ReactOS 0.4.15-dev-5667-ged97270
base64_codec.c
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1/*
2 * base64 encoder/decoder
3 *
4 * Copyright 2005 by Kai Blin
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19 */
20
21#include "precomp.h"
22
23#include <wine/debug.h>
25
26static const char b64[] =
27"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
28
29SECURITY_STATUS encodeBase64(PBYTE in_buf, int in_len, char* out_buf,
30 int max_len, int *out_len)
31{
32 int div, i;
33 PBYTE d = in_buf;
34 int bytes = (in_len*8 + 5)/6, pad_bytes = (bytes % 4) ? 4 - (bytes % 4) : 0;
35
36 TRACE("bytes is %d, pad bytes is %d\n", bytes, pad_bytes);
37 *out_len = bytes + pad_bytes;
38
39 if(bytes + pad_bytes + 1 > max_len)
41
42 /* Three bytes of input give 4 chars of output */
43 div = in_len / 3;
44
45 i = 0;
46 while(div > 0)
47 {
48 /* first char is the first 6 bits of the first byte*/
49 out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
50 /* second char is the last 2 bits of the first byte and the first 4
51 * bits of the second byte */
52 out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
53 /* third char is the last 4 bits of the second byte and the first 2
54 * bits of the third byte */
55 out_buf[i + 2] = b64[ ((d[1] << 2) & 0x3c) | (d[2] >> 6 & 0x03)];
56 /* fourth char is the remaining 6 bits of the third byte */
57 out_buf[i + 3] = b64[ d[2] & 0x3f];
58 i += 4;
59 d += 3;
60 div--;
61 }
62
63 switch(pad_bytes)
64 {
65 case 1:
66 /* first char is the first 6 bits of the first byte*/
67 out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
68 /* second char is the last 2 bits of the first byte and the first 4
69 * bits of the second byte */
70 out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30) | (d[1] >> 4 & 0x0f)];
71 /* third char is the last 4 bits of the second byte padded with
72 * two zeroes */
73 out_buf[i + 2] = b64[ ((d[1] << 2) & 0x3c) ];
74 /* fourth char is a = to indicate one byte of padding */
75 out_buf[i + 3] = '=';
76 out_buf[i + 4] = 0;
77 break;
78 case 2:
79 /* first char is the first 6 bits of the first byte*/
80 out_buf[i + 0] = b64[ ( d[0] >> 2) & 0x3f ];
81 /* second char is the last 2 bits of the first byte padded with
82 * four zeroes*/
83 out_buf[i + 1] = b64[ ((d[0] << 4) & 0x30)];
84 /* third char is = to indicate padding */
85 out_buf[i + 2] = '=';
86 /* fourth char is = to indicate padding */
87 out_buf[i + 3] = '=';
88 out_buf[i + 4] = 0;
89 break;
90 default:
91 out_buf[i] = 0;
92 }
93
94 return SEC_E_OK;
95}
96
97static inline BYTE decode(char c)
98{
99 if( c >= 'A' && c <= 'Z')
100 return c - 'A';
101 if( c >= 'a' && c <= 'z')
102 return c - 'a' + 26;
103 if( c >= '0' && c <= '9')
104 return c - '0' + 52;
105 if( c == '+')
106 return 62;
107 if( c == '/')
108 return 63;
109 else
110 return 64;
111}
112
113SECURITY_STATUS decodeBase64(char *in_buf, int in_len, PBYTE out_buf,
114 int max_len, int *out_len)
115{
116 int len = in_len, i;
117 char *d = in_buf;
118 int ip0, ip1, ip2, ip3;
119
120 TRACE("in_len: %d\n", in_len);
121
122 if((in_len % 4) != 0)
123 return SEC_E_INVALID_TOKEN;
124
125 if(in_len > max_len)
127
128 i = 0;
129 while(len > 4)
130 {
131 if((ip0 = decode(d[0])) > 63)
132 return SEC_E_INVALID_TOKEN;
133 if((ip1 = decode(d[1])) > 63)
134 return SEC_E_INVALID_TOKEN;
135 if((ip2 = decode(d[2])) > 63)
136 return SEC_E_INVALID_TOKEN;
137 if((ip3 = decode(d[3])) > 63)
138 return SEC_E_INVALID_TOKEN;
139
140 out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
141 out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
142 out_buf[i + 2] = (ip2 << 6) | ip3;
143 len -= 4;
144 i += 3;
145 d += 4;
146 }
147
148 if(d[2] == '=')
149 {
150 if((ip0 = decode(d[0])) > 63)
151 return SEC_E_INVALID_TOKEN;
152 if((ip1 = decode(d[1])) > 63)
153 return SEC_E_INVALID_TOKEN;
154
155 out_buf[i] = (ip0 << 2) | (ip1 >> 4);
156 i++;
157 }
158 else if(d[3] == '=')
159 {
160 if((ip0 = decode(d[0])) > 63)
161 return SEC_E_INVALID_TOKEN;
162 if((ip1 = decode(d[1])) > 63)
163 return SEC_E_INVALID_TOKEN;
164 if((ip2 = decode(d[2])) > 63)
165 return SEC_E_INVALID_TOKEN;
166
167 out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
168 out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
169 i += 2;
170 }
171 else
172 {
173 if((ip0 = decode(d[0])) > 63)
174 return SEC_E_INVALID_TOKEN;
175 if((ip1 = decode(d[1])) > 63)
176 return SEC_E_INVALID_TOKEN;
177 if((ip2 = decode(d[2])) > 63)
178 return SEC_E_INVALID_TOKEN;
179 if((ip3 = decode(d[3])) > 63)
180 return SEC_E_INVALID_TOKEN;
181
182
183 out_buf[i + 0] = (ip0 << 2) | (ip1 >> 4);
184 out_buf[i + 1] = (ip1 << 4) | (ip2 >> 2);
185 out_buf[i + 2] = (ip2 << 6) | ip3;
186 i += 3;
187 }
188 *out_len = i;
189 return SEC_E_OK;
190}
_STLP_VENDOR_CSTD::ldiv_t div(long __x, long __y)
Definition: _cstdlib.h:137
static unsigned char bytes[4]
Definition: adnsresfilter.c:74
SECURITY_STATUS decodeBase64(char *in_buf, int in_len, PBYTE out_buf, int max_len, int *out_len)
Definition: base64_codec.c:113
static BYTE decode(char c)
Definition: base64_codec.c:97
SECURITY_STATUS encodeBase64(PBYTE in_buf, int in_len, char *out_buf, int max_len, int *out_len)
Definition: base64_codec.c:29
static const char b64[]
Definition: base64_codec.c:26
#define WINE_DEFAULT_DEBUG_CHANNEL(t)
Definition: precomp.h:23
const GLubyte * c
Definition: glext.h:8905
GLenum GLsizei len
Definition: glext.h:6722
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
#define d
Definition: ke_i.h:81
BYTE * PBYTE
Definition: pedump.c:66
LONG SECURITY_STATUS
Definition: sspi.h:34
#define TRACE(s)
Definition: solgame.cpp:4
#define SEC_E_OK
Definition: winerror.h:2356
#define SEC_E_BUFFER_TOO_SMALL
Definition: winerror.h:2937
#define SEC_E_INVALID_TOKEN
Definition: winerror.h:2917
unsigned char BYTE
Definition: xxhash.c:193