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-rw-r--r--src/base64.cpp132
1 files changed, 132 insertions, 0 deletions
diff --git a/src/base64.cpp b/src/base64.cpp
new file mode 100644
index 0000000..723788b
--- /dev/null
+++ b/src/base64.cpp
@@ -0,0 +1,132 @@
1#include "bu/base64.h"
2
3const char Bu::Base64::tblEnc[65] = {
4 "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
5};
6
7Bu::Base64::Base64( Bu::Stream &rNext, Mode eMode ) :
8 Bu::Filter( rNext ),
9 iBPos( 0 ),
10 iBuf( 0 ),
11 iTotalIn( 0 ),
12 iTotalOut( 0 ),
13 eMode( eMode )
14{
15 start();
16
17 memset( tblDec, 0, 80 );
18 for( int j = 0; j < 64; j++ )
19 {
20 tblDec[tblEnc[j]-'+'] = j;
21 // printf("'%c' = %d\n", tblEnc[j], j );
22 }
23 /*
24 for( int j = 0; j < 64; j++ )
25 {
26 printf("'%c' = '%c' (%d = %d)\n",
27 tblEnc[j], tblEnc[tblDec[tblEnc[j]-'+']],
28 j, tblDec[tblEnc[j]-'+'] );
29 }*/
30
31 // The following is used to compute the table size for the decoding table.
32 /*
33 char low='A', high='A';
34 for( int j = 0; j < 64; j++ )
35 {
36 if( tblEnc[j] < low )
37 low = tblEnc[j];
38 if( tblEnc[j] > high )
39 high = tblEnc[j];
40 }
41
42 printf("'%c' - '%c' (%d - %d) (%d)\n", low, high, low, high, high-low );
43 */
44}
45
46Bu::Base64::~Base64()
47{
48 stop();
49}
50
51void Bu::Base64::start()
52{
53}
54
55size_t Bu::Base64::stop()
56{
57 if( eMode == Write )
58 {
59 char outBuf[4];
60 int iBUsed = 4-(3-iBPos);
61 if( iBPos == 0 )
62 return iTotalOut;
63 for( int k = 0; k < 4; k++ )
64 {
65 outBuf[3-k] = tblEnc[(iBuf>>(6*k))&0x3f];
66 }
67 for( int k = iBUsed; k < 4; k++ )
68 {
69 outBuf[k] = '=';
70 }
71 iTotalOut += rNext.write( outBuf, 4 );
72 return iTotalOut;
73 }
74 else
75 {
76 return iTotalIn;
77 }
78}
79
80size_t Bu::Base64::read( void *pBuf, size_t nBytes )
81{
82 size_t sIn = 0;
83 char buf[4];
84 while( sIn < nBytes )
85 {
86 if( rNext.read( buf, 4 ) == 0 )
87 return sIn;
88 int iChars = 3;
89 for( int j = 0; j < 4; j++ )
90 {
91 if( buf[j] == '=' )
92 iChars--;
93 else
94 iBuf |= (tblDec[buf[j]-'+']&0x3f)<<((3-j)*6);
95 printf("%d: %06X (%02X)\n", j, iBuf, (tblDec[buf[j]-'+']&0x3f) );
96 }
97 for( int j = 0; j < iChars; j++ )
98 {
99 ((unsigned char *)pBuf)[sIn++] = (iBuf>>(8*(2-j)))&0xFF;
100 }
101 iBuf = 0;
102 }
103
104 return sIn;
105}
106
107size_t Bu::Base64::write( const void *pBuf, size_t nBytes )
108{
109 size_t sOut = 0;
110 char outBuf[4];
111 for( size_t j = 0; j < nBytes; j++ )
112 {
113 iBuf |= (((uint8_t *)pBuf)[j])<<((2-iBPos++)*8);
114 if( iBPos == 3 )
115 {
116 for( int k = 0; k < 4; k++ )
117 {
118 outBuf[3-k] = tblEnc[(iBuf>>(6*k))&0x3f];
119 }
120 sOut += rNext.write( outBuf, 4 );
121 iBPos = iBuf = 0;
122 }
123 }
124 iTotalOut += sOut;
125 return sOut;
126}
127
128bool Bu::Base64::isOpen()
129{
130 return true;
131}
132