| /* pb_encode.c -- encode a protobuf using minimal resources |
| * |
| * 2011 Petteri Aimonen <jpa@kapsi.fi> |
| */ |
| |
| #include "pb.h" |
| #include "pb_encode.h" |
| #include "pb_common.h" |
| |
| /* Use the GCC warn_unused_result attribute to check that all return values |
| * are propagated correctly. On other compilers, gcc before 3.4.0 and iar |
| * before 9.40.1 just ignore the annotation. |
| */ |
| #if (defined(__GNUC__) && ((__GNUC__ > 3) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4))) || \ |
| (defined(__IAR_SYSTEMS_ICC__) && (__VER__ >= 9040001)) |
| #define checkreturn __attribute__((warn_unused_result)) |
| #else |
| #define checkreturn |
| #endif |
| |
| /************************************** |
| * Declarations internal to this file * |
| **************************************/ |
| static bool checkreturn buf_write(pb_ostream_t *stream, const pb_byte_t *buf, size_t count); |
| static bool checkreturn encode_array(pb_ostream_t *stream, pb_field_iter_t *field); |
| static bool checkreturn pb_check_proto3_default_value(const pb_field_iter_t *field); |
| static bool checkreturn encode_basic_field(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn encode_callback_field(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn encode_field(pb_ostream_t *stream, pb_field_iter_t *field); |
| static bool checkreturn encode_extension_field(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn default_extension_encoder(pb_ostream_t *stream, const pb_extension_t *extension); |
| static bool checkreturn pb_encode_varint_32(pb_ostream_t *stream, uint32_t low, uint32_t high); |
| static bool checkreturn pb_enc_bool(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn pb_enc_fixed(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_iter_t *field); |
| static bool checkreturn pb_enc_fixed_length_bytes(pb_ostream_t *stream, const pb_field_iter_t *field); |
| |
| #ifdef PB_WITHOUT_64BIT |
| #define pb_int64_t int32_t |
| #define pb_uint64_t uint32_t |
| #else |
| #define pb_int64_t int64_t |
| #define pb_uint64_t uint64_t |
| #endif |
| |
| /******************************* |
| * pb_ostream_t implementation * |
| *******************************/ |
| |
| static bool checkreturn buf_write(pb_ostream_t *stream, const pb_byte_t *buf, size_t count) |
| { |
| pb_byte_t *dest = (pb_byte_t*)stream->state; |
| stream->state = dest + count; |
| |
| memcpy(dest, buf, count * sizeof(pb_byte_t)); |
| |
| return true; |
| } |
| |
| pb_ostream_t pb_ostream_from_buffer(pb_byte_t *buf, size_t bufsize) |
| { |
| pb_ostream_t stream; |
| #ifdef PB_BUFFER_ONLY |
| /* In PB_BUFFER_ONLY configuration the callback pointer is just int*. |
| * NULL pointer marks a sizing field, so put a non-NULL value to mark a buffer stream. |
| */ |
| static const int marker = 0; |
| stream.callback = ▮ |
| #else |
| stream.callback = &buf_write; |
| #endif |
| stream.state = buf; |
| stream.max_size = bufsize; |
| stream.bytes_written = 0; |
| #ifndef PB_NO_ERRMSG |
| stream.errmsg = NULL; |
| #endif |
| return stream; |
| } |
| |
| bool checkreturn pb_write(pb_ostream_t *stream, const pb_byte_t *buf, size_t count) |
| { |
| if (count > 0 && stream->callback != NULL) |
| { |
| if (stream->bytes_written + count < stream->bytes_written || |
