281 lines
9 KiB
C++
281 lines
9 KiB
C++
/*
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*
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* @APPLE_LICENSE_HEADER_START@
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*
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* Copyright (c) 1999-2008 Apple Inc. All Rights Reserved.
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this
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* file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_LICENSE_HEADER_END@
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*
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*/
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/*
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File: StringTranslator.cpp
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Contains: implements StringTranslator class
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*/
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#include <string.h>
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#include <ctype.h>
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#include <stdio.h>
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#include "StringTranslator.h"
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#include "MyAssert.h"
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#include "SafeStdLib.h"
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#include <errno.h>
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SInt32 StringTranslator::DecodeURL(const char* inSrc, SInt32 inSrcLen, char* ioDest, SInt32 inDestLen)
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{
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// return the number of chars written to ioDest
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// or OS_BadURLFormat in the case of any error.
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// inSrcLen must be > inSrcLen and the first character must be a '/'
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if ( inSrcLen <= 0 || *inSrc != '/' )
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return OS_BadURLFormat;
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//Assert(*inSrc == '/'); //For the purposes of '..' stripping, we assume first char is a /
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SInt32 theLengthWritten = 0;
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int tempChar = 0;
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int numDotChars = 0;
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Bool16 inQuery = false;
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while (inSrcLen > 0)
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{
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if (theLengthWritten == inDestLen)
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return OS_NotEnoughSpace;
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if (*inSrc == '?')
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inQuery = true;
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if (*inSrc == '%')
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{
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if (inSrcLen < 3)
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return OS_BadURLFormat;
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//if there is a special character in this URL, extract it
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char tempbuff[3];
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inSrc++;
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if (!isxdigit(*inSrc))
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return OS_BadURLFormat;
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tempbuff[0] = *inSrc;
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inSrc++;
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if (!isxdigit(*inSrc))
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return OS_BadURLFormat;
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tempbuff[1] = *inSrc;
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inSrc++;
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tempbuff[2] = '\0';
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sscanf(tempbuff, "%x", &tempChar);
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Assert(tempChar < 256);
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inSrcLen -= 3;
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}
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else if (*inSrc == '\0')
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return OS_BadURLFormat;
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else
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{
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// Any normal character just gets copied into the destination buffer
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tempChar = *inSrc;
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inSrcLen--;
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inSrc++;
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}
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if (!inQuery) // don't do seperator parsing or .. parsing in query
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{
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//
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// If we are in a file system that uses a character besides '/' as a
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// path delimiter, we should not allow this character to appear in the URL.
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// In URLs, only '/' has control meaning.
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if ((tempChar == kPathDelimiterChar) && (kPathDelimiterChar != '/'))
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return OS_BadURLFormat;
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// Check to see if this character is a path delimiter ('/')
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// If so, we need to further check whether backup is required due to
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// dot chars that need to be stripped
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if ((tempChar == '/') && (numDotChars <= 2) && (numDotChars > 0))
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{
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Assert(theLengthWritten > numDotChars);
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ioDest -= (numDotChars + 1);
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theLengthWritten -= (numDotChars + 1);
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}
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*ioDest = tempChar;
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// Note that because we are doing this dotchar check here, we catch dotchars
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// even if they were encoded to begin with.
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// If this is a . , check to see if it's one of those cases where we need to track
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// how many '.'s in a row we've gotten, for stripping out later on
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if (*ioDest == '.')
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{
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Assert(theLengthWritten > 0);//first char is always '/', right?
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if ((numDotChars == 0) && (*(ioDest - 1) == '/'))
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numDotChars++;
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else if ((numDotChars > 0) && (*(ioDest - 1) == '.'))
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numDotChars++;
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}
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// If this isn't a dot char, we don't care at all, reset this value to 0.
