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meshtastic-firmware/lib/nanopb/pb_encode.c

959 wiersze
28 KiB
C
Czysty Wina Historia

/* 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 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
/**************************************
* 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)
{
size_t i;
pb_byte_t *dest = (pb_byte_t*)stream->state;
stream->state = dest + count;
for (i = 0; i < count; i++)
dest[i] = buf[i];
return true;
}
pb_ostream_t pb_ostream_from_buffer(pb_byte_t *buf, size_t bufsize)
{
pb_ostream_t stream;
#ifdef PB_BUFFER_ONLY
stream.callback = (void*)1; /* Just a marker value */
#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->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;
}
/* Rest is proto3 singular fields */
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;
}
}
{
/* Catch-all branch that does byte-per-byte comparison for zero value.
*
* This is for all pointer fields, and for static PB_LTYPE_VARINT,
* UVARINT, SVARINT, FIXED32, FIXED64, EXTENSION fields, and also
* callback fields. These all have integer or pointer value which
* can be compared with 0.
*/
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;
}
}
/* 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;
if (value < 0)
zigzagged = ~((pb_uint64_t)value << 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)
{
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);
}
#ifndef PB_WITHOUT_64BIT
bool checkreturn pb_encode_fixed64(pb_ostream_t *stream, const void *value)
{
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
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 &&
PB_BYTES_ARRAY_T_ALLOCSIZE(bytes->size) > field->data_size)
{
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
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