X-Git-Url: https://gerrit.automotivelinux.org/gerrit/gitweb?a=blobdiff_plain;f=pb_encode.c;h=cc372b8f5771490b22ba6b8bc76f60856f090dd8;hb=e02c65389493d195ee868bf927923108a753bf57;hp=9c3ed2d497530854ab840788d7c8dc3797b81dfe;hpb=4ae3b2e5661b154cd1f7e545f6052d271306ff25;p=apps%2Fagl-service-can-low-level.git diff --git a/pb_encode.c b/pb_encode.c index 9c3ed2d4..cc372b8f 100644 --- a/pb_encode.c +++ b/pb_encode.c @@ -3,9 +3,9 @@ * 2011 Petteri Aimonen */ -#define NANOPB_INTERNALS #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 and gcc before 3.4.0 just @@ -173,11 +173,15 @@ static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *fie if (!pb_encode_tag_for_field(stream, field)) return false; - /* Special case for strings */ + /* 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_STRING || + PB_LTYPE(field->type) == PB_LTYPE_BYTES)) { - if (!func(stream, field, *(const void**)p)) + if (!func(stream, field, *(const void* const*)p)) return false; } else @@ -192,32 +196,38 @@ static bool checkreturn encode_array(pb_ostream_t *stream, const pb_field_t *fie return true; } -/* Encode a field with static allocation, i.e. one whose data is stored - * in the structure itself. */ -static bool checkreturn encode_static_field(pb_ostream_t *stream, +/* 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_t *field, const void *pData) { pb_encoder_t func; const void *pSize; - bool dummy = true; + bool implicit_has = true; func = PB_ENCODERS[PB_LTYPE(field->type)]; if (field->size_offset) pSize = (const char*)pData + field->size_offset; - else if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) - pSize = *(const void**)pData ? &dummy : pData; else - pSize = &dummy; + pSize = &implicit_has; if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) - pData = *(const void**)pData; + { + /* pData is a pointer to the field, which contains pointer to + * the data. If the 2nd pointer is NULL, it is interpreted as if + * the has_field was false. + */ + + pData = *(const void* const*)pData; + implicit_has = (pData != NULL); + } switch (PB_HTYPE(field->type)) { case PB_HTYPE_REQUIRED: if (!pData) - return false; + PB_RETURN_ERROR(stream, "missing required field"); if (!pb_encode_tag_for_field(stream, field)) return false; if (!func(stream, field, pData)) @@ -236,10 +246,21 @@ static bool checkreturn encode_static_field(pb_ostream_t *stream, break; case PB_HTYPE_REPEATED: - if (!encode_array(stream, field, pData, *(const size_t*)pSize, func)) + if (!encode_array(stream, field, pData, *(const pb_size_t*)pSize, func)) return false; break; + case PB_HTYPE_ONEOF: + if (*(const pb_size_t*)pSize == field->tag) + { + if (!pb_encode_tag_for_field(stream, field)) + return false; + + if (!func(stream, field, pData)) + return false; + } + break; + default: PB_RETURN_ERROR(stream, "invalid field type"); } @@ -276,7 +297,7 @@ static bool checkreturn encode_field(pb_ostream_t *stream, { case PB_ATYPE_STATIC: case PB_ATYPE_POINTER: - return encode_static_field(stream, field, pData); + return encode_basic_field(stream, field, pData); case PB_ATYPE_CALLBACK: return encode_callback_field(stream, field, pData); @@ -292,7 +313,18 @@ static bool checkreturn default_extension_encoder(pb_ostream_t *stream, const pb_extension_t *extension) { const pb_field_t *field = (const pb_field_t*)extension->type->arg; - return encode_field(stream, field, extension->dest); + + 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. */ + return encode_field(stream, field, &extension->dest); + } + else + { + return encode_field(stream, field, extension->dest); + } } /* Walk through all the registered extensions and give them a chance @@ -301,7 +333,7 @@ static bool checkreturn encode_extension_field(pb_ostream_t *stream, const pb_field_t *field, const void *pData) { const pb_extension_t *extension = *(const pb_extension_t* const *)pData; - UNUSED(field); + PB_UNUSED(field); while (extension) { @@ -324,42 +356,38 @@ static bool checkreturn encode_extension_field(pb_ostream_t *stream, * Encode all fields * *********************/ +static void *remove_const(const void *p) +{ + /* Note: this casts away const, in order to use the common field iterator + * logic for both encoding and decoding. */ + union { + void *p1; + const void *p2; + } t; + t.p2 = p; + return t.p1; +} + bool checkreturn pb_encode(pb_ostream_t *stream, const pb_field_t fields[], const void *src_struct) { - const pb_field_t *field = fields; - const void *pData = src_struct; - size_t prev_size = 0; + pb_field_iter_t iter; + if (!pb_field_iter_begin(&iter, fields, remove_const(src_struct))) + return true; /* Empty message type */ - while (field->tag != 0) - { - pData = (const char*)pData + prev_size + field->data_offset; - if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) - prev_size = sizeof(const void*); - else - prev_size = field->data_size; - - /* Special case for static arrays */ - if (PB_ATYPE(field->type) == PB_ATYPE_STATIC && - PB_HTYPE(field->type) == PB_HTYPE_REPEATED) - { - prev_size *= field->array_size; - } - - if (PB_LTYPE(field->type) == PB_LTYPE_EXTENSION) + do { + if (PB_LTYPE(iter.pos->type) == PB_LTYPE_EXTENSION) { /* Special case for the extension field placeholder */ - if (!encode_extension_field(stream, field, pData)) + if (!encode_extension_field(stream, iter.pos, iter.pData)) return