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1348 lines
42 KiB
1348 lines
42 KiB
/* pb_decode.c -- decode 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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/* 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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#include "pb.h"
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#include "pb_decode.h"
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#include "pb_common.h"
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/**************************************
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* Declarations internal to this file *
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**************************************/
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typedef bool (*pb_decoder_t)(pb_istream_t *stream, const pb_field_t *field, void *dest) checkreturn;
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static bool checkreturn buf_read(pb_istream_t *stream, pb_byte_t *buf, size_t count);
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static bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest);
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static bool checkreturn read_raw_value(pb_istream_t *stream, pb_wire_type_t wire_type, pb_byte_t *buf, size_t *size);
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static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter);
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static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter);
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static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter);
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static void iter_from_extension(pb_field_iter_t *iter, pb_extension_t *extension);
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static bool checkreturn default_extension_decoder(pb_istream_t *stream, pb_extension_t *extension, uint32_t tag, pb_wire_type_t wire_type);
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static bool checkreturn decode_extension(pb_istream_t *stream, uint32_t tag, pb_wire_type_t wire_type, pb_field_iter_t *iter);
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static bool checkreturn find_extension_field(pb_field_iter_t *iter);
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static void pb_field_set_to_default(pb_field_iter_t *iter);
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static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct);
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static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_string(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field, void *dest);
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static bool checkreturn pb_skip_varint(pb_istream_t *stream);
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static bool checkreturn pb_skip_string(pb_istream_t *stream);
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#ifdef PB_ENABLE_MALLOC
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static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size);
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static bool checkreturn pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter);
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static void pb_release_single_field(const pb_field_iter_t *iter);
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#endif
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/* --- Function pointers to field decoders ---
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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_decoder_t PB_DECODERS[PB_LTYPES_COUNT] = {
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&pb_dec_varint,
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&pb_dec_uvarint,
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&pb_dec_svarint,
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&pb_dec_fixed32,
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&pb_dec_fixed64,
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&pb_dec_bytes,
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&pb_dec_string,
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&pb_dec_submessage,
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NULL, /* extensions */
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&pb_dec_bytes /* PB_LTYPE_FIXED_LENGTH_BYTES */
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};
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/*******************************
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* pb_istream_t implementation *
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*******************************/
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static bool checkreturn buf_read(pb_istream_t *stream, pb_byte_t *buf, size_t count)
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{
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const pb_byte_t *source = (const pb_byte_t*)stream->state;
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stream->state = (pb_byte_t*)stream->state + count;
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if (buf != NULL)
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{
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while (count--)
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*buf++ = *source++;
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}
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return true;
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}
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bool checkreturn pb_read(pb_istream_t *stream, pb_byte_t *buf, size_t count)
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{
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#ifndef PB_BUFFER_ONLY
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if (buf == NULL && stream->callback != buf_read)
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{
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/* Skip input bytes */
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pb_byte_t tmp[16];
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while (count > 16)
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{
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if (!pb_read(stream, tmp, 16))
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return false;
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count -= 16;
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}
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return pb_read(stream, tmp, count);
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}
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#endif
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if (stream->bytes_left < count)
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PB_RETURN_ERROR(stream, "end-of-stream");
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#ifndef PB_BUFFER_ONLY
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if (!stream->callback(stream, buf, count))
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PB_RETURN_ERROR(stream, "io error");
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#else
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if (!buf_read(stream, buf, count))
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return false;
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#endif
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stream->bytes_left -= count;
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return true;
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}
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/* Read a single byte from input stream. buf may not be NULL.
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* This is an optimization for the varint decoding. */
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static bool checkreturn pb_readbyte(pb_istream_t *stream, pb_byte_t *buf)
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{
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if (stream->bytes_left == 0)
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PB_RETURN_ERROR(stream, "end-of-stream");
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#ifndef PB_BUFFER_ONLY
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if (!stream->callback(stream, buf, 1))
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PB_RETURN_ERROR(stream, "io error");
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#else
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*buf = *(const pb_byte_t*)stream->state;
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stream->state = (pb_byte_t*)stream->state + 1;
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#endif
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stream->bytes_left--;
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return true;
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}
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pb_istream_t pb_istream_from_buffer(const pb_byte_t *buf, size_t bufsize)
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{
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pb_istream_t stream;
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/* Cast away the const from buf without a compiler error. We are
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* careful to use it only in a const manner in the callbacks.
