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668 lines
19 KiB
668 lines
19 KiB
![]()
10 years ago
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/* pb_encode.c -- encode a protobuf using minimal resources
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*
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* 2011 Petteri Aimonen <jpa@kapsi.fi>
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*/
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#include "pb.h"
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#include "pb_encode.h"
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/* Use the GCC warn_unused_result attribute to check that all return values
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* are propagated correctly. On other compilers and gcc before 3.4.0 just
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* ignore the annotation.
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*/
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#if !defined(__GNUC__) || ( __GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 4)
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#define checkreturn
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#else
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#define checkreturn __attribute__((warn_unused_result))
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#endif
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/**************************************
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* Declarations internal to this file *
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**************************************/
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typedef bool (*pb_encoder_t)(pb_ostream_t *stream, const pb_field_t *field, const void *src) checkreturn;
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static bool checkreturn buf_write(pb_ostream_t *stream, const uint8_t *buf, size_t count);
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static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *field, const void *pData, size_t count, pb_encoder_t func);
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static bool checkreturn encode_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData);
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static bool checkreturn default_extension_encoder(pb_ostream_t *stream, const pb_extension_t *extension);
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static bool checkreturn encode_extension_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData);
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static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src);
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/* --- Function pointers to field encoders ---
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* Order in the array must match pb_action_t LTYPE numbering.
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*/
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static const pb_encoder_t PB_ENCODERS[PB_LTYPES_COUNT] = {
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&pb_enc_varint,
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&pb_enc_uvarint,
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&pb_enc_svarint,
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&pb_enc_fixed32,
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&pb_enc_fixed64,
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&pb_enc_bytes,
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&pb_enc_string,
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&pb_enc_submessage,
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NULL /* extensions */
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};
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/*******************************
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* pb_ostream_t implementation *
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*******************************/
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static bool checkreturn buf_write(pb_ostream_t *stream, const uint8_t *buf, size_t count)
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{
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uint8_t *dest = (uint8_t*)stream->state;
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stream->state = dest + count;
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while (count--)
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*dest++ = *buf++;
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return true;
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}
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pb_ostream_t pb_ostream_from_buffer(uint8_t *buf, size_t bufsize)
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{
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pb_ostream_t stream;
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#ifdef PB_BUFFER_ONLY
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stream.callback = (void*)1; /* Just a marker value */
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#else
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stream.callback = &buf_write;
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#endif
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stream.state = buf;
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stream.max_size = bufsize;
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stream.bytes_written = 0;
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#ifndef PB_NO_ERRMSG
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stream.errmsg = NULL;
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#endif
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return stream;
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}
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bool checkreturn pb_write(pb_ostream_t *stream, const uint8_t *buf, size_t count)
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{
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if (stream->callback != NULL)
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{
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if (stream->bytes_written + count > stream->max_size)
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PB_RETURN_ERROR(stream, "stream full");
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#ifdef PB_BUFFER_ONLY
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if (!buf_write(stream, buf, count))
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PB_RETURN_ERROR(stream, "io error");
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#else
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if (!stream->callback(stream, buf, count))
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PB_RETURN_ERROR(stream, "io error");
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#endif
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}
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stream->bytes_written += count;
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return true;
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}
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/*************************
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* Encode a single field *
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*************************/
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/* Encode a static array. Handles the size calculations and possible packing. */
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static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *field,
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const void *pData, size_t count, pb_encoder_t func)
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{
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size_t i;
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const void *p;
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size_t size;
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if (count == 0)
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return true;
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if (PB_ATYPE(field->type) != PB_ATYPE_POINTER && count > field->array_size)
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PB_RETURN_ERROR(stream, "array max size exceeded");
