C++ nsACString::EndReading方法代码示例

bool
AppendUTF8toUTF16( const nsACString& aSource, nsAString& aDest,
                   const mozilla::fallible_t& )
  {
    nsACString::const_iterator source_start, source_end;
    CalculateUTF8Length calculator;
    copy_string(aSource.BeginReading(source_start),
                aSource.EndReading(source_end), calculator);

    uint32_t count = calculator.Length();

    // Avoid making the string mutable if we're appending an empty string
    if (count)
      {
        uint32_t old_dest_length = aDest.Length();

        // Grow the buffer if we need to.
        if (!aDest.SetLength(old_dest_length + count, mozilla::fallible_t())) {
          return false;
        }

        // All ready? Time to convert

        ConvertUTF8toUTF16 converter(aDest.BeginWriting() + old_dest_length);
        copy_string(aSource.BeginReading(source_start),
                    aSource.EndReading(source_end), converter);

        NS_ASSERTION(converter.ErrorEncountered() ||
                     converter.Length() == count,
                     "CalculateUTF8Length produced the wrong length");

        if (converter.ErrorEncountered())
          {
            NS_ERROR("Input wasn't UTF8 or incorrect length was calculated");
            aDest.SetLength(old_dest_length);
          }
      }

    return true;
  }

void
URLParams::ParseInput(const nsACString& aInput)
{
  // Remove all the existing data before parsing a new input.
  DeleteAll();

  nsACString::const_iterator start, end;
  aInput.BeginReading(start);
  aInput.EndReading(end);
  nsACString::const_iterator iter(start);

  while (start != end) {
    nsAutoCString string;

    if (FindCharInReadable('&', iter, end)) {
      string.Assign(Substring(start, iter));
      start = ++iter;
    } else {
      string.Assign(Substring(start, end));
      start = end;
    }

    if (string.IsEmpty()) {
      continue;
    }

    nsACString::const_iterator eqStart, eqEnd;
    string.BeginReading(eqStart);
    string.EndReading(eqEnd);
    nsACString::const_iterator eqIter(eqStart);

    nsAutoCString name;
    nsAutoCString value;

    if (FindCharInReadable('=', eqIter, eqEnd)) {
      name.Assign(Substring(eqStart, eqIter));

      ++eqIter;
      value.Assign(Substring(eqIter, eqEnd));
    } else {
      name.Assign(string);
    }

    nsAutoString decodedName;
    DecodeString(name, decodedName);

    nsAutoString decodedValue;
    DecodeString(value, decodedValue);

    Append(decodedName, decodedValue);
  }
}

void
URLSearchParams::DecodeString(const nsACString& aInput, nsACString& aOutput)
{
  nsACString::const_iterator start, end;
  aInput.BeginReading(start);
  aInput.EndReading(end);

  while (start != end) {
    // replace '+' with U+0020
    if (*start == '+') {
      aOutput.Append(' ');
      ++start;
      continue;
    }

    // Percent decode algorithm
    if (*start == '%') {
      nsACString::const_iterator first(start);
      ++first;

      nsACString::const_iterator second(first);
      ++second;

#define ASCII_HEX_DIGIT( x )    \
  ((x >= 0x41 && x <= 0x46) ||  \
   (x >= 0x61 && x <= 0x66) ||  \
   (x >= 0x30 && x <= 0x39))

#define HEX_DIGIT( x )              \
   (*x >= 0x30 && *x <= 0x39        \
     ? *x - 0x30                    \
     : (*x >= 0x41 && *x <= 0x46    \
        ? *x - 0x37                 \
        : *x - 0x57))

      if (first != end && second != end &&
          ASCII_HEX_DIGIT(*first) && ASCII_HEX_DIGIT(*second)) {
        aOutput.Append(HEX_DIGIT(first) * 16 + HEX_DIGIT(second));
        start = ++second;
        continue;

      } else {
        aOutput.Append('%');
        ++start;
        continue;
      }
    }

    aOutput.Append(*start);
    ++start;
  }
}

void ReverseString(const nsACString& aSource, nsACString& aResult) {
  nsACString::const_iterator sourceBegin, sourceEnd;
  aSource.BeginReading(sourceBegin);
  aSource.EndReading(sourceEnd);

  aResult.SetLength(aSource.Length());
  auto destEnd = aResult.EndWriting();

  while (sourceBegin != sourceEnd) {
    *(--destEnd) = *sourceBegin;
    ++sourceBegin;
  }
}