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*/
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union {
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void *state;
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const void *c_state;
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} state;
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#ifdef PB_BUFFER_ONLY
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stream.callback = NULL;
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#else
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stream.callback = &buf_read;
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#endif
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state.c_state = buf;
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stream.state = state.state;
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stream.bytes_left = bufsize;
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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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/********************
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* Helper functions *
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********************/
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static bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest)
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{
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pb_byte_t byte;
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uint32_t result;
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if (!pb_readbyte(stream, &byte))
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return false;
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if ((byte & 0x80) == 0)
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{
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/* Quick case, 1 byte value */
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result = byte;
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}
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else
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{
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/* Multibyte case */
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uint_fast8_t bitpos = 7;
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result = byte & 0x7F;
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do
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{
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if (bitpos >= 32)
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PB_RETURN_ERROR(stream, "varint overflow");
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if (!pb_readbyte(stream, &byte))
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return false;
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result |= (uint32_t)(byte & 0x7F) << bitpos;
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bitpos = (uint_fast8_t)(bitpos + 7);
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} while (byte & 0x80);
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}
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*dest = result;
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return true;
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}
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bool checkreturn pb_decode_varint(pb_istream_t *stream, uint64_t *dest)
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{
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pb_byte_t byte;
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uint_fast8_t bitpos = 0;
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uint64_t result = 0;
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do
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{
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if (bitpos >= 64)
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PB_RETURN_ERROR(stream, "varint overflow");
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if (!pb_readbyte(stream, &byte))
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return false;
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result |= (uint64_t)(byte & 0x7F) << bitpos;
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bitpos = (uint_fast8_t)(bitpos + 7);
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} while (byte & 0x80);
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*dest = result;
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return true;
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}
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bool checkreturn pb_skip_varint(pb_istream_t *stream)
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{
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pb_byte_t byte;
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do
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{
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if (!pb_read(stream, &byte, 1))
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return false;
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} while (byte & 0x80);
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return true;
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}
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bool checkreturn pb_skip_string(pb_istream_t *stream)
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{
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uint32_t length;
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if (!pb_decode_varint32(stream, &length))
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return false;
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return pb_read(stream, NULL, length);
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}
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bool checkreturn pb_decode_tag(pb_istream_t *stream, pb_wire_type_t *wire_type, uint32_t *tag, bool *eof)
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{
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uint32_t temp;
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*eof = false;
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*wire_type = (pb_wire_type_t) 0;
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*tag = 0;
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if (!pb_decode_varint32(stream, &temp))
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{
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if (stream->bytes_left == 0)
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*eof = true;
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return false;
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}
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if (temp == 0)
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{
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*eof = true; /* Special feature: allow 0-terminated messages. */
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return false;
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}
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*tag = temp >> 3;
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*wire_type = (pb_wire_type_t)(temp & 7);
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return true;
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}
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bool checkreturn pb_skip_field(pb_istream_t *stream, pb_wire_type_t wire_type)
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{
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switch (wire_type)
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{
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case PB_WT_VARINT: return pb_skip_varint(stream);
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case PB_WT_64BIT: return pb_read(stream, NULL, 8);
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case PB_WT_STRING: return pb_skip_string(stream);
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case PB_WT_32BIT: return pb_read(stream, NULL, 4);
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default: PB_RETURN_ERROR(stream, "invalid wire_type");
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}
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}
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/* Read a raw value to buffer, for the purpose of passing it to callback as
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* a substream. Size is maximum size on call, and actual size on return.
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*/
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static bool checkreturn read_raw_value(pb_istream_t *stream, pb_wire_type_t wire_type, pb_byte_t *buf, size_t *size)
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{
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size_t max_size = *size;
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switch (wire_type)
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{
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case PB_WT_VARINT:
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*size = 0;
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do
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{
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(*size)++;
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if (*size > max_size) return false;
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if (!pb_read(stream, buf, 1)) return false;
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} while (*buf++ & 0x80);
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return true;
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case PB_WT_64BIT:
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*size = 8;
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return pb_read(stream, buf, 8);
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case PB_WT_32BIT:
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*size = 4;
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return pb_read(stream, buf, 4);
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default: PB_RETURN_ERROR(stream, "invalid wire_type");
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}
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}
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/* Decode string length from stream and return a substream with limited length.
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* Remember to close the substream using pb_close_string_substream().
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*/
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bool checkreturn pb_make_string_substream(pb_istream_t *stream, pb_istream_t *substream)
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{
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uint32_t size;
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if (!pb_decode_varint32(stream, &size))
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return false;
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*substream = *stream;
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if (substream->bytes_left < size)
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PB_RETURN_ERROR(stream, "parent stream too short");
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substream->bytes_left = size;
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stream->bytes_left -= size;
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return true;
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}
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void pb_close_string_substream(pb_istream_t *stream, pb_istream_t *substream)
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{
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stream->state = substream->state;
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#ifndef PB_NO_ERRMSG
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stream->errmsg = substream->errmsg;
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#endif
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}
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/*************************
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* Decode a single field *
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*************************/
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static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
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{
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pb_type_t type;
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pb_decoder_t func;
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type = iter->pos->type;
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func = PB_DECODERS[PB_LTYPE(type)];
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switch (PB_HTYPE(type))
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{
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case PB_HTYPE_REQUIRED:
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return func(stream, iter->pos, iter->pData);
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case PB_HTYPE_OPTIONAL:
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*(bool*)iter->pSize = true;
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return func(stream, iter->pos, iter->pData);
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case PB_HTYPE_REPEATED:
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if (wire_type == PB_WT_STRING
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&& PB_LTYPE(type) <= PB_LTYPE_LAST_PACKABLE)
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{
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/* Packed array */
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bool status = true;
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pb_size_t *size = (pb_size_t*)iter->pSize;
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pb_istream_t substream;
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if (!pb_make_string_substream(stream, &substream))
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return false;
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while (substream.bytes_left > 0 && *size < iter->pos->array_size)
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{
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void *pItem = (char*)iter->pData + iter->pos->data_size * (*size);
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if (!func(&substream, iter->pos, pItem))
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{
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status = false;
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break;
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}
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(*size)++;
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}
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pb_close_string_substream(stream, &substream);
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if (substream.bytes_left != 0)
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PB_RETURN_ERROR(stream, "array overflow");
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return status;
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}
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else
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{
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/* Repeated field */
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pb_size_t *size = (pb_size_t*)iter->pSize;
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void *pItem = (char*)iter->pData + iter->pos->data_size * (*size);
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if (*size >= iter->pos->array_size)
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PB_RETURN_ERROR(stream, "array overflow");
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(*size)++;
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return func(stream, iter->pos, pItem);
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}
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case PB_HTYPE_ONEOF:
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*(pb_size_t*)iter->pSize = iter->pos->tag;
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if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
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{
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/* We memset to zero so that any callbacks are set to NULL.
