The Tor Browser: netwerk/base/src/nsMediaFragmentURIParser.cpp@b8a032363ba2 (annotated)

netwerk/base/src/nsMediaFragmentURIParser.cpp@b8a032363ba2 (annotated)

netwerk/base/src/nsMediaFragmentURIParser.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 et cindent: */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include "nsTArray.h"
 #include "nsCharSeparatedTokenizer.h"
 #include "nsEscape.h"
 #include "nsIURI.h"
 #include <utility>
 #include "nsMediaFragmentURIParser.h"
 using std::pair;
 using std::make_pair;
 namespace mozilla { namespace net {
 nsMediaFragmentURIParser::nsMediaFragmentURIParser(nsIURI* aURI)
   : mClipUnit(eClipUnit_Pixel)
 {
   nsAutoCString ref;
   aURI->GetRef(ref);
   Parse(ref);
 }
 nsMediaFragmentURIParser::nsMediaFragmentURIParser(nsCString& aRef)
   : mClipUnit(eClipUnit_Pixel)
 {
   Parse(aRef);
 }
 bool nsMediaFragmentURIParser::ParseNPT(nsDependentSubstring aString)
 {
   nsDependentSubstring original(aString);
   if (aString.Length() > 4 &&
       aString[0] == 'n' && aString[1] == 'p' &&
       aString[2] == 't' && aString[3] == ':') {
     aString.Rebind(aString, 4);
   }
   if (aString.Length() == 0) {
     return false;
   }
   double start = -1.0;
   double end = -1.0;
   ParseNPTTime(aString, start);
   if (aString.Length() == 0) {
     mStart.construct(start);
     return true;
   }
   if (aString[0] != ',') {
     aString.Rebind(original, 0);
     return false;
   }
   aString.Rebind(aString, 1);
   if (aString.Length() == 0) {
     aString.Rebind(original, 0);
     return false;
   }
   ParseNPTTime(aString, end);
   if (end <= start || aString.Length() != 0) {
     aString.Rebind(original, 0);
     return false;
   }
   mStart.construct(start);
   mEnd.construct(end);
   return true;
 }
 bool nsMediaFragmentURIParser::ParseNPTTime(nsDependentSubstring& aString, double& aTime)
 {
   if (aString.Length() == 0) {
     return false;
   }
   return
     ParseNPTHHMMSS(aString, aTime) ||
     ParseNPTMMSS(aString, aTime) ||
     ParseNPTSec(aString, aTime);
 }
 // Return true if the given character is a numeric character
 static bool IsDigit(nsDependentSubstring::char_type aChar)
 {
   return (aChar >= '0' && aChar <= '9');
 }
 // Return the index of the first character in the string that is not
 // a numerical digit, starting from 'aStart'.
 static uint32_t FirstNonDigit(nsDependentSubstring& aString, uint32_t aStart)
 {
    while (aStart < aString.Length() && IsDigit(aString[aStart])) {
     ++aStart;
   }
   return aStart;
 }
 bool nsMediaFragmentURIParser::ParseNPTSec(nsDependentSubstring& aString, double& aSec)
 {
   nsDependentSubstring original(aString);
   if (aString.Length() == 0) {
     return false;
   }
   uint32_t index = FirstNonDigit(aString, 0);
   if (index == 0) {
     return false;
   }
   nsDependentSubstring n(aString, 0, index);
   nsresult ec;
   int32_t s = PromiseFlatString(n).ToInteger(&ec);
   if (NS_FAILED(ec)) {
     return false;
   }
   aString.Rebind(aString, index);
   double fraction = 0.0;
   if (!ParseNPTFraction(aString, fraction)) {
     aString.Rebind(original, 0);
     return false;
   }
   aSec = s + fraction;
   return true;
 }
 bool nsMediaFragmentURIParser::ParseNPTMMSS(nsDependentSubstring& aString, double& aTime)
 {
   nsDependentSubstring original(aString);
   uint32_t mm = 0;
   uint32_t ss = 0;
   double fraction = 0.0;
   if (!ParseNPTMM(aString, mm)) {
     aString.Rebind(original, 0);
     return false;
   }
   if (aString.Length() < 2 || aString[0] != ':') {