NS_IMETHODIMP
nsLocalFile::SetRelativeDescriptor(nsIFile* aFromFile,
                                   const nsACString& aRelativeDesc)
{
  NS_NAMED_LITERAL_CSTRING(kParentDirStr, "../");

  nsCOMPtr<nsIFile> targetFile;
  nsresult rv = aFromFile->Clone(getter_AddRefs(targetFile));
  if (NS_FAILED(rv)) {
    return rv;
  }

  //
  // aRelativeDesc is UTF-8 encoded
  //

  nsCString::const_iterator strBegin, strEnd;
  aRelativeDesc.BeginReading(strBegin);
  aRelativeDesc.EndReading(strEnd);

  nsCString::const_iterator nodeBegin(strBegin), nodeEnd(strEnd);
  nsCString::const_iterator pos(strBegin);

  nsCOMPtr<nsIFile> parentDir;
  while (FindInReadable(kParentDirStr, nodeBegin, nodeEnd)) {
    rv = targetFile->GetParent(getter_AddRefs(parentDir));
    if (NS_FAILED(rv)) {
      return rv;
    }
    if (!parentDir) {
      return NS_ERROR_FILE_UNRECOGNIZED_PATH;
    }
    targetFile = parentDir;

    nodeBegin = nodeEnd;
    pos = nodeEnd;
    nodeEnd = strEnd;
  }

  nodeBegin = nodeEnd = pos;
  while (nodeEnd != strEnd) {
    FindCharInReadable('/', nodeEnd, strEnd);
    targetFile->Append(NS_ConvertUTF8toUTF16(Substring(nodeBegin, nodeEnd)));
    if (nodeEnd != strEnd) { // If there's more left in the string, inc over the '/' nodeEnd is on.
      ++nodeEnd;
    }
    nodeBegin = nodeEnd;
  }

  return InitWithFile(targetFile);
}

// copy aSource strings into contiguous storage provided in aDest1,
// providing terminating nulls for each destination string.
static inline void
StrBlockCopy(const nsACString &aSource1,
             const nsACString &aSource2,
             const nsACString &aSource3,
             const nsACString &aSource4,
             char             *&aDest1,
             char             *&aDest2,
             char             *&aDest3,
             char             *&aDest4,
             char             *&aDestEnd)
{
  char *toBegin = aDest1;
  nsACString::const_iterator fromBegin, fromEnd;

  *copy_string(aSource1.BeginReading(fromBegin), aSource1.EndReading(fromEnd), toBegin) = char(0);
  aDest2 = ++toBegin;
  *copy_string(aSource2.BeginReading(fromBegin), aSource2.EndReading(fromEnd), toBegin) = char(0);
  aDest3 = ++toBegin;
  *copy_string(aSource3.BeginReading(fromBegin), aSource3.EndReading(fromEnd), toBegin) = char(0);
  aDest4 = ++toBegin;
  *copy_string(aSource4.BeginReading(fromBegin), aSource4.EndReading(fromEnd), toBegin) = char(0);
  aDestEnd = toBegin;
}

nsresult nsIDNService::ACEtoUTF8(const nsACString & input, nsACString & _retval,
                                 stringPrepFlag flag)
{
  // RFC 3490 - 4.2 ToUnicode
  // ToUnicode never fails.  If any step fails, then the original input
  // sequence is returned immediately in that step.
  //
  // Note that this refers to the decoding of a single label.
  // ACEtoUTF8 may be called with a sequence of labels separated by dots;
  // this test applies individually to each label.

  uint32_t len = 0, offset = 0;
  nsAutoCString decodedBuf;

  nsACString::const_iterator start, end;
  input.BeginReading(start);
  input.EndReading(end);
  _retval.Truncate();

  // loop and decode nodes
  while (start != end) {
    len++;
    if (*start++ == '.') {
      nsDependentCSubstring origLabel(input, offset, len - 1);
      if (NS_FAILED(decodeACE(origLabel, decodedBuf, flag))) {
        // If decoding failed, use the original input sequence
        // for this label.
        _retval.Append(origLabel);
      } else {
        _retval.Append(decodedBuf);
      }

