Separation Generator to a dedicated repo

Change-Id: Id94831651c3266861435272a6e36c7884bef2c45
Signed-off-by: Romain Forlot <romain.forlot@iot.bzh>

1 files changed, 1671 insertions, 0 deletions

diff --git a/libs/nanopb/generator/nanopb_generator.py b/libs/nanopb/generator/nanopb_generator.py
new file mode 100755
index 00000000..42669ace
--- /dev/null
+++ b/libs/nanopb/generator/nanopb_generator.py
@@ -0,0 +1,1671 @@
+#!/usr/bin/env python
+
+from __future__ import unicode_literals
+
+'''Generate header file for nanopb from a ProtoBuf FileDescriptorSet.'''
+nanopb_version = "nanopb-0.3.9-dev"
+
+import sys
+import re
+from functools import reduce
+
+try:
+    # Add some dummy imports to keep packaging tools happy.
+    import google, distutils.util # bbfreeze seems to need these
+    import pkg_resources # pyinstaller / protobuf 2.5 seem to need these
+except:
+    # Don't care, we will error out later if it is actually important.
+    pass
+
+try:
+    import google.protobuf.text_format as text_format
+    import google.protobuf.descriptor_pb2 as descriptor
+except:
+    sys.stderr.write('''
+         *************************************************************
+         *** Could not import the Google protobuf Python libraries ***
+         *** Try installing package 'python-protobuf' or similar.  ***
+         *************************************************************
+    ''' + '\n')
+    raise
+
+try:
+    import proto.nanopb_pb2 as nanopb_pb2
+    import proto.plugin_pb2 as plugin_pb2
+except TypeError:
+    sys.stderr.write('''
+         ****************************************************************************
+         *** Got TypeError when importing the protocol definitions for generator. ***
+         *** This usually means that the protoc in your path doesn't match the    ***
+         *** Python protobuf library version.                                     ***
+         ***                                                                      ***
+         *** Please check the output of the following commands:                   ***
+         *** which protoc                                                         ***
+         *** protoc --version                                                     ***
+         *** python -c 'import google.protobuf; print(google.protobuf.__file__)'  ***
+         ****************************************************************************
+    ''' + '\n')
+    raise
+except:
+    sys.stderr.write('''
+         ********************************************************************
+         *** Failed to import the protocol definitions for generator.     ***
+         *** You have to run 'make' in the nanopb/generator/proto folder. ***
+         ********************************************************************
+    ''' + '\n')
+    raise
+
+# ---------------------------------------------------------------------------
+#                     Generation of single fields
+# ---------------------------------------------------------------------------
+
+import time
+import os.path
+
+# Values are tuple (c type, pb type, encoded size, int_size_allowed)
+FieldD = descriptor.FieldDescriptorProto
+datatypes = {
+    FieldD.TYPE_BOOL:       ('bool',     'BOOL',        1,  False),
+    FieldD.TYPE_DOUBLE:     ('double',   'DOUBLE',      8,  False),
+    FieldD.TYPE_FIXED32:    ('uint32_t', 'FIXED32',     4,  False),
+    FieldD.TYPE_FIXED64:    ('uint64_t', 'FIXED64',     8,  False),
+    FieldD.TYPE_FLOAT:      ('float',    'FLOAT',       4,  False),
+    FieldD.TYPE_INT32:      ('int32_t',  'INT32',      10,  True),
+    FieldD.TYPE_INT64:      ('int64_t',  'INT64',      10,  True),
+    FieldD.TYPE_SFIXED32:   ('int32_t',  'SFIXED32',    4,  False),
+    FieldD.TYPE_SFIXED64:   ('int64_t',  'SFIXED64',    8,  False),
+    FieldD.TYPE_SINT32:     ('int32_t',  'SINT32',      5,  True),
+    FieldD.TYPE_SINT64:     ('int64_t',  'SINT64',     10,  True),
+    FieldD.TYPE_UINT32:     ('uint32_t', 'UINT32',      5,  True),
+    FieldD.TYPE_UINT64:     ('uint64_t', 'UINT64',     10,  True)
+}
+
+# Integer size overrides (from .proto settings)
+intsizes = {
+    nanopb_pb2.IS_8:     'int8_t',
+    nanopb_pb2.IS_16:    'int16_t',
+    nanopb_pb2.IS_32:    'int32_t',
+    nanopb_pb2.IS_64:    'int64_t',
+}
+
+# String types (for python 2 / python 3 compatibility)
+try:
+    strtypes = (unicode, str)
+except NameError:
+    strtypes = (str, )
+
+class Names:
+    '''Keeps a set of nested names and formats them to C identifier.'''
+    def __init__(self, parts = ()):
+        if isinstance(parts, Names):
+            parts = parts.parts
+        self.parts = tuple(parts)
+
+    def __str__(self):
+        return '_'.join(self.parts)
+
+    def __add__(self, other):
+        if isinstance(other, strtypes):
+            return Names(self.parts + (other,))
+        elif isinstance(other, tuple):
+            return Names(self.parts + other)
+        else:
+            raise ValueError("Name parts should be of type str")
+
+    def __eq__(self, other):
+        return isinstance(other, Names) and self.parts == other.parts
+
+def names_from_type_name(type_name):
+    '''Parse Names() from FieldDescriptorProto type_name'''
+    if type_name[0] != '.':
+        raise NotImplementedError("Lookup of non-absolute type names is not supported")
+    return Names(type_name[1:].split('.'))
+
+def varint_max_size(max_value):
+    '''Returns the maximum number of bytes a varint can take when encoded.'''
+    if max_value < 0:
+        max_value = 2**64 - max_value
+    for i in range(1, 11):
+        if (max_value >> (i * 7)) == 0:
+            return i
+    raise ValueError("Value too large for varint: " + str(max_value))
+
+assert varint_max_size(-1) == 10
+assert varint_max_size(0) == 1
+assert varint_max_size(127) == 1
+assert varint_max_size(128) == 2
+
+class EncodedSize:
+    '''Class used to represent the encoded size of a field or a message.
+    Consists of a combination of symbolic sizes and integer sizes.'''
+    def __init__(self, value = 0, symbols = []):
+        if isinstance(value, EncodedSize):
+            self.value = value.value
+            self.symbols = value.symbols
+        elif isinstance(value, strtypes + (Names,)):
+            self.symbols = [str(value)]
+            self.value = 0
+        else:
+            self.value = value
+            self.symbols = symbols
+
+    def __add__(self, other):
+        if isinstance(other, int):
+            return EncodedSize(self.value + other, self.symbols)
+        elif isinstance(other, strtypes + (Names,)):
+            return EncodedSize(self.value, self.symbols + [str(other)])
+        elif isinstance(other, EncodedSize):
+            return EncodedSize(self.value + other.value, self.symbols + other.symbols)
+        else:
+            raise ValueError("Cannot add size: " + repr(other))
+
+    def __mul__(self, other):
+        if isinstance(other, int):
+            return EncodedSize(self.value * other, [str(other) + '*' + s for s in self.symbols])
+        else:
+            raise ValueError("Cannot multiply size: " + repr(other))
+
+    def __str__(self):
+        if not self.symbols:
+            return str(self.value)
+        else:
+            return '(' + str(self.value) + ' + ' + ' + '.join(self.symbols) + ')'
+
+    def upperlimit(self):
+        if not self.symbols:
+            return self.value
+        else:
+            return 2**32 - 1
+
+class Enum:
+    def __init__(self, names, desc, enum_options):
+        '''desc is EnumDescriptorProto'''
+
+        self.options = enum_options
+        self.names = names + desc.name
+
+        if enum_options.long_names:
+            self.values = [(self.names + x.name, x.number) for x in desc.value]
+        else:
+            self.values = [(names + x.name, x.number) for x in desc.value]
+
+        self.value_longnames = [self.names + x.name for x in desc.value]
+        self.packed = enum_options.packed_enum
+
+    def has_negative(self):
+        for n, v in self.values:
+            if v < 0:
+                return True
+        return False
+
+    def encoded_size(self):
+        return max([varint_max_size(v) for n,v in self.values])
+
+    def __str__(self):
+        result = 'typedef enum _%s {\n' % self.names
+        result += ',\n'.join(["    %s = %d" % x for x in self.values])
+        result += '\n}'
+
+        if self.packed:
+            result += ' pb_packed'
+
+        result += ' %s;' % self.names
+
+        result += '\n#define _%s_MIN %s' % (self.names, self.values[0][0])
+        result += '\n#define _%s_MAX %s' % (self.names, self.values[-1][0])
+        result += '\n#define _%s_ARRAYSIZE ((%s)(%s+1))' % (self.names, self.names, self.values[-1][0])
+
+        if not self.options.long_names:
+            # Define the long names always so that enum value references
+            # from other files work properly.
