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- /* 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
-
- #include "pb.h"
- #include "pb_decode.h"
- #include "pb_common.h"
-
- /**************************************
- * Declarations internal to this file *
- **************************************/
-
- 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, pb_byte_t *buf, size_t count);
- static bool checkreturn read_raw_value(pb_istream_t *stream, pb_wire_type_t wire_type, pb_byte_t *buf, size_t *size);
- static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter);
- static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter);
- static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter);
- static void iter_from_extension(pb_field_iter_t *iter, pb_extension_t *extension);
- 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_iter_t *iter);
- static bool checkreturn find_extension_field(pb_field_iter_t *iter);
- static void pb_field_set_to_default(pb_field_iter_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_decode_varint32_eof(pb_istream_t *stream, uint32_t *dest, bool *eof);
- 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_dec_fixed_length_bytes(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);
-
- #ifdef PB_ENABLE_MALLOC
- static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size);
- static bool checkreturn pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter);
- static void pb_release_single_field(const pb_field_iter_t *iter);
- #endif
-
- #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
-
- /* --- 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_dec_fixed_length_bytes
- };
-
- /*******************************
- * pb_istream_t implementation *
- *******************************/
-
- static bool checkreturn buf_read(pb_istream_t *stream, pb_byte_t *buf, size_t count)
- {
- size_t i;
- const pb_byte_t *source = (const pb_byte_t*)stream->state;
- stream->state = (pb_byte_t*)stream->state + count;
-
- if (buf != NULL)
- {
- for (i = 0; i < count; i++)
- buf[i] = source[i];
- }
-
- return true;
- }
-
- bool checkreturn pb_read(pb_istream_t *stream, pb_byte_t *buf, size_t count)
- {
- #ifndef PB_BUFFER_ONLY
- if (buf == NULL && stream->callback != buf_read)
- {
- /* Skip input bytes */
- pb_byte_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, pb_byte_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 = *(const pb_byte_t*)stream->state;
- stream->state = (pb_byte_t*)stream->state + 1;
- #endif
-
- stream->bytes_left--;
-
- return true;
- }
-
- pb_istream_t pb_istream_from_buffer(const pb_byte_t *buf, size_t bufsize)
- {
- pb_istream_t stream;
- /* Cast away the const from buf without a compiler error. We are
- * careful to use it only in a const manner in the callbacks.
- */
- union {
- void *state;
- const void *c_state;
- } state;
- #ifdef PB_BUFFER_ONLY
- stream.callback = NULL;
- #else
- stream.callback = &buf_read;
- #endif
- state.c_state = buf;
- stream.state = state.state;
- stream.bytes_left = bufsize;
- #ifndef PB_NO_ERRMSG
- stream.errmsg = NULL;
- #endif
- return stream;
- }
-
- /********************
- * Helper functions *
- ********************/
-
- static bool checkreturn pb_decode_varint32_eof(pb_istream_t *stream, uint32_t *dest, bool *eof)
- {
- pb_byte_t byte;
- uint32_t result;
-
- if (!pb_readbyte(stream, &byte))
- {
- if (stream->bytes_left == 0)
- {
- if (eof)
- {
- *eof = true;
- }
- }
-
- return false;
- }
-
- if ((byte & 0x80) == 0)
- {
- /* Quick case, 1 byte value */
- result = byte;
- }
- else
- {
- /* Multibyte case */
- uint_fast8_t bitpos = 7;
- result = byte & 0x7F;
-
- do
- {
- if (!pb_readbyte(stream, &byte))
- return false;
-
- if (bitpos >= 32)
- {
- /* Note: The varint could have trailing 0x80 bytes, or 0xFF for negative. */
- uint8_t sign_extension = (bitpos < 63) ? 0xFF : 0x01;
-
- if ((byte & 0x7F) != 0x00 && ((result >> 31) == 0 || byte != sign_extension))
- {
- PB_RETURN_ERROR(stream, "varint overflow");
- }
- }
- else
- {
- result |= (uint32_t)(byte & 0x7F) << bitpos;
- }
- bitpos = (uint_fast8_t)(bitpos + 7);
- } while (byte & 0x80);
-
- if (bitpos == 35 && (byte & 0x70) != 0)
- {
- /* The last byte was at bitpos=28, so only bottom 4 bits fit. */
- PB_RETURN_ERROR(stream, "varint overflow");
- }
- }
-
- *dest = result;
- return true;
- }
-
- bool checkreturn pb_decode_varint32(pb_istream_t *stream, uint32_t *dest)
- {
- return pb_decode_varint32_eof(stream, dest, NULL);
- }
-
- #ifndef PB_WITHOUT_64BIT
- bool checkreturn pb_decode_varint(pb_istream_t *stream, uint64_t *dest)
- {
- pb_byte_t byte;
- uint_fast8_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 = (uint_fast8_t)(bitpos + 7);
- } while (byte & 0x80);
-
- *dest = result;
- return true;
- }
- #endif
-
- bool checkreturn pb_skip_varint(pb_istream_t *stream)
- {
- pb_byte_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_eof(stream, &temp, eof))
- {
- 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, pb_byte_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);
-
- case PB_WT_STRING:
- /* Calling read_raw_value with a PB_WT_STRING is an error.
