mirror of
https://github.com/Lurkars/esp-ena.git
synced 2024-11-01 19:14:37 +01:00
346 lines
10 KiB
C
346 lines
10 KiB
C
/* pb_common.c: Common support functions for pb_encode.c and pb_decode.c.
|
|
*
|
|
* 2014 Petteri Aimonen <jpa@kapsi.fi>
|
|
*/
|
|
|
|
#include "pb_common.h"
|
|
|
|
static bool load_descriptor_values(pb_field_iter_t *iter)
|
|
{
|
|
uint32_t word0;
|
|
uint32_t data_offset;
|
|
uint_least8_t format;
|
|
int_least8_t size_offset;
|
|
|
|
if (iter->index >= iter->descriptor->field_count)
|
|
return false;
|
|
|
|
word0 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index]);
|
|
format = word0 & 3;
|
|
iter->tag = (pb_size_t)((word0 >> 2) & 0x3F);
|
|
iter->type = (pb_type_t)((word0 >> 8) & 0xFF);
|
|
|
|
if (format == 0)
|
|
{
|
|
/* 1-word format */
|
|
iter->array_size = 1;
|
|
size_offset = (int_least8_t)((word0 >> 24) & 0x0F);
|
|
data_offset = (word0 >> 16) & 0xFF;
|
|
iter->data_size = (pb_size_t)((word0 >> 28) & 0x0F);
|
|
}
|
|
else if (format == 1)
|
|
{
|
|
/* 2-word format */
|
|
uint32_t word1 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 1]);
|
|
|
|
iter->array_size = (pb_size_t)((word0 >> 16) & 0x0FFF);
|
|
iter->tag = (pb_size_t)(iter->tag | ((word1 >> 28) << 6));
|
|
size_offset = (int_least8_t)((word0 >> 28) & 0x0F);
|
|
data_offset = word1 & 0xFFFF;
|
|
iter->data_size = (pb_size_t)((word1 >> 16) & 0x0FFF);
|
|
}
|
|
else if (format == 2)
|
|
{
|
|
/* 4-word format */
|
|
uint32_t word1 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 1]);
|
|
uint32_t word2 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 2]);
|
|
uint32_t word3 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 3]);
|
|
|
|
iter->array_size = (pb_size_t)(word0 >> 16);
|
|
iter->tag = (pb_size_t)(iter->tag | ((word1 >> 8) << 6));
|
|
size_offset = (int_least8_t)(word1 & 0xFF);
|
|
data_offset = word2;
|
|
iter->data_size = (pb_size_t)word3;
|
|
}
|
|
else
|
|
{
|
|
/* 8-word format */
|
|
uint32_t word1 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 1]);
|
|
uint32_t word2 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 2]);
|
|
uint32_t word3 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 3]);
|
|
uint32_t word4 = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index + 4]);
|
|
|
|
iter->array_size = (pb_size_t)word4;
|
|
iter->tag = (pb_size_t)(iter->tag | ((word1 >> 8) << 6));
|
|
size_offset = (int_least8_t)(word1 & 0xFF);
|
|
data_offset = word2;
|
|
iter->data_size = (pb_size_t)word3;
|
|
}
|
|
|
|
if (!iter->message)
|
|
{
|
|
/* Avoid doing arithmetic on null pointers, it is undefined */
|
|
iter->pField = NULL;
|
|
iter->pSize = NULL;
|
|
}
|
|
else
|
|
{
|
|
iter->pField = (char*)iter->message + data_offset;
|
|
|
|
if (size_offset)
|
|
{
|
|
iter->pSize = (char*)iter->pField - size_offset;
|
|
}
|
|
else if (PB_HTYPE(iter->type) == PB_HTYPE_REPEATED &&
|
|
(PB_ATYPE(iter->type) == PB_ATYPE_STATIC ||
|
|
PB_ATYPE(iter->type) == PB_ATYPE_POINTER))
|
|
{
|
|
/* Fixed count array */
|
|
iter->pSize = &iter->array_size;
|
|
}
|
|
else
|
|
{
|
|
iter->pSize = NULL;
|
|
}
|
|
|
|
if (PB_ATYPE(iter->type) == PB_ATYPE_POINTER && iter->pField != NULL)
|
|
{
|
|
iter->pData = *(void**)iter->pField;
|
|
}
|
|
else
|
|
{
|
|
iter->pData = iter->pField;
|
|
}
|
|
}
|
|
|
|
if (PB_LTYPE_IS_SUBMSG(iter->type))
|
|
{
|
|
iter->submsg_desc = iter->descriptor->submsg_info[iter->submessage_index];
|
|
}
|
|
else
|
|
{
|
|
iter->submsg_desc = NULL;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static void advance_iterator(pb_field_iter_t *iter)
|
|
{
|
|
iter->index++;
|
|
|
|
if (iter->index >= iter->descriptor->field_count)
|
|
{
|
|
/* Restart */
|
|
iter->index = 0;
|
|
iter->field_info_index = 0;
|
|
iter->submessage_index = 0;
|
|
iter->required_field_index = 0;
|
|
}
|
|
else
|
|
{
|
|
/* Increment indexes based on previous field type.