+            for i, x in enumerate(self.values):
+                result += '\n#define %s %s' % (self.value_longnames[i], x[0])
+
+        if self.options.enum_to_string:
+            result += '\nconst char *%s_name(%s v);\n' % (self.names, self.names)
+
+        return result
+
+    def enum_to_string_definition(self):
+        if not self.options.enum_to_string:
+            return ""
+
+        result = 'const char *%s_name(%s v) {\n' % (self.names, self.names)
+        result += '    switch (v) {\n'
+
+        for ((enumname, _), strname) in zip(self.values, self.value_longnames):
+            # Strip off the leading type name from the string value.
+            strval = str(strname)[len(str(self.names)) + 1:]
+            result += '        case %s: return "%s";\n' % (enumname, strval)
+
+        result += '    }\n'
+        result += '    return "unknown";\n'
+        result += '}\n'
+
+        return result
+
+class FieldMaxSize:
+    def __init__(self, worst = 0, checks = [], field_name = 'undefined'):
+        if isinstance(worst, list):
+            self.worst = max(i for i in worst if i is not None)
+        else:
+            self.worst = worst
+
+        self.worst_field = field_name
+        self.checks = list(checks)
+
+    def extend(self, extend, field_name = None):
+        self.worst = max(self.worst, extend.worst)
+
+        if self.worst == extend.worst:
+            self.worst_field = extend.worst_field
+
+        self.checks.extend(extend.checks)
+
+class Field:
+    def __init__(self, struct_name, desc, field_options):
+        '''desc is FieldDescriptorProto'''
+        self.tag = desc.number
+        self.struct_name = struct_name
+        self.union_name = None
+        self.name = desc.name
+        self.default = None
+        self.max_size = None
+        self.max_count = None
+        self.array_decl = ""
+        self.enc_size = None
+        self.ctype = None
+
+        if field_options.type == nanopb_pb2.FT_INLINE:
+            # Before nanopb-0.3.8, fixed length bytes arrays were specified
+            # by setting type to FT_INLINE. But to handle pointer typed fields,
+            # it makes sense to have it as a separate option.
+            field_options.type = nanopb_pb2.FT_STATIC
+            field_options.fixed_length = True
+
+        # Parse field options
+        if field_options.HasField("max_size"):
+            self.max_size = field_options.max_size
+        
+        if desc.type == FieldD.TYPE_STRING and field_options.HasField("max_length"):
+            # max_length overrides max_size for strings
+            self.max_size = field_options.max_length + 1
+
+        if field_options.HasField("max_count"):
+            self.max_count = field_options.max_count
+
+        if desc.HasField('default_value'):
+            self.default = desc.default_value
+
+        # Check field rules, i.e. required/optional/repeated.
+        can_be_static = True
+        if desc.label == FieldD.LABEL_REPEATED:
+            self.rules = 'REPEATED'
+            if self.max_count is None:
+                can_be_static = False
+            else:
+                self.array_decl = '[%d]' % self.max_count
+        elif field_options.proto3:
+            self.rules = 'SINGULAR'
+        elif desc.label == FieldD.LABEL_REQUIRED:
+            self.rules = 'REQUIRED'
+        elif desc.label == FieldD.LABEL_OPTIONAL:
+            self.rules = 'OPTIONAL'
+        else:
+            raise NotImplementedError(desc.label)
+
+        # Check if the field can be implemented with static allocation
+        # i.e. whether the data size is known.
+        if desc.type == FieldD.TYPE_STRING and self.max_size is None:
+            can_be_static = False
+
+        if desc.type == FieldD.TYPE_BYTES and self.max_size is None:
+            can_be_static = False
+
+        # Decide how the field data will be allocated
+        if field_options.type == nanopb_pb2.FT_DEFAULT:
+            if can_be_static:
+                field_options.type = nanopb_pb2.FT_STATIC
+            else:
+                field_options.type = nanopb_pb2.FT_CALLBACK
+
+        if field_options.type == nanopb_pb2.FT_STATIC and not can_be_static:
+            raise Exception("Field %s is defined as static, but max_size or "
+                            "max_count is not given." % self.name)
+
+        if field_options.type == nanopb_pb2.FT_STATIC:
+            self.allocation = 'STATIC'
+        elif field_options.type == nanopb_pb2.FT_POINTER:
+            self.allocation = 'POINTER'
+        elif field_options.type == nanopb_pb2.FT_CALLBACK:
+            self.allocation = 'CALLBACK'
+        else:
+            raise NotImplementedError(field_options.type)
+
+        # Decide the C data type to use in the struct.
+        if desc.type in datatypes:
+            self.ctype, self.pbtype, self.enc_size, isa = datatypes[desc.type]
+
+            # Override the field size if user wants to use smaller integers
+            if isa and field_options.int_size != nanopb_pb2.IS_DEFAULT:
+                self.ctype = intsizes[field_options.int_size]
+                if desc.type == FieldD.TYPE_UINT32 or desc.type == FieldD.TYPE_UINT64:
+                    self.ctype = 'u' + self.ctype;
+        elif desc.type == FieldD.TYPE_ENUM:
+            self.pbtype = 'ENUM'
+            self.ctype = names_from_type_name(desc.type_name)
+            if self.default is not None:
+                self.default = self.ctype + self.default
+            self.enc_size = None # Needs to be filled in when enum values are known
+        elif desc.type == FieldD.TYPE_STRING:
+            self.pbtype = 'STRING'
+            self.ctype = 'char'
+            if self.allocation == 'STATIC':
+                self.ctype = 'char'
+                self.array_decl += '[%d]' % self.max_size
+                self.enc_size = varint_max_size(self.max_size) + self.max_size
+        elif desc.type == FieldD.TYPE_BYTES:
+            if field_options.fixed_length:
+                self.pbtype = 'FIXED_LENGTH_BYTES'
+                self.enc_size = varint_max_size(self.max_size) + self.max_size
+                self.ctype = 'pb_byte_t'
+                self.array_decl += '[%d]' % self.max_size
+            else:
+                self.pbtype = 'BYTES'
+                self.ctype = 'pb_bytes_array_t'
+                if self.allocation == 'STATIC':
+                    self.ctype = self.struct_name + self.name + 't'
+                    self.enc_size = varint_max_size(self.max_size) + self.max_size
+        elif desc.type == FieldD.TYPE_MESSAGE:
+            self.pbtype = 'MESSAGE'
+            self.ctype = self.submsgname = names_from_type_name(desc.type_name)
+            self.enc_size = None # Needs to be filled in after the message type is available
+        else:
+            raise NotImplementedError(desc.type)
+
+    def __lt__(self, other):
+        return self.tag < other.tag
+
+    def __str__(self):
+        result = ''
+        if self.allocation == 'POINTER':
+            if self.rules == 'REPEATED':
+                result += '    pb_size_t ' + self.name + '_count;\n'
+
+            if self.pbtype == 'MESSAGE':
+                # Use struct definition, so recursive submessages are possible
+                result += '    struct _%s *%s;' % (self.ctype, self.name)
+            elif self.pbtype == 'FIXED_LENGTH_BYTES':
+                # Pointer to fixed size array
+                result += '    %s (*%s)%s;' % (self.ctype, self.name, self.array_decl)
+            elif self.rules == 'REPEATED' and self.pbtype in ['STRING', 'BYTES']:
+                # String/bytes arrays need to be defined as pointers to pointers
+                result += '    %s **%s;' % (self.ctype, self.name)
+            else:
+                result += '    %s *%s;' % (self.ctype, self.name)
+        elif self.allocation == 'CALLBACK':
+            result += '    pb_callback_t %s;' % self.name
+        else:
+            if self.rules == 'OPTIONAL' and self.allocation == 'STATIC':
+                result += '    bool has_' + self.name + ';\n'
+            elif self.rules == 'REPEATED' and self.allocation == 'STATIC':
+                result += '    pb_size_t ' + self.name + '_count;\n'
+            result += '    %s %s%s;' % (self.ctype, self.name, self.array_decl)
+        return result
+
+    def types(self):
+        '''Return definitions for any special types this field might need.'''