      _retval.Append('.');
      offset += len;
      len = 0;
    }
  }
  // decode the last node
  if (len) {
    nsDependentCSubstring origLabel(input, offset, len);
    if (NS_FAILED(decodeACE(origLabel, decodedBuf, flag))) {
      _retval.Append(origLabel);
    } else {
      _retval.Append(decodedBuf);
    }
  }

  return NS_OK;
}

nsresult
SubstitutingProtocolHandler::NewURI(const nsACString &aSpec,
                                    const char *aCharset,
                                    nsIURI *aBaseURI,
                                    nsIURI **result)
{
  nsresult rv;

  RefPtr<SubstitutingURL> url = new SubstitutingURL();
  if (!url)
    return NS_ERROR_OUT_OF_MEMORY;

  // unescape any %2f and %2e to make sure nsStandardURL coalesces them.
  // Later net_GetFileFromURLSpec() will do a full unescape and we want to
  // treat them the same way the file system will. (bugs 380994, 394075)
  nsAutoCString spec;
  const char *src = aSpec.BeginReading();
  const char *end = aSpec.EndReading();
  const char *last = src;

  spec.SetCapacity(aSpec.Length()+1);
  for ( ; src < end; ++src) {
    if (*src == '%' && (src < end-2) && *(src+1) == '2') {
      char ch = '\0';
      if (*(src+2) == 'f' || *(src+2) == 'F') {
        ch = '/';
      } else if (*(src+2) == 'e' || *(src+2) == 'E') {
        ch = '.';
      }

      if (ch) {
        if (last < src) {
          spec.Append(last, src-last);
        }
        spec.Append(ch);
        src += 2;
        last = src+1; // src will be incremented by the loop
      }
    }
  }
  if (last < src)
    spec.Append(last, src-last);

  rv = url->Init(nsIStandardURL::URLTYPE_STANDARD, -1, spec, aCharset, aBaseURI);
  if (NS_SUCCEEDED(rv)) {
    url.forget(result);
  }
  return rv;
}

NS_IMETHODIMP
nsResProtocolHandler::NewURI(const nsACString &aSpec,
                             const char *aCharset,
                             nsIURI *aBaseURI,
                             nsIURI **result)
{
    nsresult rv;

    nsResURL *resURL = new nsResURL();
    if (!resURL)
        return NS_ERROR_OUT_OF_MEMORY;
    NS_ADDREF(resURL);

    // unescape any %2f and %2e to make sure nsStandardURL coalesces them.
    // Later net_GetFileFromURLSpec() will do a full unescape and we want to
    // treat them the same way the file system will. (bugs 380994, 394075)
    nsCAutoString spec;
    const char *src = aSpec.BeginReading();
    const char *end = aSpec.EndReading();
    const char *last = src;

    spec.SetCapacity(aSpec.Length()+1);
    for ( ; src < end; ++src) {
        if (*src == '%' && (src < end-2) && *(src+1) == '2') {
           char ch = '\0';
           if (*(src+2) == 'f' || *(src+2) == 'F')
             ch = '/';
           else if (*(src+2) == 'e' || *(src+2) == 'E')
             ch = '.';

           if (ch) {
             if (last < src)
               spec.Append(last, src-last);
             spec.Append(ch);
             src += 2;
             last = src+1; // src will be incremented by the loop
           }
        }
    }
    if (last < src)
      spec.Append(last, src-last);

    rv = resURL->Init(nsIStandardURL::URLTYPE_STANDARD, -1, spec, aCharset, aBaseURI);
    if (NS_SUCCEEDED(rv))
        rv = CallQueryInterface(resURL, result);
    NS_RELEASE(resURL);
    return rv;
}

// static
bool
nsHttp::IsReasonableHeaderValue(const nsACString &s)
{
  // Header values MUST NOT contain line-breaks.  RFC 2616 technically
  // permits CTL characters, including CR and LF, in header values provided
  // they are quoted.  However, this can lead to problems if servers do not
  // interpret quoted strings properly.  Disallowing CR and LF here seems
  // reasonable and keeps things simple.  We also disallow a null byte.
  const nsACString::char_type* end = s.EndReading();
  for (const nsACString::char_type* i = s.BeginReading(); i != end; ++i) {
    if (*i == '\r' || *i == '\n' || *i == '\0') {
      return false;
    }
  }
  return true;
}

static bool pathBeginsWithVolName(const nsACString& path, nsACString& firstPathComponent)
{
  // Return whether the 1st path component in path (escaped) is equal to the name
  // of a mounted volume. Return the 1st path component (unescaped) in any case.
  // This needs to be done as quickly as possible, so we cache a list of volume names.
  // XXX Register an event handler to detect drives being mounted/unmounted?
  
