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Side by Side Diff: webrtc/base/base64.h

Issue 2877023002: Move webrtc/{base => rtc_base} (Closed)
Patch Set: update presubmit.py and DEPS include rules Created 3 years, 5 months ago
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1 1
2 //********************************************************************* 2 //*********************************************************************
3 //* C_Base64 - a simple base64 encoder and decoder. 3 //* C_Base64 - a simple base64 encoder and decoder.
4 //* 4 //*
5 //* Copyright (c) 1999, Bob Withers - bwit@pobox.com 5 //* Copyright (c) 1999, Bob Withers - bwit@pobox.com
6 //* 6 //*
7 //* This code may be freely used for any purpose, either personal 7 //* This code may be freely used for any purpose, either personal
8 //* or commercial, provided the authors copyright notice remains 8 //* or commercial, provided the authors copyright notice remains
9 //* intact. 9 //* intact.
10 //********************************************************************* 10 //*********************************************************************
11 11
12 #ifndef WEBRTC_BASE_BASE64_H__ 12 #ifndef WEBRTC_BASE_BASE64_H_
13 #define WEBRTC_BASE_BASE64_H__ 13 #define WEBRTC_BASE_BASE64_H_
14 14
15 #include <string>
16 #include <vector>
17 15
18 namespace rtc { 16 // This header is deprecated and is just left here temporarily during
17 // refactoring. See https://bugs.webrtc.org/7634 for more details.
18 #include "webrtc/rtc_base/base64.h"
19 19
20 class Base64 { 20 #endif // WEBRTC_BASE_BASE64_H_
21 public:
22 enum DecodeOption {
23 DO_PARSE_STRICT = 1, // Parse only base64 characters
24 DO_PARSE_WHITE = 2, // Parse only base64 and whitespace characters
25 DO_PARSE_ANY = 3, // Parse all characters
26 DO_PARSE_MASK = 3,
27
28 DO_PAD_YES = 4, // Padding is required
29 DO_PAD_ANY = 8, // Padding is optional
30 DO_PAD_NO = 12, // Padding is disallowed
31 DO_PAD_MASK = 12,
32
33 DO_TERM_BUFFER = 16, // Must termiante at end of buffer
34 DO_TERM_CHAR = 32, // May terminate at any character boundary
35 DO_TERM_ANY = 48, // May terminate at a sub-character bit offset
36 DO_TERM_MASK = 48,
37
38 // Strictest interpretation
39 DO_STRICT = DO_PARSE_STRICT | DO_PAD_YES | DO_TERM_BUFFER,
40
41 DO_LAX = DO_PARSE_ANY | DO_PAD_ANY | DO_TERM_CHAR,
42 };
43 typedef int DecodeFlags;
44
45 static bool IsBase64Char(char ch);
46
47 // Get the char next to the |ch| from the Base64Table.
48 // If the |ch| is the last one in the Base64Table then returns
49 // the first one from the table.
50 // Expects the |ch| be a base64 char.
51 // The result will be saved in |next_ch|.
52 // Returns true on success.
53 static bool GetNextBase64Char(char ch, char* next_ch);
54
55 // Determines whether the given string consists entirely of valid base64
56 // encoded characters.
57 static bool IsBase64Encoded(const std::string& str);
58
59 static void EncodeFromArray(const void* data,
60 size_t len,
61 std::string* result);
62 static bool DecodeFromArray(const char* data,
63 size_t len,
64 DecodeFlags flags,
65 std::string* result,
66 size_t* data_used);
67 static bool DecodeFromArray(const char* data,
68 size_t len,
69 DecodeFlags flags,
70 std::vector<char>* result,
71 size_t* data_used);
72 static bool DecodeFromArray(const char* data,
73 size_t len,
74 DecodeFlags flags,
75 std::vector<uint8_t>* result,
76 size_t* data_used);
77
78 // Convenience Methods
79 static inline std::string Encode(const std::string& data) {
80 std::string result;
81 EncodeFromArray(data.data(), data.size(), &result);
82 return result;
83 }
84 static inline std::string Decode(const std::string& data, DecodeFlags flags) {
85 std::string result;
86 DecodeFromArray(data.data(), data.size(), flags, &result, nullptr);
87 return result;
88 }
89 static inline bool Decode(const std::string& data,
90 DecodeFlags flags,
91 std::string* result,
92 size_t* data_used) {
93 return DecodeFromArray(data.data(), data.size(), flags, result, data_used);
94 }
95 static inline bool Decode(const std::string& data,
96 DecodeFlags flags,
97 std::vector<char>* result,
98 size_t* data_used) {
99 return DecodeFromArray(data.data(), data.size(), flags, result, data_used);
100 }
101
102 private:
103 static const char Base64Table[];
104 static const unsigned char DecodeTable[];
105
106 static size_t GetNextQuantum(DecodeFlags parse_flags,
107 bool illegal_pads,
108 const char* data,
109 size_t len,
110 size_t* dpos,
111 unsigned char qbuf[4],
112 bool* padded);
113 template <typename T>
114 static bool DecodeFromArrayTemplate(const char* data,
115 size_t len,
116 DecodeFlags flags,
117 T* result,
118 size_t* data_used);
119 };
120
121 } // namespace rtc
122
123 #endif // WEBRTC_BASE_BASE64_H__
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