void *src_struct)
+{
+ pb_ostream_t stream = PB_OSTREAM_SIZING;
+ if (!pb_encode(&stream, fields, src_struct))
+ return false;
+
+ *size = stream.bytes_written;
return true;
}
-/* Helper functions */
+/********************
+ * Helper functions *
+ ********************/
bool checkreturn pb_encode_varint(pb_ostream_t *stream, uint64_t value)
{
uint8_t buffer[10];
{
uint64_t zigzagged;
if (value < 0)
- zigzagged = (uint64_t)(~(value << 1));
+ zigzagged = ~((uint64_t)value << 1);
else
- zigzagged = (uint64_t)(value << 1);
+ zigzagged = (uint64_t)value << 1;
return pb_encode_varint(stream, zigzagged);
}
bool checkreturn pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, uint32_t field_number)
{
- uint64_t tag = wiretype | (field_number << 3);
+ uint64_t tag = ((uint64_t)field_number << 3) | wiretype;
return pb_encode_varint(stream, tag);
}
switch (PB_LTYPE(field->type))
{
case PB_LTYPE_VARINT:
+ case PB_LTYPE_UVARINT:
case PB_LTYPE_SVARINT:
wiretype = PB_WT_VARINT;
break;
bool status;
if (!pb_encode(&substream, fields, src_struct))
+ {
+#ifndef PB_NO_ERRMSG
+ stream->errmsg = substream.errmsg;
+#endif
return false;
+ }
size = substream.bytes_written;
/* Field encoders */
-bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ int64_t value = 0;
+
+ /* Cases 1 and 2 are for compilers that have smaller types for bool
+ * or enums, and for int_size option. */
+ switch (field->data_size)
+ {
+ case 1: value = *(const int8_t*)src; break;
+ case 2: value = *(const int16_t*)src; break;
+ case 4: value = *(const int32_t*)src; break;
+ case 8: value = *(const int64_t*)src; break;
+ default: PB_RETURN_ERROR(stream, "invalid data_size");
+ }
+
+ return pb_encode_varint(stream, (uint64_t)value);
+}
+
+static bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
uint64_t value = 0;
return pb_encode_varint(stream, value);
}
-bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
int64_t value = 0;
switch (field->data_size)
{
+ case 1: value = *(const int8_t*)src; break;
+ case 2: value = *(const int16_t*)src; break;
case 4: value = *(const int32_t*)src; break;
case 8: value = *(const int64_t*)src; break;
default: PB_RETURN_ERROR(stream, "invalid data_size");
return pb_encode_svarint(stream, value);
}
-bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
- UNUSED(field);
+ PB_UNUSED(field);
return pb_encode_fixed64(stream, src);
}
-bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
- UNUSED(field);
+ PB_UNUSED(field);
return pb_encode_fixed32(stream, src);
}
-bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)src;
- UNUSED(field);
+
+ if (src == NULL)
+ {
+ /* Threat null pointer as an empty bytes field */
+ return pb_encode_string(stream, NULL, 0);
+ }
+
+ if (PB_ATYPE(field->type) == PB_ATYPE_STATIC &&
+ PB_BYTES_ARRAY_T_ALLOCSIZE(bytes->size) > field->data_size)
+ {
+ PB_RETURN_ERROR(stream, "bytes size exceeded");
+ }
+
return pb_encode_string(stream, bytes->bytes, bytes->size);
}
-bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
- UNUSED(field);
- return pb_encode_string(stream, (const uint8_t*)src, strlen((const char*)src));
+ size_t size = 0;
+ size_t max_size = field->data_size;
+ const char *p = (const char*)src;
+
+ if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
+ max_size = (size_t)-1;
+
+ if (src == NULL)
+ {
+ size = 0; /* Threat null pointer as an empty string */
+ }
+ else
+ {
+ /* strnlen() is not always available, so just use a loop */
+ while (size < max_size && *p != '\0')
+ {
+ size++;
+ p++;
+ }
+ }
+
+ return pb_encode_string(stream, (const uint8_t*)src, size);
}
-bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src)
{
if (field->ptr == NULL)
PB_RETURN_ERROR(stream, "invalid field descriptor");
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