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* Then set any default values. */
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memset(iter->pData, 0, iter->pos->data_size);
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pb_message_set_to_defaults((const pb_field_t*)iter->pos->ptr, iter->pData);
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}
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return func(stream, iter->pos, iter->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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#ifdef PB_ENABLE_MALLOC
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/* Allocate storage for the field and store the pointer at iter->pData.
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* array_size is the number of entries to reserve in an array.
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* Zero size is not allowed, use pb_free() for releasing.
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*/
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static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size)
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{
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void *ptr = *(void**)pData;
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if (data_size == 0 || array_size == 0)
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PB_RETURN_ERROR(stream, "invalid size");
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/* Check for multiplication overflows.
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* This code avoids the costly division if the sizes are small enough.
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* Multiplication is safe as long as only half of bits are set
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* in either multiplicand.
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*/
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{
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const size_t check_limit = (size_t)1 << (sizeof(size_t) * 4);
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if (data_size >= check_limit || array_size >= check_limit)
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{
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const size_t size_max = (size_t)-1;
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if (size_max / array_size < data_size)
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{
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PB_RETURN_ERROR(stream, "size too large");
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}
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}
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}
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/* Allocate new or expand previous allocation */
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/* Note: on failure the old pointer will remain in the structure,
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* the message must be freed by caller also on error return. */
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ptr = pb_realloc(ptr, array_size * data_size);
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if (ptr == NULL)
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PB_RETURN_ERROR(stream, "realloc failed");
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*(void**)pData = ptr;
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return true;
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}
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/* Clear a newly allocated item in case it contains a pointer, or is a submessage. */
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static void initialize_pointer_field(void *pItem, pb_field_iter_t *iter)
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{
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if (PB_LTYPE(iter->pos->type) == PB_LTYPE_STRING ||
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PB_LTYPE(iter->pos->type) == PB_LTYPE_BYTES)
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{
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*(void**)pItem = NULL;
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}
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else if (PB_LTYPE(iter->pos->type) == PB_LTYPE_SUBMESSAGE)
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{
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pb_message_set_to_defaults((const pb_field_t *) iter->pos->ptr, pItem);
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}
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}
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#endif
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static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
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{
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#ifndef PB_ENABLE_MALLOC
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PB_UNUSED(wire_type);
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PB_UNUSED(iter);
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PB_RETURN_ERROR(stream, "no malloc support");
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#else
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pb_type_t type;
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pb_decoder_t func;
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type = iter->pos->type;
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func = PB_DECODERS[PB_LTYPE(type)];
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switch (PB_HTYPE(type))
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{
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case PB_HTYPE_REQUIRED:
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case PB_HTYPE_OPTIONAL:
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case PB_HTYPE_ONEOF:
|
|
if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE &&
|
|
*(void**)iter->pData != NULL)
|
|
{
|
|
/* Duplicate field, have to release the old allocation first. */
|
|
pb_release_single_field(iter);
|
|
}
|
|
|
|
if (PB_HTYPE(type) == PB_HTYPE_ONEOF)
|
|
{
|
|
*(pb_size_t*)iter->pSize = iter->pos->tag;
|
|
}
|
|
|
|
if (PB_LTYPE(type) == PB_LTYPE_STRING ||
|
|
PB_LTYPE(type) == PB_LTYPE_BYTES)
|
|
{
|
|
return func(stream, iter->pos, iter->pData);
|
|
}
|
|
else
|
|
{
|
|
if (!allocate_field(stream, iter->pData, iter->pos->data_size, 1))
|
|
return false;
|
|
|
|
initialize_pointer_field(*(void**)iter->pData, iter);
|
|
return func(stream, iter->pos, *(void**)iter->pData);
|
|
}
|
|
|
|
case PB_HTYPE_REPEATED:
|
|
if (wire_type == PB_WT_STRING
|
|
&& PB_LTYPE(type) <= PB_LTYPE_LAST_PACKABLE)
|
|
{
|
|
/* Packed array, multiple items come in at once. */
|
|
bool status = true;
|
|
pb_size_t *size = (pb_size_t*)iter->pSize;
|
|
size_t allocated_size = *size;
|
|
void *pItem;
|
|
pb_istream_t substream;
|
|
|
|
if (!pb_make_string_substream(stream, &substream))
|
|
return false;
|
|
|
|
while (substream.bytes_left)
|
|
{
|
|
if ((size_t)*size + 1 > allocated_size)
|
|
{
|
|
/* Allocate more storage. This tries to guess the
|
|
* number of remaining entries. Round the division
|
|
* upwards. */
|
|
allocated_size += (substream.bytes_left - 1) / iter->pos->data_size + 1;
|
|
|
|
if (!allocate_field(&substream, iter->pData, iter->pos->data_size, allocated_size))
|
|
{
|
|
status = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Decode the array entry */
|
|
pItem = *(char**)iter->pData + iter->pos->data_size * (*size);
|
|
initialize_pointer_field(pItem, iter);
|
|
if (!func(&substream, iter->pos, pItem))
|
|
{
|
|
status = false;
|
|
break;
|
|
}
|
|
|
|
if (*size == PB_SIZE_MAX)
|
|
{
|
|
#ifndef PB_NO_ERRMSG
|
|
stream->errmsg = "too many array entries";
|
|
#endif
|
|
status = false;
|
|
break;
|
|
}
|
|
|
|
(*size)++;
|
|
}
|
|
pb_close_string_substream(stream, &substream);
|
|
|
|
return status;
|
|
}
|
|
else
|
|
{
|
|
/* Normal repeated field, i.e. only one item at a time. */
|
|
pb_size_t *size = (pb_size_t*)iter->pSize;
|
|
void *pItem;
|
|
|
|
if (*size == PB_SIZE_MAX)
|
|
PB_RETURN_ERROR(stream, "too many array entries");
|
|
|
|
(*size)++;
|
|
if (!allocate_field(stream, iter->pData, iter->pos->data_size, *size))
|
|
return false;
|
|
|
|
pItem = *(char**)iter->pData + iter->pos->data_size * (*size - 1);
|
|
initialize_pointer_field(pItem, iter);
|
|
return func(stream, iter->pos, pItem);
|
|
}
|
|
|
|
default:
|
|
PB_RETURN_ERROR(stream, "invalid field type");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
|
|
{
|
|
pb_callback_t *pCallback = (pb_callback_t*)iter->pData;
|
|
|
|
#ifdef PB_OLD_CALLBACK_STYLE
|
|
void *arg = pCallback->arg;
|
|
#else
|
|
void **arg = &(pCallback->arg);
|
|
#endif
|
|
|
|
if (pCallback->funcs.decode == NULL)
|
|
return pb_skip_field(stream, wire_type);
|
|
|
|
if (wire_type == PB_WT_STRING)
|
|
{
|
|
pb_istream_t substream;
|
|
|
|
if (!pb_make_string_substream(stream, &substream))
|
|
return false;
|
|
|
|
do
|
|
{
|
|
if (!pCallback->funcs.decode(&substream, iter->pos, arg))
|
|
PB_RETURN_ERROR(stream, "callback failed");
|
|
} while (substream.bytes_left);
|
|
|
|
pb_close_string_substream(stream, &substream);
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
/* Copy the single scalar value to stack.
|
|
* This is required so that we can limit the stream length,
|
|
* which in turn allows to use same callback for packed and
|
|
* not-packed fields. */
|
|
pb_istream_t substream;
|
|
pb_byte_t buffer[10];
|
|
size_t size = sizeof(buffer);
|
|
|
|
if (!read_raw_value(stream, wire_type, buffer, &size))
|
|
return false;
|
|
substream = pb_istream_from_buffer(buffer, size);
|
|
|
|
return pCallback->funcs.decode(&substream, iter->pos, arg);
|
|
}
|
|
}
|
|
|
|
static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
|
|
{
|
|
#ifdef PB_ENABLE_MALLOC
|
|
/* When decoding an oneof field, check if there is old data that must be
|
|
* released first. */
|
|
if (PB_HTYPE(iter->pos->type) == PB_HTYPE_ONEOF)
|
|
{
|
|
if (!pb_release_union_field(stream, iter))
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
switch (PB_ATYPE(iter->pos->type))
|
|
{
|
|
case PB_ATYPE_STATIC:
|
|
return decode_static_field(stream, wire_type, iter);
|
|
|
|
case PB_ATYPE_POINTER:
|
|
return decode_pointer_field(stream, wire_type, iter);
|
|
|
|
case PB_ATYPE_CALLBACK:
|
|
return decode_callback_field(stream, wire_type, iter);
|
|
|
|
default:
|
|
PB_RETURN_ERROR(stream, "invalid field type");
|
|
}
|
|
}
|
|
|
|
static void iter_from_extension(pb_field_iter_t *iter, pb_extension_t *extension)
|
|
{
|
|
/* Fake a field iterator for the extension field.
|
|
* It is not actually safe to advance this iterator, but decode_field
|
|
* will not even try to. */
|
|
const pb_field_t *field = (const pb_field_t*)extension->type->arg;
|
|
(void)pb_field_iter_begin(iter, field, extension->dest);
|
|
iter->pData = extension->dest;
|
|
iter->pSize = &extension->found;
|
|
|
|
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. */
|
|
iter->pData = &extension->dest;
|
|
}
|
|
}
|
|
|
|
/* Default handler for extension fields. Expects a pb_field_t structure
|
|
* in extension->type->arg. */
|
|
static bool checkreturn default_extension_decoder(pb_istream_t *stream,
|
|
pb_extension_t *extension, uint32_t tag, pb_wire_type_t wire_type)
|
|
{
|
|
const pb_field_t *field = (const pb_field_t*)extension->type->arg;
|
|
pb_field_iter_t iter;
|
|
|
|
if (field->tag != tag)
|
|