| stream->bytes_written + count > stream->max_size) |
| { |
| PB_RETURN_ERROR(stream, "stream full"); |
| } |
| |
| #ifdef PB_BUFFER_ONLY |
| if (!buf_write(stream, buf, count)) |
| PB_RETURN_ERROR(stream, "io error"); |
| #else |
| if (!stream->callback(stream, buf, count)) |
| PB_RETURN_ERROR(stream, "io error"); |
| #endif |
| } |
| |
| stream->bytes_written += count; |
| return true; |
| } |
| |
| /************************* |
| * Encode a single field * |
| *************************/ |
| |
| /* Read a bool value without causing undefined behavior even if the value |
| * is invalid. See issue #434 and |
| * https://stackoverflow.com/questions/27661768/weird-results-for-conditional |
| */ |
| static bool safe_read_bool(const void *pSize) |
| { |
| const char *p = (const char *)pSize; |
| size_t i; |
| for (i = 0; i < sizeof(bool); i++) |
| { |
| if (p[i] != 0) |
| return true; |
| } |
| return false; |
| } |
| |
| /* Encode a static array. Handles the size calculations and possible packing. */ |
| static bool checkreturn encode_array(pb_ostream_t *stream, pb_field_iter_t *field) |
| { |
| pb_size_t i; |
| pb_size_t count; |
| #ifndef PB_ENCODE_ARRAYS_UNPACKED |
| size_t size; |
| #endif |
| |
| count = *(pb_size_t*)field->pSize; |
| |
| if (count == 0) |
| return true; |
| |
| if (PB_ATYPE(field->type) != PB_ATYPE_POINTER && count > field->array_size) |
| PB_RETURN_ERROR(stream, "array max size exceeded"); |
| |
| #ifndef PB_ENCODE_ARRAYS_UNPACKED |
| /* We always pack arrays if the datatype allows it. */ |
| if (PB_LTYPE(field->type) <= PB_LTYPE_LAST_PACKABLE) |
| { |
| if (!pb_encode_tag(stream, PB_WT_STRING, field->tag)) |
| return false; |
| |
| /* Determine the total size of packed array. */ |
| if (PB_LTYPE(field->type) == PB_LTYPE_FIXED32) |
| { |
| size = 4 * (size_t)count; |
| } |
| else if (PB_LTYPE(field->type) == PB_LTYPE_FIXED64) |
| { |
| size = 8 * (size_t)count; |
| } |
| else |
| { |
| pb_ostream_t sizestream = PB_OSTREAM_SIZING; |
| void *pData_orig = field->pData; |
| for (i = 0; i < count; i++) |
| { |
| if (!pb_enc_varint(&sizestream, field)) |
| PB_RETURN_ERROR(stream, PB_GET_ERROR(&sizestream)); |
| field->pData = (char*)field->pData + field->data_size; |
| } |
| field->pData = pData_orig; |
| size = sizestream.bytes_written; |
| } |
| |
| if (!pb_encode_varint(stream, (pb_uint64_t)size)) |
| return false; |
| |
| if (stream->callback == NULL) |
| return pb_write(stream, NULL, size); /* Just sizing.. */ |
| |
| /* Write the data */ |
| for (i = 0; i < count; i++) |
| { |
| if (PB_LTYPE(field->type) == PB_LTYPE_FIXED32 || PB_LTYPE(field->type) == PB_LTYPE_FIXED64) |
| { |
| if (!pb_enc_fixed(stream, field)) |
| return false; |
| } |
| else |
| { |
| if (!pb_enc_varint(stream, field)) |
| return false; |
| } |
| |
| field->pData = (char*)field->pData + field->data_size; |
| } |
| } |
| else /* Unpacked fields */ |
| #endif |
| { |
| for (i = 0; i < count; i++) |
| { |
| /* Normally the data is stored directly in the array entries, but |
| * for pointer-type string and bytes fields, the array entries are |
| * actually pointers themselves also. So we have to dereference once |
| * more to get to the actual data. */ |
| if (PB_ATYPE(field->type) == PB_ATYPE_POINTER && |
| (PB_LTYPE(field->type) == PB_LTYPE_STRING || |
| PB_LTYPE(field->type) == PB_LTYPE_BYTES)) |