+        if self.pbtype == 'BYTES' and self.allocation == 'STATIC':
+            result = 'typedef PB_BYTES_ARRAY_T(%d) %s;\n' % (self.max_size, self.ctype)
+        else:
+            result = ''
+        return result
+
+    def get_dependencies(self):
+        '''Get list of type names used by this field.'''
+        if self.allocation == 'STATIC':
+            return [str(self.ctype)]
+        else:
+            return []
+
+    def get_initializer(self, null_init, inner_init_only = False):
+        '''Return literal expression for this field's default value.
+        null_init: If True, initialize to a 0 value instead of default from .proto
+        inner_init_only: If True, exclude initialization for any count/has fields
+        '''
+
+        inner_init = None
+        if self.pbtype == 'MESSAGE':
+            if null_init:
+                inner_init = '%s_init_zero' % self.ctype
+            else:
+                inner_init = '%s_init_default' % self.ctype
+        elif self.default is None or null_init:
+            if self.pbtype == 'STRING':
+                inner_init = '""'
+            elif self.pbtype == 'BYTES':
+                inner_init = '{0, {0}}'
+            elif self.pbtype == 'FIXED_LENGTH_BYTES':
+                inner_init = '{0}'
+            elif self.pbtype in ('ENUM', 'UENUM'):
+                inner_init = '(%s)0' % self.ctype
+            else:
+                inner_init = '0'
+        else:
+            if self.pbtype == 'STRING':
+                inner_init = self.default.replace('"', '\\"')
+                inner_init = '"' + inner_init + '"'
+            elif self.pbtype == 'BYTES':
+                data = ['0x%02x' % ord(c) for c in self.default]
+                if len(data) == 0:
+                    inner_init = '{0, {0}}'
+                else:
+                    inner_init = '{%d, {%s}}' % (len(data), ','.join(data))
+            elif self.pbtype == 'FIXED_LENGTH_BYTES':
+                data = ['0x%02x' % ord(c) for c in self.default]
+                if len(data) == 0:
+                    inner_init = '{0}'
+                else:
+                    inner_init = '{%s}' % ','.join(data)
+            elif self.pbtype in ['FIXED32', 'UINT32']:
+                inner_init = str(self.default) + 'u'
+            elif self.pbtype in ['FIXED64', 'UINT64']:
+                inner_init = str(self.default) + 'ull'
+            elif self.pbtype in ['SFIXED64', 'INT64']:
+                inner_init = str(self.default) + 'll'
+            else:
+                inner_init = str(self.default)
+
+        if inner_init_only:
+            return inner_init
+
+        outer_init = None
+        if self.allocation == 'STATIC':
+            if self.rules == 'REPEATED':
+                outer_init = '0, {'
+                outer_init += ', '.join([inner_init] * self.max_count)
+                outer_init += '}'
+            elif self.rules == 'OPTIONAL':
+                outer_init = 'false, ' + inner_init
+            else:
+                outer_init = inner_init
+        elif self.allocation == 'POINTER':
+            if self.rules == 'REPEATED':
+                outer_init = '0, NULL'
+            else:
+                outer_init = 'NULL'
+        elif self.allocation == 'CALLBACK':
+            if self.pbtype == 'EXTENSION':
+                outer_init = 'NULL'
+            else:
+                outer_init = '{{NULL}, NULL}'
+
+        return outer_init
+
+    def default_decl(self, declaration_only = False):
+        '''Return definition for this field's default value.'''
+        if self.default is None:
+            return None
+
+        ctype = self.ctype
+        default = self.get_initializer(False, True)
+        array_decl = ''
+
+        if self.pbtype == 'STRING':
+            if self.allocation != 'STATIC':
+                return None # Not implemented
+            array_decl = '[%d]' % self.max_size
+        elif self.pbtype == 'BYTES':
+            if self.allocation != 'STATIC':
+                return None # Not implemented
+        elif self.pbtype == 'FIXED_LENGTH_BYTES':
+            if self.allocation != 'STATIC':
+                return None # Not implemented
+            array_decl = '[%d]' % self.max_size
+
+        if declaration_only:
+            return 'extern const %s %s_default%s;' % (ctype, self.struct_name + self.name, array_decl)
+        else:
+            return 'const %s %s_default%s = %s;' % (ctype, self.struct_name + self.name, array_decl, default)
+
+    def tags(self):
+        '''Return the #define for the tag number of this field.'''
+        identifier = '%s_%s_tag' % (self.struct_name, self.name)
+        return '#define %-40s %d\n' % (identifier, self.tag)
+
+    def pb_field_t(self, prev_field_name, union_index = None):
+        '''Return the pb_field_t initializer to use in the constant array.
+        prev_field_name is the name of the previous field or None. For OneOf
+        unions, union_index is the index of this field inside the OneOf.
+        '''
+
+        if self.rules == 'ONEOF':
+            if self.anonymous:
+                result = '    PB_ANONYMOUS_ONEOF_FIELD(%s, ' % self.union_name
+            else:
+                result = '    PB_ONEOF_FIELD(%s, ' % self.union_name
+        else:
+            result = '    PB_FIELD('
+
+        result += '%3d, ' % self.tag
+        result += '%-8s, ' % self.pbtype
+        result += '%s, ' % self.rules
+        result += '%-8s, ' % self.allocation
+        
+        if union_index is not None and union_index > 0:
+            result += 'UNION, '
+        elif prev_field_name is None:
+            result += 'FIRST, '
+        else:
+            result += 'OTHER, '
+        
+        result += '%s, ' % self.struct_name
+        result += '%s, ' % self.name
+        result += '%s, ' % (prev_field_name or self.name)
+
+        if self.pbtype == 'MESSAGE':
+            result += '&%s_fields)' % self.submsgname
+        elif self.default is None:
+            result += '0)'
+        elif self.pbtype in ['BYTES', 'STRING', 'FIXED_LENGTH_BYTES'] and self.allocation != 'STATIC':
+            result += '0)' # Arbitrary size default values not implemented
+        elif self.rules == 'OPTEXT':
+            result += '0)' # Default value for extensions is not implemented
+        else:
+            result += '&%s_default)' % (self.struct_name + self.name)
+
+        return result
+
+    def get_last_field_name(self):
+        return self.name
+
+    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.'''