     aString.Rebind(original, 0);
     return false;
   }
   aString.Rebind(aString, 1);
   if (!ParseNPTSS(aString, ss)) {
     aString.Rebind(original, 0);
     return false;
   }
   if (!ParseNPTFraction(aString, fraction)) {
     aString.Rebind(original, 0);
     return false;
   }
   aTime = mm * 60 + ss + fraction;
   return true;
 }
 bool nsMediaFragmentURIParser::ParseNPTFraction(nsDependentSubstring& aString, double& aFraction)
 {
   double fraction = 0.0;
   if (aString.Length() > 0 && aString[0] == '.') {
     uint32_t index = FirstNonDigit(aString, 1);
     if (index > 1) {
       nsDependentSubstring number(aString, 0, index);
       nsresult ec;
       fraction = PromiseFlatString(number).ToDouble(&ec);
       if (NS_FAILED(ec)) {
         return false;
       }
     }
     aString.Rebind(aString, index);
   }
   aFraction = fraction;
   return true;
 }
 bool nsMediaFragmentURIParser::ParseNPTHHMMSS(nsDependentSubstring& aString, double& aTime)
 {
   nsDependentSubstring original(aString);
   uint32_t hh = 0;
   double seconds = 0.0;
   if (!ParseNPTHH(aString, hh)) {
     return false;
   }
   if (aString.Length() < 2 || aString[0] != ':') {
     aString.Rebind(original, 0);
     return false;
   }
   aString.Rebind(aString, 1);
   if (!ParseNPTMMSS(aString, seconds)) {
     aString.Rebind(original, 0);
     return false;
   }
   aTime = hh * 3600 + seconds;
   return true;
 }
 bool nsMediaFragmentURIParser::ParseNPTHH(nsDependentSubstring& aString, uint32_t& aHour)
 {
   if (aString.Length() == 0) {
     return false;
   }
   uint32_t index = FirstNonDigit(aString, 0);
   if (index == 0) {
     return false;
   }
   nsDependentSubstring n(aString, 0, index);
   nsresult ec;
   int32_t u = PromiseFlatString(n).ToInteger(&ec);
   if (NS_FAILED(ec)) {
     return false;
   }
   aString.Rebind(aString, index);
   aHour = u;
   return true;
 }
 bool nsMediaFragmentURIParser::ParseNPTMM(nsDependentSubstring& aString, uint32_t& aMinute)
 {
   return ParseNPTSS(aString, aMinute);
 }
 bool nsMediaFragmentURIParser::ParseNPTSS(nsDependentSubstring& aString, uint32_t& aSecond)
 {
   if (aString.Length() < 2) {
     return false;
   }
   if (IsDigit(aString[0]) && IsDigit(aString[1])) {
     nsDependentSubstring n(aString, 0, 2);
     nsresult ec;
     int32_t u = PromiseFlatString(n).ToInteger(&ec);
     if (NS_FAILED(ec)) {
       return false;
     }
     aString.Rebind(aString, 2);
     if (u >= 60)
       return false;
     aSecond = u;
     return true;
   }
   return false;
 }
 static bool ParseInteger(nsDependentSubstring& aString,
                          int32_t& aResult)
 {
   uint32_t index = FirstNonDigit(aString, 0);
   if (index == 0) {
     return false;
   }
   nsDependentSubstring n(aString, 0, index);
   nsresult ec;
   int32_t s = PromiseFlatString(n).ToInteger(&ec);
   if (NS_FAILED(ec)) {
     return false;
   }
   aString.Rebind(aString, index);
   aResult = s;
   return true;
 }
 static bool ParseCommaSeparator(nsDependentSubstring& aString)
 {
   if (aString.Length() > 1 && aString[0] == ',') {
     aString.Rebind(aString, 1);
     return true;
   }
   return false;
 }
 bool nsMediaFragmentURIParser::ParseXYWH(nsDependentSubstring aString)
 {
   int32_t x, y, w, h;
   ClipUnit clipUnit;
   // Determine units.
   if (StringBeginsWith(aString, NS_LITERAL_STRING("pixel:"))) {
     clipUnit = eClipUnit_Pixel;
     aString.Rebind(aString, 6);
   } else if (StringBeginsWith(aString, NS_LITERAL_STRING("percent:"))) {
     clipUnit = eClipUnit_Percent;
