* 2011 Petteri Aimonen <jpa@kapsi.fi>
*/
-#define NANOPB_INTERNALS
#include "pb.h"
#include "pb_encode.h"
+#include "pb_common.h"
/* 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
**************************************/
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 buf_write(pb_ostream_t *stream, const pb_byte_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 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);
+static bool checkreturn pb_enc_fixed_length_bytes(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.
&pb_enc_bytes,
&pb_enc_string,
&pb_enc_submessage,
- NULL /* extensions */
+ NULL, /* extensions */
+ &pb_enc_fixed_length_bytes
};
/*******************************
* pb_ostream_t implementation *
*******************************/
-static bool checkreturn buf_write(pb_ostream_t *stream, const uint8_t *buf, size_t count)
+static bool checkreturn buf_write(pb_ostream_t *stream, const pb_byte_t *buf, size_t count)
{
- uint8_t *dest = (uint8_t*)stream->state;
+ size_t i;
+ pb_byte_t *dest = (pb_byte_t*)stream->state;
stream->state = dest + count;
- while (count--)
- *dest++ = *buf++;
+ for (i = 0; i < count; i++)
+ dest[i] = buf[i];
return true;
}
-pb_ostream_t pb_ostream_from_buffer(uint8_t *buf, size_t bufsize)
+pb_ostream_t pb_ostream_from_buffer(pb_byte_t *buf, size_t bufsize)
{
pb_ostream_t stream;
#ifdef PB_BUFFER_ONLY
return stream;
}
-bool checkreturn pb_write(pb_ostream_t *stream, const uint8_t *buf, size_t count)
+bool checkreturn pb_write(pb_ostream_t *stream, const pb_byte_t *buf, size_t count)
{
if (stream->callback != NULL)
{
return true;
}
+/* In proto3, all fields are optional and are only encoded if their value is "non-zero".
+ * This function implements the check for the zero value. */
+static bool pb_check_proto3_default_value(const pb_field_t *field, const void *pData)
+{
+ if(PB_LTYPE(field->type) == PB_LTYPE_BYTES)
+ {
+ const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)pData;
+ return bytes->size == 0;
+ }
+ else if (PB_LTYPE(field->type) == PB_LTYPE_STRING)
+ {
+ return *(const char*)pData == '\0';
+ }
+ else if (PB_LTYPE(field->type) == PB_LTYPE_FIXED_LENGTH_BYTES)
+ {
+ /* Fixed length bytes is only empty if its length is fixed
+ * as 0. Which would be pretty strange, but we can check
+ * it anyway. */
+ return field->data_size == 0;
+ }
+ else
+ {
+ /* PB_LTYPE_VARINT, UVARINT, SVARINT, FIXED32, FIXED64,
+ * SUBMESSAGE, EXTENSION: These all have integer or pointer
+ * value which can be compared with 0. This does the check
+ * byte-by-byte to avoid the switch-cast logic used in
+ * pb_enc_varint(). (Casting to char* is safe with regards
+ * to C strict aliasing rules.)
+ */
+ uint_fast8_t i;
+ const char *p = (const char*)pData;
+ for (i = 0; i < field->data_size; i++)
+ {
+ if (p[i] != 0)
+ {
+ return false;
+ }
+ }
+
+ return true;
+ }
+}
+
/* 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;
+ bool implicit_has;
+ const void *pSize = &implicit_has;
func = PB_ENCODERS[PB_LTYPE(field->type)];
if (field->size_offset)
+ {
+ /* Static optional, repeated or oneof field */
pSize = (const char*)pData + field->size_offset;
+ }
+ else if (PB_HTYPE(field->type) == PB_HTYPE_OPTIONAL)
+ {
+ /* Proto3 style field, optional but without explicit has_ field. */
+ implicit_has = !pb_check_proto3_default_value(field, pData);
+ }
else
- pSize = &implicit_has;
+ {
+ /* Required field, always present */
+ implicit_has = true;
+ }
if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
{
* 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);
}
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;
+ case PB_HTYPE_ONEOF:
+ if (*(const pb_size_t*)pSize == field->tag)
+ {
+ if (!pb_encode_tag_for_field(stream, field))