- * Explicitly handle this case and fallthrough to default to avoid
- * compiler warnings.
- */
-
- 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;
- }
-
- bool checkreturn pb_close_string_substream(pb_istream_t *stream, pb_istream_t *substream)
- {
- if (substream->bytes_left) {
- if (!pb_read(substream, NULL, substream->bytes_left))
- return false;
- }
-
- stream->state = substream->state;
-
- #ifndef PB_NO_ERRMSG
- stream->errmsg = substream->errmsg;
- #endif
- return true;
- }
-
- /*************************
- * Decode a single field *
- *************************/
-
- static bool checkreturn decode_static_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_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:
- if (iter->pSize != iter->pData)
- *(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;
- pb_size_t *size = (pb_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 = (char*)iter->pData + iter->pos->data_size * (*size);
- if (!func(&substream, iter->pos, pItem))
- {
- status = false;
- break;
- }
- (*size)++;
- }
-
- if (substream.bytes_left != 0)
- PB_RETURN_ERROR(stream, "array overflow");
- if (!pb_close_string_substream(stream, &substream))
- return false;
-
- return status;
- }
- else
- {
- /* Repeated field */
- pb_size_t *size = (pb_size_t*)iter->pSize;
- char *pItem = (char*)iter->pData + iter->pos->data_size * (*size);
-
- if ((*size)++ >= iter->pos->array_size)
- PB_RETURN_ERROR(stream, "array overflow");
-
- return func(stream, iter->pos, pItem);
- }
-
- case PB_HTYPE_ONEOF:
- *(pb_size_t*)iter->pSize = iter->pos->tag;
- if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
- {
- /* We memset to zero so that any callbacks are set to NULL.
- * Then set any default values. */
- memset(iter->pData, 0, iter->pos->data_size);
- pb_message_set_to_defaults((const pb_field_t*)iter->pos->ptr, iter->pData);
- }
- return func(stream, iter->pos, iter->pData);
-
- 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.
- * Zero size is not allowed, use pb_free() for releasing.
- */
- static bool checkreturn allocate_field(pb_istream_t *stream, void *pData, size_t data_size, size_t array_size)
- {
- void *ptr = *(void**)pData;
-
- if (data_size == 0 || array_size == 0)
- PB_RETURN_ERROR(stream, "invalid size");
-
- /* Check for multiplication overflows.
- * This code avoids the costly division if the sizes are small enough.
- * Multiplication is safe as long as only half of bits are set
- * in either multiplicand.
- */
- {
- const size_t check_limit = (size_t)1 << (sizeof(size_t) * 4);
- if (data_size >= check_limit || array_size >= check_limit)
- {
- const size_t size_max = (size_t)-1;
- if (size_max / array_size < data_size)
- {
- PB_RETURN_ERROR(stream, "size too large");
- }
- }
- }
-
- /* 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, array_size * data_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_iter_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)
- {
- /* We memset to zero so that any callbacks are set to NULL.