| { |
| bool status; |
| void *pData_orig = field->pData; |
| field->pData = *(void* const*)field->pData; |
| |
| if (!field->pData) |
| { |
| /* Null pointer in array is treated as empty string / bytes */ |
| status = pb_encode_tag_for_field(stream, field) && |
| pb_encode_varint(stream, 0); |
| } |
| else |
| { |
| status = encode_basic_field(stream, field); |
| } |
| |
| field->pData = pData_orig; |
| |
| if (!status) |
| return false; |
| } |
| else |
| { |
| if (!encode_basic_field(stream, field)) |
| return false; |
| } |
| field->pData = (char*)field->pData + field->data_size; |
| } |
| } |
| |
| return true; |
| } |
| |
| /* In proto3, all fields are optional and are only encoded if their value is "non-zero". |
| * This function implements the check for the zero value. */ |
| static bool checkreturn pb_check_proto3_default_value(const pb_field_iter_t *field) |
| { |
| pb_type_t type = field->type; |
| |
| if (PB_ATYPE(type) == PB_ATYPE_STATIC) |
| { |
| if (PB_HTYPE(type) == PB_HTYPE_REQUIRED) |
| { |
| /* Required proto2 fields inside proto3 submessage, pretty rare case */ |
| return false; |
| } |
| else if (PB_HTYPE(type) == PB_HTYPE_REPEATED) |
| { |
| /* Repeated fields inside proto3 submessage: present if count != 0 */ |
| return *(const pb_size_t*)field->pSize == 0; |
| } |
| else if (PB_HTYPE(type) == PB_HTYPE_ONEOF) |
| { |
| /* Oneof fields */ |
| return *(const pb_size_t*)field->pSize == 0; |
| } |
| else if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL && field->pSize != NULL) |
| { |
| /* Proto2 optional fields inside proto3 message, or proto3 |
| * submessage fields. */ |
| return safe_read_bool(field->pSize) == false; |
| } |
| else if (field->descriptor->default_value) |
| { |
| /* Proto3 messages do not have default values, but proto2 messages |
| * can contain optional fields without has_fields (generator option 'proto3'). |
| * In this case they must always be encoded, to make sure that the |
| * non-zero default value is overwritten. |
| */ |
| return false; |
| } |
| |
| /* Rest is proto3 singular fields */ |
| if (PB_LTYPE(type) <= PB_LTYPE_LAST_PACKABLE) |
| { |
| /* Simple integer / float fields */ |
| pb_size_t i; |
| const char *p = (const char*)field->pData; |
| for (i = 0; i < field->data_size; i++) |
| { |
| if (p[i] != 0) |
| { |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| else if (PB_LTYPE(type) == PB_LTYPE_BYTES) |
| { |
| const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)field->pData; |
| return bytes->size == 0; |
| } |
| else if (PB_LTYPE(type) == PB_LTYPE_STRING) |
| { |
| return *(const char*)field->pData == '\0'; |
| } |
| else if (PB_LTYPE(type) == PB_LTYPE_FIXED_LENGTH_BYTES) |
| { |
| /* Fixed length bytes is only empty if its length is fixed |
| * as 0. Which would be pretty strange, but we can check |
| * it anyway. */ |
| return field->data_size == 0; |
| } |
| else if (PB_LTYPE_IS_SUBMSG(type)) |
| { |
| /* Check all fields in the submessage to find if any of them |
| * are non-zero. The comparison cannot be done byte-per-byte |
| * because the C struct may contain padding bytes that must |
| * be skipped. Note that usually proto3 submessages have |
| * a separate has_field that is checked earlier in this if. |
| */ |
| pb_field_iter_t iter; |