+ return false;
+
+ if (!func(stream, field, pData))
+ return false;
+ }
+ break;
+
default:
PB_RETURN_ERROR(stream, "invalid field type");
}
const pb_extension_t *extension)
{
const pb_field_t *field = (const pb_field_t*)extension->type->arg;
- return encode_field(stream, field, extension->dest);
+
+ 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
const pb_field_t *field, const void *pData)
{
const pb_extension_t *extension = *(const pb_extension_t* const *)pData;
- UNUSED(field);
+ PB_UNUSED(field);
while (extension)
{
* 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)
{
- const pb_field_t *field = fields;
- const void *pData = src_struct;
- size_t prev_size = 0;
+ pb_field_iter_t iter;
+ if (!pb_field_iter_begin(&iter, fields, remove_const(src_struct)))
+ return true; /* Empty message type */
- while (field->tag != 0)
- {
- pData = (const char*)pData + prev_size + field->data_offset;
- if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
- prev_size = sizeof(const void*);
- else
- prev_size = field->data_size;
-
- /* Special case for static arrays */
- if (PB_ATYPE(field->type) == PB_ATYPE_STATIC &&
- PB_HTYPE(field->type) == PB_HTYPE_REPEATED)
- {
- prev_size *= field->array_size;
- }
-
- if (PB_LTYPE(field->type) == PB_LTYPE_EXTENSION)
+ do {
+ if (PB_LTYPE(iter.pos->type) == PB_LTYPE_EXTENSION)
{
/* Special case for the extension field placeholder */
- if (!encode_extension_field(stream, field, pData))
+ if (!encode_extension_field(stream, iter.pos, iter.pData))
return false;
}
else
{
/* Regular field */
- if (!encode_field(stream, field, pData))
+ if (!encode_field(stream, iter.pos, iter.pData))
return false;
}
-
- field++;
- }
+ } while (pb_field_iter_next(&iter));
return true;
}
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 *
********************/
bool checkreturn pb_encode_varint(pb_ostream_t *stream, uint64_t value)
{
- uint8_t buffer[10];
+ pb_byte_t buffer[10];
size_t i = 0;
- if (value == 0)
- return pb_write(stream, (uint8_t*)&value, 1);
+ if (value <= 0x7F)
+ {
+ pb_byte_t v = (pb_byte_t)value;
+ return pb_write(stream, &v, 1);
+ }
while (value)
{
- buffer[i] = (uint8_t)((value & 0x7F) | 0x80);
+ buffer[i] = (pb_byte_t)((value & 0x7F) | 0x80);
value >>= 7;
i++;
}
bool checkreturn pb_encode_fixed32(pb_ostream_t *stream, const void *value)
{
- #ifdef __BIG_ENDIAN__
- const uint8_t *bytes = value;
- uint8_t lebytes[4];
- lebytes[0] = bytes[3];
- lebytes[1] = bytes[2];
- lebytes[2] = bytes[1];
- lebytes[3] = bytes[0];
- return pb_write(stream, lebytes, 4);
- #else
- return pb_write(stream, (const uint8_t*)value, 4);
- #endif
+ uint32_t val = *(const uint32_t*)value;
+ pb_byte_t bytes[4];
+ bytes[0] = (pb_byte_t)(val & 0xFF);
+ bytes[1] = (pb_byte_t)((val >> 8) & 0xFF);
+ bytes[2] = (pb_byte_t)((val >> 16) & 0xFF);
+ bytes[3] = (pb_byte_t)((val >> 24) & 0xFF);
+ return pb_write(stream, bytes, 4);
}
bool checkreturn pb_encode_fixed64(pb_ostream_t *stream, const void *value)
{
- #ifdef __BIG_ENDIAN__
- const uint8_t *bytes = value;
- uint8_t lebytes[8];
- lebytes[0] = bytes[7];
- lebytes[1] = bytes[6];
- lebytes[2] = bytes[5];
- lebytes[3] = bytes[4];
- lebytes[4] = bytes[3];
- lebytes[5] = bytes[2];
- lebytes[6] = bytes[1];
- lebytes[7] = bytes[0];
- return pb_write(stream, lebytes, 8);
- #else
- return pb_write(stream, (const uint8_t*)value, 8);
- #endif
+ uint64_t val = *(const uint64_t*)value;
+ pb_byte_t bytes[8];
+ bytes[0] = (pb_byte_t)(val & 0xFF);
+ bytes[1] = (pb_byte_t)((val >> 8) & 0xFF);
+ bytes[2] = (pb_byte_t)((val >> 16) & 0xFF);
+ bytes[3] = (pb_byte_t)((val >> 24) & 0xFF);
+ bytes[4] = (pb_byte_t)((val >> 32) & 0xFF);
+ bytes[5] = (pb_byte_t)((val >> 40) & 0xFF);