- * Then set any default values. */
- memset(pItem, 0, iter->pos->data_size);
- 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_iter_t *iter)
- {
- #ifndef PB_ENABLE_MALLOC
- PB_UNUSED(wire_type);
- PB_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:
- case PB_HTYPE_ONEOF:
- if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE &&
- *(void**)iter->pData != NULL)
- {
- /* Duplicate field, have to release the old allocation first. */
- pb_release_single_field(iter);
- }
-
- if (PB_HTYPE(type) == PB_HTYPE_ONEOF)
- {
- *(pb_size_t*)iter->pSize = iter->pos->tag;
- }
-
- if (PB_LTYPE(type) == PB_LTYPE_STRING ||
- PB_LTYPE(type) == PB_LTYPE_BYTES)
- {
- return func(stream, iter->pos, iter->pData);
- }
- else
- {
- if (!allocate_field(stream, iter->pData, iter->pos->data_size, 1))
- return false;
-
- initialize_pointer_field(*(void**)iter->pData, iter);
- return func(stream, iter->pos, *(void**)iter->pData);
- }
-
- case PB_HTYPE_REPEATED:
- if (wire_type == PB_WT_STRING
- && PB_LTYPE(type) <= PB_LTYPE_LAST_PACKABLE)
- {
- /* Packed array, multiple items come in at once. */
- bool status = true;
- pb_size_t *size = (pb_size_t*)iter->pSize;
- size_t allocated_size = *size;
- void *pItem;
- pb_istream_t substream;
-
- if (!pb_make_string_substream(stream, &substream))
- return false;
-
- while (substream.bytes_left)
- {
- if ((size_t)*size + 1 > allocated_size)
- {
- /* Allocate more storage. This tries to guess the
- * number of remaining entries. Round the division
- * upwards. */
- allocated_size += (substream.bytes_left - 1) / iter->pos->data_size + 1;
-
- if (!allocate_field(&substream, iter->pData, iter->pos->data_size, allocated_size))
- {
- status = false;
- break;
- }
- }
-
- /* Decode the array entry */
- pItem = *(char**)iter->pData + iter->pos->data_size * (*size);
- initialize_pointer_field(pItem, iter);
- if (!func(&substream, iter->pos, pItem))
- {
- status = false;
- break;
- }
-
- if (*size == PB_SIZE_MAX)
- {
- #ifndef PB_NO_ERRMSG
- stream->errmsg = "too many array entries";
- #endif
- status = false;
- break;
- }
-
- (*size)++;
- }
- if (!pb_close_string_substream(stream, &substream))
- return false;
-
- return status;
- }
- else
- {
- /* Normal repeated field, i.e. only one item at a time. */
- pb_size_t *size = (pb_size_t*)iter->pSize;
- void *pItem;
-
- if (*size == PB_SIZE_MAX)
- PB_RETURN_ERROR(stream, "too many array entries");
-
- (*size)++;
- if (!allocate_field(stream, iter->pData, iter->pos->data_size, *size))
- return false;
-
- pItem = *(char**)iter->pData + iter->pos->data_size * (*size - 1);
- initialize_pointer_field(pItem, iter);
- return func(stream, iter->pos, pItem);
- }
-
- default:
- PB_RETURN_ERROR(stream, "invalid field type");
- }
- #endif
- }
-
- static bool checkreturn decode_callback_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
- {
- pb_callback_t *pCallback = (pb_callback_t*)iter->pData;
-
- #ifdef PB_OLD_CALLBACK_STYLE
- void *arg = pCallback->arg;
- #else
- void **arg = &(pCallback->arg);
- #endif
-
- if (pCallback == NULL || 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);
-
- if (!pb_close_string_substream(stream, &substream))
- return false;
-
- return true;
- }
- else
- {
- /* Copy the single scalar value to stack.
- * This is required so that we can limit the stream length,
- * which in turn allows to use same callback for packed and
- * not-packed fields. */
- pb_istream_t substream;
- pb_byte_t buffer[10];
- size_t size = sizeof(buffer);
-
- if (!read_raw_value(stream, wire_type, buffer, &size))
- return false;
- substream = pb_istream_from_buffer(buffer, size);
-
- return pCallback->funcs.decode(&substream, iter->pos, arg);
- }
- }
-
- static bool checkreturn decode_field(pb_istream_t *stream, pb_wire_type_t wire_type, pb_field_iter_t *iter)
- {
- #ifdef PB_ENABLE_MALLOC
- /* When decoding an oneof field, check if there is old data that must be
- * released first. */
- if (PB_HTYPE(iter->pos->type) == PB_HTYPE_ONEOF)
- {
- if (!pb_release_union_field(stream, iter))
- return false;
- }
- #endif
-
- switch (PB_ATYPE(iter->pos->type))
- {
- case PB_ATYPE_STATIC:
- return decode_static_field(stream, wire_type, iter);
-
- case PB_ATYPE_POINTER:
- return decode_pointer_field(stream, wire_type, iter);
-
- case PB_ATYPE_CALLBACK:
- return decode_callback_field(stream, wire_type, iter);
-
- default:
- PB_RETURN_ERROR(stream, "invalid field type");
- }
- }
-
- static void iter_from_extension(pb_field_iter_t *iter, pb_extension_t *extension)
- {
- /* Fake a field iterator for the extension field.
