'''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
-import google.protobuf.descriptor_pb2 as descriptor
-import nanopb_pb2
+try:
+ import google.protobuf.descriptor_pb2 as descriptor
+except:
+ print
+ print "*************************************************************"
+ print "*** Could not import the Google protobuf Python libraries ***"
+ print "*** Try installing package 'python-protobuf' or similar. ***"
+ print "*************************************************************"
+ print
+ raise
+
+try:
+ import nanopb_pb2
+except:
+ print
+ print "***************************************************************"
+ print "*** Could not import the precompiled nanopb_pb2.py. ***"
+ print "*** Run 'make' in the 'generator' folder to update the file.***"
+ print "***************************************************************"
+ print
+ raise
+
import os.path
# Values are tuple (c type, pb ltype)
self.values = [(self.names + x.name, x.number) for x in desc.value]
def __str__(self):
- result = 'typedef enum {\n'
+ result = 'typedef enum _%s {\n' % self.names
result += ',\n'.join([" %s = %d" % x for x in self.values])
result += '\n} %s;' % self.names
return result
prev_field_name is the name of the previous field or None.
'''
result = ' {%d, ' % self.tag
- result += self.htype
+ result += '(pb_type_t) ((int) ' + self.htype
if self.ltype is not None:
- result += ' | ' + self.ltype
- result += ',\n'
+ result += ' | (int) ' + self.ltype
+ result += '),\n'
if prev_field_name is None:
result += ' offsetof(%s, %s),' % (self.struct_name, self.name)
result += '\n &%s_default}' % (self.struct_name + self.name)
return result
+
+ def largest_field_value(self):
+ '''Determine if this field needs 16bit or 32bit pb_field_t structure to compile properly.
+ Returns numeric value or a C-expression for assert.'''
+ if self.ltype == 'PB_LTYPE_SUBMESSAGE':
+ if self.htype == 'PB_HTYPE_ARRAY':
+ return 'pb_membersize(%s, %s[0])' % (self.struct_name, self.name)
+ else:
+ return 'pb_membersize(%s, %s)' % (self.struct_name, self.name)
+
+ return max(self.tag, self.max_size, self.max_count)
+
class Message:
def __init__(self, names, desc):
return [str(field.ctype) for field in self.fields]
def __str__(self):
- result = 'typedef struct {\n'
+ result = 'typedef struct _%s {\n' % self.name
result += '\n'.join([str(f) for f in self.ordered_fields])
result += '\n} %s;' % self.name
return result
'''
for k, v in data.items():
v.discard(k) # Ignore self dependencies
- extra_items_in_deps = reduce(set.union, data.values()) - set(data.keys())
+ extra_items_in_deps = reduce(set.union, data.values(), set()) - set(data.keys())
data.update(dict([(item, set()) for item in extra_items_in_deps]))
while True:
ordered = set(item for item,dep in data.items() if not dep)
if msgname in message_by_name:
yield message_by_name[msgname]
-def generate_header(headername, enums, messages):
+def generate_header(dependencies, headername, enums, messages):
'''Generate content for a header file.
Generates strings, which should be concatenated and stored to file.
'''
yield '#define _PB_%s_\n' % symbol
yield '#include <pb.h>\n\n'
+ for dependency in dependencies:
+ noext = os.path.splitext(dependency)[0]
+ yield '#include "%s.pb.h"\n' % noext
+ yield '\n'
+
yield '/* Enum definitions */\n'
for enum in enums:
yield str(enum) + '\n\n'
for msg in messages:
yield msg.fields_declaration() + '\n'
+ if messages:
+ count_required_fields = lambda m: len([f for f in msg.fields if f.htype == 'PB_HTYPE_REQUIRED'])
+ largest_msg = max(messages, key = count_required_fields)
+ largest_count = count_required_fields(largest_msg)
+ if largest_count > 64:
+ yield '\n/* Check that missing required fields will be properly detected */\n'
+ yield '#if PB_MAX_REQUIRED_FIELDS < %d\n' % largest_count
+ yield '#error Properly detecting missing required fields in %s requires \\\n' % largest_msg.name
+ yield ' setting PB_MAX_REQUIRED_FIELDS to %d or more.\n' % largest_count
+ yield '#endif\n'
+
+ worst = 0
+ worst_field = ''
+ checks = []
+ for msg in messages:
+ for field in msg.fields:
+ status = field.largest_field_value()
+ if isinstance(status, (str, unicode)):
+ checks.append(status)
+ elif status > worst:
+ worst = status
+ worst_field = str(field.struct_name) + '.' + str(field.name)
+
+ if worst > 255 or checks:
+ yield '\n/* Check that field information fits in pb_field_t */\n'
+
+ if worst < 65536:
+ yield '#if !defined(PB_FIELD_16BIT) && !defined(PB_FIELD_32BIT)\n'
+ if worst > 255:
+ yield '#error Field descriptor for %s is too large. Define PB_FIELD_16BIT to fix this.\n' % worst_field
+ else:
+ assertion = ' && '.join(str(c) + ' < 256' for c in checks)
+ yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT)\n' % assertion
+ yield '#endif\n\n'
+
+ if worst > 65535 or checks:
+ yield '#if !defined(PB_FIELD_32BIT)\n'
+ if worst > 65535:
+ yield '#error Field descriptor for %s is too large. Define PB_FIELD_32BIT to fix this.\n' % worst_field
+ else:
+ assertion = ' && '.join(str(c) + ' < 65536' for c in checks)
+ yield 'STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT)\n' % assertion
+ yield '#endif\n'
+
+ # End of header
yield '\n#endif\n'
def generate_source(headername, enums, messages):
print "Output fill be written to file.pb.h and file.pb.c"
sys.exit(1)
- data = open(sys.argv[1]).read()
+ data = open(sys.argv[1], 'rb').read()
fdesc = descriptor.FileDescriptorSet.FromString(data)
enums, messages = parse_file(fdesc.file[0])
print "Writing to " + headername + " and " + sourcename
+ # List of .proto files that should not be included in the C header file
+ # even if they are mentioned in the source .proto.
+ excludes = ['nanopb.proto', 'google/protobuf/descriptor.proto']
+ dependencies = [d for d in fdesc.file[0].dependency if d not in excludes]
+
header = open(headername, 'w')
- for part in generate_header(headerbasename, enums, messages):
+ for part in generate_header(dependencies, headerbasename, enums, messages):
header.write(part)
source = open(sourcename, 'w')
Code Review / apps / agl-service-can-low-level.git / blobdiff