+        check = []
+        if self.pbtype == 'MESSAGE' and self.allocation == 'STATIC':
+            if self.rules == 'REPEATED':
+                check.append('pb_membersize(%s, %s[0])' % (self.struct_name, self.name))
+            elif self.rules == 'ONEOF':
+                if self.anonymous:
+                    check.append('pb_membersize(%s, %s)' % (self.struct_name, self.name))
+                else:
+                    check.append('pb_membersize(%s, %s.%s)' % (self.struct_name, self.union_name, self.name))
+            else:
+                check.append('pb_membersize(%s, %s)' % (self.struct_name, self.name))
+        elif self.pbtype == 'BYTES' and self.allocation == 'STATIC':
+            if self.max_size > 251:
+                check.append('pb_membersize(%s, %s)' % (self.struct_name, self.name))
+
+        return FieldMaxSize([self.tag, self.max_size, self.max_count],
+                            check,
+                            ('%s.%s' % (self.struct_name, self.name)))
+
+    def encoded_size(self, dependencies):
+        '''Return the maximum size that this field can take when encoded,
+        including the field tag. If the size cannot be determined, returns
+        None.'''
+
+        if self.allocation != 'STATIC':
+            return None
+
+        if self.pbtype == 'MESSAGE':
+            encsize = None
+            if str(self.submsgname) in dependencies:
+                submsg = dependencies[str(self.submsgname)]
+                encsize = submsg.encoded_size(dependencies)
+                if encsize is not None:
+                    # Include submessage length prefix
+                    encsize += varint_max_size(encsize.upperlimit())
+
+            if encsize is None:
+                # Submessage or its size cannot be found.
+                # This can occur if submessage is defined in different
+                # file, and it or its .options could not be found.
+                # Instead of direct numeric value, reference the size that
+                # has been #defined in the other file.
+                encsize = EncodedSize(self.submsgname + 'size')
+
+                # We will have to make a conservative assumption on the length
+                # prefix size, though.
+                encsize += 5
+
+        elif self.pbtype in ['ENUM', 'UENUM']:
+            if str(self.ctype) in dependencies:
+                enumtype = dependencies[str(self.ctype)]
+                encsize = enumtype.encoded_size()
+            else:
+                # Conservative assumption
+                encsize = 10
+
+        elif self.enc_size is None:
+            raise RuntimeError("Could not determine encoded size for %s.%s"
+                               % (self.struct_name, self.name))
+        else:
+            encsize = EncodedSize(self.enc_size)
+
+        encsize += varint_max_size(self.tag << 3) # Tag + wire type
+
+        if self.rules == 'REPEATED':
+            # Decoders must be always able to handle unpacked arrays.
+            # Therefore we have to reserve space for it, even though
+            # we emit packed arrays ourselves. For length of 1, packed
+            # arrays are larger however so we need to add allowance
+            # for the length byte.
+            encsize *= self.max_count
+
+            if self.max_count == 1:
+                encsize += 1
+
+        return encsize
+
+
+class ExtensionRange(Field):
+    def __init__(self, struct_name, range_start, field_options):
+        '''Implements a special pb_extension_t* field in an extensible message
+        structure. The range_start signifies the index at which the extensions
+        start. Not necessarily all tags above this are extensions, it is merely
+        a speed optimization.
+        '''
+        self.tag = range_start
+        self.struct_name = struct_name
+        self.name = 'extensions'
+        self.pbtype = 'EXTENSION'
+        self.rules = 'OPTIONAL'
+        self.allocation = 'CALLBACK'
+        self.ctype = 'pb_extension_t'
+        self.array_decl = ''
+        self.default = None
+        self.max_size = 0
+        self.max_count = 0
+
+    def __str__(self):
+        return '    pb_extension_t *extensions;'
+
+    def types(self):
+        return ''
+
+    def tags(self):
+        return ''
+
+    def encoded_size(self, dependencies):
+        # We exclude extensions from the count, because they cannot be known
+        # until runtime. Other option would be to return None here, but this
+        # way the value remains useful if extensions are not used.
+        return EncodedSize(0)
+
+class ExtensionField(Field):
+    def __init__(self, struct_name, desc, field_options):
+        self.fullname = struct_name + desc.name
+        self.extendee_name = names_from_type_name(desc.extendee)
+        Field.__init__(self, self.fullname + 'struct', desc, field_options)
+
+        if self.rules != 'OPTIONAL':
+            self.skip = True
+        else:
+            self.skip = False
+            self.rules = 'OPTEXT'
+
+    def tags(self):
+        '''Return the #define for the tag number of this field.'''
+        identifier = '%s_tag' % self.fullname
+        return '#define %-40s %d\n' % (identifier, self.tag)
+
+    def extension_decl(self):
+        '''Declaration of the extension type in the .pb.h file'''
+        if self.skip:
+            msg = '/* Extension field %s was skipped because only "optional"\n' % self.fullname
+            msg +='   type of extension fields is currently supported. */\n'
+            return msg
+
+        return ('extern const pb_extension_type_t %s; /* field type: %s */\n' %
+            (self.fullname, str(self).strip()))
+
+    def extension_def(self):
+        '''Definition of the extension type in the .pb.c file'''
+
+        if self.skip:
+            return ''
+
+        result  = 'typedef struct {\n'
+        result += str(self)
+        result += '\n} %s;\n\n' % self.struct_name
+        result += ('static const pb_field_t %s_field = \n  %s;\n\n' %
+                    (self.fullname, self.pb_field_t(None)))
+        result += 'const pb_extension_type_t %s = {\n' % self.fullname
+        result += '    NULL,\n'
+        result += '    NULL,\n'
+        result += '    &%s_field\n' % self.fullname
+        result += '};\n'
+        return result
+
+
+# ---------------------------------------------------------------------------
+#                   Generation of oneofs (unions)
+# ---------------------------------------------------------------------------
+
+class OneOf(Field):
+    def __init__(self, struct_name, oneof_desc):
+        self.struct_name = struct_name
+        self.name = oneof_desc.name
+        self.ctype = 'union'
+        self.pbtype = 'oneof'
+        self.fields = []
+        self.allocation = 'ONEOF'
+        self.default = None
+        self.rules = 'ONEOF'
+        self.anonymous = False
+
+    def add_field(self, field):
+        if field.allocation == 'CALLBACK':
+            raise Exception("Callback fields inside of oneof are not supported"
+                            + " (field %s)" % field.name)
+
+        field.union_name = self.name
+        field.rules = 'ONEOF'
+        field.anonymous = self.anonymous
+        self.fields.append(field)
+        self.fields.sort(key = lambda f: f.tag)
+
+        # Sort by the lowest tag number inside union
+        self.tag = min([f.tag for f in self.fields])
+
+    def __str__(self):
+        result = ''
+        if self.fields:
+            result += '    pb_size_t which_' + self.name + ";\n"
+            result += '    union {\n'
+            for f in self.fields:
+                result += '    ' + str(f).replace('\n', '\n    ') + '\n'
+            if self.anonymous:
+                result += '    };'
+            else:
+                result += '    } ' + self.name + ';'
+        return result
+
+    def types(self):
+        return ''.join([f.types() for f in self.fields])
+
+    def get_dependencies(self):
+        deps = []
+        for f in self.fields:
+            deps += f.get_dependencies()
+        return deps
+
+    def get_initializer(self, null_init):
+        return '0, {' + self.fields[0].get_initializer(null_init) + '}'
+
+    def default_decl(self, declaration_only = False):
+        return None
+
+    def tags(self):
+        return ''.join([f.tags() for f in self.fields])
+
+    def pb_field_t(self, prev_field_name):
+        parts = []
+        for union_index, field in enumerate(self.fields):
+            parts.append(field.pb_field_t(prev_field_name, union_index))
+        return ',\n'.join(parts)
+
+    def get_last_field_name(self):
+        if self.anonymous:
+            return self.fields[-1].name
+        else:
+            return self.name + '.' + self.fields[-1].name
+
+    def largest_field_value(self):
+        largest = FieldMaxSize()
+        for f in self.fields:
+            largest.extend(f.largest_field_value())
+        return largest
+
+    def encoded_size(self, dependencies):
+        '''Returns the size of the largest oneof field.'''
