/* pb_decode.c -- decode a protobuf using minimal resources * * 2011 Petteri Aimonen */ /* Use the GCC warn_unused_result attribute to check that all return values * are propagated correctly. On other compilers and gcc before 3.4.0 just * ignore the annotation. */ #if !defined(__GNUC__) || ( __GNUC__ < 3) || (__GNUC__ == 3 && __GNUC_MINOR__ < 4) #define checkreturn #else #define checkreturn __attribute__((warn_unused_result)) #endif #include "pb.h" #include "pb_decode.h" /************************************** * Declarations internal to this file * **************************************/ /* Iterator for pb_field_t list */ typedef struct { const pb_field_t *start; /* Start of the pb_field_t array */ const pb_field_t *pos; /* Current position of the iterator */ unsigned field_index; /* Zero-based index of the field. */ unsigned required_field_index; /* Zero-based index that counts only the required fields */ void *dest_struct; /* Pointer to the destination structure to decode to */ void *pData; /* Pointer where to store current field value */ void *pSize; /* Pointer where to store the size of current array field */ } pb_field_iterator_t; typedef bool (*pb_decoder_t)(pb_istream_t *stream, const pb_field_t *field, void *dest) checkreturn; static bool checkreturn buf_read(pb_istream_t *stream, uint8_t *buf, size_t count); static bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest); static bool checkreturn read_raw_value(pb_istream_t *stream, pb_wire_type_t wire_type, uint8_t *buf, size_t *size); static void pb_field_init(pb_field_iterator_t *iter, const pb_field_t *fields, void *dest_struct); static bool pb_field_next(pb_field_iterator_t *iter); static bool checkreturn pb_field_find(pb_field_iterator_t *iter, uint32_t tag); static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter); static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter); static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter); static bool checkreturn default_extension_decoder(pb_istream_t *stream, pb_extension_t *extension, uint32_t tag, pb_wire_type_t wire_type); static bool checkreturn decode_extension(pb_istream_t *stream, uint32_t tag, pb_wire_type_t wire_type, pb_field_iterator_t *iter); static bool checkreturn find_extension_field(pb_field_iterator_t *iter); static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct); static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_string(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field, void *dest); static bool checkreturn pb_skip_varint(pb_istream_t *stream); static bool checkreturn pb_skip_string(pb_istream_t *stream); /* --- Function pointers to field decoders --- * Order in the array must match pb_action_t LTYPE numbering. */ static const pb_decoder_t PB_DECODERS[PB_LTYPES_COUNT] = { &pb_dec_varint, &pb_dec_uvarint, &pb_dec_svarint, &pb_dec_fixed32, &pb_dec_fixed64, &pb_dec_bytes, &pb_dec_string, &pb_dec_submessage, NULL /* extensions */ }; /******************************* * pb_istream_t implementation * *******************************/ static bool checkreturn buf_read(pb_istream_t *stream, uint8_t *buf, size_t count) { uint8_t *source = (uint8_t*)stream->state; stream->state = source + count; if (buf != NULL) { while (count--) *buf++ = *source++; } return true; } bool checkreturn pb_read(pb_istream_t *stream, uint8_t *buf, size_t count) { #ifndef PB_BUFFER_ONLY if (buf == NULL && stream->callback != buf_read) { /* Skip input bytes */ uint8_t tmp[16]; while (count > 16) { if (!pb_read(stream, tmp, 16)) return false; count -= 16; } return pb_read(stream, tmp, count); } #endif if (stream->bytes_left < count) PB_RETURN_ERROR(stream, "end-of-stream"); #ifndef PB_BUFFER_ONLY if (!stream->callback(stream, buf, count)) PB_RETURN_ERROR(stream, "io error"); #else if (!buf_read(stream, buf, count)) return false; #endif stream->bytes_left -= count; return true; } /* Read a single byte from input stream. buf may not be NULL. * This is an optimization for the varint decoding. */ static bool checkreturn pb_readbyte(pb_istream_t *stream, uint8_t *buf) { if (stream->bytes_left == 0) PB_RETURN_ERROR(stream, "end-of-stream"); #ifndef PB_BUFFER_ONLY if (!stream->callback(stream, buf, 1)) PB_RETURN_ERROR(stream, "io error"); #else *buf = *(uint8_t*)stream->state; stream->state = (uint8_t*)stream->state + 1; #endif stream->bytes_left--; return true; } pb_istream_t pb_istream_from_buffer(uint8_t *buf, size_t bufsize) { pb_istream_t stream; #ifdef PB_BUFFER_ONLY stream.callback = NULL; #else stream.callback = &buf_read; #endif stream.state = buf; stream.bytes_left = bufsize; #ifndef PB_NO_ERRMSG stream.errmsg = NULL; #endif return stream; } /******************** * Helper functions * ********************/ static bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest) { uint8_t byte; uint32_t result; if (!pb_readbyte(stream, &byte)) return false; if ((byte & 0x80) == 0) { /* Quick case, 1 byte value */ result = byte; } else { /* Multibyte case */ uint8_t bitpos = 7; result = byte & 0x7F; do { if (bitpos >= 32) PB_RETURN_ERROR(stream, "varint overflow"); if (!pb_readbyte(stream, &byte)) return false; result |= (uint32_t)(byte & 0x7F) << bitpos; bitpos = (uint8_t)(bitpos + 7); } while (byte & 0x80); } *dest = result; return true; } bool checkreturn pb_decode_varint(pb_istream_t *stream, uint64_t *dest) { uint8_t byte; uint8_t bitpos = 0; uint64_t result = 0; do { if (bitpos >= 64) PB_RETURN_ERROR(stream, "varint overflow"); if (!pb_readbyte(stream, &byte)) return false; result |= (uint64_t)(byte & 0x7F) << bitpos; bitpos = (uint8_t)(bitpos + 7); } while (byte & 0x80); *dest = result; return true; } bool checkreturn pb_skip_varint(pb_istream_t *stream) { uint8_t byte; do { if (!pb_read(stream, &byte, 1)) return false; } while (byte & 0x80); return true; } bool checkreturn pb_skip_string(pb_istream_t *stream) { uint32_t length; if (!pb_decode_varint32(stream, &length)) return false; return pb_read(stream, NULL, length); } bool checkreturn pb_decode_tag(pb_istream_t *stream, pb_wire_type_t *wire_type, uint32_t *tag, bool *eof) { uint32_t temp; *eof = false; *wire_type = (pb_wire_type_t) 0; *tag = 0; if (!pb_decode_varint32(stream, &temp)) { if (stream->bytes_left == 0) *eof = true; return false; } if (temp == 0) { *eof = true; /* Special feature: allow 0-terminated messages. */ return false; } *tag = temp >> 3; *wire_type = (pb_wire_type_t)(temp & 7); return true; } bool checkreturn pb_skip_field(pb_istream_t *stream, pb_wire_type_t wire_type) { switch (wire_type) { case PB_WT_VARINT: return pb_skip_varint(stream); case PB_WT_64BIT: return pb_read(stream, NULL, 8); case PB_WT_STRING: return pb_skip_string(stream); case PB_WT_32BIT: return pb_read(stream, NULL, 4); default: PB_RETURN_ERROR(stream, "invalid wire_type"); } } /* Read a raw value to buffer, for the purpose of passing it to callback as * a substream. Size is maximum size on call, and actual size on return. */ static bool checkreturn read_raw_value(pb_istream_t *stream, pb_wire_type_t wire_type, uint8_t *buf, size_t *size) { size_t max_size = *size; switch (wire_type) { case PB_WT_VARINT: *size = 0; do { (*size)++; if (*size > max_size) return false; if (!pb_read(stream, buf, 1)) return false; } while (*buf++ & 0x80); return true; case PB_WT_64BIT: *size = 8; return pb_read(stream, buf, 8); case PB_WT_32BIT: *size = 4; return pb_read(stream, buf, 4); default: PB_RETURN_ERROR(stream, "invalid wire_type"); } } /* Decode string length from stream and return a substream with limited length. * Remember to close the substream using pb_close_string_substream(). */ bool checkreturn pb_make_string_substream(pb_istream_t *stream, pb_istream_t *substream) { uint32_t size; if (!pb_decode_varint32(stream, &size)) return false; *substream = *stream; if (substream->bytes_left < size) PB_RETURN_ERROR(stream, "parent stream too short"); substream->bytes_left = size; stream->bytes_left -= size; return true; } void pb_close_string_substream(pb_istream_t *stream, pb_istream_t *substream) { stream->state = substream->state; #ifndef PB_NO_ERRMSG stream->errmsg = substream->errmsg; #endif } static void pb_field_init(pb_field_iterator_t *iter, const pb_field_t *fields, void *dest_struct) { iter->start = iter->pos = fields; iter->field_index = 0; iter->required_field_index = 0; iter->pData = (char*)dest_struct + iter->pos->data_offset; iter->pSize = (char*)iter->pData + iter->pos->size_offset; iter->dest_struct = dest_struct; } static bool pb_field_next(pb_field_iterator_t *iter) { bool notwrapped = true; size_t prev_size = iter->pos->data_size; if (PB_ATYPE(iter->pos->type) == PB_ATYPE_STATIC && PB_HTYPE(iter->pos->type) == PB_HTYPE_REPEATED) { prev_size *= iter->pos->array_size; } else if (PB_ATYPE(iter->pos->type) == PB_ATYPE_POINTER) { prev_size = sizeof(void*); } if (iter->pos->tag == 0) return false; /* Only happens with empty message types */ if (PB_HTYPE(iter->pos->type) == PB_HTYPE_REQUIRED) iter->required_field_index++; iter->pos++; iter->field_index++; if (iter->pos->tag == 0) { iter->pos = iter->start; iter->field_index = 0; iter->required_field_index = 0; iter->pData = iter->dest_struct; prev_size = 0; notwrapped = false; } iter->pData = (char*)iter->pData + prev_size + iter->pos->data_offset; iter->pSize = (char*)iter->pData + iter->pos->size_offset; return notwrapped; } static bool checkreturn pb_field_find(pb_field_iterator_t *iter, uint32_t tag) { unsigned start = iter->field_index; do { if (iter->pos->tag == tag && PB_LTYPE(iter->pos->type) != PB_LTYPE_EXTENSION) { return true; } (void)pb_field_next(iter); } while (iter->field_index != start); return false; } /************************* * Decode a single field * *************************/ static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter) { pb_type_t type; pb_decoder_t func; type = iter->pos->type; func = PB_DECODERS[PB_LTYPE(type)]; switch (PB_HTYPE(type)) { case PB_HTYPE_REQUIRED: return func(stream, iter->pos, iter->pData); case PB_HTYPE_OPTIONAL: *(bool*)iter->pSize = true; return func(stream, iter->pos, iter->pData); case PB_HTYPE_REPEATED: if (wire_type == PB_WT_STRING && PB_LTYPE(type) <= PB_LTYPE_LAST_PACKABLE) { /* Packed array */ bool status = true; size_t *size = (size_t*)iter->pSize; pb_istream_t substream; if (!pb_make_string_substream(stream, &substream)) return false; while (substream.bytes_left > 0 && *size < iter->pos->array_size) { void *pItem = (uint8_t*)iter->pData + iter->pos->data_size * (*size); if (!func(&substream, iter->pos, pItem)) { status = false; break; } (*size)++; } pb_close_string_substream(stream, &substream); if (substream.bytes_left != 0) PB_RETURN_ERROR(stream, "array overflow"); return status; } else { /* Repeated field */ size_t *size = (size_t*)iter->pSize; void *pItem = (uint8_t*)iter->pData + iter->pos->data_size * (*size); if (*size >= iter->pos->array_size) PB_RETURN_ERROR(stream, "array overflow"); (*size)++; return func(stream, iter->pos, pItem); } default: PB_RETURN_ERROR(stream, "invalid field type"); } } #ifdef PB_ENABLE_MALLOC /* Allocate storage for the field and store the pointer at iter->pData. * array_size is the number of entries to reserve in an array. */ static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size) { void *ptr = *(void**)pData; size_t size = array_size * data_size; /* Allocate new or expand previous allocation */ /* Note: on failure the old pointer will remain in the structure, * the message must be freed by caller also on error return. */ ptr = pb_realloc(ptr, size); if (ptr == NULL) PB_RETURN_ERROR(stream, "realloc