return true;
|
|
|
|
iter_from_extension(&iter, extension);
|
|
extension->found = true;
|
|
return decode_field(stream, wire_type, &iter);
|
|
}
|
|
|
|
/* Try to decode an unknown field as an extension field. Tries each extension
|
|
* decoder in turn, until one of them handles the field or loop ends. */
|
|
static bool checkreturn decode_extension(pb_istream_t *stream,
|
|
uint32_t tag, pb_wire_type_t wire_type, pb_field_iter_t *iter)
|
|
{
|
|
pb_extension_t *extension = *(pb_extension_t* const *)iter->pData;
|
|
size_t pos = stream->bytes_left;
|
|
|
|
while (extension != NULL && pos == stream->bytes_left)
|
|
{
|
|
bool status;
|
|
if (extension->type->decode)
|
|
status = extension->type->decode(stream, extension, tag, wire_type);
|
|
else
|
|
status = default_extension_decoder(stream, extension, tag, wire_type);
|
|
|
|
if (!status)
|
|
return false;
|
|
|
|
extension = extension->next;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Step through the iterator until an extension field is found or until all
|
|
* entries have been checked. There can be only one extension field per
|
|
* message. Returns false if no extension field is found. */
|
|
static bool checkreturn find_extension_field(pb_field_iter_t *iter)
|
|
{
|
|
const pb_field_t *start = iter->pos;
|
|
|
|
do {
|
|
if (PB_LTYPE(iter->pos->type) == PB_LTYPE_EXTENSION)
|
|
return true;
|
|
(void)pb_field_iter_next(iter);
|
|
} while (iter->pos != start);
|
|
|
|
return false;
|
|
}
|
|
|
|
/* Initialize message fields to default values, recursively */
|
|
static void pb_field_set_to_default(pb_field_iter_t *iter)
|
|
{
|
|
pb_type_t type;
|
|
type = iter->pos->type;
|
|
|
|
if (PB_LTYPE(type) == PB_LTYPE_EXTENSION)
|
|
{
|
|
pb_extension_t *ext = *(pb_extension_t* const *)iter->pData;
|
|
while (ext != NULL)
|
|
{
|
|
pb_field_iter_t ext_iter;
|
|
ext->found = false;
|
|
iter_from_extension(&ext_iter, ext);
|
|
pb_field_set_to_default(&ext_iter);
|
|
ext = ext->next;
|
|
}
|
|
}
|
|
else if (PB_ATYPE(type) == PB_ATYPE_STATIC)
|
|
{
|
|
bool init_data = true;
|
|
if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL)
|
|
{
|
|
/* Set has_field to false. Still initialize the optional field
|
|
* itself also. */
|
|
*(bool*)iter->pSize = false;
|
|
}
|
|
else if (PB_HTYPE(type) == PB_HTYPE_REPEATED ||
|
|
PB_HTYPE(type) == PB_HTYPE_ONEOF)
|
|
{
|
|
/* REPEATED: Set array count to 0, no need to initialize contents.
|
|
ONEOF: Set which_field to 0. */
|
|
*(pb_size_t*)iter->pSize = 0;
|
|
init_data = false;
|
|
}
|
|
|
|
if (init_data)
|
|
{
|
|
if (PB_LTYPE(iter->pos->type) == PB_LTYPE_SUBMESSAGE)
|
|
{
|
|
/* Initialize submessage to defaults */
|
|
pb_message_set_to_defaults((const pb_field_t *) iter->pos->ptr, iter->pData);
|
|
}
|
|
else if (iter->pos->ptr != NULL)
|
|
{
|
|
/* Initialize to default value */
|
|
memcpy(iter->pData, iter->pos->ptr, iter->pos->data_size);
|
|
}
|
|
else
|
|
{
|
|
/* Initialize to zeros */
|
|
memset(iter->pData, 0, iter->pos->data_size);
|
|
}
|
|
}
|
|
}
|
|
else if (PB_ATYPE(type) == PB_ATYPE_POINTER)
|
|
{
|
|
/* Initialize the pointer to NULL. */
|
|
*(void**)iter->pData = NULL;
|
|
|
|
/* Initialize array count to 0. */
|
|
if (PB_HTYPE(type) == PB_HTYPE_REPEATED ||
|
|
PB_HTYPE(type) == PB_HTYPE_ONEOF)
|
|
{
|
|
*(pb_size_t*)iter->pSize = 0;
|
|
}
|
|
}
|
|
else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK)
|
|
{
|
|
/* Don't overwrite callback */
|
|
}
|
|
}
|
|
|
|
static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct)
|
|
{
|
|
pb_field_iter_t iter;
|
|
|
|
if (!pb_field_iter_begin(&iter, fields, dest_struct))
|
|
return; /* Empty message type */
|
|
|
|
do
|
|
{
|
|
pb_field_set_to_default(&iter);
|
|
} while (pb_field_iter_next(&iter));
|
|
}
|
|
|
|
/*********************
|
|
* Decode all fields *
|
|
*********************/
|
|
|
|
bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
|
|
{
|
|
uint32_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 31) / 32] = {0, 0};
|
|
const uint32_t allbits = ~(uint32_t)0;
|
|
uint32_t extension_range_start = 0;
|
|
pb_field_iter_t iter;
|
|
|
|
/* Return value ignored, as empty message types will be correctly handled by
|
|
* pb_field_iter_find() anyway. */
|
|
(void)pb_field_iter_begin(&iter, fields, dest_struct);
|
|
|
|
while (stream->bytes_left)
|
|
{
|
|
uint32_t tag;
|
|
pb_wire_type_t wire_type;
|
|
bool eof;
|
|
|
|
if (!pb_decode_tag(stream, &wire_type, &tag, &eof))
|
|
{
|
|
if (eof)
|
|
break;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
if (!pb_field_iter_find(&iter, tag))
|
|
{
|
|
/* No match found, check if it matches an extension. */
|
|
if (tag >= extension_range_start)
|
|
{
|
|
if (!find_extension_field(&iter))
|
|
extension_range_start = (uint32_t)-1;
|
|
else
|
|
extension_range_start = iter.pos->tag;
|
|
|
|
if (tag >= extension_range_start)
|
|
{
|
|
size_t pos = stream->bytes_left;
|
|
|
|
if (!decode_extension(stream, tag, wire_type, &iter))
|
|
return false;
|
|
|
|
if (pos != stream->bytes_left)
|
|
{
|
|
/* The field was handled */
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* No match found, skip data */
|
|
if (!pb_skip_field(stream, wire_type))
|
|
return false;
|
|
continue;
|
|
}
|
|
|
|
if (PB_HTYPE(iter.pos->type) == PB_HTYPE_REQUIRED
|
|
&& iter.required_field_index < PB_MAX_REQUIRED_FIELDS)
|
|
{
|
|
uint32_t tmp = ((uint32_t)1 << (iter.required_field_index & 31));
|
|
fields_seen[iter.required_field_index >> 5] |= tmp;
|
|
}
|
|
|
|
if (!decode_field(stream, wire_type, &iter))
|
|
return false;
|
|
}
|
|
|
|
/* Check that all required fields were present. */
|
|
{
|
|
/* First figure out the number of required fields by
|
|
* seeking to the end of the field array. Usually we
|
|
* are already close to end after decoding.