+        largest = EncodedSize(0)
+        for f in self.fields:
+            size = EncodedSize(f.encoded_size(dependencies))
+            if size.value is None:
+                return None
+            elif size.symbols:
+                return None # Cannot resolve maximum of symbols
+            elif size.value > largest.value:
+                largest = size
+
+        return largest
+
+# ---------------------------------------------------------------------------
+#                   Generation of messages (structures)
+# ---------------------------------------------------------------------------
+
+
+class Message:
+    def __init__(self, names, desc, message_options):
+        self.name = names
+        self.fields = []
+        self.oneofs = {}
+        no_unions = []
+
+        if message_options.msgid:
+            self.msgid = message_options.msgid
+
+        if hasattr(desc, 'oneof_decl'):
+            for i, f in enumerate(desc.oneof_decl):
+                oneof_options = get_nanopb_suboptions(desc, message_options, self.name + f.name)
+                if oneof_options.no_unions:
+                    no_unions.append(i) # No union, but add fields normally
+                elif oneof_options.type == nanopb_pb2.FT_IGNORE:
+                    pass # No union and skip fields also
+                else:
+                    oneof = OneOf(self.name, f)
+                    if oneof_options.anonymous_oneof:
+                        oneof.anonymous = True
+                    self.oneofs[i] = oneof
+                    self.fields.append(oneof)
+
+        for f in desc.field:
+            field_options = get_nanopb_suboptions(f, message_options, self.name + f.name)
+            if field_options.type == nanopb_pb2.FT_IGNORE:
+                continue
+
+            field = Field(self.name, f, field_options)
+            if (hasattr(f, 'oneof_index') and
+                f.HasField('oneof_index') and
+                f.oneof_index not in no_unions):
+                if f.oneof_index in self.oneofs:
+                    self.oneofs[f.oneof_index].add_field(field)
+            else:
+                self.fields.append(field)
+
+        if len(desc.extension_range) > 0:
+            field_options = get_nanopb_suboptions(desc, message_options, self.name + 'extensions')
+            range_start = min([r.start for r in desc.extension_range])
+            if field_options.type != nanopb_pb2.FT_IGNORE:
+                self.fields.append(ExtensionRange(self.name, range_start, field_options))
+
+        self.packed = message_options.packed_struct
+        self.ordered_fields = self.fields[:]
+        self.ordered_fields.sort()
+
+    def get_dependencies(self):
+        '''Get list of type names that this structure refers to.'''
+        deps = []
+        for f in self.fields:
+            deps += f.get_dependencies()
+        return deps
+
+    def __str__(self):
+        result = 'typedef struct _%s {\n' % self.name
+
+        if not self.ordered_fields:
+            # Empty structs are not allowed in C standard.
+            # Therefore add a dummy field if an empty message occurs.
+            result += '    char dummy_field;'
+
+        result += '\n'.join([str(f) for f in self.ordered_fields])
+        result += '\n/* @@protoc_insertion_point(struct:%s) */' % self.name
+        result += '\n}'
+
+        if self.packed:
+            result += ' pb_packed'
+
+        result += ' %s;' % self.name
+
+        if self.packed:
+            result = 'PB_PACKED_STRUCT_START\n' + result
+            result += '\nPB_PACKED_STRUCT_END'
+
+        return result
+
+    def types(self):
+        return ''.join([f.types() for f in self.fields])
+
+    def get_initializer(self, null_init):
+        if not self.ordered_fields:
+            return '{0}'
+
+        parts = []
+        for field in self.ordered_fields:
+            parts.append(field.get_initializer(null_init))
+        return '{' + ', '.join(parts) + '}'
+
+    def default_decl(self, declaration_only = False):
+        result = ""
+        for field in self.fields:
+            default = field.default_decl(declaration_only)
+            if default is not None:
+                result += default + '\n'
+        return result
+
+    def count_required_fields(self):
+        '''Returns number of required fields inside this message'''
+        count = 0
+        for f in self.fields:
+            if not isinstance(f, OneOf):
+                if f.rules == 'REQUIRED':
+                    count += 1
+        return count
+
+    def count_all_fields(self):
+        count = 0
+        for f in self.fields:
+            if isinstance(f, OneOf):
+                count += len(f.fields)
+            else:
+                count += 1
+        return count
+
+    def fields_declaration(self):
+        result = 'extern const pb_field_t %s_fields[%d];' % (self.name, self.count_all_fields() + 1)
+        return result
+
+    def fields_definition(self):
+        result = 'const pb_field_t %s_fields[%d] = {\n' % (self.name, self.count_all_fields() + 1)
+
+        prev = None
+        for field in self.ordered_fields:
+            result += field.pb_field_t(prev)
+            result += ',\n'
+            prev = field.get_last_field_name()
+
+        result += '    PB_LAST_FIELD\n};'
+        return result
+
+    def encoded_size(self, dependencies):
+        '''Return the maximum size that this message can take when encoded.
+        If the size cannot be determined, returns None.
+        '''
+        size = EncodedSize(0)
+        for field in self.fields:
+            fsize = field.encoded_size(dependencies)
+            if fsize is None:
+                return None
+            size += fsize
+
+        return size
+
+
+# ---------------------------------------------------------------------------
+#                    Processing of entire .proto files
+# ---------------------------------------------------------------------------
+
+def iterate_messages(desc, names = Names()):
+    '''Recursively find all messages. For each, yield name, DescriptorProto.'''
+    if hasattr(desc, 'message_type'):
+        submsgs = desc.message_type
+    else:
+        submsgs = desc.nested_type
+
+    for submsg in submsgs:
+        sub_names = names + submsg.name
+        yield sub_names, submsg
+
+        for x in iterate_messages(submsg, sub_names):
+            yield x
+
+def iterate_extensions(desc, names = Names()):
+    '''Recursively find all extensions.
+    For each, yield name, FieldDescriptorProto.
+    '''
+    for extension in desc.extension:
+        yield names, extension
+
+    for subname, subdesc in iterate_messages(desc, names):
+        for extension in subdesc.extension:
+            yield subname, extension
+
+def toposort2(data):
+    '''Topological sort.
+    From http://code.activestate.com/recipes/577413-topological-sort/
+    This function is under the MIT license.
+    '''
+    for k, v in list(data.items()):
+        v.discard(k) # Ignore self dependencies
+    extra_items_in_deps = reduce(set.union, list(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 list(data.items()) if not dep)
+        if not ordered:
+            break
+        for item in sorted(ordered):
+            yield item
+        data = dict([(item, (dep - ordered)) for item,dep in list(data.items())
+                if item not in ordered])
+    assert not data, "A cyclic dependency exists amongst %r" % data
+
+def sort_dependencies(messages):
+    '''Sort a list of Messages based on dependencies.'''