| if (pb_field_iter_begin(&iter, field->submsg_desc, field->pData)) |
| { |
| do |
| { |
| if (!pb_check_proto3_default_value(&iter)) |
| { |
| return false; |
| } |
| } while (pb_field_iter_next(&iter)); |
| } |
| return true; |
| } |
| } |
| else if (PB_ATYPE(type) == PB_ATYPE_POINTER) |
| { |
| return field->pData == NULL; |
| } |
| else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK) |
| { |
| if (PB_LTYPE(type) == PB_LTYPE_EXTENSION) |
| { |
| const pb_extension_t *extension = *(const pb_extension_t* const *)field->pData; |
| return extension == NULL; |
| } |
| else if (field->descriptor->field_callback == pb_default_field_callback) |
| { |
| pb_callback_t *pCallback = (pb_callback_t*)field->pData; |
| return pCallback->funcs.encode == NULL; |
| } |
| else |
| { |
| return field->descriptor->field_callback == NULL; |
| } |
| } |
| |
| return false; /* Not typically reached, safe default for weird special cases. */ |
| } |
| |
| /* Encode a field with static or pointer allocation, i.e. one whose data |
| * is available to the encoder directly. */ |
| static bool checkreturn encode_basic_field(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| if (!field->pData) |
| { |
| /* Missing pointer field */ |
| return true; |
| } |
| |
| if (!pb_encode_tag_for_field(stream, field)) |
| return false; |
| |
| switch (PB_LTYPE(field->type)) |
| { |
| case PB_LTYPE_BOOL: |
| return pb_enc_bool(stream, field); |
| |
| case PB_LTYPE_VARINT: |
| case PB_LTYPE_UVARINT: |
| case PB_LTYPE_SVARINT: |
| return pb_enc_varint(stream, field); |
| |
| case PB_LTYPE_FIXED32: |
| case PB_LTYPE_FIXED64: |
| return pb_enc_fixed(stream, field); |
| |
| case PB_LTYPE_BYTES: |
| return pb_enc_bytes(stream, field); |
| |
| case PB_LTYPE_STRING: |
| return pb_enc_string(stream, field); |
| |
| case PB_LTYPE_SUBMESSAGE: |
| case PB_LTYPE_SUBMSG_W_CB: |
| return pb_enc_submessage(stream, field); |
| |
| case PB_LTYPE_FIXED_LENGTH_BYTES: |
| return pb_enc_fixed_length_bytes(stream, field); |
| |
| default: |
| PB_RETURN_ERROR(stream, "invalid field type"); |
| } |
| } |
| |
| /* Encode a field with callback semantics. This means that a user function is |
| * called to provide and encode the actual data. */ |
| static bool checkreturn encode_callback_field(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| if (field->descriptor->field_callback != NULL) |
| { |
| if (!field->descriptor->field_callback(NULL, stream, field)) |
| PB_RETURN_ERROR(stream, "callback error"); |
| } |
| return true; |
| } |
| |
| /* Encode a single field of any callback, pointer or static type. */ |
| static bool checkreturn encode_field(pb_ostream_t *stream, pb_field_iter_t *field) |
| { |
| /* Check field presence */ |
| if (PB_HTYPE(field->type) == PB_HTYPE_ONEOF) |
| { |
| if (*(const pb_size_t*)field->pSize != field->tag) |
| { |
| /* Different type oneof field */ |
| return true; |
| } |
| } |
| else if (PB_HTYPE(field->type) == PB_HTYPE_OPTIONAL) |
| { |
| if (field->pSize) |
| { |
| if (safe_read_bool(field->pSize) == false) |
| { |
| /* Missing optional field */ |
| return true; |
| } |
| } |
| else if (PB_ATYPE(field->type) == PB_ATYPE_STATIC) |
| { |
| /* Proto3 singular field */ |
| if (pb_check_proto3_default_value(field)) |
| return true; |
| } |
| } |
| |