|
|
*/
|
|
unsigned req_field_count;
|
|
pb_type_t last_type;
|
|
unsigned i;
|
|
do {
|
|
req_field_count = iter.required_field_index;
|
|
last_type = iter.pos->type;
|
|
} while (pb_field_iter_next(&iter));
|
|
|
|
/* Fixup if last field was also required. */
|
|
if (PB_HTYPE(last_type) == PB_HTYPE_REQUIRED && iter.pos->tag != 0)
|
|
req_field_count++;
|
|
|
|
if (req_field_count > 0)
|
|
{
|
|
/* Check the whole words */
|
|
for (i = 0; i < (req_field_count >> 5); i++)
|
|
{
|
|
if (fields_seen[i] != allbits)
|
|
PB_RETURN_ERROR(stream, "missing required field");
|
|
}
|
|
|
|
/* Check the remaining bits */
|
|
if (fields_seen[req_field_count >> 5] != (allbits >> (32 - (req_field_count & 31))))
|
|
PB_RETURN_ERROR(stream, "missing required field");
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
|
|
{
|
|
bool status;
|
|
pb_message_set_to_defaults(fields, dest_struct);
|
|
status = pb_decode_noinit(stream, fields, dest_struct);
|
|
|
|
#ifdef PB_ENABLE_MALLOC
|
|
if (!status)
|
|
pb_release(fields, dest_struct);
|
|
#endif
|
|
|
|
return status;
|
|
}
|
|
|
|
bool pb_decode_delimited(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
|
|
{
|
|
pb_istream_t substream;
|
|
bool status;
|
|
|
|
if (!pb_make_string_substream(stream, &substream))
|
|
return false;
|
|
|
|
status = pb_decode(&substream, fields, dest_struct);
|
|
pb_close_string_substream(stream, &substream);
|
|
return status;
|
|
}
|
|
|
|
#ifdef PB_ENABLE_MALLOC
|
|
/* Given an oneof field, if there has already been a field inside this oneof,
|
|
* release it before overwriting with a different one. */
|
|
static bool pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter)
|
|
{
|
|
pb_size_t old_tag = *(pb_size_t*)iter->pSize; /* Previous which_ value */
|
|
pb_size_t new_tag = iter->pos->tag; /* New which_ value */
|
|
|
|
if (old_tag == 0)
|
|
return true; /* Ok, no old data in union */
|
|
|
|
if (old_tag == new_tag)
|
|
return true; /* Ok, old data is of same type => merge */
|
|
|
|
/* Release old data. The find can fail if the message struct contains
|
|
* invalid data. */
|
|
if (!pb_field_iter_find(iter, old_tag))
|
|
PB_RETURN_ERROR(stream, "invalid union tag");
|
|
|
|
pb_release_single_field(iter);
|
|
|
|
/* Restore iterator to where it should be.
|
|
* This shouldn't fail unless the pb_field_t structure is corrupted. */
|
|
if (!pb_field_iter_find(iter, new_tag))
|
|
PB_RETURN_ERROR(stream, "iterator error");
|
|
|
|
return true;
|
|
}
|
|
|
|
static void pb_release_single_field(const pb_field_iter_t *iter)
|
|
{
|
|
pb_type_t type;
|
|
type = iter->pos->type;
|
|
|
|
if (PB_HTYPE(type) == PB_HTYPE_ONEOF)
|
|
{
|
|
if (*(pb_size_t*)iter->pSize != iter->pos->tag)
|
|
return; /* This is not the current field in the union */
|
|
}
|
|
|
|
/* Release anything contained inside an extension or submsg.