failed"); *(void**)pData = ptr; return true; } /* Clear a newly allocated item in case it contains a pointer, or is a submessage. */ static void initialize_pointer_field(void *pItem, pb_field_iterator_t *iter) { if (PB_LTYPE(iter->pos->type) == PB_LTYPE_STRING || PB_LTYPE(iter->pos->type) == PB_LTYPE_BYTES) { *(void**)pItem = NULL; } else if (PB_LTYPE(iter->pos->type) == PB_LTYPE_SUBMESSAGE) { pb_message_set_to_defaults((const pb_field_t *) iter->pos->ptr, pItem); } } #endif static bool checkreturn decode_pointer_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iterator_t *iter) { #ifndef PB_ENABLE_MALLOC UNUSED(wire_type); UNUSED(iter); PB_RETURN_ERROR(stream, "no malloc support"); #else pb_type_t type; pb_decoder_t func; type = iter->pos->type; func = PB_DECODERS[PB_LTYPE(type)]; switch (PB_HTYPE(type)) { case PB_HTYPE_REQUIRED: case PB_HTYPE_OPTIONAL: 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; size_t *size = (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 + 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 = *(uint8_t**)iter->pData + iter->pos->data_size * (*size); initialize_pointer_field(pItem, iter); if (!func(&substream, iter->pos, pItem)) { status = false; break; } (*size)++; } pb_close_string_substream(stream, &substream); return status; } else { /* Normal repeated field, i.e. only one item at a time. */ size_t *size = (size_t*)iter->pSize; void *pItem; (*size)++; if (!allocate_field(stream, iter->pData, iter->pos->data_size, *size)) return false; pItem = *(uint8_t**)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_iterator_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; uint8_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_iterator_t *iter) { 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"); } } /* 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_iterator_t iter; if (field->tag != tag) return true; iter.start = field; iter.pos = field; iter.field_index = 0; iter.required_field_index = 0; iter.dest_struct = extension->dest; iter.pData = extension->dest; iter.pSize = &extension->found; 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_iterator_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_iterator_t *iter) { unsigned start = iter->field_index; do { if (PB_LTYPE(iter->pos->type) == PB_LTYPE_EXTENSION) return true; (void)pb_field_next(iter); } while (iter->field_index != start); return false; } /* Initialize message fields to default values, recursively */ static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct) { pb_field_iterator_t iter; pb_field_init(&iter, fields, dest_struct); do { pb_type_t type; type = iter.pos->type; /* Avoid crash on empty message types (zero fields) */ if (iter.pos->tag == 0) continue; if (PB_ATYPE(type) == PB_ATYPE_STATIC) { 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) { /* Set array count to 0, no need to initialize contents. */ *(size_t*)iter.pSize = 0; continue; } 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) { *(size_t*)iter.pSize = 0; } } else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK) { /* Don't overwrite callback */ } } while (pb_field_next(&iter)); } /********************* * Decode all fields * *********************/ bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct) { uint8_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 7) / 8] = {0, 0, 0, 0, 0, 0, 0, 0}; uint32_t extension_range_start = 0; pb_field_iterator_t iter; pb_field_init(&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_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) { fields_seen[iter.required_field_index >> 3] |= (uint8_t)(1 << (iter.required_field_index & 7)); } 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_next(&iter)); /* Fixup if last field was also required. */ if (PB_HTYPE(last_type) == PB_HTYPE_REQUIRED && iter.pos->tag != 0) req_field_count++; /* Check the whole bytes */ for (i = 0; i < (req_field_count >> 3); i++) { if (fields_seen[i] != 0xFF) PB_RETURN_ERROR(stream, "missing required field"); } /* Check the remaining bits */ if (fields_seen[req_field_count >> 3] != (0xFF >> (8 - (req_field_count & 7)))) 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 void pb_release(const pb_field_t fields[], void *dest_struct) { pb_field_iterator_t iter; pb_field_init(&iter, fields, dest_struct); do { pb_type_t type; type = iter.pos->type; /* Avoid crash on empty message types (zero fields) */ if (iter.pos->tag == 0) continue; 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; size_t count = *(size_t*)iter.pSize; while (count--) { pb_free(*pItem); *pItem++ = NULL; } } else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE) { /* Release fields in submessages */ void *pItem = *(void**)iter.pData; size_t count = (pItem ? 1 : 0); if (PB_HTYPE(type) == PB_HTYPE_REPEATED) { count = *(size_t*)iter.pSize; } while (count--) { pb_release((const pb_field_t*)iter.pos->ptr, pItem); pItem = (uint8_t*)pItem + iter.pos->data_size; } } /* Release main item */ pb_free(*(void**)iter.pData); *(void**)iter.pData = NULL; } } while (pb_field_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) { #ifdef __BIG_ENDIAN__ uint8_t *bytes = (uint8_t*)dest; uint8_t lebytes[4]; if (!pb_read(stream, lebytes, 4)) return false; bytes[0] = lebytes[3]; bytes[1] = lebytes[2]; bytes[2] = lebytes[1]; bytes[3] = lebytes[0]; return true; #else return pb_read(stream, (uint8_t*)dest, 4); #endif } bool pb_decode_fixed64(pb_istream_t *stream, void *dest) { #ifdef __BIG_ENDIAN__ uint8_t *bytes = (uint8_t*)dest; uint8_t lebytes[8]; if (!pb_read(stream, lebytes, 8)) return false; bytes[0] = lebytes[7]; bytes[1] = lebytes[6]; bytes[2] = lebytes[5]; bytes[3] = lebytes[4]; bytes[4] = lebytes[3]; bytes[5] = lebytes[2]; bytes[6] = lebytes[1]; bytes[7] = lebytes[0]; return true; #else return pb_read(stream, (uint8_t*)dest, 8); #endif } static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest) { uint64_t value; if (!pb_decode_varint(stream, &value)) return false; switch (field->data_size) { case 1: *(int8_t*)dest = (int8_t)value; break; case 2: *(int16_t*)dest = (int16_t)value; break; case 4: *(int32_t*)dest = (int32_t)value; break; case 8: *(int64_t*)dest = (int64_t)value; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); } return true; } static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest) { uint64_t value; if (!pb_decode_varint(stream, &value)) return false; switch (field->data_size) { case 4: *(uint32_t*)dest = (uint32_t)value; break; case 8: *(uint64_t*)dest = value; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); } return true; } static bool checkreturn pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest) { int64_t value; if (!pb_decode_svarint(stream, &value)) return false; switch (field->data_size) { case 4: *(int32_t*)dest = (int32_t)value; break; case 8: *(int64_t*)dest = value; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); } return true; } static bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest) { 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) { 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; pb_bytes_array_t *bdest; if (!pb_decode_varint32(stream, &size)) return false; 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, PB_BYTES_ARRAY_T_ALLOCSIZE(size), 1)) return false; bdest = *(pb_bytes_array_t**)dest; #endif } else { if (PB_BYTES_ARRAY_T_ALLOCSIZE(size) > field->data_size) PB_RETURN_ERROR(stream, "bytes overflow"); bdest = (pb_bytes_array_t*)dest; } bdest->size = 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 (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, (uint8_t*)dest, size); *((uint8_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; }