| if (!field->pData) |
| { |
| if (PB_HTYPE(field->type) == PB_HTYPE_REQUIRED) |
| PB_RETURN_ERROR(stream, "missing required field"); |
| |
| /* Pointer field set to NULL */ |
| return true; |
| } |
| |
| /* Then encode field contents */ |
| if (PB_ATYPE(field->type) == PB_ATYPE_CALLBACK) |
| { |
| return encode_callback_field(stream, field); |
| } |
| else if (PB_HTYPE(field->type) == PB_HTYPE_REPEATED) |
| { |
| return encode_array(stream, field); |
| } |
| else |
| { |
| return encode_basic_field(stream, field); |
| } |
| } |
| |
| /* Default handler for extension fields. Expects to have a pb_msgdesc_t |
| * pointer in the extension->type->arg field, pointing to a message with |
| * only one field in it. */ |
| static bool checkreturn default_extension_encoder(pb_ostream_t *stream, const pb_extension_t *extension) |
| { |
| pb_field_iter_t iter; |
| |
| if (!pb_field_iter_begin_extension_const(&iter, extension)) |
| PB_RETURN_ERROR(stream, "invalid extension"); |
| |
| return encode_field(stream, &iter); |
| } |
| |
| |
| /* Walk through all the registered extensions and give them a chance |
| * to encode themselves. */ |
| static bool checkreturn encode_extension_field(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| const pb_extension_t *extension = *(const pb_extension_t* const *)field->pData; |
| |
| while (extension) |
| { |
| bool status; |
| if (extension->type->encode) |
| status = extension->type->encode(stream, extension); |
| else |
| status = default_extension_encoder(stream, extension); |
| |
| if (!status) |
| return false; |
| |
| extension = extension->next; |
| } |
| |
| return true; |
| } |
| |
| /********************* |
| * Encode all fields * |
| *********************/ |
| |
| bool checkreturn pb_encode(pb_ostream_t *stream, const pb_msgdesc_t *fields, const void *src_struct) |
| { |
| pb_field_iter_t iter; |
| if (!pb_field_iter_begin_const(&iter, fields, src_struct)) |
| return true; /* Empty message type */ |
| |
| do { |
| if (PB_LTYPE(iter.type) == PB_LTYPE_EXTENSION) |
| { |
| /* Special case for the extension field placeholder */ |
| if (!encode_extension_field(stream, &iter)) |
| return false; |
| } |
| else |
| { |
| /* Regular field */ |
| if (!encode_field(stream, &iter)) |
| return false; |
| } |
| } while (pb_field_iter_next(&iter)); |
| |
| return true; |
| } |
| |
| bool checkreturn pb_encode_ex(pb_ostream_t *stream, const pb_msgdesc_t *fields, const void *src_struct, unsigned int flags) |
| { |
| if ((flags & PB_ENCODE_DELIMITED) != 0) |
| { |
| return pb_encode_submessage(stream, fields, src_struct); |
| } |
| else if ((flags & PB_ENCODE_NULLTERMINATED) != 0) |
| { |
| const pb_byte_t zero = 0; |
| |
| if (!pb_encode(stream, fields, src_struct)) |
| return false; |
| |
| return pb_write(stream, &zero, 1); |
| } |
| else |
| { |
| return pb_encode(stream, fields, src_struct); |
| } |
| } |
| |
| bool pb_get_encoded_size(size_t *size, const pb_msgdesc_t *fields, const void *src_struct) |
| { |
| pb_ostream_t stream = PB_OSTREAM_SIZING; |
| |
| if (!pb_encode(&stream, fields, src_struct)) |
| return false; |
| |
| *size = stream.bytes_written; |
| return true; |
| } |
| |
| /******************** |
| * Helper functions * |
| ********************/ |
| |
| /* This function avoids 64-bit shifts as they are quite slow on many platforms. */ |