|
|
* This has to be done even if the submsg itself is statically
|
|
* allocated. */
|
|
if (PB_LTYPE(type) == PB_LTYPE_EXTENSION)
|
|
{
|
|
/* Release fields from all extensions in the linked list */
|
|
pb_extension_t *ext = *(pb_extension_t**)iter->pData;
|
|
while (ext != NULL)
|
|
{
|
|
pb_field_iter_t ext_iter;
|
|
iter_from_extension(&ext_iter, ext);
|
|
pb_release_single_field(&ext_iter);
|
|
ext = ext->next;
|
|
}
|
|
}
|
|
else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
|
|
{
|
|
/* Release fields in submessage or submsg array */
|
|
void *pItem = iter->pData;
|
|
pb_size_t count = 1;
|
|
|
|
if (PB_ATYPE(type) == PB_ATYPE_POINTER)
|
|
{
|
|
pItem = *(void**)iter->pData;
|
|
}
|
|
|
|
if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
|
|
{
|
|
count = *(pb_size_t*)iter->pSize;
|
|
|
|
if (PB_ATYPE(type) == PB_ATYPE_STATIC && count > iter->pos->array_size)
|
|
{
|
|
/* Protect against corrupted _count fields */
|
|
count = iter->pos->array_size;
|
|
}
|
|
}
|
|
|
|
if (pItem)
|
|
{
|
|
while (count--)
|
|
{
|
|
pb_release((const pb_field_t*)iter->pos->ptr, pItem);
|
|
pItem = (char*)pItem + iter->pos->data_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (PB_ATYPE(type) == PB_ATYPE_POINTER)
|
|
{
|
|
if (PB_HTYPE(type) == PB_HTYPE_REPEATED &&
|
|
(PB_LTYPE(type) == PB_LTYPE_STRING ||
|
|
PB_LTYPE(type) == PB_LTYPE_BYTES))
|
|
{
|
|
/* Release entries in repeated string or bytes array */
|
|
void **pItem = *(void***)iter->pData;
|
|
pb_size_t count = *(pb_size_t*)iter->pSize;
|
|
while (count--)
|
|
{
|
|
pb_free(*pItem);
|
|
*pItem++ = NULL;
|
|
}
|
|
}
|
|
|
|
if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
|
|
{
|
|
/* We are going to release the array, so set the size to 0 */
|
|
*(pb_size_t*)iter->pSize = 0;
|
|
}
|
|
|
|
/* Release main item */
|
|
pb_free(*(void**)iter->pData);
|
|
*(void**)iter->pData = NULL;
|
|
}
|
|
}
|
|
|
|
void pb_release(const pb_field_t fields[], void *dest_struct)
|
|
{
|
|
pb_field_iter_t iter;
|
|
|
|
if (!dest_struct)
|
|
return; /* Ignore NULL pointers, similar to free() */
|
|
|
|
if (!pb_field_iter_begin(&iter, fields, dest_struct))
|
|
return; /* Empty message type */
|
|
|
|
do
|
|
{
|
|
pb_release_single_field(&iter);
|
|
} while (pb_field_iter_next(&iter));
|
|
}
|
|
#endif
|
|
|
|
/* Field decoders */
|
|
|
|
bool pb_decode_svarint(pb_istream_t *stream, int64_t *dest)
|
|
{
|
|
uint64_t value;
|
|
if (!pb_decode_varint(stream, &value))
|
|
return false;
|
|
|
|
if (value & 1)
|
|
*dest = (int64_t)(~(value >> 1));
|
|
else
|
|
*dest = (int64_t)(value >> 1);
|
|
|
|
return true;
|
|
}
|
|
|
|
bool pb_decode_fixed32(pb_istream_t *stream, void *dest)
|
|
{
|
|
pb_byte_t bytes[4];
|
|
|
|
if (!pb_read(stream, bytes, 4))
|
|
return false;
|
|
|
|
*(uint32_t*)dest = ((uint32_t)bytes[0] << 0) |
|
|
((uint32_t)bytes[1] << 8) |
|
|
((uint32_t)bytes[2] << 16) |
|
|
((uint32_t)bytes[3] << 24);
|
|
return true;
|
|
}
|
|
|
|
bool pb_decode_fixed64(pb_istream_t *stream, void *dest)
|
|
{
|
|
pb_byte_t bytes[8];
|
|
|
|
if (!pb_read(stream, bytes, 8))
|
|
return false;
|
|
|
|
*(uint64_t*)dest = ((uint64_t)bytes[0] << 0) |
|
|
((uint64_t)bytes[1] << 8) |
|
|
((uint64_t)bytes[2] << 16) |
|
|
((uint64_t)bytes[3] << 24) |
|
|
((uint64_t)bytes[4] << 32) |
|
|
((uint64_t)bytes[5] << 40) |
|
|
((uint64_t)bytes[6] << 48) |
|
|
((uint64_t)bytes[7] << 56);
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
uint64_t value;
|
|
int64_t svalue;
|
|
int64_t clamped;
|
|
if (!pb_decode_varint(stream, &value))
|
|
return false;
|
|
|
|
/* See issue 97: Google's C++ protobuf allows negative varint values to
|
|
* be cast as int32_t, instead of the int64_t that should be used when
|
|
* encoding. Previous nanopb versions had a bug in encoding. In order to
|
|
* not break decoding of such messages, we cast <=32 bit fields to
|
|
* int32_t first to get the sign correct.