     aString.Rebind(aString, 8);
   } else {
     clipUnit = eClipUnit_Pixel;
   }
   // Read and validate coordinates.
   if (ParseInteger(aString, x) && x >= 0 &&
       ParseCommaSeparator(aString)       &&
       ParseInteger(aString, y) && y >= 0 &&
       ParseCommaSeparator(aString)       &&
       ParseInteger(aString, w) && w > 0  &&
       ParseCommaSeparator(aString)       &&
       ParseInteger(aString, h) && h > 0  &&
       aString.Length() == 0) {
     // Reject invalid percentage coordinates.
     if (clipUnit == eClipUnit_Percent &&
         (x + w > 100 || y + h > 100)) {
       return false;
     }
     mClip.construct(x, y, w, h);
     mClipUnit = clipUnit;
     return true;
   }
   return false;
 }
 bool nsMediaFragmentURIParser::ParseMozResolution(nsDependentSubstring aString)
 {
   int32_t w, h;
   // Read and validate coordinates.
   if (ParseInteger(aString, w) && w >= 0 &&
       ParseCommaSeparator(aString)       &&
       ParseInteger(aString, h) && h >= 0 &&
       aString.Length() == 0) {
     mResolution.construct(w,h);
     return true;
   }
   return false;
 }
 bool nsMediaFragmentURIParser::ParseMozSampleSize(nsDependentSubstring aString)
 {
   int32_t sampleSize;
   // Read and validate coordinates.
   if (ParseInteger(aString, sampleSize) && sampleSize > 0) {
     mSampleSize.construct(sampleSize);
     return true;
   }
   return false;
 }
 void nsMediaFragmentURIParser::Parse(nsACString& aRef)
 {
   // Create an array of possibly-invalid media fragments.
   nsTArray< std::pair<nsCString, nsCString> > fragments;
   nsCCharSeparatedTokenizer tokenizer(aRef, '&');
   while (tokenizer.hasMoreTokens()) {
     const nsCSubstring& nv = tokenizer.nextToken();
     int32_t index = nv.FindChar('=');
     if (index >= 0) {
       nsAutoCString name;
       nsAutoCString value;
       NS_UnescapeURL(StringHead(nv, index), esc_Ref | esc_AlwaysCopy, name);
       NS_UnescapeURL(Substring(nv, index + 1, nv.Length()),
                      esc_Ref | esc_AlwaysCopy, value);
       fragments.AppendElement(make_pair(name, value));
     }
   }
   // Parse the media fragment values.
   bool gotTemporal = false, gotSpatial = false,
       gotResolution = false, gotSampleSize = false;
   for (int i = fragments.Length() - 1 ; i >= 0 ; --i) {
     if (gotTemporal && gotSpatial && gotResolution && gotSampleSize) {
       // We've got one of each possible type. No need to look at the rest.
       break;
     } else if (!gotTemporal && fragments[i].first.EqualsLiteral("t")) {
       nsAutoString value = NS_ConvertUTF8toUTF16(fragments[i].second);
       gotTemporal = ParseNPT(nsDependentSubstring(value, 0));
     } else if (!gotSpatial && fragments[i].first.EqualsLiteral("xywh")) {
       nsAutoString value = NS_ConvertUTF8toUTF16(fragments[i].second);
       gotSpatial = ParseXYWH(nsDependentSubstring(value, 0));
     } else if (!gotResolution && fragments[i].first.EqualsLiteral("-moz-resolution")) {
       nsAutoString value = NS_ConvertUTF8toUTF16(fragments[i].second);
       gotResolution = ParseMozResolution(nsDependentSubstring(value, 0));
     } else if (!gotSampleSize && fragments[i].first.EqualsLiteral("-moz-samplesize")) {
       nsAutoString value = NS_ConvertUTF8toUTF16(fragments[i].second);
       gotSampleSize = ParseMozSampleSize(nsDependentSubstring(value, 0));
     }
   }
 }
 }} // namespace mozilla::net

The Tor Browser / annotate

netwerk/base/src/nsMediaFragmentURIParser.cpp@b8a032363ba2 (annotated)

netwerk/base/src/nsMediaFragmentURIParser.cpp