- * It is not actually safe to advance this iterator, but decode_field
- * will not even try to. */
- const pb_field_t *field = (const pb_field_t*)extension->type->arg;
- (void)pb_field_iter_begin(iter, field, extension->dest);
- iter->pData = extension->dest;
- iter->pSize = &extension->found;
-
- if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
- {
- /* For pointer extensions, the pointer is stored directly
- * in the extension structure. This avoids having an extra
- * indirection. */
- iter->pData = &extension->dest;
- }
- }
-
- /* Default handler for extension fields. Expects a pb_field_t structure
- * in extension->type->arg. */
- static bool checkreturn default_extension_decoder(pb_istream_t *stream,
- pb_extension_t *extension, uint32_t tag, pb_wire_type_t wire_type)
- {
- const pb_field_t *field = (const pb_field_t*)extension->type->arg;
- pb_field_iter_t iter;
-
- if (field->tag != tag)
- return true;
-
- iter_from_extension(&iter, extension);
- extension->found = true;
- return decode_field(stream, wire_type, &iter);
- }
-
- /* Try to decode an unknown field as an extension field. Tries each extension
- * decoder in turn, until one of them handles the field or loop ends. */
- static bool checkreturn decode_extension(pb_istream_t *stream,
- uint32_t tag, pb_wire_type_t wire_type, pb_field_iter_t *iter)
- {
- pb_extension_t *extension = *(pb_extension_t* const *)iter->pData;
- size_t pos = stream->bytes_left;
-
- while (extension != NULL && pos == stream->bytes_left)
- {
- bool status;
- if (extension->type->decode)
- status = extension->type->decode(stream, extension, tag, wire_type);
- else
- status = default_extension_decoder(stream, extension, tag, wire_type);
-
- if (!status)
- return false;
-
- extension = extension->next;
- }
-
- return true;
- }
-
- /* Step through the iterator until an extension field is found or until all
- * entries have been checked. There can be only one extension field per
- * message. Returns false if no extension field is found. */
- static bool checkreturn find_extension_field(pb_field_iter_t *iter)
- {
- const pb_field_t *start = iter->pos;
-
- do {
- if (PB_LTYPE(iter->pos->type) == PB_LTYPE_EXTENSION)
- return true;
- (void)pb_field_iter_next(iter);
- } while (iter->pos != start);
-
- return false;
- }
-
- /* Initialize message fields to default values, recursively */
- static void pb_field_set_to_default(pb_field_iter_t *iter)
- {
- pb_type_t type;
- type = iter->pos->type;
-
- if (PB_LTYPE(type) == PB_LTYPE_EXTENSION)
- {
- pb_extension_t *ext = *(pb_extension_t* const *)iter->pData;
- while (ext != NULL)
- {
- pb_field_iter_t ext_iter;
- ext->found = false;
- iter_from_extension(&ext_iter, ext);
- pb_field_set_to_default(&ext_iter);
- ext = ext->next;
- }
- }
- else if (PB_ATYPE(type) == PB_ATYPE_STATIC)
- {
- bool init_data = true;
- if (PB_HTYPE(type) == PB_HTYPE_OPTIONAL && iter->pSize != iter->pData)
- {
- /* Set has_field to false. Still initialize the optional field
- * itself also. */
- *(bool*)iter->pSize = false;
- }
- else if (PB_HTYPE(type) == PB_HTYPE_REPEATED ||
- PB_HTYPE(type) == PB_HTYPE_ONEOF)
- {
- /* REPEATED: Set array count to 0, no need to initialize contents.
- ONEOF: Set which_field to 0. */
- *(pb_size_t*)iter->pSize = 0;
- init_data = false;
- }
-
- if (init_data)
- {
- if (PB_LTYPE(iter->pos->type) == PB_LTYPE_SUBMESSAGE)
- {
- /* Initialize submessage to defaults */
- pb_message_set_to_defaults((const pb_field_t *) iter->pos->ptr, iter->pData);
- }
- else if (iter->pos->ptr != NULL)
- {
- /* Initialize to default value */
- memcpy(iter->pData, iter->pos->ptr, iter->pos->data_size);
- }
- else
- {
- /* Initialize to zeros */
- memset(iter->pData, 0, iter->pos->data_size);
- }
- }
- }
- else if (PB_ATYPE(type) == PB_ATYPE_POINTER)
- {
- /* Initialize the pointer to NULL. */
- *(void**)iter->pData = NULL;
-
- /* Initialize array count to 0. */
- if (PB_HTYPE(type) == PB_HTYPE_REPEATED ||
- PB_HTYPE(type) == PB_HTYPE_ONEOF)
- {
- *(pb_size_t*)iter->pSize = 0;
- }
- }
- else if (PB_ATYPE(type) == PB_ATYPE_CALLBACK)
- {
- /* Don't overwrite callback */
- }
- }
-
- static void pb_message_set_to_defaults(const pb_field_t fields[], void *dest_struct)
- {
- pb_field_iter_t iter;
-
- if (!pb_field_iter_begin(&iter, fields, dest_struct))
- return; /* Empty message type */
-
- do
- {
- pb_field_set_to_default(&iter);
- } while (pb_field_iter_next(&iter));
- }
-
- /*********************
- * Decode all fields *
- *********************/
-
- bool checkreturn pb_decode_noinit(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
- {
- uint32_t fields_seen[(PB_MAX_REQUIRED_FIELDS + 31) / 32] = {0, 0};
- const uint32_t allbits = ~(uint32_t)0;
- uint32_t extension_range_start = 0;
- pb_field_iter_t iter;
-
- /* 'fixed_count_field' and 'fixed_count_size' track position of a repeated fixed
- * count field. This can only handle _one_ repeated fixed count field that
- * is unpacked and unordered among other (non repeated fixed count) fields.
