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cmText.c : Implemented cmTextEncodeBase64().

master
Kevin Larke преди 9 години
родител
ревизия
fd59f5ae69
променени са 1 файла, в които са добавени 62 реда и са изтрити 4 реда
  1. 62
    4
      cmText.c

+ 62
- 4
cmText.c Целия файл

@@ -1192,6 +1192,8 @@ cmTxRC_t cmTextDecodeBase64( const char* xV, unsigned xN, void* yV, unsigned yN
1192 1192
       --yn;
1193 1193
 
1194 1194
     unsigned v = 0;
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+
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+    assert( i + 4 <= xN );
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1196 1198
     v += t[(int)xV[i++]] << 18;
1197 1199
     v += t[(int)xV[i++]] << 12;
@@ -1227,11 +1229,67 @@ cmTxRC_t cmTextDecodeBase64( const char* xV, unsigned xN, void* yV, unsigned yN
1227 1229
 
1228 1230
 unsigned cmTextEncodeBase64BufferByteCount( unsigned binByteCnt )
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 {
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-  return 0;
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+  int rem = binByteCnt % 3;
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+  binByteCnt -= rem;
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+
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+  int n = binByteCnt / 3 * 4;
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+
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+  if( rem )
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+    n += 4;
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+
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+  return n;
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+  
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 }
1232 1243
 
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-cmTxRC_t cmTextEncodeBase64( const void* xV, unsigned xN, char* yV, unsigned yN )
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+unsigned cmTextEncodeBase64( const void* xV, unsigned xN, char* yV, unsigned yN )
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 {
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-  // const char* t = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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-  return kOkTxRC;
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+  const char*  t = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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+  const char* zV = (const char*)xV;
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+  unsigned     i = 0;
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+  unsigned     j = 0;
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+  
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+  while( 1 )
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+  {
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+    unsigned k = 3;
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+    unsigned v = ((int)zV[i++]) << 16;
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+
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+    if( i < xN )
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+      v += ((int)zV[i++]) << 8;
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+    else
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+      --k;
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+
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+    if( i < xN )
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+      v += ((int)zV[i++]);
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+    else
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+      --k;
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+
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+    if( j >= yN )
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+      break;
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+    
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+    yV[j++] = t[ (v & 0xfc0000) >> 18 ];
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+
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+    if( j >= yN )
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+      break;
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+    
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+    yV[j++] = t[ (v & 0x03f000) >> 12 ];
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+
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+    if( j >= yN )
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+      break;
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+    
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+    if( k > 1 )
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+      yV[j++] = t[ (v & 0x000fc0) >>  6 ];
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+    else
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+      yV[j++] = '=';
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+
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+    if( j >= yN )
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+      break;
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+    
1287
+    if( k > 2 )
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+      yV[j++] = t[ (v & 0x00003f) >>  0 ];
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+    else
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+      yV[j++] = '=';
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+    
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+  }
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+  
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+  return j;
1237 1295
 }

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