1/*
2 * Copyright (c) 2007,2011-2012 Apple Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24#include "antlrplugin.h"
25#include "cserror.h"
26#include "RequirementLexer.hpp"
27#include "RequirementParser.hpp"
28#include <antlr/TokenStreamException.hpp>
29
30
31namespace Security {
32namespace CodeSigning {
33
34namespace Parser = Security_CodeSigning;
35
36
37//
38// Lexer input adapters
39//
40class StdioInputStream : public antlr::InputBuffer {
41public:
42	StdioInputStream(FILE *fp) : mFile(fp) { }
43	int getChar() { return fgetc(mFile); }
44
45private:
46	FILE *mFile;
47};
48
49class StringInputStream : public antlr::InputBuffer {
50public:
51	StringInputStream(const string &s) : mInput(s), mPos(mInput.begin()) { }
52	int getChar() { return (mPos == mInput.end()) ? EOF : *mPos++; }
53
54private:
55	string mInput;
56	string::const_iterator mPos;
57};
58
59
60//
61// Generic parser driver
62//
63template <class Input, class Source, class Result>
64const Result *parse(Source source, Result *(Parser::RequirementParser::*rule)(), std::string &errors)
65{
66	Input input(source);
67	Parser::RequirementLexer lexer(input);
68	Parser::RequirementParser parser(lexer);
69	try {
70		const Result *result = (parser.*rule)();
71		errors = parser.errors;
72		if (errors.empty())
73			return result;
74		else
75			::free((void *)result);
76	} catch (const antlr::TokenStreamException &ex) {
77		errors = ex.toString() + "\n";
78	}
79	return NULL;			// signal failure
80}
81
82
83//
84// Hook up each supported parsing action to the plugin interface
85//
86static
87const Requirement *fileRequirement(FILE *source, string &errors)
88{ return parse<StdioInputStream>(source, &Parser::RequirementParser::requirement, errors); }
89
90static
91const Requirement *stringRequirement(string source, string &errors)
92{ return parse<StringInputStream>(source, &Parser::RequirementParser::requirement, errors); }
93
94static
95const Requirements *fileRequirements(FILE *source, string &errors)
96{ return parse<StdioInputStream>(source, &Parser::RequirementParser::requirementSet, errors); }
97
98static
99const Requirements *stringRequirements(string source, string &errors)
100{ return parse<StringInputStream>(source, &Parser::RequirementParser::requirementSet, errors); }
101
102static
103const BlobCore *fileGeneric(FILE *source, string &errors)
104{ return parse<StdioInputStream>(source, &Parser::RequirementParser::autosense, errors); }
105
106static
107const BlobCore *stringGeneric(string source, string &errors)
108{ return parse<StringInputStream>(source, &Parser::RequirementParser::autosense, errors); }
109
110
111//
112// Basic plugin hookup
113//
114static AntlrPlugin plugin = {
115	fileRequirement,
116	fileRequirements,
117	fileGeneric,
118	stringRequirement,
119	stringRequirements,
120	stringGeneric
121};
122
123AntlrPlugin *findAntlrPlugin()
124{
125	return &plugin;
126}
127
128
129} // end namespace CodeSigning
130} // end namespace Security
131