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/* We always pack arrays if the datatype allows it. */
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if (PB_LTYPE(field->type) <= PB_LTYPE_LAST_PACKABLE)
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{
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if (!pb_encode_tag(stream, PB_WT_STRING, field->tag))
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return false;
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/* Determine the total size of packed array. */
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if (PB_LTYPE(field->type) == PB_LTYPE_FIXED32)
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{
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size = 4 * count;
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}
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else if (PB_LTYPE(field->type) == PB_LTYPE_FIXED64)
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{
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size = 8 * count;
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}
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else
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{
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pb_ostream_t sizestream = PB_OSTREAM_SIZING;
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p = pData;
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for (i = 0; i < count; i++)
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{
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if (!func(&sizestream, field, p))
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return false;
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p = (const char*)p + field->data_size;
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}
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size = sizestream.bytes_written;
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}
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if (!pb_encode_varint(stream, (uint64_t)size))
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return false;
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if (stream->callback == NULL)
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return pb_write(stream, NULL, size); /* Just sizing.. */
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/* Write the data */
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p = pData;
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for (i = 0; i < count; i++)
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{
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if (!func(stream, field, p))
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return false;
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p = (const char*)p + field->data_size;
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}
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}
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else
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{
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p = pData;
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for (i = 0; i < count; i++)
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{
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if (!pb_encode_tag_for_field(stream, field))
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return false;
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/* Normally the data is stored directly in the array entries, but
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* for pointer-type string and bytes fields, the array entries are
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* actually pointers themselves also. So we have to dereference once
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* more to get to the actual data. */
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if (PB_ATYPE(field->type) == PB_ATYPE_POINTER &&
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(PB_LTYPE(field->type) == PB_LTYPE_STRING ||
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PB_LTYPE(field->type) == PB_LTYPE_BYTES))
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{
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if (!func(stream, field, *(const void* const*)p))
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return false;
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}
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else
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{
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if (!func(stream, field, p))
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return false;
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}
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p = (const char*)p + field->data_size;
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}
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}
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return true;
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}
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/* Encode a field with static or pointer allocation, i.e. one whose data
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* is available to the encoder directly. */
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static bool checkreturn encode_basic_field(pb_ostream_t *stream,
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const pb_field_t *field, const void *pData)
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{
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pb_encoder_t func;
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const void *pSize;
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bool implicit_has = true;
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func = PB_ENCODERS[PB_LTYPE(field->type)];
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if (field->size_offset)
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pSize = (const char*)pData + field->size_offset;
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else
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pSize = &implicit_has;
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if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
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{
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/* pData is a pointer to the field, which contains pointer to
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* the data. If the 2nd pointer is NULL, it is interpreted as if
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* the has_field was false.
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*/
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pData = *(const void* const*)pData;
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implicit_has = (pData != NULL);
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}
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switch (PB_HTYPE(field->type))
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{
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case PB_HTYPE_REQUIRED:
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if (!pData)
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PB_RETURN_ERROR(stream, "missing required field");
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if (!pb_encode_tag_for_field(stream, field))
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return false;
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if (!func(stream, field, pData))
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return false;
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break;
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case PB_HTYPE_OPTIONAL:
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if (*(const bool*)pSize)
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{
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if (!pb_encode_tag_for_field(stream, field))
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return false;
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if (!func(stream, field, pData))
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return false;
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}
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break;
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case PB_HTYPE_REPEATED:
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if (!encode_array(stream, field, pData, *(const size_t*)pSize, func))
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return false;
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break;
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default:
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PB_RETURN_ERROR(stream, "invalid field type");
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}
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return true;
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}
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/* Encode a field with callback semantics. This means that a user function is
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* called to provide and encode the actual data. */
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static bool checkreturn encode_callback_field(pb_ostream_t *stream,
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const pb_field_t *field, const void *pData)
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{
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const pb_callback_t *callback = (const pb_callback_t*)pData;
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#ifdef PB_OLD_CALLBACK_STYLE
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const void *arg = callback->arg;
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#else
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void * const *arg = &(callback->arg);
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#endif
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if (callback->funcs.encode != NULL)
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{
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if (!callback->funcs.encode(stream, field, arg))
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PB_RETURN_ERROR(stream, "callback error");
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}
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return true;
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}
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/* Encode a single field of any callback or static type. */
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static bool checkreturn encode_field(pb_ostream_t *stream,
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const pb_field_t *field, const void *pData)
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{
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switch (PB_ATYPE(field->type))
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{
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case PB_ATYPE_STATIC:
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case PB_ATYPE_POINTER:
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return encode_basic_field(stream, field, pData);
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case PB_ATYPE_CALLBACK:
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return encode_callback_field(stream, field, pData);
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default:
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PB_RETURN_ERROR(stream, "invalid field type");
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}
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}
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/* Default handler for extension fields. Expects to have a pb_field_t
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* pointer in the extension->type->arg field. */
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static bool checkreturn default_extension_encoder(pb_ostream_t *stream,
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const pb_extension_t *extension)
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{
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const pb_field_t *field = (const pb_field_t*)extension->type->arg;
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return encode_field(stream, field, extension->dest);
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}
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/* Walk through all the registered extensions and give them a chance
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* to encode themselves. */
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static bool checkreturn encode_extension_field(pb_ostream_t *stream,
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const pb_field_t *field, const void *pData)
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{
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const pb_extension_t *extension = *(const pb_extension_t* const *)pData;
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UNUSED(field);
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while (extension)
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{
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bool status;
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if (extension->type->encode)
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status = extension->type->encode(stream, extension);
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else
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status = default_extension_encoder(stream, extension);
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if (!status)
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return false;
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extension = extension->next;
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}
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return true;
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}
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/*********************
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* Encode all fields *
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*********************/
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bool checkreturn pb_encode(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct)
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{
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const pb_field_t *field = fields;
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const void *pData = src_struct;
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size_t prev_size = 0;
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while (field->tag != 0)
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{
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pData = (const char*)pData + prev_size + field->data_offset;
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if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
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prev_size = sizeof(const void*);
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else
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prev_size = field->data_size;
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/* Special case for static arrays */
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if (PB_ATYPE(field->type) == PB_ATYPE_STATIC &&
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PB_HTYPE(field->type) == PB_HTYPE_REPEATED)
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{
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prev_size *= field->array_size;
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}
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if (PB_LTYPE(field->type) == PB_LTYPE_EXTENSION)
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{
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/* Special case for the extension field placeholder */
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if (!encode_extension_field(stream, field, pData))
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return false;
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}
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else
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{
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/* Regular field */
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if (!encode_field(stream, field, pData))
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return false;
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}
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field++;
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}