+    dependencies = {}
+    message_by_name = {}
+    for message in messages:
+        dependencies[str(message.name)] = set(message.get_dependencies())
+        message_by_name[str(message.name)] = message
+
+    for msgname in toposort2(dependencies):
+        if msgname in message_by_name:
+            yield message_by_name[msgname]
+
+def make_identifier(headername):
+    '''Make #ifndef identifier that contains uppercase A-Z and digits 0-9'''
+    result = ""
+    for c in headername.upper():
+        if c.isalnum():
+            result += c
+        else:
+            result += '_'
+    return result
+
+class ProtoFile:
+    def __init__(self, fdesc, file_options):
+        '''Takes a FileDescriptorProto and parses it.'''
+        self.fdesc = fdesc
+        self.file_options = file_options
+        self.dependencies = {}
+        self.parse()
+
+        # Some of types used in this file probably come from the file itself.
+        # Thus it has implicit dependency on itself.
+        self.add_dependency(self)
+
+    def parse(self):
+        self.enums = []
+        self.messages = []
+        self.extensions = []
+
+        if self.fdesc.package:
+            base_name = Names(self.fdesc.package.split('.'))
+        else:
+            base_name = Names()
+
+        for enum in self.fdesc.enum_type:
+            enum_options = get_nanopb_suboptions(enum, self.file_options, base_name + enum.name)
+            self.enums.append(Enum(base_name, enum, enum_options))
+
+        for names, message in iterate_messages(self.fdesc, base_name):
+            message_options = get_nanopb_suboptions(message, self.file_options, names)
+
+            if message_options.skip_message:
+                continue
+
+            self.messages.append(Message(names, message, message_options))
+            for enum in message.enum_type:
+                enum_options = get_nanopb_suboptions(enum, message_options, names + enum.name)
+                self.enums.append(Enum(names, enum, enum_options))
+
+        for names, extension in iterate_extensions(self.fdesc, base_name):
+            field_options = get_nanopb_suboptions(extension, self.file_options, names + extension.name)
+            if field_options.type != nanopb_pb2.FT_IGNORE:
+                self.extensions.append(ExtensionField(names, extension, field_options))
+
+    def add_dependency(self, other):
+        for enum in other.enums:
+            self.dependencies[str(enum.names)] = enum
+
+        for msg in other.messages:
+            self.dependencies[str(msg.name)] = msg
+
+        # Fix field default values where enum short names are used.
+        for enum in other.enums:
+            if not enum.options.long_names:
+                for message in self.messages:
+                    for field in message.fields:
+                        if field.default in enum.value_longnames:
+                            idx = enum.value_longnames.index(field.default)
+                            field.default = enum.values[idx][0]
+
+        # Fix field data types where enums have negative values.
+        for enum in other.enums:
+            if not enum.has_negative():
+                for message in self.messages:
+                    for field in message.fields:
+                        if field.pbtype == 'ENUM' and field.ctype == enum.names:
+                            field.pbtype = 'UENUM'
+
+    def generate_header(self, includes, headername, options):
+        '''Generate content for a header file.
+        Generates strings, which should be concatenated and stored to file.
+        '''
+
+        yield '/* Automatically generated nanopb header */\n'
+        if options.notimestamp:
+            yield '/* Generated by %s */\n\n' % (nanopb_version)
+        else:
+            yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
+
+        if self.fdesc.package:
+            symbol = make_identifier(self.fdesc.package + '_' + headername)
+        else:
+            symbol = make_identifier(headername)
+        yield '#ifndef PB_%s_INCLUDED\n' % symbol
+        yield '#define PB_%s_INCLUDED\n' % symbol
+        try:
+            yield options.libformat % ('pb.h')
+        except TypeError:
+            # no %s specified - use whatever was passed in as options.libformat
+            yield options.libformat
+        yield '\n'
+
+        for incfile in includes:
+            noext = os.path.splitext(incfile)[0]
+            yield options.genformat % (noext + options.extension + '.h')
+            yield '\n'
+
+        yield '/* @@protoc_insertion_point(includes) */\n'
+
+        yield '#if PB_PROTO_HEADER_VERSION != 30\n'
+        yield '#error Regenerate this file with the current version of nanopb generator.\n'
+        yield '#endif\n'
+        yield '\n'
+
+        yield '#ifdef __cplusplus\n'
+        yield 'extern "C" {\n'
+        yield '#endif\n\n'
+
+        if self.enums:
+            yield '/* Enum definitions */\n'
+            for enum in self.enums:
+                yield str(enum) + '\n\n'
+
+        if self.messages:
+            yield '/* Struct definitions */\n'
+            for msg in sort_dependencies(self.messages):
+                yield msg.types()
+                yield str(msg) + '\n\n'
+
+        if self.extensions:
+            yield '/* Extensions */\n'
+            for extension in self.extensions:
+                yield extension.extension_decl()
+            yield '\n'
+
+        if self.messages:
+            yield '/* Default values for struct fields */\n'
+            for msg in self.messages:
+                yield msg.default_decl(True)
+            yield '\n'
+
+            yield '/* Initializer values for message structs */\n'
+            for msg in self.messages:
+                identifier = '%s_init_default' % msg.name
+                yield '#define %-40s %s\n' % (identifier, msg.get_initializer(False))
+            for msg in self.messages:
+                identifier = '%s_init_zero' % msg.name
+                yield '#define %-40s %s\n' % (identifier, msg.get_initializer(True))
+            yield '\n'
+
+            yield '/* Field tags (for use in manual encoding/decoding) */\n'
+            for msg in sort_dependencies(self.messages):
+                for field in msg.fields:
+                    yield field.tags()
+            for extension in self.extensions:
+                yield extension.tags()
+            yield '\n'
+
+            yield '/* Struct field encoding specification for nanopb */\n'
+            for msg in self.messages:
+                yield msg.fields_declaration() + '\n'
+            yield '\n'
+
+            yield '/* Maximum encoded size of messages (where known) */\n'
+            for msg in self.messages:
+                msize = msg.encoded_size(self.dependencies)
+                identifier = '%s_size' % msg.name
+                if msize is not None:
+                    yield '#define %-40s %s\n' % (identifier, msize)
+                else:
+                    yield '/* %s depends on runtime parameters */\n' % identifier
+            yield '\n'
+
+            yield '/* Message IDs (where set with "msgid" option) */\n'
+
+            yield '#ifdef PB_MSGID\n'
+            for msg in self.messages:
+                if hasattr(msg,'msgid'):
+                    yield '#define PB_MSG_%d %s\n' % (msg.msgid, msg.name)
+            yield '\n'
+
+            symbol = make_identifier(headername.split('.')[0])
+            yield '#define %s_MESSAGES \\\n' % symbol
+
+            for msg in self.messages:
+                m = "-1"
+                msize = msg.encoded_size(self.dependencies)
+                if msize is not None:
+                    m = msize
+                if hasattr(msg,'msgid'):
+                    yield '\tPB_MSG(%d,%s,%s) \\\n' % (msg.msgid, m, msg.name)
+            yield '\n'
+
+            for msg in self.messages:
+                if hasattr(msg,'msgid'):
+                    yield '#define %s_msgid %d\n' % (msg.name, msg.msgid)
+            yield '\n'
+
+            yield '#endif\n\n'
+
+        yield '#ifdef __cplusplus\n'
+        yield '} /* extern "C" */\n'
+        yield '#endif\n'
+
+        # End of header
+        yield '/* @@protoc_insertion_point(eof) */\n'
+        yield '\n#endif\n'
+
+    def generate_source(self, headername, options):
+        '''Generate content for a source file.'''
