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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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97 lines
2.9 KiB
97 lines
2.9 KiB
/* pb_common.c: Common support functions for pb_encode.c and pb_decode.c. |
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* |
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* 2014 Petteri Aimonen <jpa@kapsi.fi> |
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*/ |
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#include "pb_common.h" |
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bool pb_field_iter_begin(pb_field_iter_t *iter, const pb_field_t *fields, void *dest_struct) |
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{ |
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iter->start = fields; |
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iter->pos = fields; |
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iter->required_field_index = 0; |
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iter->dest_struct = dest_struct; |
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iter->pData = (char*)dest_struct + iter->pos->data_offset; |
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iter->pSize = (char*)iter->pData + iter->pos->size_offset; |
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return (iter->pos->tag != 0); |
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} |
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bool pb_field_iter_next(pb_field_iter_t *iter) |
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{ |
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const pb_field_t *prev_field = iter->pos; |
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if (prev_field->tag == 0) |
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{ |
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/* Handle empty message types, where the first field is already the terminator. |
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* In other cases, the iter->pos never points to the terminator. */ |
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return false; |
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} |
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iter->pos++; |
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if (iter->pos->tag == 0) |
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{ |
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/* Wrapped back to beginning, reinitialize */ |
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(void)pb_field_iter_begin(iter, iter->start, iter->dest_struct); |
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return false; |
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} |
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else |
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{ |
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/* Increment the pointers based on previous field size */ |
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size_t prev_size = prev_field->data_size; |
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if (PB_HTYPE(prev_field->type) == PB_HTYPE_ONEOF && |
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PB_HTYPE(iter->pos->type) == PB_HTYPE_ONEOF) |
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{ |
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/* Don't advance pointers inside unions */ |
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prev_size = 0; |
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iter->pData = (char*)iter->pData - prev_field->data_offset; |
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} |
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else if (PB_ATYPE(prev_field->type) == PB_ATYPE_STATIC && |
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PB_HTYPE(prev_field->type) == PB_HTYPE_REPEATED) |
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{ |
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/* In static arrays, the data_size tells the size of a single entry and |
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* array_size is the number of entries */ |
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prev_size *= prev_field->array_size; |
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} |
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else if (PB_ATYPE(prev_field->type) == PB_ATYPE_POINTER) |
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{ |
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/* Pointer fields always have a constant size in the main structure. |
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* The data_size only applies to the dynamically allocated area. */ |
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prev_size = sizeof(void*); |
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} |
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if (PB_HTYPE(prev_field->type) == PB_HTYPE_REQUIRED) |
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{ |
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/* Count the required fields, in order to check their presence in the |
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* decoder. */ |
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iter->required_field_index++; |
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} |
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iter->pData = (char*)iter->pData + prev_size + iter->pos->data_offset; |
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iter->pSize = (char*)iter->pData + iter->pos->size_offset; |
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return true; |
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} |
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} |
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bool pb_field_iter_find(pb_field_iter_t *iter, uint32_t tag) |
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{ |
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const pb_field_t *start = iter->pos; |
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do { |
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if (iter->pos->tag == tag && |
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PB_LTYPE(iter->pos->type) != PB_LTYPE_EXTENSION) |
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{ |
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/* Found the wanted field */ |
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return true; |
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} |
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(void)pb_field_iter_next(iter); |
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} while (iter->pos != start); |
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/* Searched all the way back to start, and found nothing. */ |
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return false; |
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} |
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