|
|
* All field info formats have the following fields:
|
|
* - lowest 2 bits tell the amount of words in the descriptor (2^n words)
|
|
* - bits 2..7 give the lowest bits of tag number.
|
|
* - bits 8..15 give the field type.
|
|
*/
|
|
uint32_t prev_descriptor = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index]);
|
|
pb_type_t prev_type = (prev_descriptor >> 8) & 0xFF;
|
|
pb_size_t descriptor_len = (pb_size_t)(1 << (prev_descriptor & 3));
|
|
|
|
iter->field_info_index = (pb_size_t)(iter->field_info_index + descriptor_len);
|
|
|
|
if (PB_HTYPE(prev_type) == PB_HTYPE_REQUIRED)
|
|
{
|
|
iter->required_field_index++;
|
|
}
|
|
|
|
if (PB_LTYPE_IS_SUBMSG(prev_type))
|
|
{
|
|
iter->submessage_index++;
|
|
}
|
|
}
|
|
}
|
|
|
|
bool pb_field_iter_begin(pb_field_iter_t *iter, const pb_msgdesc_t *desc, void *message)
|
|
{
|
|
memset(iter, 0, sizeof(*iter));
|
|
|
|
iter->descriptor = desc;
|
|
iter->message = message;
|
|
|
|
return load_descriptor_values(iter);
|
|
}
|
|
|
|
bool pb_field_iter_begin_extension(pb_field_iter_t *iter, pb_extension_t *extension)
|
|
{
|
|
const pb_msgdesc_t *msg = (const pb_msgdesc_t*)extension->type->arg;
|
|
bool status;
|
|
|
|
uint32_t word0 = PB_PROGMEM_READU32(msg->field_info[0]);
|
|
if (PB_ATYPE(word0 >> 8) == PB_ATYPE_POINTER)
|
|
{
|
|
/* For pointer extensions, the pointer is stored directly
|
|
* in the extension structure. This avoids having an extra
|
|
* indirection. */
|
|
status = pb_field_iter_begin(iter, msg, &extension->dest);
|
|
}
|
|
else
|
|
{
|
|
status = pb_field_iter_begin(iter, msg, extension->dest);
|
|
}
|
|
|
|
iter->pSize = &extension->found;
|
|
return status;
|
|
}
|
|
|
|
bool pb_field_iter_next(pb_field_iter_t *iter)
|
|
{
|
|
advance_iterator(iter);
|
|
(void)load_descriptor_values(iter);
|
|
return iter->index != 0;
|
|
}
|
|
|
|
bool pb_field_iter_find(pb_field_iter_t *iter, uint32_t tag)
|
|
{
|
|
if (iter->tag == tag)
|
|
{
|
|
return true; /* Nothing to do, correct field already. */
|
|
}
|
|
else
|
|
{
|
|
pb_size_t start = iter->index;
|
|
uint32_t fieldinfo;
|
|
|
|
do
|
|
{
|
|
/* Advance iterator but don't load values yet */
|
|
advance_iterator(iter);
|
|
|
|
/* Do fast check for tag number match */
|
|
fieldinfo = PB_PROGMEM_READU32(iter->descriptor->field_info[iter->field_info_index]);
|
|
|
|
if (((fieldinfo >> 2) & 0x3F) == (tag & 0x3F))
|
|
{
|
|
/* Good candidate, check further */
|
|
(void)load_descriptor_values(iter);
|
|
|
|
if (iter->tag == tag &&
|
|
PB_LTYPE(iter->type) != PB_LTYPE_EXTENSION)
|
|
{
|
|
/* Found it */
|
|
return true;
|
|
}
|
|
}
|
|
} while (iter->index != start);
|
|
|
|
/* Searched all the way back to start, and found nothing. */
|
|
(void)load_descriptor_values(iter);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
static void *pb_const_cast(const void *p)
|
|
{
|
|