| static bool checkreturn pb_encode_varint_32(pb_ostream_t *stream, uint32_t low, uint32_t high) |
| { |
| size_t i = 0; |
| pb_byte_t buffer[10]; |
| pb_byte_t byte = (pb_byte_t)(low & 0x7F); |
| low >>= 7; |
| |
| while (i < 4 && (low != 0 || high != 0)) |
| { |
| byte |= 0x80; |
| buffer[i++] = byte; |
| byte = (pb_byte_t)(low & 0x7F); |
| low >>= 7; |
| } |
| |
| if (high) |
| { |
| byte = (pb_byte_t)(byte | ((high & 0x07) << 4)); |
| high >>= 3; |
| |
| while (high) |
| { |
| byte |= 0x80; |
| buffer[i++] = byte; |
| byte = (pb_byte_t)(high & 0x7F); |
| high >>= 7; |
| } |
| } |
| |
| buffer[i++] = byte; |
| |
| return pb_write(stream, buffer, i); |
| } |
| |
| bool checkreturn pb_encode_varint(pb_ostream_t *stream, pb_uint64_t value) |
| { |
| if (value <= 0x7F) |
| { |
| /* Fast path: single byte */ |
| pb_byte_t byte = (pb_byte_t)value; |
| return pb_write(stream, &byte, 1); |
| } |
| else |
| { |
| #ifdef PB_WITHOUT_64BIT |
| return pb_encode_varint_32(stream, value, 0); |
| #else |
| return pb_encode_varint_32(stream, (uint32_t)value, (uint32_t)(value >> 32)); |
| #endif |
| } |
| } |
| |
| bool checkreturn pb_encode_svarint(pb_ostream_t *stream, pb_int64_t value) |
| { |
| pb_uint64_t zigzagged; |
| pb_uint64_t mask = ((pb_uint64_t)-1) >> 1; /* Satisfy clang -fsanitize=integer */ |
| if (value < 0) |
| zigzagged = ~(((pb_uint64_t)value & mask) << 1); |
| else |
| zigzagged = (pb_uint64_t)value << 1; |
| |
| return pb_encode_varint(stream, zigzagged); |
| } |
| |
| bool checkreturn pb_encode_fixed32(pb_ostream_t *stream, const void *value) |
| { |
| #if defined(PB_LITTLE_ENDIAN_8BIT) && PB_LITTLE_ENDIAN_8BIT == 1 |
| /* Fast path if we know that we're on little endian */ |
| return pb_write(stream, (const pb_byte_t*)value, 4); |
| #else |
| uint32_t val = *(const uint32_t*)value; |
| pb_byte_t bytes[4]; |
| bytes[0] = (pb_byte_t)(val & 0xFF); |
| bytes[1] = (pb_byte_t)((val >> 8) & 0xFF); |
| bytes[2] = (pb_byte_t)((val >> 16) & 0xFF); |
| bytes[3] = (pb_byte_t)((val >> 24) & 0xFF); |
| return pb_write(stream, bytes, 4); |
| #endif |
| } |
| |
| #ifndef PB_WITHOUT_64BIT |
| bool checkreturn pb_encode_fixed64(pb_ostream_t *stream, const void *value) |
| { |
| #if defined(PB_LITTLE_ENDIAN_8BIT) && PB_LITTLE_ENDIAN_8BIT == 1 |
| /* Fast path if we know that we're on little endian */ |
| return pb_write(stream, (const pb_byte_t*)value, 8); |
| #else |
| uint64_t val = *(const uint64_t*)value; |
| pb_byte_t bytes[8]; |
| bytes[0] = (pb_byte_t)(val & 0xFF); |
| bytes[1] = (pb_byte_t)((val >> 8) & 0xFF); |
| bytes[2] = (pb_byte_t)((val >> 16) & 0xFF); |
| bytes[3] = (pb_byte_t)((val >> 24) & 0xFF); |
| bytes[4] = (pb_byte_t)((val >> 32) & 0xFF); |
| bytes[5] = (pb_byte_t)((val >> 40) & 0xFF); |
| bytes[6] = (pb_byte_t)((val >> 48) & 0xFF); |
| bytes[7] = (pb_byte_t)((val >> 56) & 0xFF); |
| return pb_write(stream, bytes, 8); |
| #endif |
| } |
| #endif |
| |
| bool checkreturn pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, uint32_t field_number) |
| { |
| pb_uint64_t tag = ((pb_uint64_t)field_number << 3) | wiretype; |
| return pb_encode_varint(stream, tag); |
| } |
| |
| bool pb_encode_tag_for_field ( pb_ostream_t* stream, const pb_field_iter_t* field ) |
| { |
| pb_wire_type_t wiretype; |
