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c75b4b70fc
To not bloat util.h or image.h the protobuf.h introduced to handle all PB needs. We represent our PB objects as pairs of records | 4 bytes for object packed size +--- | X bytes -- object itself v3: - Use plain read/write calls - Use local buffers for small objects v4: - Add pb_pksize helper to calculate object size with header Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
#ifndef PROTOBUF_H__
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#define PROTOBUF_H__
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#include "types.h"
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#include "compiler.h"
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#include "util.h"
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/*
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* ATTENTION
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*
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* This typdefs represent "generic" prototypes for
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* pack/unpack/getsize functions generated by PB
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* engine, thus (!!!) if PB engine change arguments
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* order or their number we may meet serious problems.
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*
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* FIXME
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*
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* Find a way to verify PB generated functions statemens
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* to match this typedefs.
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*/
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typedef size_t (pb_getpksize_t)(void *obj);
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typedef size_t (pb_pack_t)(void *obj, void *where);
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typedef void *(pb_unpack_t)(void *allocator, size_t size, void *from);
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extern int pb_read_object_with_header(int fd, void **pobj,
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pb_unpack_t *unpack,
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bool eof);
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#define pb_read(__fd, __obj_pptr, __proto_message_name) \
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pb_read_object_with_header(__fd, (void **)__obj_pptr, \
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(void *)&__proto_message_name ##__unpack, \
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false)
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#define pb_read_eof(__fd, __obj_pptr, __proto_message_name) \
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pb_read_object_with_header(__fd, (void **)__obj_pptr, \
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(void *)&__proto_message_name ##__unpack, \
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true)
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extern int pb_write_object_with_header(int fd, void *obj,
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pb_getpksize_t *getpksize,
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pb_pack_t *pack);
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#define pb_write(__fd, __obj, __proto_message_name) \
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pb_write_object_with_header(__fd, __obj, \
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(void *)&__proto_message_name ##__get_packed_size, \
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(void *)&__proto_message_name ##__pack)
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#define pb_pksize(__obj, __proto_message_name) \
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(__proto_message_name ##__get_packed_size(__obj) + sizeof(u32))
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#define pb_repeated_size(__obj, __member) \
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(sizeof(*(__obj)->__member) * (__obj)->n_ ##__member)
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#endif /* PROTOBUF_H__ */
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