+ bytes[6] = (pb_byte_t)((val >> 48) & 0xFF);
+ bytes[7] = (pb_byte_t)((val >> 56) & 0xFF);
+ return pb_write(stream, bytes, 8);
}
bool checkreturn pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, uint32_t field_number)
case PB_LTYPE_BYTES:
case PB_LTYPE_STRING:
case PB_LTYPE_SUBMESSAGE:
+ case PB_LTYPE_FIXED_LENGTH_BYTES:
wiretype = PB_WT_STRING;
break;
return pb_encode_tag(stream, wiretype, field->tag);
}
-bool checkreturn pb_encode_string(pb_ostream_t *stream, const uint8_t *buffer, size_t size)
+bool checkreturn pb_encode_string(pb_ostream_t *stream, const pb_byte_t *buffer, size_t size)
{
if (!pb_encode_varint(stream, (uint64_t)size))
return false;
/* 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. */
- 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");
- }
+ if (field->data_size == sizeof(int_least8_t))
+ value = *(const int_least8_t*)src;
+ else if (field->data_size == sizeof(int_least16_t))
+ value = *(const int_least16_t*)src;
+ else if (field->data_size == sizeof(int32_t))
+ value = *(const int32_t*)src;
+ else if (field->data_size == sizeof(int64_t))
+ value = *(const int64_t*)src;
+ else
+ PB_RETURN_ERROR(stream, "invalid data_size");
return pb_encode_varint(stream, (uint64_t)value);
}
-bool checkreturn pb_enc_uvarint(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)
{
uint64_t value = 0;
- switch (field->data_size)
- {
- case 4: value = *(const uint32_t*)src; break;
- case 8: value = *(const uint64_t*)src; break;
- default: PB_RETURN_ERROR(stream, "invalid data_size");
- }
+ if (field->data_size == sizeof(uint_least8_t))
+ value = *(const uint_least8_t*)src;
+ else if (field->data_size == sizeof(uint_least16_t))
+ value = *(const uint_least16_t*)src;
+ else if (field->data_size == sizeof(uint32_t))
+ value = *(const uint32_t*)src;
+ else if (field->data_size == sizeof(uint64_t))
+ value = *(const uint64_t*)src;
+ else
+ PB_RETURN_ERROR(stream, "invalid data_size");
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 4: value = *(const int32_t*)src; break;
- case 8: value = *(const int64_t*)src; break;
- default: PB_RETURN_ERROR(stream, "invalid data_size");
- }
+ if (field->data_size == sizeof(int_least8_t))
+ value = *(const int_least8_t*)src;
+ else if (field->data_size == sizeof(int_least16_t))
+ value = *(const int_least16_t*)src;
+ else if (field->data_size == sizeof(int32_t))
+ value = *(const int32_t*)src;
+ else if (field->data_size == sizeof(int64_t))
+ value = *(const int64_t*)src;
+ else
+ 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;
+ const pb_bytes_array_t *bytes = NULL;
+
+ bytes = (const pb_bytes_array_t*)src;
if (src == NULL)
{
- /* Threat null pointer as an empty bytes field */
+ /* Treat null pointer as an empty bytes field */
return pb_encode_string(stream, NULL, 0);
}
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)
{
- /* strnlen() is not always available, so just use a loop */
size_t size = 0;
size_t max_size = field->data_size;
const char *p = (const char*)src;
if (src == NULL)
{
- size = 0; /* Threat null pointer as an empty string */
+ size = 0; /* Treat null pointer as an empty string */
}
else
{
+ /* strnlen() is not always available, so just use a loop */
while (size < max_size && *p != '\0')
{
size++;
}
}
- return pb_encode_string(stream, (const uint8_t*)src, size);
+ return pb_encode_string(stream, (const pb_byte_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");
return pb_encode_submessage(stream, (const pb_field_t*)field->ptr, src);
}
+static bool checkreturn pb_enc_fixed_length_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src)
+{
+ return pb_encode_string(stream, (const pb_byte_t*)src, field->data_size);
+}
+
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