/* Note: this casts away const, in order to use the common field iterator
|
|
* logic for both encoding and decoding. The cast is done using union
|
|
* to avoid spurious compiler warnings. */
|
|
union {
|
|
void *p1;
|
|
const void *p2;
|
|
} t;
|
|
t.p2 = p;
|
|
return t.p1;
|
|
}
|
|
|
|
bool pb_field_iter_begin_const(pb_field_iter_t *iter, const pb_msgdesc_t *desc, const void *message)
|
|
{
|
|
return pb_field_iter_begin(iter, desc, pb_const_cast(message));
|
|
}
|
|
|
|
bool pb_field_iter_begin_extension_const(pb_field_iter_t *iter, const pb_extension_t *extension)
|
|
{
|
|
return pb_field_iter_begin_extension(iter, (pb_extension_t*)pb_const_cast(extension));
|
|
}
|
|
|
|
bool pb_default_field_callback(pb_istream_t *istream, pb_ostream_t *ostream, const pb_field_t *field)
|
|
{
|
|
if (field->data_size == sizeof(pb_callback_t))
|
|
{
|
|
pb_callback_t *pCallback = (pb_callback_t*)field->pData;
|
|
|
|
if (pCallback != NULL)
|
|
{
|
|
if (istream != NULL && pCallback->funcs.decode != NULL)
|
|
{
|
|
return pCallback->funcs.decode(istream, field, &pCallback->arg);
|
|
}
|
|
|
|
if (ostream != NULL && pCallback->funcs.encode != NULL)
|
|
{
|
|
return pCallback->funcs.encode(ostream, field, &pCallback->arg);
|
|
}
|
|
}
|
|
}
|
|
|
|
return true; /* Success, but didn't do anything */
|
|
|
|
}
|
|
|
|
#ifdef PB_VALIDATE_UTF8
|
|
|
|
/* This function checks whether a string is valid UTF-8 text.
|
|
*
|
|
* Algorithm is adapted from https://www.cl.cam.ac.uk/~mgk25/ucs/utf8_check.c
|
|
* Original copyright: Markus Kuhn <http://www.cl.cam.ac.uk/~mgk25/> 2005-03-30
|
|
* Licensed under "Short code license", which allows use under MIT license or
|
|
* any compatible with it.
|
|
*/
|
|
|
|
bool pb_validate_utf8(const char *str)
|
|
{
|
|
const pb_byte_t *s = (const pb_byte_t*)str;
|
|
while (*s)
|
|
{
|
|
if (*s < 0x80)
|
|
{
|
|
/* 0xxxxxxx */
|
|
s++;
|
|
}
|
|
else if ((s[0] & 0xe0) == 0xc0)
|
|
{
|
|
/* 110XXXXx 10xxxxxx */
|
|
if ((s[1] & 0xc0) != 0x80 ||
|
|
(s[0] & 0xfe) == 0xc0) /* overlong? */
|
|
return false;
|
|
else
|
|
s += 2;
|
|
}
|
|
else if ((s[0] & 0xf0) == 0xe0)
|
|
{
|
|
/* 1110XXXX 10Xxxxxx 10xxxxxx */
|
|
if ((s[1] & 0xc0) != 0x80 ||
|
|
(s[2] & 0xc0) != 0x80 ||
|
|
(s[0] == 0xe0 && (s[1] & 0xe0) == 0x80) || /* overlong? */
|
|
(s[0] == 0xed && (s[1] & 0xe0) == 0xa0) || /* surrogate? */
|
|
(s[0] == 0xef && s[1] == 0xbf &&
|
|
(s[2] & 0xfe) == 0xbe)) /* U+FFFE or U+FFFF? */
|
|
return false;
|
|
else
|
|
s += 3;
|
|
}
|
|
else if ((s[0] & 0xf8) == 0xf0)
|
|
{
|
|
/* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
|
|
if ((s[1] & 0xc0) != 0x80 ||
|
|
(s[2] & 0xc0) != 0x80 ||
|
|
(s[3] & 0xc0) != 0x80 ||
|
|
(s[0] == 0xf0 && (s[1] & 0xf0) == 0x80) || /* overlong? */
|
|
(s[0] == 0xf4 && s[1] > 0x8f) || s[0] > 0xf4) /* > U+10FFFF? */
|
|
return false;
|
|
else
|
|
s += 4;
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#endif
|
|
|