- */
- const pb_field_t *fixed_count_field = NULL;
- pb_size_t fixed_count_size = 0;
-
- /* Return value ignored, as empty message types will be correctly handled by
- * pb_field_iter_find() anyway. */
- (void)pb_field_iter_begin(&iter, fields, dest_struct);
-
- while (stream->bytes_left)
- {
- uint32_t tag;
- pb_wire_type_t wire_type;
- bool eof;
-
- if (!pb_decode_tag(stream, &wire_type, &tag, &eof))
- {
- if (eof)
- break;
- else
- return false;
- }
-
- if (!pb_field_iter_find(&iter, tag))
- {
- /* No match found, check if it matches an extension. */
- if (tag >= extension_range_start)
- {
- if (!find_extension_field(&iter))
- extension_range_start = (uint32_t)-1;
- else
- extension_range_start = iter.pos->tag;
-
- if (tag >= extension_range_start)
- {
- size_t pos = stream->bytes_left;
-
- if (!decode_extension(stream, tag, wire_type, &iter))
- return false;
-
- if (pos != stream->bytes_left)
- {
- /* The field was handled */
- continue;
- }
- }
- }
-
- /* No match found, skip data */
- if (!pb_skip_field(stream, wire_type))
- return false;
- continue;
- }
-
- /* If a repeated fixed count field was found, get size from
- * 'fixed_count_field' as there is no counter contained in the struct.
- */
- if (PB_HTYPE(iter.pos->type) == PB_HTYPE_REPEATED
- && iter.pSize == iter.pData)
- {
- if (fixed_count_field != iter.pos) {
- /* If the new fixed count field does not match the previous one,
- * check that the previous one is NULL or that it finished
- * receiving all the expected data.
- */
- if (fixed_count_field != NULL &&
- fixed_count_size != fixed_count_field->array_size)
- {
- PB_RETURN_ERROR(stream, "wrong size for fixed count field");
- }
-
- fixed_count_field = iter.pos;
- fixed_count_size = 0;
- }
-
- iter.pSize = &fixed_count_size;
- }
-
- if (PB_HTYPE(iter.pos->type) == PB_HTYPE_REQUIRED
- && iter.required_field_index < PB_MAX_REQUIRED_FIELDS)
- {
- uint32_t tmp = ((uint32_t)1 << (iter.required_field_index & 31));
- fields_seen[iter.required_field_index >> 5] |= tmp;
- }
-
- if (!decode_field(stream, wire_type, &iter))
- return false;
- }
-
- /* Check that all elements of the last decoded fixed count field were present. */
- if (fixed_count_field != NULL &&
- fixed_count_size != fixed_count_field->array_size)
- {
- PB_RETURN_ERROR(stream, "wrong size for fixed count field");
- }
-
- /* Check that all required fields were present. */
- {
- /* First figure out the number of required fields by
- * seeking to the end of the field array. Usually we
- * are already close to end after decoding.