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else
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numDotChars = 0;
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}
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else
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*ioDest = tempChar;
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theLengthWritten++;
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ioDest++;
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}
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// Before returning, "strip" any trailing "." or ".." by adjusting "theLengthWritten
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// accordingly
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if (numDotChars <= 2)
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theLengthWritten -= numDotChars;
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return theLengthWritten;
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}
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SInt32 StringTranslator::EncodeURL(const char* inSrc, SInt32 inSrcLen, char* ioDest, SInt32 inDestLen)
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{
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// return the number of chars written to ioDest
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SInt32 theLengthWritten = 0;
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while (inSrcLen > 0)
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{
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if (theLengthWritten == inDestLen)
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return OS_NotEnoughSpace;
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//
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// Always encode 8-bit characters
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if ((unsigned char)*inSrc > 127)
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{
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if (inDestLen - theLengthWritten < 3)
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return OS_NotEnoughSpace;
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qtss_sprintf(ioDest,"%%%X",(unsigned char)*inSrc);
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ioDest += 3;
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theLengthWritten += 3;
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inSrc++;
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inSrcLen--;
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continue;
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}
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//
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// Only encode certain 7-bit characters
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switch (*inSrc)
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{
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// This is the URL RFC list of illegal characters.
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case (' '):
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case ('\r'):
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case ('\n'):
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case ('\t'):
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case ('<'):
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case ('>'):
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case ('#'):
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case ('%'):
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case ('{'):
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case ('}'):
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case ('|'):
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case ('\\'):
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case ('^'):
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case ('~'):
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case ('['):
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case (']'):
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case ('`'):
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case (';'):
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// case ('/'): // this isn't really an illegal character, it's legitimatly used as a seperator in the url
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case ('?'):
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case ('@'):
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case ('='):
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case ('&'):
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case ('$'):
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case ('"'):
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{
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if ((inDestLen - theLengthWritten) < 3)
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return OS_NotEnoughSpace;
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qtss_sprintf(ioDest,"%%%X",(int)*inSrc);
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ioDest += 3;
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theLengthWritten += 3;
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break;
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}
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default:
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{
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*ioDest = *inSrc;
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ioDest++;
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theLengthWritten++;
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}
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}
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inSrc++;
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inSrcLen--;
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}
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return theLengthWritten;
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}
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void StringTranslator::DecodePath(char* inSrc, UInt32 inSrcLen)
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{
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for (UInt32 x = 0; x < inSrcLen; x++)
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if (inSrc[x] == '/')
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inSrc[x] = kPathDelimiterChar;
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}
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#if STRINGTRANSLATORTESTING
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Bool16 StringTranslator::Test()
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{
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//static char* test1 = "/%5D%3f%7eAveryweird%7C/and/long/path/ya/%5d%3F%7eAveryweird%7C/and/long/p%40/ya/%5D%3F%7EAveryweird%7C/and/long/path/ya/%5D%3F%7EAveryweird%7C/and/long/path/ya/%2560%2526a%20strange%3B%23%3D%25filename"
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static char dest[1000];
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static char* test1 = "/Hello%23%20 I want%28don't%29";
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SInt32 err = DecodeURL(test1, strlen(test1), dest, 1000);
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if (err != 22)
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return false;
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if (strcmp(dest, "/Hello# I want(don't)") != 0)
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return false;
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err = DecodeURL(test1, 15, dest, 1000);
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if (err != 11)
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return false;
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if (strncmp(dest, "/Hello# I ", 11) != 0)
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return false;
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err = DecodeURL(test1, 50, dest, 1000);
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if (err != OS_BadURLFormat)
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return false;
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if (strncmp(dest, "/Hello# I want(don't)", 22) != 0)
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if (strcmp(dest, "/Hello# I want(don't)") != 0)
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return false;
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err = DecodeURL(test1, strlen(test1), dest, 20);
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if (err != OS_BadURLFormat)
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return false;
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static char* test2 = "/THis%2h is a bad %28 URL!";
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err = DecodeURL(test2, strlen(test2), dest, 1000);
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if (err != OS_BadURLFormat)
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return false;
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static char* test3 = "/...whoa/../is./meeee%3e/./";
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static char* test4 = "/I want/to/sleep/..";
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static char* test5 = "/ve....rr/tire.././../..";
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static char* test6 = "/../beginnings/and/.";
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static char* test7 = "/../begin/%2e./../nin/%2e/gs/an/%2e%2e/fklf/%2e%2e./dfds%2e/%2e%2e/d/.%2e";
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err = DecodeURL(test3, strlen(test3), dest, 1000);
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err = DecodeURL(test4, strlen(test4), dest, 1000);
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err = DecodeURL(test5, strlen(test5), dest, 1000);
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err = DecodeURL(test6, strlen(test6), dest, 1000);
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err = DecodeURL(test7, strlen(test7), dest, 1000);
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return true;
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}
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#endif
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