| switch (PB_LTYPE(field->type)) |
| { |
| case PB_LTYPE_BOOL: |
| 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: |
| case PB_LTYPE_SUBMSG_W_CB: |
| case PB_LTYPE_FIXED_LENGTH_BYTES: |
| 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 pb_byte_t *buffer, size_t size) |
| { |
| if (!pb_encode_varint(stream, (pb_uint64_t)size)) |
| return false; |
| |
| return pb_write(stream, buffer, size); |
| } |
| |
| bool checkreturn pb_encode_submessage(pb_ostream_t *stream, const pb_msgdesc_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, (pb_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_bool(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| uint32_t value = safe_read_bool(field->pData) ? 1 : 0; |
| PB_UNUSED(field); |
| return pb_encode_varint(stream, value); |
| } |
| |
| static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| if (PB_LTYPE(field->type) == PB_LTYPE_UVARINT) |
| { |
| /* Perform unsigned integer extension */ |
| pb_uint64_t value = 0; |
| |
| if (field->data_size == sizeof(uint_least8_t)) |
| value = *(const uint_least8_t*)field->pData; |
| else if (field->data_size == sizeof(uint_least16_t)) |
| value = *(const uint_least16_t*)field->pData; |
| else if (field->data_size == sizeof(uint32_t)) |
| value = *(const uint32_t*)field->pData; |
| else if (field->data_size == sizeof(pb_uint64_t)) |
| value = *(const pb_uint64_t*)field->pData; |
| else |
| PB_RETURN_ERROR(stream, "invalid data_size"); |
| |
| return pb_encode_varint(stream, value); |
| } |
| else |
| { |
| /* Perform signed integer extension */ |
| pb_int64_t value = 0; |
| |
| if (field->data_size == sizeof(int_least8_t)) |
| value = *(const int_least8_t*)field->pData; |
| else if (field->data_size == sizeof(int_least16_t)) |
| value = *(const int_least16_t*)field->pData; |
| else if (field->data_size == sizeof(int32_t)) |
| value = *(const int32_t*)field->pData; |
| else if (field->data_size == sizeof(pb_int64_t)) |
| value = *(const pb_int64_t*)field->pData; |
| else |
| PB_RETURN_ERROR(stream, "invalid data_size"); |
| |
| if (PB_LTYPE(field->type) == PB_LTYPE_SVARINT) |
| return pb_encode_svarint(stream, value); |
| #ifdef PB_WITHOUT_64BIT |
| else if (value < 0) |
| return pb_encode_varint_32(stream, (uint32_t)value, (uint32_t)-1); |
| #endif |
| else |
| return pb_encode_varint(stream, (pb_uint64_t)value); |
| |
| } |
| } |
| |
| static bool checkreturn pb_enc_fixed(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| #ifdef PB_CONVERT_DOUBLE_FLOAT |
| if (field->data_size == sizeof(float) && PB_LTYPE(field->type) == PB_LTYPE_FIXED64) |
| { |
| return pb_encode_float_as_double(stream, *(float*)field->pData); |
| } |
| #endif |
| |
| if (field->data_size == sizeof(uint32_t)) |
| { |
| return pb_encode_fixed32(stream, field->pData); |
| } |
| #ifndef PB_WITHOUT_64BIT |
| else if (field->data_size == sizeof(uint64_t)) |
| { |
| return pb_encode_fixed64(stream, field->pData); |
| } |
| #endif |
| else |
| { |
| PB_RETURN_ERROR(stream, "invalid data_size"); |
| } |
| } |
| |
| static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| const pb_bytes_array_t *bytes = NULL; |
| |
| bytes = (const pb_bytes_array_t*)field->pData; |
| |
| if (bytes == NULL) |
| { |
| /* Treat null pointer as an empty bytes field */ |
| return pb_encode_string(stream, NULL, 0); |