|
|
*/
|
|
if (field->data_size == sizeof(int64_t))
|
|
svalue = (int64_t)value;
|
|
else
|
|
svalue = (int32_t)value;
|
|
|
|
/* Cast to the proper field size, while checking for overflows */
|
|
if (field->data_size == sizeof(int64_t))
|
|
clamped = *(int64_t*)dest = svalue;
|
|
else if (field->data_size == sizeof(int32_t))
|
|
clamped = *(int32_t*)dest = (int32_t)svalue;
|
|
else if (field->data_size == sizeof(int_least16_t))
|
|
clamped = *(int_least16_t*)dest = (int_least16_t)svalue;
|
|
else if (field->data_size == sizeof(int_least8_t))
|
|
clamped = *(int_least8_t*)dest = (int_least8_t)svalue;
|
|
else
|
|
PB_RETURN_ERROR(stream, "invalid data_size");
|
|
|
|
if (clamped != svalue)
|
|
PB_RETURN_ERROR(stream, "integer too large");
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
uint64_t value, clamped;
|
|
if (!pb_decode_varint(stream, &value))
|
|
return false;
|
|
|
|
/* Cast to the proper field size, while checking for overflows */
|
|
if (field->data_size == sizeof(uint64_t))
|
|
clamped = *(uint64_t*)dest = value;
|
|
else if (field->data_size == sizeof(uint32_t))
|
|
clamped = *(uint32_t*)dest = (uint32_t)value;
|
|
else if (field->data_size == sizeof(uint_least16_t))
|
|
clamped = *(uint_least16_t*)dest = (uint_least16_t)value;
|
|
else if (field->data_size == sizeof(uint_least8_t))
|
|
clamped = *(uint_least8_t*)dest = (uint_least8_t)value;
|
|
else
|
|
PB_RETURN_ERROR(stream, "invalid data_size");
|
|
|
|
if (clamped != value)
|
|
PB_RETURN_ERROR(stream, "integer too large");
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool checkreturn pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
int64_t value, clamped;
|
|
if (!pb_decode_svarint(stream, &value))
|
|
return false;
|
|
|
|
/* Cast to the proper field size, while checking for overflows */
|
|
if (field->data_size == sizeof(int64_t))
|
|
clamped = *(int64_t*)dest = value;
|
|
else if (field->data_size == sizeof(int32_t))
|
|
clamped = *(int32_t*)dest = (int32_t)value;
|
|
else if (field->data_size == sizeof(int_least16_t))
|
|
clamped = *(int_least16_t*)dest = (int_least16_t)value;
|
|
else if (field->data_size == sizeof(int_least8_t))
|
|
clamped = *(int_least8_t*)dest = (int_least8_t)value;
|
|
else
|
|
PB_RETURN_ERROR(stream, "invalid data_size");
|
|
|
|
if (clamped != value)
|
|
PB_RETURN_ERROR(stream, "integer too large");
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
PB_UNUSED(field);
|
|
return pb_decode_fixed32(stream, dest);
|
|
}
|
|
|
|
static bool checkreturn pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
PB_UNUSED(field);
|
|
return pb_decode_fixed64(stream, dest);
|
|
}
|
|
|
|
static bool checkreturn pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
uint32_t size;
|
|
size_t alloc_size;
|
|
pb_bytes_array_t *bdest;
|
|
|
|
if (!pb_decode_varint32(stream, &size))
|
|
return false;
|
|
|
|
if (size > PB_SIZE_MAX)
|
|
PB_RETURN_ERROR(stream, "bytes overflow");
|
|
|
|
alloc_size = PB_BYTES_ARRAY_T_ALLOCSIZE(size);
|
|
if (size > alloc_size)
|
|
PB_RETURN_ERROR(stream, "size too large");
|
|
|
|
if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
|
|
{
|
|
#ifndef PB_ENABLE_MALLOC
|
|
PB_RETURN_ERROR(stream, "no malloc support");
|
|
#else
|
|
if (!allocate_field(stream, dest, alloc_size, 1))
|
|
return false;
|
|
bdest = *(pb_bytes_array_t**)dest;
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
if (PB_LTYPE(field->type) == PB_LTYPE_FIXED_LENGTH_BYTES) {
|
|
if (size != field->data_size)
|
|
PB_RETURN_ERROR(stream, "incorrect inline bytes size");
|
|
return pb_read(stream, (pb_byte_t*)dest, field->data_size);
|
|
}
|
|
|
|
if (alloc_size > field->data_size)
|
|
PB_RETURN_ERROR(stream, "bytes overflow");
|
|
bdest = (pb_bytes_array_t*)dest;
|
|
}
|
|
|
|
bdest->size = (pb_size_t)size;
|
|
return pb_read(stream, bdest->bytes, size);
|
|
}
|
|
|
|
static bool checkreturn pb_dec_string(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
uint32_t size;
|
|
size_t alloc_size;
|
|
bool status;
|
|
if (!pb_decode_varint32(stream, &size))
|
|
return false;
|
|
|
|
/* Space for null terminator */
|
|
alloc_size = size + 1;
|
|
|
|
if (alloc_size < size)
|
|
PB_RETURN_ERROR(stream, "size too large");
|
|
|
|
if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
|
|
{
|
|
#ifndef PB_ENABLE_MALLOC
|
|
PB_RETURN_ERROR(stream, "no malloc support");
|
|
#else
|
|
if (!allocate_field(stream, dest, alloc_size, 1))
|
|
return false;
|
|
dest = *(void**)dest;
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
if (alloc_size > field->data_size)
|
|
PB_RETURN_ERROR(stream, "string overflow");
|
|
}
|
|
|
|
status = pb_read(stream, (pb_byte_t*)dest, size);
|
|
*((pb_byte_t*)dest + size) = 0;
|
|
return status;
|
|
}
|
|
|
|
static bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field, void *dest)
|
|
{
|
|
bool status;
|
|
pb_istream_t substream;
|
|
const pb_field_t* submsg_fields = (const pb_field_t*)field->ptr;
|
|
|
|
if (!pb_make_string_substream(stream, &substream))
|
|
return false;
|
|
|
|
if (field->ptr == NULL)
|
|
PB_RETURN_ERROR(stream, "invalid field descriptor");
|
|
|
|
/* New array entries need to be initialized, while required and optional
|
|
* submessages have already been initialized in the top-level pb_decode. */
|
|
if (PB_HTYPE(field->type) == PB_HTYPE_REPEATED)
|
|
status = pb_decode(&substream, submsg_fields, dest);
|
|
else
|
|
status = pb_decode_noinit(&substream, submsg_fields, dest);
|
|
|
|
pb_close_string_substream(stream, &substream);
|
|
return status;
|
|
}
|