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return true;
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}
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bool pb_encode_delimited(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct)
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{
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return pb_encode_submessage(stream, fields, src_struct);
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}
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bool pb_get_encoded_size(size_t *size, const pb_field_t fields[], const void *src_struct)
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{
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pb_ostream_t stream = PB_OSTREAM_SIZING;
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if (!pb_encode(&stream, fields, src_struct))
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return false;
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*size = stream.bytes_written;
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return true;
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}
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/********************
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* Helper functions *
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********************/
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bool checkreturn pb_encode_varint(pb_ostream_t *stream, uint64_t value)
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{
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uint8_t buffer[10];
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size_t i = 0;
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if (value == 0)
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return pb_write(stream, (uint8_t*)&value, 1);
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while (value)
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{
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buffer[i] = (uint8_t)((value & 0x7F) | 0x80);
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value >>= 7;
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i++;
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}
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buffer[i-1] &= 0x7F; /* Unset top bit on last byte */
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return pb_write(stream, buffer, i);
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}
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bool checkreturn pb_encode_svarint(pb_ostream_t *stream, int64_t value)
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{
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uint64_t zigzagged;
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if (value < 0)
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zigzagged = ~((uint64_t)value << 1);
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else
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zigzagged = (uint64_t)value << 1;
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return pb_encode_varint(stream, zigzagged);
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}
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bool checkreturn pb_encode_fixed32(pb_ostream_t *stream, const void *value)
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{
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#ifdef __BIG_ENDIAN__
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const uint8_t *bytes = value;
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uint8_t lebytes[4];
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lebytes[0] = bytes[3];
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lebytes[1] = bytes[2];
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lebytes[2] = bytes[1];
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lebytes[3] = bytes[0];
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return pb_write(stream, lebytes, 4);
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#else
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||
|
return pb_write(stream, (const uint8_t*)value, 4);
|
||
|
#endif
|
||
|
}
|
||
|
|
||
|
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
|
||
|
}
|
||
|
|
||
|
bool checkreturn pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, uint32_t field_number)
|
||
|
{
|
||
|
uint64_t tag = ((uint64_t)field_number << 3) | wiretype;
|
||
|
return pb_encode_varint(stream, tag);
|
||
|
}
|
||
|
|
||
|
bool checkreturn pb_encode_tag_for_field(pb_ostream_t *stream, const pb_field_t *field)
|
||
|
{
|
||
|
pb_wire_type_t wiretype;
|
||
|
switch (PB_LTYPE(field->type))
|
||
|
{
|
||
|
case PB_LTYPE_VARINT:
|
||
|
case PB_LTYPE_UVARINT:
|
||
|
case PB_LTYPE_SVARINT:
|
||
|
wiretype = PB_WT_VARINT;
|
||
|
break;
|
||
|
|
||
|
case PB_LTYPE_FIXED32:
|
||
|
wiretype = PB_WT_32BIT;
|
||
|
break;
|
||
|
|
||
|
case PB_LTYPE_FIXED64:
|
||
|
wiretype = PB_WT_64BIT;
|
||
|
break;
|
||
|
|
||
|
case PB_LTYPE_BYTES:
|
||
|
case PB_LTYPE_STRING:
|
||
|
case PB_LTYPE_SUBMESSAGE:
|
||
|
wiretype = PB_WT_STRING;
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
PB_RETURN_ERROR(stream, "invalid field type");
|
||
|
}
|
||
|
|
||
|
return pb_encode_tag(stream, wiretype, field->tag);
|
||
|
}
|
||
|
|
||
|
bool checkreturn pb_encode_string(pb_ostream_t *stream, const uint8_t *buffer, size_t size)
|
||
|
{
|
||
|
if (!pb_encode_varint(stream, (uint64_t)size))
|
||
|
return false;
|
||
|
|
||
|
return pb_write(stream, buffer, size);
|
||
|
}
|
||
|
|
||
|
bool checkreturn pb_encode_submessage(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct)
|
||
|
{
|
||
|
/* First calculate the message size using a non-writing substream. */
|
||
|
pb_ostream_t substream = PB_OSTREAM_SIZING;
|
||
|
size_t size;
|
||
|
bool status;
|
||
|
|
||
|
if (!pb_encode(&substream, fields, src_struct))
|
||
|
{
|
||
|
#ifndef PB_NO_ERRMSG
|
||
|
stream->errmsg = substream.errmsg;
|
||
|
#endif
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
size = substream.bytes_written;
|
||
|
|
||
|
if (!pb_encode_varint(stream, (uint64_t)size))
|
||
|
return false;
|
||
|
|
||
|
if (stream->callback == NULL)
|
||
|
return pb_write(stream, NULL, size); /* Just sizing */
|
||
|
|
||
|
if (stream->bytes_written + size > stream->max_size)
|
||
|
PB_RETURN_ERROR(stream, "stream full");
|
||
|
|
||
|
/* Use a substream to verify that a callback doesn't write more than
|
||
|
* what it did the first time. */
|
||
|
substream.callback = stream->callback;
|
||
|
substream.state = stream->state;
|
||
|
substream.max_size = size;
|
||
|
substream.bytes_written = 0;
|
||
|
#ifndef PB_NO_ERRMSG
|
||
|
substream.errmsg = NULL;
|
||
|
#endif
|
||
|
|
||
|
status = pb_encode(&substream, fields, src_struct);
|
||
|
|
||
|
stream->bytes_written += substream.bytes_written;
|
||
|
stream->state = substream.state;
|
||
|
#ifndef PB_NO_ERRMSG
|
||
|
stream->errmsg = substream.errmsg;
|
||
|
#endif
|
||
|
|
||
|
if (substream.bytes_written != size)
|
||
|
PB_RETURN_ERROR(stream, "submsg size changed");
|
||
|
|
||
|
return status;
|
||
|
}
|
||
|
|
||
|
/* Field encoders */
|
||
|
|
||
|
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");
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
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");
|
||
|
}
|
||
|
|
||
|
return pb_encode_varint(stream, value);
|
||
|
}
|
||
|
|
||
|
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");
|
||
|
}
|
||
|
|
||
|
return pb_encode_svarint(stream, value);
|
||
|
}
|
||
|
|
||
|
static bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src)
|
||
|
{
|
||
|
UNUSED(field);
|
||
|
return pb_encode_fixed64(stream, src);
|
||
|
}
|
||
|
|
||
|
static bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src)
|
||
|
{
|
||
|
UNUSED(field);
|
||
|
return pb_encode_fixed32(stream, 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;
|
||
|
|
||
|
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);
|
||
|
}
|
||
|
|
||
|
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 (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
|
||
|
{
|
||
|
while (size < max_size && *p != '\0')
|
||
|
{
|
||
|
size++;
|
||
|
p++;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return pb_encode_string(stream, (const uint8_t*)src, size);
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
}
|
||
|
|