false; } else { /* Regular field */ - if (!encode_field(stream, field, pData)) + if (!encode_field(stream, iter.pos, iter.pData)) return false; } - - field++; - } + } while (pb_field_iter_next(&iter)); return true; } @@ -369,6 +397,17 @@ bool pb_encode_delimited(pb_ostream_t *stream, const pb_field_t fields[], const return pb_encode_submessage(stream, fields, src_struct); } +bool pb_get_encoded_size(size_t *size, const pb_field_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 * ********************/ @@ -395,9 +434,9 @@ bool checkreturn pb_encode_svarint(pb_ostream_t *stream, int64_t value) { uint64_t zigzagged; if (value < 0) - zigzagged = (uint64_t)(~(value << 1)); + zigzagged = ~((uint64_t)value << 1); else - zigzagged = (uint64_t)(value << 1); + zigzagged = (uint64_t)value << 1; return pb_encode_varint(stream, zigzagged); } @@ -438,7 +477,7 @@ bool checkreturn pb_encode_fixed64(pb_ostream_t *stream, const void *value) bool checkreturn pb_encode_tag(pb_ostream_t *stream, pb_wire_type_t wiretype, uint32_t field_number) { - uint64_t tag = wiretype | (field_number << 3); + uint64_t tag = ((uint64_t)field_number << 3) | wiretype; return pb_encode_varint(stream, tag); } @@ -490,7 +529,12 @@ bool checkreturn pb_encode_submessage(pb_ostream_t *stream, const pb_field_t fie bool status; if (!pb_encode(&substream, fields, src_struct)) + { +#ifndef PB_NO_ERRMSG + stream->errmsg = substream.errmsg; +#endif return false; + } size = substream.bytes_written; @@ -529,12 +573,12 @@ bool checkreturn pb_encode_submessage(pb_ostream_t *stream, const pb_field_t fie /* Field encoders */ -bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, const void *src) { int64_t value = 0; /* Cases 1 and 2 are for compilers that have smaller types for bool - * or enums. */ + * or enums, and for int_size option. */ switch (field->data_size) { case 1: value = *(const int8_t*)src; break; @@ -547,12 +591,14 @@ bool checkreturn pb_enc_varint(pb_ostream_t *stream, const pb_field_t *field, co return pb_encode_varint(stream, (uint64_t)value); } -bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, const void *src) { uint64_t value = 0; switch (field->data_size) { + case 1: value = *(const uint8_t*)src; break; + case 2: value = *(const uint16_t*)src; break; case 4: value = *(const uint32_t*)src; break; case 8: value = *(const uint64_t*)src; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); @@ -561,12 +607,14 @@ bool checkreturn pb_enc_uvarint(pb_ostream_t *stream, const pb_field_t *field, c return pb_encode_varint(stream, value); } -bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, const void *src) { int64_t value = 0; switch (field->data_size) { + case 1: value = *(const int8_t*)src; break; + case 2: value = *(const int16_t*)src; break; case 4: value = *(const int32_t*)src; break; case 8: value = *(const int64_t*)src; break; default: PB_RETURN_ERROR(stream, "invalid data_size"); @@ -575,60 +623,64 @@ bool checkreturn pb_enc_svarint(pb_ostream_t *stream, const pb_field_t *field, c return pb_encode_svarint(stream, value); } -bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_fixed64(pb_ostream_t *stream, const pb_field_t *field, const void *src) { - UNUSED(field); + PB_UNUSED(field); return pb_encode_fixed64(stream, src); } -bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_fixed32(pb_ostream_t *stream, const pb_field_t *field, const void *src) { - UNUSED(field); + PB_UNUSED(field); return pb_encode_fixed32(stream, src); } -bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_bytes(pb_ostream_t *stream, const pb_field_t *field, const void *src) { const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)src; - - if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) + + if (src == NULL) { - return pb_encode_string(stream, *(const uint8_t**)bytes->bytes, bytes->size); + /* Threat null pointer as an empty bytes field */ + return pb_encode_string(stream, NULL, 0); } - else + + if (PB_ATYPE(field->type) == PB_ATYPE_STATIC && + PB_BYTES_ARRAY_T_ALLOCSIZE(bytes->size) > field->data_size) { - if (bytes->size + offsetof(pb_bytes_array_t, bytes) > field->data_size) - PB_RETURN_ERROR(stream, "bytes size exceeded"); - - return pb_encode_string(stream, bytes->bytes, bytes->size); + PB_RETURN_ERROR(stream, "bytes size exceeded"); } + + return pb_encode_string(stream, bytes->bytes, bytes->size); } -bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_string(pb_ostream_t *stream, const pb_field_t *field, const void *src) { - /* strnlen() is not always available, so just use a for-loop */ size_t size = 0; + size_t max_size = field->data_size; const char *p = (const char*)src; + if (PB_ATYPE(field->type) == PB_ATYPE_POINTER) + max_size = (size_t)-1; + + if (src == NULL) { - while (*p != '\0') - { - size++; - p++; - } + size = 0; /* Threat null pointer as an empty string */ } else { - while (size < field->data_size && *p != '\0') + /* strnlen() is not always available, so just use a loop */ + while (size < max_size && *p != '\0') { size++; p++; } } + return pb_encode_string(stream, (const uint8_t*)src, size); } -bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src) +static bool checkreturn pb_enc_submessage(pb_ostream_t *stream, const pb_field_t *field, const void *src) { if (field->ptr == NULL) PB_RETURN_ERROR(stream, "invalid field descriptor");