huaiyu wei
this is a sample for mbed(LPC1768)
Diff: serialization_lib/pb_decode.c
- Revision:
- 0:3163adfd2cf1
diff -r 000000000000 -r 3163adfd2cf1 serialization_lib/pb_decode.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/serialization_lib/pb_decode.c Thu Nov 19 10:17:55 2015 +0800
@@ -0,0 +1,935 @@
+/* pb_decode.c -- decode a protobuf using minimal resources
+ *
+ * 2011 Petteri Aimonen <jpa@kapsi.fi>
+ */
+
+/* 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
+
+#define NANOPB_INTERNALS
+#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)
+ 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))
+ {
+ /* 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;
+ }
+
+ 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;
+ }
+ 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 && *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");
+ }
+}
+
+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_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;
+ bool dummy;
+
+ 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 = &dummy;
+
+ 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 && 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;
+ 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);
+
+ /* Initialize size/has fields and apply default values */
+ do
+ {
+ pb_type_t type;
+ type = iter.pos->type;
+
+ if (iter.pos->tag == 0)
+ continue;
+
+ if (PB_ATYPE(type) == PB_ATYPE_STATIC)
+ {
+ /* Initialize the size field for optional/repeated fields to 0. */
+ if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL)
+ {
+ *(bool*)iter.pSize = false;
+ }
+ else if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
+ {
+ *(size_t*)iter.pSize = 0;
+ continue; /* Array is empty, no need to initialize contents */
+ }
+
+ /* Initialize field contents to default value */
+ if (PB_LTYPE(iter.pos->type) == PB_LTYPE_SUBMESSAGE)
+ {
+ pb_message_set_to_defaults((const pb_field_t *) iter.pos->ptr, iter.pData);
+ }
+ else if (iter.pos->ptr != NULL)
+ {
+ memcpy(iter.pData, iter.pos->ptr, iter.pos->data_size);
+ }
+ else
+ {
+ memset(iter.pData, 0, iter.pos->data_size);
+ }
+ }
+ else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK)
+ {
+ continue; /* 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}; /* Used to check for required fields */
+ 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)
+ 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)
+{
+ pb_message_set_to_defaults(fields, dest_struct);
+ return pb_decode_noinit(stream, fields, dest_struct);
+}
+
+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;
+}
+
+/* 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
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
+bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest)
+{
+ UNUSED(field);
+ return pb_decode_fixed32(stream, dest);
+}
+
+bool checkreturn pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest)
+{
+ UNUSED(field);
+ return pb_decode_fixed64(stream, dest);
+}
+
+bool checkreturn pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest)
+{
+ pb_bytes_array_t *x = (pb_bytes_array_t*)dest;
+
+ uint32_t temp;
+ if (!pb_decode_varint32(stream, &temp))
+ return false;
+ x->size = temp;
+
+ /* Check length, noting the space taken by the size_t header. */
+ if (x->size > field->data_size - offsetof(pb_bytes_array_t, bytes))
+ PB_RETURN_ERROR(stream, "bytes overflow");
+
+ return pb_read(stream, x->bytes, x->size);
+}
+
+bool checkreturn pb_dec_string(pb_istream_t *stream, const pb_field_t *field, void *dest)
+{
+ uint32_t size;
+ bool status;
+ if (!pb_decode_varint32(stream, &size))
+ return false;
+
+ /* Check length, noting the null terminator */
+ if (size + 1 > field->data_size)
+ PB_RETURN_ERROR(stream, "string overflow");
+
+ status = pb_read(stream, (uint8_t*)dest, size);
+ *((uint8_t*)dest + size) = 0;
+ return status;
+}
+
+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;
+}