- */
- unsigned req_field_count;
- pb_type_t last_type;
- unsigned i;
- do {
- req_field_count = iter.required_field_index;
- last_type = iter.pos->type;
- } while (pb_field_iter_next(&iter));
-
- /* Fixup if last field was also required. */
- if (PB_HTYPE(last_type) == PB_HTYPE_REQUIRED && iter.pos->tag != 0)
- req_field_count++;
-
- if (req_field_count > PB_MAX_REQUIRED_FIELDS)
- req_field_count = PB_MAX_REQUIRED_FIELDS;
-
- if (req_field_count > 0)
- {
- /* Check the whole words */
- for (i = 0; i < (req_field_count >> 5); i++)
- {
- if (fields_seen[i] != allbits)
- PB_RETURN_ERROR(stream, "missing required field");
- }
-
- /* Check the remaining bits (if any) */
- if ((req_field_count & 31) != 0)
- {
- if (fields_seen[req_field_count >> 5] !=
- (allbits >> (32 - (req_field_count & 31))))
- {
- PB_RETURN_ERROR(stream, "missing required field");
- }
- }
- }
- }
-
- return true;
- }
-
- bool checkreturn pb_decode(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
- {
- bool status;
- pb_message_set_to_defaults(fields, dest_struct);
- status = pb_decode_noinit(stream, fields, dest_struct);
-
- #ifdef PB_ENABLE_MALLOC
- if (!status)
- pb_release(fields, dest_struct);
- #endif
-
- return status;
- }
-
- bool pb_decode_delimited_noinit(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_noinit(&substream, fields, dest_struct);
-
- if (!pb_close_string_substream(stream, &substream))
- return false;
- 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);
-
- if (!pb_close_string_substream(stream, &substream))
- return false;
- return status;
- }
-
- bool pb_decode_nullterminated(pb_istream_t *stream, const pb_field_t fields[], void *dest_struct)
- {
- /* This behaviour will be separated in nanopb-0.4.0, see issue #278. */
- return pb_decode(stream, fields, dest_struct);
- }
-
- #ifdef PB_ENABLE_MALLOC
- /* Given an oneof field, if there has already been a field inside this oneof,
- * release it before overwriting with a different one. */
- static bool pb_release_union_field(pb_istream_t *stream, pb_field_iter_t *iter)
- {
- pb_size_t old_tag = *(pb_size_t*)iter->pSize; /* Previous which_ value */
- pb_size_t new_tag = iter->pos->tag; /* New which_ value */
-
- if (old_tag == 0)
- return true; /* Ok, no old data in union */
-
- if (old_tag == new_tag)
- return true; /* Ok, old data is of same type => merge */
-
- /* Release old data. The find can fail if the message struct contains
- * invalid data. */
- if (!pb_field_iter_find(iter, old_tag))
- PB_RETURN_ERROR(stream, "invalid union tag");
-
- pb_release_single_field(iter);
-
- /* Restore iterator to where it should be.
- * This shouldn't fail unless the pb_field_t structure is corrupted. */
- if (!pb_field_iter_find(iter, new_tag))
- PB_RETURN_ERROR(stream, "iterator error");
-
- return true;
- }
-
- static void pb_release_single_field(const pb_field_iter_t *iter)
- {
- pb_type_t type;
- type = iter->pos->type;
-
- if (PB_HTYPE(type) == PB_HTYPE_ONEOF)
- {
- if (*(pb_size_t*)iter->pSize != iter->pos->tag)
- return; /* This is not the current field in the union */
- }
-
- /* Release anything contained inside an extension or submsg.
- * This has to be done even if the submsg itself is statically
- * allocated. */
- if (PB_LTYPE(type) == PB_LTYPE_EXTENSION)
- {
- /* Release fields from all extensions in the linked list */
- pb_extension_t *ext = *(pb_extension_t**)iter->pData;
- while (ext != NULL)
- {
- pb_field_iter_t ext_iter;
- iter_from_extension(&ext_iter, ext);
- pb_release_single_field(&ext_iter);
- ext = ext->next;
- }
- }
- else if (PB_LTYPE(type) == PB_LTYPE_SUBMESSAGE)
- {
- /* Release fields in submessage or submsg array */
- void *pItem = iter->pData;
- pb_size_t count = 1;
-
- if (PB_ATYPE(type) == PB_ATYPE_POINTER)
- {
- pItem = *(void**)iter->pData;
- }
-
- if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
- {
- if (PB_ATYPE(type) == PB_ATYPE_STATIC && iter->pSize == iter->pData) {
- /* No _count field so use size of the array */
- count = iter->pos->array_size;
- } else {
- count = *(pb_size_t*)iter->pSize;
- }
-
- if (PB_ATYPE(type) == PB_ATYPE_STATIC && count > iter->pos->array_size)
- {
- /* Protect against corrupted _count fields */
- count = iter->pos->array_size;
- }
- }
-
- if (pItem)
- {
- while (count--)
- {
- pb_release((const pb_field_t*)iter->pos->ptr, pItem);
