libjson interface added to the core

git-svn-id: http://svn.miranda-ng.org/main/trunk@573 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 136 insertions, 0 deletions

diff --git a/src/modules/json/JSON_Base64.cpp b/src/modules/json/JSON_Base64.cpp
new file mode 100644
index 0000000000..4759b112bb
--- /dev/null
+++ b/src/modules/json/JSON_Base64.cpp
@@ -0,0 +1,136 @@
+/*

+

+Miranda IM: the free IM client for Microsoft* Windows*

+

+Copyright 2000-2009 Miranda ICQ/IM project,

+all portions of this codebase are copyrighted to the people

+listed in contributors.txt.

+

+This program is free software; you can redistribute it and/or

+modify it under the terms of the GNU General Public License

+as published by the Free Software Foundation; either version 2

+of the License, or (at your option) any later version.

+

+This program is distributed in the hope that it will be useful,

+but WITHOUT ANY WARRANTY; without even the implied warranty of

+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+GNU General Public License for more details.

+

+You should have received a copy of the GNU General Public License

+along with this program; if not, write to the Free Software

+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

+*/

+

+#include "..\..\core\commonheaders.h"

+

+#include "JSON_Base64.h"
+#include "JSONDefs.h"
+
+#ifdef JSON_BINARY  //if this is not needed, don't waste space compiling it
+
+static const json_char * chars64 = JSON_TEXT("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
+#ifdef JSON_UNICODE
+    static std::string BASE64_EMPTY_STRING;
+#else
+    #define BASE64_EMPTY_STRING EMPTY_STRING
+#endif
+
+json_string JSONBase64::json_encode64(const unsigned char * binary, size_t bytes){
+    size_t misaligned = bytes % 3;
+    size_t aligned = (bytes - misaligned) / 3;  //divide by three once and inc is faster than add 3 each time
+    json_string result;
+    result.reserve((size_t)(((float)bytes) * 1.37f) + 4);
+
+    //do all of the ones that are 3 byte aligned
+    for (size_t i = 0; i < aligned; ++i){
+	   result += chars64[(binary[0] & 0xFC) >> 2];
+	   result += chars64[((binary[0] & 0x03) << 4) + ((binary[1] & 0xF0) >> 4)];
+	   result += chars64[((binary[1] & 0x0F) << 2) + ((binary[2] & 0xC0) >> 6)];
+	   result += chars64[binary[2] & 0x3F];
+	   binary += 3;
+    }
+
+    if (misaligned){
+	   //copy the rest into a temporary buffer
+	   unsigned char temp[3];
+	   for (unsigned int i = 0; i < misaligned; ++i){
+		  temp[i] = *binary++;
+	   }
+	   for (unsigned int i = (unsigned int)misaligned; i < 3; ++i){
+		  temp[i] = '\0';
+	   }
+
+	   //now do the final three bytes
+	   result += chars64[(temp[0] & 0xFC) >> 2];
+	   result += chars64[((temp[0] & 0x03) << 4) + ((temp[1] & 0xF0) >> 4)];
+	   if (misaligned == 2){
+		  result += chars64[((temp[1] & 0x0F) << 2) + ((temp[2] & 0xC0) >> 6)];
+		  result += JSON_TEXT('=');
+	   } else {
+		  result += JSON_TEXT("==");
+	   }
+    }
+    JSON_ASSERT((size_t)(((float)bytes) * 1.37f) + 4 >= result.length(), JSON_TEXT("Didn't reserve enough space for a one-time go"));
+    return result;
+}
+
+inline json_char toBinary(json_char c){
+    if (c == JSON_TEXT('+')) {
+	   return JSON_TEXT('>');
+    } else if (c == JSON_TEXT('/')) {
+	   return JSON_TEXT('?');
+    } else if (c < JSON_TEXT(':')) {
+	   return c + JSON_TEXT('\x04');
+    } else if (c < JSON_TEXT('[')) {
+	   return c - JSON_TEXT('\x41');
+    }
+    return c - 71;
+}
+
+/*
+ Must be a std::string because it's binary, and chars must be 1 byte
+ */
+std::string JSONBase64::json_decode64(const json_string & encoded){
+    const size_t length = encoded.length();
+    #if defined JSON_DEBUG || defined JSON_SAFE
+	   size_t pos = encoded.find_first_not_of(chars64);
+	   if (pos != json_string::npos){
+		  JSON_ASSERT_SAFE(encoded[pos] == JSON_TEXT('='), JSON_TEXT("Not Base64"), return BASE64_EMPTY_STRING;);
+		  if (pos != length - 1){
+			 JSON_ASSERT_SAFE(pos == length - 2, JSON_TEXT("Not Base64"), return BASE64_EMPTY_STRING;);
+			 JSON_ASSERT_SAFE(encoded[pos + 1] == JSON_TEXT('='), JSON_TEXT("Not Base64"), return BASE64_EMPTY_STRING;);
+		  }
+	   }
+    #endif
+    const json_char * runner = encoded.c_str();
+    size_t aligned = length / 4; //don't do the last ones as they might be = padding
+    std::string result;
+    if (aligned){
+	   --aligned;
+	   result.reserve((size_t)((float)length / 1.37) + 1);
+
+	   //first do the ones that can not have any padding
+	   for (unsigned int i = 0; i < aligned; ++i){
+		  const json_char second = toBinary(runner[1]);
+		  const json_char third = toBinary(runner[2]);
+		  result += (toBinary(runner[0]) << 2) + ((second & 0x30) >> 4);
+		  result += ((second & 0xf) << 4) + ((third & 0x3c) >> 2);
+		  result += ((third & 0x3) << 6) + toBinary(runner[3]);
+		  runner += 4;
+	   }
+
+	   //now do the ones that might have padding, the first two characters can not be padding, so do them quickly
+	   const char second = toBinary(runner[1]);
+	   result += (toBinary(runner[0]) << 2) + ((second & 0x30) >> 4);
+	   if (runner[2] != '=') {  //not two = pads
+		  const char third = toBinary(runner[2]);
+		  result += ((second & 0xf) << 4) + ((third & 0x3c) >> 2);
+		  if (runner[3] != '=') {  //no padding
+			 result += ((third & 0x3) << 6) + toBinary(runner[3]);
+		  }
+	   }
+    }
+    return result;
+}
+
+#endif