+
+        yield '/* Automatically generated nanopb constant definitions */\n'
+        if options.notimestamp:
+            yield '/* Generated by %s */\n\n' % (nanopb_version)
+        else:
+            yield '/* Generated by %s at %s. */\n\n' % (nanopb_version, time.asctime())
+        yield options.genformat % (headername)
+        yield '\n'
+        yield '/* @@protoc_insertion_point(includes) */\n'
+
+        yield '#if PB_PROTO_HEADER_VERSION != 30\n'
+        yield '#error Regenerate this file with the current version of nanopb generator.\n'
+        yield '#endif\n'
+        yield '\n'
+
+        for msg in self.messages:
+            yield msg.default_decl(False)
+
+        yield '\n\n'
+
+        for msg in self.messages:
+            yield msg.fields_definition() + '\n\n'
+
+        for ext in self.extensions:
+            yield ext.extension_def() + '\n'
+
+        for enum in self.enums:
+            yield enum.enum_to_string_definition() + '\n'
+
+        # Add checks for numeric limits
+        if self.messages:
+            largest_msg = max(self.messages, key = lambda m: m.count_required_fields())
+            largest_count = largest_msg.count_required_fields()
+            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'
+
+        max_field = FieldMaxSize()
+        checks_msgnames = []
+        for msg in self.messages:
+            checks_msgnames.append(msg.name)
+            for field in msg.fields:
+                max_field.extend(field.largest_field_value())
+
+        worst = max_field.worst
+        worst_field = max_field.worst_field
+        checks = max_field.checks
+
+        if worst > 255 or checks:
+            yield '\n/* Check that field information fits in pb_field_t */\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)
+                    msgs = '_'.join(str(n) for n in checks_msgnames)
+                    yield '/* If you get an error here, it means that you need to define PB_FIELD_32BIT\n'
+                    yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
+                    yield ' * \n'
+                    yield ' * The reason you need to do this is that some of your messages contain tag\n'
+                    yield ' * numbers or field sizes that are larger than what can fit in 8 or 16 bit\n'
+                    yield ' * field descriptors.\n'
+                    yield ' */\n'
+                    yield 'PB_STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_32BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
+                yield '#endif\n\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)
+                    msgs = '_'.join(str(n) for n in checks_msgnames)
+                    yield '/* If you get an error here, it means that you need to define PB_FIELD_16BIT\n'
+                    yield ' * compile-time option. You can do that in pb.h or on compiler command line.\n'
+                    yield ' * \n'
+                    yield ' * The reason you need to do this is that some of your messages contain tag\n'
+                    yield ' * numbers or field sizes that are larger than what can fit in the default\n'
+                    yield ' * 8 bit descriptors.\n'
+                    yield ' */\n'
+                    yield 'PB_STATIC_ASSERT((%s), YOU_MUST_DEFINE_PB_FIELD_16BIT_FOR_MESSAGES_%s)\n'%(assertion,msgs)
+                yield '#endif\n\n'
+
+        # Add check for sizeof(double)
+        has_double = False
+        for msg in self.messages:
+            for field in msg.fields:
+                if field.ctype == 'double':
+                    has_double = True
+
+        if has_double:
+            yield '\n'
+            yield '/* On some platforms (such as AVR), double is really float.\n'
+            yield ' * These are not directly supported by nanopb, but see example_avr_double.\n'
+            yield ' * To get rid of this error, remove any double fields from your .proto.\n'
+            yield ' */\n'
+            yield 'PB_STATIC_ASSERT(sizeof(double) == 8, DOUBLE_MUST_BE_8_BYTES)\n'
+
+        yield '\n'
+        yield '/* @@protoc_insertion_point(eof) */\n'
+
+# ---------------------------------------------------------------------------
+#                    Options parsing for the .proto files
+# ---------------------------------------------------------------------------
+
+from fnmatch import fnmatch
+
+def read_options_file(infile):
+    '''Parse a separate options file to list:
+        [(namemask, options), ...]
+    '''
+    results = []
+    data = infile.read()
+    data = re.sub('/\*.*?\*/', '', data, flags = re.MULTILINE)
+    data = re.sub('//.*?$', '', data, flags = re.MULTILINE)
+    data = re.sub('#.*?$', '', data, flags = re.MULTILINE)
+    for i, line in enumerate(data.split('\n')):
+        line = line.strip()
+        if not line:
+            continue
+
+        parts = line.split(None, 1)
+
+        if len(parts) < 2:
+            sys.stderr.write("%s:%d: " % (infile.name, i + 1) +
+                             "Option lines should have space between field name and options. " +
+                             "Skipping line: '%s'\n" % line)
+            continue
+
+        opts = nanopb_pb2.NanoPBOptions()
+
+        try:
+            text_format.Merge(parts[1], opts)
+        except Exception as e:
+            sys.stderr.write("%s:%d: " % (infile.name, i + 1) +
+                             "Unparseable option line: '%s'. " % line +
+                             "Error: %s\n" % str(e))
+            continue
+        results.append((parts[0], opts))
+
+    return results
+
+class Globals:
+    '''Ugly global variables, should find a good way to pass these.'''
+    verbose_options = False
+    separate_options = []
+    matched_namemasks = set()
+
+def get_nanopb_suboptions(subdesc, options, name):
+    '''Get copy of options, and merge information from subdesc.'''
+    new_options = nanopb_pb2.NanoPBOptions()
+    new_options.CopyFrom(options)
+
+    if hasattr(subdesc, 'syntax') and subdesc.syntax == "proto3":
+        new_options.proto3 = True
+
+    # Handle options defined in a separate file
+    dotname = '.'.join(name.parts)
+    for namemask, options in Globals.separate_options:
+        if fnmatch(dotname, namemask):
+            Globals.matched_namemasks.add(namemask)
+            new_options.MergeFrom(options)
+
+    # Handle options defined in .proto
+    if isinstance(subdesc.options, descriptor.FieldOptions):
+        ext_type = nanopb_pb2.nanopb
+    elif isinstance(subdesc.options, descriptor.FileOptions):
+        ext_type = nanopb_pb2.nanopb_fileopt
+    elif isinstance(subdesc.options, descriptor.MessageOptions):
+        ext_type = nanopb_pb2.nanopb_msgopt
+    elif isinstance(subdesc.options, descriptor.EnumOptions):
+        ext_type = nanopb_pb2.nanopb_enumopt
+    else:
+        raise Exception("Unknown options type")
+
+    if subdesc.options.HasExtension(ext_type):
+        ext = subdesc.options.Extensions[ext_type]
+        new_options.MergeFrom(ext)
+
+    if Globals.verbose_options:
+        sys.stderr.write("Options for " + dotname + ": ")
+        sys.stderr.write(text_format.MessageToString(new_options) + "\n")
+
+    return new_options
+
+
+# ---------------------------------------------------------------------------
+#                         Command line interface
+# ---------------------------------------------------------------------------
+
+import sys
+import os.path
+from optparse import OptionParser
+
+optparser = OptionParser(
+    usage = "Usage: nanopb_generator.py [options] file.pb ...",
+    epilog = "Compile file.pb from file.proto by: 'protoc -ofile.pb file.proto'. " +
+             "Output will be written to file.pb.h and file.pb.c.")
+optparser.add_option("-x", dest="exclude", metavar="FILE", action="append", default=[],
+    help="Exclude file from generated #include list.")
+optparser.add_option("-e", "--extension", dest="extension", metavar="EXTENSION", default=".pb",
+    help="Set extension to use instead of '.pb' for generated files. [default: %default]")
+optparser.add_option("-f", "--options-file", dest="options_file", metavar="FILE", default="%s.options",
+    help="Set name of a separate generator options file.")