- pItem = (char*)pItem + iter->pos->data_size;
- }
- }
- }
-
- if (PB_ATYPE(type) == PB_ATYPE_POINTER)
- {
- if (PB_HTYPE(type) == PB_HTYPE_REPEATED &&
- (PB_LTYPE(type) == PB_LTYPE_STRING ||
- PB_LTYPE(type) == PB_LTYPE_BYTES))
- {
- /* Release entries in repeated string or bytes array */
- void **pItem = *(void***)iter->pData;
- pb_size_t count = *(pb_size_t*)iter->pSize;
- while (count--)
- {
- pb_free(*pItem);
- *pItem++ = NULL;
- }
- }
-
- if (PB_HTYPE(type) == PB_HTYPE_REPEATED)
- {
- /* We are going to release the array, so set the size to 0 */
- *(pb_size_t*)iter->pSize = 0;
- }
-
- /* Release main item */
- pb_free(*(void**)iter->pData);
- *(void**)iter->pData = NULL;
- }
- }
-
- void pb_release(const pb_field_t fields[], void *dest_struct)
- {
- pb_field_iter_t iter;
-
- if (!dest_struct)
- return; /* Ignore NULL pointers, similar to free() */
-
- if (!pb_field_iter_begin(&iter, fields, dest_struct))
- return; /* Empty message type */
-
- do
- {
- pb_release_single_field(&iter);
- } while (pb_field_iter_next(&iter));
- }
- #endif
-
- /* Field decoders */
-
- bool pb_decode_svarint(pb_istream_t *stream, pb_int64_t *dest)
- {
- pb_uint64_t value;
- if (!pb_decode_varint(stream, &value))
- return false;
-
- if (value & 1)
- *dest = (pb_int64_t)(~(value >> 1));
- else
- *dest = (pb_int64_t)(value >> 1);
-
- return true;
- }
-
- bool pb_decode_fixed32(pb_istream_t *stream, void *dest)
- {
- pb_byte_t bytes[4];
-
- if (!pb_read(stream, bytes, 4))
- return false;
-
- *(uint32_t*)dest = ((uint32_t)bytes[0] << 0) |
- ((uint32_t)bytes[1] << 8) |
- ((uint32_t)bytes[2] << 16) |
- ((uint32_t)bytes[3] << 24);
- return true;
- }
-
- #ifndef PB_WITHOUT_64BIT
- bool pb_decode_fixed64(pb_istream_t *stream, void *dest)
- {
- pb_byte_t bytes[8];
-
- if (!pb_read(stream, bytes, 8))
- return false;
-
- *(uint64_t*)dest = ((uint64_t)bytes[0] << 0) |
- ((uint64_t)bytes[1] << 8) |
- ((uint64_t)bytes[2] << 16) |
- ((uint64_t)bytes[3] << 24) |
- ((uint64_t)bytes[4] << 32) |
- ((uint64_t)bytes[5] << 40) |
- ((uint64_t)bytes[6] << 48) |
- ((uint64_t)bytes[7] << 56);
-
- return true;
- }
- #endif
-
- static bool checkreturn pb_dec_varint(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- pb_uint64_t value;
- pb_int64_t svalue;
- pb_int64_t clamped;
- if (!pb_decode_varint(stream, &value))
- return false;
-
- /* See issue 97: Google's C++ protobuf allows negative varint values to
- * be cast as int32_t, instead of the int64_t that should be used when
- * encoding. Previous nanopb versions had a bug in encoding. In order to
- * not break decoding of such messages, we cast <=32 bit fields to
- * int32_t first to get the sign correct.
- */
- if (field->data_size == sizeof(pb_int64_t))
- svalue = (pb_int64_t)value;
- else
- svalue = (int32_t)value;
-
- /* Cast to the proper field size, while checking for overflows */
- if (field->data_size == sizeof(pb_int64_t))
- clamped = *(pb_int64_t*)dest = svalue;
- else if (field->data_size == sizeof(int32_t))
- clamped = *(int32_t*)dest = (int32_t)svalue;
- else if (field->data_size == sizeof(int_least16_t))
- clamped = *(int_least16_t*)dest = (int_least16_t)svalue;
- else if (field->data_size == sizeof(int_least8_t))
- clamped = *(int_least8_t*)dest = (int_least8_t)svalue;
- else
- PB_RETURN_ERROR(stream, "invalid data_size");
-
- if (clamped != svalue)
- PB_RETURN_ERROR(stream, "integer too large");
-
- return true;
- }
-
- static bool checkreturn pb_dec_uvarint(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- pb_uint64_t value, clamped;
- if (!pb_decode_varint(stream, &value))
- return false;
-
- /* Cast to the proper field size, while checking for overflows */
- if (field->data_size == sizeof(pb_uint64_t))
- clamped = *(pb_uint64_t*)dest = value;
- else if (field->data_size == sizeof(uint32_t))
- clamped = *(uint32_t*)dest = (uint32_t)value;
- else if (field->data_size == sizeof(uint_least16_t))
- clamped = *(uint_least16_t*)dest = (uint_least16_t)value;
- else if (field->data_size == sizeof(uint_least8_t))
- clamped = *(uint_least8_t*)dest = (uint_least8_t)value;
- else
- PB_RETURN_ERROR(stream, "invalid data_size");
-
- if (clamped != value)
- PB_RETURN_ERROR(stream, "integer too large");
-
- return true;
- }
-