  if (!gVolumeList) {
    gVolumeList = new nsTArray<nsCString>;
    if (!gVolumeList) {
      return false; // out of memory
    }
  }

  // Cache a list of volume names
  if (!gVolumeList->Length()) {
    OSErr err;
    ItemCount volumeIndex = 1;
    
    do {
      HFSUniStr255 volName;
      FSRef rootDirectory;
      err = ::FSGetVolumeInfo(0, volumeIndex, NULL, kFSVolInfoNone, NULL, &volName, &rootDirectory);
      if (err == noErr) {
        NS_ConvertUTF16toUTF8 volNameStr(Substring((PRUnichar *)volName.unicode,
                                                   (PRUnichar *)volName.unicode + volName.length));
        gVolumeList->AppendElement(volNameStr);
        volumeIndex++;
      }
    } while (err == noErr);
  }
  
  // Extract the first component of the path
  nsACString::const_iterator start;
  path.BeginReading(start);
  start.advance(1); // path begins with '/'
  nsACString::const_iterator directory_end;
  path.EndReading(directory_end);
  nsACString::const_iterator component_end(start);
  FindCharInReadable('/', component_end, directory_end);
  
  nsCAutoString flatComponent((Substring(start, component_end)));
  NS_UnescapeURL(flatComponent);
  PRInt32 foundIndex = gVolumeList->IndexOf(flatComponent);
  firstPathComponent = flatComponent;
  return (foundIndex != -1);
}

nsresult nsIDNService::ACEtoUTF8(const nsACString & input, nsACString & _retval,
                                 bool allowUnassigned)
{
  // RFC 3490 - 4.2 ToUnicode
  // ToUnicode never fails.  If any step fails, then the original input
  // sequence is returned immediately in that step.

  if (!IsASCII(input)) {
    _retval.Assign(input);
    return NS_OK;
  }
  
  uint32_t len = 0, offset = 0;
  nsAutoCString decodedBuf;

  nsACString::const_iterator start, end;
  input.BeginReading(start); 
  input.EndReading(end); 
  _retval.Truncate();

  // loop and decode nodes
  while (start != end) {
    len++;
    if (*start++ == '.') {
      if (NS_FAILED(decodeACE(Substring(input, offset, len - 1), decodedBuf,
                              allowUnassigned))) {
        _retval.Assign(input);
        return NS_OK;
      }

      _retval.Append(decodedBuf);
      _retval.Append('.');
      offset += len;
      len = 0;
    }
  }
  // decode the last node
  if (len) {
    if (NS_FAILED(decodeACE(Substring(input, offset, len), decodedBuf,
                            allowUnassigned)))
      _retval.Assign(input);
    else
      _retval.Append(decodedBuf);
  }

  return NS_OK;
}

static void
SplitTables(const nsACString& str, nsTArray<nsCString>& tables)
{
  tables.Clear();

  nsACString::const_iterator begin, iter, end;
  str.BeginReading(begin);
  str.EndReading(end);
  while (begin != end) {
    iter = begin;
    FindCharInReadable(',', iter, end);
    tables.AppendElement(Substring(begin, iter));
    begin = iter;
    if (begin != end)
      begin++;
  }
}

bool
nsPicoService::GetVoiceFileLanguage(const nsACString& aFileName, nsAString& aLang)
{
  nsACString::const_iterator start, end;
  aFileName.BeginReading(start);
  aFileName.EndReading(end);

  // The lingware filename syntax is language_(ta/sg).bin,
  // we extract the language prefix here.
  if (FindInReadable(NS_LITERAL_CSTRING("_"), start, end)) {
    end = start;
    aFileName.BeginReading(start);
    aLang.Assign(NS_ConvertUTF8toUTF16(Substring(start, end)));
    return true;
  }

  return false;
}

uint32_t
CountCharInReadable(const nsACString& aStr, char aChar)
{
  uint32_t count = 0;
  nsACString::const_iterator begin, end;

  aStr.BeginReading(begin);
  aStr.EndReading(end);

  while (begin != end) {
    if (*begin == aChar) {
      ++count;
    }
    ++begin;
  }

  return count;
}