+optparser.add_option("-I", "--options-path", dest="options_path", metavar="DIR",
+    action="append", default = [],
+    help="Search for .options files additionally in this path")
+optparser.add_option("-D", "--output-dir", dest="output_dir",
+                     metavar="OUTPUTDIR", default=None,
+                     help="Output directory of .pb.h and .pb.c files")
+optparser.add_option("-Q", "--generated-include-format", dest="genformat",
+    metavar="FORMAT", default='#include "%s"\n',
+    help="Set format string to use for including other .pb.h files. [default: %default]")
+optparser.add_option("-L", "--library-include-format", dest="libformat",
+    metavar="FORMAT", default='#include <%s>\n',
+    help="Set format string to use for including the nanopb pb.h header. [default: %default]")
+optparser.add_option("-T", "--no-timestamp", dest="notimestamp", action="store_true", default=False,
+    help="Don't add timestamp to .pb.h and .pb.c preambles")
+optparser.add_option("-q", "--quiet", dest="quiet", action="store_true", default=False,
+    help="Don't print anything except errors.")
+optparser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
+    help="Print more information.")
+optparser.add_option("-s", dest="settings", metavar="OPTION:VALUE", action="append", default=[],
+    help="Set generator option (max_size, max_count etc.).")
+
+def parse_file(filename, fdesc, options):
+    '''Parse a single file. Returns a ProtoFile instance.'''
+    toplevel_options = nanopb_pb2.NanoPBOptions()
+    for s in options.settings:
+        text_format.Merge(s, toplevel_options)
+
+    if not fdesc:
+        data = open(filename, 'rb').read()
+        fdesc = descriptor.FileDescriptorSet.FromString(data).file[0]
+
+    # Check if there is a separate .options file
+    had_abspath = False
+    try:
+        optfilename = options.options_file % os.path.splitext(filename)[0]
+    except TypeError:
+        # No %s specified, use the filename as-is
+        optfilename = options.options_file
+        had_abspath = True
+
+    paths = ['.'] + options.options_path
+    for p in paths:
+        if os.path.isfile(os.path.join(p, optfilename)):
+            optfilename = os.path.join(p, optfilename)
+            if options.verbose:
+                sys.stderr.write('Reading options from ' + optfilename + '\n')
+            Globals.separate_options = read_options_file(open(optfilename, "rU"))
+            break
+    else:
+        # If we are given a full filename and it does not exist, give an error.
+        # However, don't give error when we automatically look for .options file
+        # with the same name as .proto.
+        if options.verbose or had_abspath:
+            sys.stderr.write('Options file not found: ' + optfilename + '\n')
+        Globals.separate_options = []
+
+    Globals.matched_namemasks = set()
+
+    # Parse the file
+    file_options = get_nanopb_suboptions(fdesc, toplevel_options, Names([filename]))
+    f = ProtoFile(fdesc, file_options)
+    f.optfilename = optfilename
+
+    return f
+
+def process_file(filename, fdesc, options, other_files = {}):
+    '''Process a single file.
+    filename: The full path to the .proto or .pb source file, as string.
+    fdesc: The loaded FileDescriptorSet, or None to read from the input file.
+    options: Command line options as they come from OptionsParser.
+
+    Returns a dict:
+        {'headername': Name of header file,
+         'headerdata': Data for the .h header file,
+         'sourcename': Name of the source code file,
+         'sourcedata': Data for the .c source code file
+        }
+    '''
+    f = parse_file(filename, fdesc, options)
+
+    # Provide dependencies if available
+    for dep in f.fdesc.dependency:
+        if dep in other_files:
+            f.add_dependency(other_files[dep])
+
+    # Decide the file names
+    noext = os.path.splitext(filename)[0]
+    headername = noext + options.extension + '.h'
+    sourcename = noext + options.extension + '.c'
+    headerbasename = os.path.basename(headername)
+
+    # 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'] + options.exclude
+    includes = [d for d in f.fdesc.dependency if d not in excludes]
+
+    headerdata = ''.join(f.generate_header(includes, headerbasename, options))
+    sourcedata = ''.join(f.generate_source(headerbasename, options))
+
+    # Check if there were any lines in .options that did not match a member
+    unmatched = [n for n,o in Globals.separate_options if n not in Globals.matched_namemasks]
+    if unmatched and not options.quiet:
+        sys.stderr.write("Following patterns in " + f.optfilename + " did not match any fields: "
+                         + ', '.join(unmatched) + "\n")
+        if not Globals.verbose_options:
+            sys.stderr.write("Use  protoc --nanopb-out=-v:.   to see a list of the field names.\n")
+
+    return {'headername': headername, 'headerdata': headerdata,
+            'sourcename': sourcename, 'sourcedata': sourcedata}
+
+def main_cli():
+    '''Main function when invoked directly from the command line.'''
+
+    options, filenames = optparser.parse_args()
+
+    if not filenames:
+        optparser.print_help()
+        sys.exit(1)
+
+    if options.quiet:
+        options.verbose = False
+
+    if options.output_dir and not os.path.exists(options.output_dir):
+        optparser.print_help()
+        sys.stderr.write("\noutput_dir does not exist: %s\n" % options.output_dir)
+        sys.exit(1)
+
+
+    Globals.verbose_options = options.verbose
+    for filename in filenames:
+        results = process_file(filename, None, options)
+
+        base_dir = options.output_dir or ''
+        to_write = [
+            (os.path.join(base_dir, results['headername']), results['headerdata']),
+            (os.path.join(base_dir, results['sourcename']), results['sourcedata']),
+        ]
+
+        if not options.quiet:
+            paths = " and ".join([x[0] for x in to_write])
+            sys.stderr.write("Writing to %s\n" % paths)
+
+        for path, data in to_write:
+            with open(path, 'w') as f:
+                f.write(data)
+
+def main_plugin():
+    '''Main function when invoked as a protoc plugin.'''
+
+    import io, sys
+    if sys.platform == "win32":
+        import os, msvcrt
+        # Set stdin and stdout to binary mode
+        msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
+        msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
+
+    data = io.open(sys.stdin.fileno(), "rb").read()
+
+    request = plugin_pb2.CodeGeneratorRequest.FromString(data)
+
+    try:
+        # Versions of Python prior to 2.7.3 do not support unicode
+        # input to shlex.split(). Try to convert to str if possible.
+        params = str(request.parameter)
+    except UnicodeEncodeError:
+        params = request.parameter
+
+    import shlex
+    args = shlex.split(params)
+    options, dummy = optparser.parse_args(args)
+
+    Globals.verbose_options = options.verbose
+
+    response = plugin_pb2.CodeGeneratorResponse()
+
+    # Google's protoc does not currently indicate the full path of proto files.
+    # Instead always add the main file path to the search dirs, that works for
+    # the common case.
+    import os.path
+    options.options_path.append(os.path.dirname(request.file_to_generate[0]))
+
+    # Process any include files first, in order to have them
+    # available as dependencies
+    other_files = {}
+    for fdesc in request.proto_file:
+        other_files[fdesc.name] = parse_file(fdesc.name, fdesc, options)
+
+    for filename in request.file_to_generate:
+        for fdesc in request.proto_file:
+            if fdesc.name == filename:
+                results = process_file(filename, fdesc, options, other_files)
+
+                f = response.file.add()
+                f.name = results['headername']
+                f.content = results['headerdata']
+
+                f = response.file.add()
+                f.name = results['sourcename']
+                f.content = results['sourcedata']
+
+    io.open(sys.stdout.fileno(), "wb").write(response.SerializeToString())
+
+if __name__ == '__main__':
+    # Check if we are running as a plugin under protoc
+    if 'protoc-gen-' in sys.argv[0] or '--protoc-plugin' in sys.argv:
+        main_plugin()
+    else:
+        main_cli()