| } |
| |
| if (PB_ATYPE(field->type) == PB_ATYPE_STATIC && |
| bytes->size > field->data_size - offsetof(pb_bytes_array_t, bytes)) |
| { |
| PB_RETURN_ERROR(stream, "bytes size exceeded"); |
| } |
| |
| return pb_encode_string(stream, bytes->bytes, (size_t)bytes->size); |
| } |
| |
| static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| size_t size = 0; |
| size_t max_size = (size_t)field->data_size; |
| const char *str = (const char*)field->pData; |
| |
| if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) |
| { |
| max_size = (size_t)-1; |
| } |
| else |
| { |
| /* pb_dec_string() assumes string fields end with a null |
| * terminator when the type isn't PB_ATYPE_POINTER, so we |
| * shouldn't allow more than max-1 bytes to be written to |
| * allow space for the null terminator. |
| */ |
| if (max_size == 0) |
| PB_RETURN_ERROR(stream, "zero-length string"); |
| |
| max_size -= 1; |
| } |
| |
| |
| if (str == NULL) |
| { |
| size = 0; /* Treat null pointer as an empty string */ |
| } |
| else |
| { |
| const char *p = str; |
| |
| /* strnlen() is not always available, so just use a loop */ |
| while (size < max_size && *p != '\0') |
| { |
| size++; |
| p++; |
| } |
| |
| if (*p != '\0') |
| { |
| PB_RETURN_ERROR(stream, "unterminated string"); |
| } |
| } |
| |
| #ifdef PB_VALIDATE_UTF8 |
| if (!pb_validate_utf8(str)) |
| PB_RETURN_ERROR(stream, "invalid utf8"); |
| #endif |
| |
| return pb_encode_string(stream, (const pb_byte_t*)str, size); |
| } |
| |
| static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| if (field->submsg_desc == NULL) |
| PB_RETURN_ERROR(stream, "invalid field descriptor"); |
| |
| if (PB_LTYPE(field->type) == PB_LTYPE_SUBMSG_W_CB && field->pSize != NULL) |
| { |
| /* Message callback is stored right before pSize. */ |
| pb_callback_t *callback = (pb_callback_t*)field->pSize - 1; |
| if (callback->funcs.encode) |
| { |
| if (!callback->funcs.encode(stream, field, &callback->arg)) |
| return false; |
| } |
| } |
| |
| return pb_encode_submessage(stream, field->submsg_desc, field->pData); |
| } |
| |
| static bool checkreturn pb_enc_fixed_length_bytes(pb_ostream_t *stream, const pb_field_iter_t *field) |
| { |
| return pb_encode_string(stream, (const pb_byte_t*)field->pData, (size_t)field->data_size); |
| } |
| |
| #ifdef PB_CONVERT_DOUBLE_FLOAT |
| bool pb_encode_float_as_double(pb_ostream_t *stream, float value) |
| { |
| union { float f; uint32_t i; } in; |
| uint_least8_t sign; |
| int exponent; |
| uint64_t mantissa; |
| |
| in.f = value; |
| |
| /* Decompose input value */ |
| sign = (uint_least8_t)((in.i >> 31) & 1); |
| exponent = (int)((in.i >> 23) & 0xFF) - 127; |
| mantissa = in.i & 0x7FFFFF; |
| |
| if (exponent == 128) |
| { |
| /* Special value (NaN etc.) */ |
| exponent = 1024; |
| } |
| else if (exponent == -127) |
| { |
| if (!mantissa) |
| { |
| /* Zero */ |
| exponent = -1023; |
| } |
| else |
| { |
| /* Denormalized */ |
| mantissa <<= 1; |
| while (!(mantissa & 0x800000)) |
| { |
| mantissa <<= 1; |
| exponent--; |
| } |
| mantissa &= 0x7FFFFF; |
| } |
| } |
| |
| /* Combine fields */ |
| mantissa <<= 29; |
| mantissa |= (uint64_t)(exponent + 1023) << 52; |
| mantissa |= (uint64_t)sign << 63; |
| |
| return pb_encode_fixed64(stream, &mantissa); |
| } |
| #endif |