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Add pb_decode_noinit and use it from pb_dec_submessage.

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This avoids double initialization when decoding nested submessages.

Update issue 28
Status: FixedInGit
This commit is contained in:
Petteri Aimonen
2012-08-26 09:56:11 +03:00
parent 440da6959f
commit f1d7640fe1
3 changed files with 24 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
docs/reference.rst
View File

@@ -322,6 +322,16 @@ In addition to EOF, the pb_decode implementation supports terminating a message
For optional fields, this function applies the default value and sets *has_<field>* to false if the field is not present. For optional fields, this function applies the default value and sets *has_<field>* to false if the field is not present.
pb_decode_noinit
----------------
Same as `pb_decode`_, except does not apply the default values to fields. ::
bool pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct);
(parameters are the same as for `pb_decode`_.)
The destination structure should be filled with zeros before calling this function. Doing a *memset* manually can be slightly faster than using `pb_decode`_ if you don't need any default values.
pb_skip_varint pb_skip_varint
-------------- --------------
Skip a varint_ encoded integer without decoding it. :: Skip a varint_ encoded integer without decoding it. ::

12
pb_decode.c
View File

@@ -415,13 +415,11 @@ static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_str
* Decode all fields * * Decode all fields *
*********************/ *********************/
bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct) bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
{ {
uint8_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 7) / 8] = {0}; /* Used to check for required fields */ uint8_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 7) / 8] = {0}; /* Used to check for required fields */
pb_field_iterator_t iter; pb_field_iterator_t iter;
pb_message_set_to_defaults(fields, dest_struct);
pb_field_init(&iter, fields, dest_struct); pb_field_init(&iter, fields, dest_struct);
while (stream->bytes_left) while (stream->bytes_left)
@@ -470,6 +468,12 @@ bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void
return true; return true;
} }
bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
{
pb_message_set_to_defaults(fields, dest_struct);
return pb_decode_noinit(stream, fields, dest_struct);
}
/* Field decoders */ /* Field decoders */
bool pb_decode_svarint(pb_istream_t *stream, int64_t *dest) bool pb_decode_svarint(pb_istream_t *stream, int64_t *dest)
@@ -615,7 +619,7 @@ bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field
if (field->ptr == NULL) if (field->ptr == NULL)
PB_RETURN_ERROR(stream, "invalid field descriptor"); PB_RETURN_ERROR(stream, "invalid field descriptor");
status = pb_decode(&substream, (pb_field_t*)field->ptr, dest); status = pb_decode_noinit(&substream, (pb_field_t*)field->ptr, dest);
pb_close_string_substream(stream, &substream); pb_close_string_substream(stream, &substream);
return status; return status;
} }

6
pb_decode.h
View File

@@ -48,6 +48,12 @@ bool pb_read(pb_istream_t *stream, uint8_t *buf, size_t count);
*/ */
bool pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct); bool pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct);
/* Same as pb_decode, except does not initialize the destination structure
* to default values. This is slightly faster if you need no default values
* and just do memset(struct, 0, sizeof(struct)) yourself.
*/
bool pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct);
/* --- Helper functions --- /* --- Helper functions ---
* You may want to use these from your caller or callbacks. * You may want to use these from your caller or callbacks.
*/ */