- static bool checkreturn pb_dec_svarint(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- pb_int64_t value, clamped;
- if (!pb_decode_svarint(stream, &value))
- return false;
-
- /* Cast to the proper field size, while checking for overflows */
- if (field->data_size == sizeof(pb_int64_t))
- clamped = *(pb_int64_t*)dest = value;
- else if (field->data_size == sizeof(int32_t))
- clamped = *(int32_t*)dest = (int32_t)value;
- else if (field->data_size == sizeof(int_least16_t))
- clamped = *(int_least16_t*)dest = (int_least16_t)value;
- else if (field->data_size == sizeof(int_least8_t))
- clamped = *(int_least8_t*)dest = (int_least8_t)value;
- else
- PB_RETURN_ERROR(stream, "invalid data_size");
-
- if (clamped != value)
- PB_RETURN_ERROR(stream, "integer too large");
-
- return true;
- }
-
- static bool checkreturn pb_dec_fixed32(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- PB_UNUSED(field);
- return pb_decode_fixed32(stream, dest);
- }
-
- static bool checkreturn pb_dec_fixed64(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- PB_UNUSED(field);
- #ifndef PB_WITHOUT_64BIT
- return pb_decode_fixed64(stream, dest);
- #else
- PB_UNUSED(dest);
- PB_RETURN_ERROR(stream, "no 64bit support");
- #endif
- }
-
- static bool checkreturn pb_dec_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- uint32_t size;
- size_t alloc_size;
- pb_bytes_array_t *bdest;
-
- if (!pb_decode_varint32(stream, &size))
- return false;
-
- if (size > PB_SIZE_MAX)
- PB_RETURN_ERROR(stream, "bytes overflow");
-
- alloc_size = PB_BYTES_ARRAY_T_ALLOCSIZE(size);
- if (size > alloc_size)
- PB_RETURN_ERROR(stream, "size too large");
-
- if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
- {
- #ifndef PB_ENABLE_MALLOC
- PB_RETURN_ERROR(stream, "no malloc support");
- #else
- if (!allocate_field(stream, dest, alloc_size, 1))
- return false;
- bdest = *(pb_bytes_array_t**)dest;
- #endif
- }
- else
- {
- if (alloc_size > field->data_size)
- PB_RETURN_ERROR(stream, "bytes overflow");
- bdest = (pb_bytes_array_t*)dest;
- }
-
- bdest->size = (pb_size_t)size;
- return pb_read(stream, bdest->bytes, size);
- }
-
- static bool checkreturn pb_dec_string(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- uint32_t size;
- size_t alloc_size;
- bool status;
- if (!pb_decode_varint32(stream, &size))
- return false;
-
- /* Space for null terminator */
- alloc_size = size + 1;
-
- if (alloc_size < size)
- PB_RETURN_ERROR(stream, "size too large");
-
- if (PB_ATYPE(field->type) == PB_ATYPE_POINTER)
- {
- #ifndef PB_ENABLE_MALLOC
- PB_RETURN_ERROR(stream, "no malloc support");
- #else
- if (!allocate_field(stream, dest, alloc_size, 1))
- return false;
- dest = *(void**)dest;
- #endif
- }
- else
- {
- if (alloc_size > field->data_size)
- PB_RETURN_ERROR(stream, "string overflow");
- }
-
- status = pb_read(stream, (pb_byte_t*)dest, size);
- *((pb_byte_t*)dest + size) = 0;
- return status;
- }
-
- static bool checkreturn pb_dec_submessage(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- bool status;
- pb_istream_t substream;
- const pb_field_t* submsg_fields = (const pb_field_t*)field->ptr;
-
- if (!pb_make_string_substream(stream, &substream))
- return false;
-
- if (field->ptr == NULL)
- PB_RETURN_ERROR(stream, "invalid field descriptor");
-
- /* New array entries need to be initialized, while required and optional
- * submessages have already been initialized in the top-level pb_decode. */
- if (PB_HTYPE(field->type) == PB_HTYPE_REPEATED)
- status = pb_decode(&substream, submsg_fields, dest);
- else
- status = pb_decode_noinit(&substream, submsg_fields, dest);
-
- if (!pb_close_string_substream(stream, &substream))
- return false;
- return status;
- }
-
- static bool checkreturn pb_dec_fixed_length_bytes(pb_istream_t *stream, const pb_field_t *field, void *dest)
- {
- uint32_t size;
-
- if (!pb_decode_varint32(stream, &size))
- return false;
-
- if (size > PB_SIZE_MAX)
- PB_RETURN_ERROR(stream, "bytes overflow");
-
- if (size == 0)
- {
- /* As a special case, treat empty bytes string as all zeros for fixed_length_bytes. */
- memset(dest, 0, field->data_size);
- return true;
- }
-
- if (size != field->data_size)
- PB_RETURN_ERROR(stream, "incorrect fixed length bytes size");
-
- return pb_read(stream, (pb_byte_t*)dest, field->data_size);
- }
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