Add m-esr52 at 52.6.0

1 files changed, 1304 insertions, 0 deletions

diff --git a/xpcom/glue/nsStringAPI.cpp b/xpcom/glue/nsStringAPI.cpp
new file mode 100644
index 000000000..e5114a149
--- /dev/null
+++ b/xpcom/glue/nsStringAPI.cpp
@@ -0,0 +1,1304 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nscore.h"
+#include "nsCRTGlue.h"
+#include "prprf.h"
+#include "nsStringAPI.h"
+#include "nsXPCOMStrings.h"
+#include "nsDebug.h"
+
+#include "mozilla/Sprintf.h"
+
+#include <stdio.h>
+
+// nsAString
+
+uint32_t
+nsAString::BeginReading(const char_type** aBegin, const char_type** aEnd) const
+{
+  uint32_t len = NS_StringGetData(*this, aBegin);
+  if (aEnd) {
+    *aEnd = *aBegin + len;
+  }
+
+  return len;
+}
+
+const nsAString::char_type*
+nsAString::BeginReading() const
+{
+  const char_type* data;
+  NS_StringGetData(*this, &data);
+  return data;
+}
+
+const nsAString::char_type*
+nsAString::EndReading() const
+{
+  const char_type* data;
+  uint32_t len = NS_StringGetData(*this, &data);
+  return data + len;
+}
+
+uint32_t
+nsAString::BeginWriting(char_type** aBegin, char_type** aEnd, uint32_t aNewSize)
+{
+  uint32_t len = NS_StringGetMutableData(*this, aNewSize, aBegin);
+  if (aEnd) {
+    *aEnd = *aBegin + len;
+  }
+
+  return len;
+}
+
+nsAString::char_type*
+nsAString::BeginWriting(uint32_t aLen)
+{
+  char_type* data;
+  NS_StringGetMutableData(*this, aLen, &data);
+  return data;
+}
+
+nsAString::char_type*
+nsAString::EndWriting()
+{
+  char_type* data;
+  uint32_t len = NS_StringGetMutableData(*this, UINT32_MAX, &data);
+  return data + len;
+}
+
+bool
+nsAString::SetLength(uint32_t aLen)
+{
+  char_type* data;
+  NS_StringGetMutableData(*this, aLen, &data);
+  return data != nullptr;
+}
+
+void
+nsAString::AssignLiteral(const char* aStr)
+{
+  uint32_t len = strlen(aStr);
+  char16_t* buf = BeginWriting(len);
+  if (!buf) {
+    return;
+  }
+
+  for (; *aStr; ++aStr, ++buf) {
+    *buf = *aStr;
+  }
+}
+
+void
+nsAString::AppendLiteral(const char* aASCIIStr)
+{
+  uint32_t appendLen = strlen(aASCIIStr);
+
+  uint32_t thisLen = Length();
+  char16_t* begin;
+  char16_t* end;
+  BeginWriting(&begin, &end, appendLen + thisLen);
+  if (!begin) {
+    return;
+  }
+
+  for (begin += thisLen; begin < end; ++begin, ++aASCIIStr) {
+    *begin = *aASCIIStr;
+  }
+}
+
+void
+nsAString::StripChars(const char* aSet)
+{
+  nsString copy(*this);
+
+  const char_type* source;
+  const char_type* sourceEnd;
+  copy.BeginReading(&source, &sourceEnd);
+
+  char_type* dest;
+  BeginWriting(&dest);
+  if (!dest) {
+    return;
+  }
+
+  char_type* curDest = dest;
+
+  for (; source < sourceEnd; ++source) {
+    const char* test;
+    for (test = aSet; *test; ++test) {
+      if (*source == char_type(*test)) {
+        break;
+      }
+    }
+
+    if (!*test) {
+      // not stripped, copy this char
+      *curDest = *source;
+      ++curDest;
+    }
+  }
+
+  SetLength(curDest - dest);
+}
+
+void
+nsAString::Trim(const char* aSet, bool aLeading, bool aTrailing)
+{
+  NS_ASSERTION(aLeading || aTrailing, "Ineffective Trim");
+
+  const char16_t* start;
+  const char16_t* end;
+  uint32_t cutLen;
+
+  if (aLeading) {
+    BeginReading(&start, &end);
+    for (cutLen = 0; start < end; ++start, ++cutLen) {
+      const char* test;
+      for (test = aSet; *test; ++test) {
+        if (*test == *start) {
+          break;
+        }
+      }
+      if (!*test) {
+        break;
+      }
+    }
+    if (cutLen) {
+      NS_StringCutData(*this, 0, cutLen);
+    }
+  }
+  if (aTrailing) {
+    uint32_t len = BeginReading(&start, &end);
+    --end;
+    for (cutLen = 0; end >= start; --end, ++cutLen) {
+      const char* test;
+      for (test = aSet; *test; ++test) {
+        if (*test == *end) {
+          break;
+        }
+      }
+      if (!*test) {
+        break;
+      }
+    }
+    if (cutLen) {
+      NS_StringCutData(*this, len - cutLen, cutLen);
+    }
+  }
+}
+
+int32_t
+nsAString::DefaultComparator(const char_type* aStrA, const char_type* aStrB,
+                             uint32_t aLen)
+{
+  for (const char_type* end = aStrA + aLen; aStrA < end; ++aStrA, ++aStrB) {
+    if (*aStrA == *aStrB) {
+      continue;
+    }
+
+    return *aStrA < *aStrB ? -1 : 1;
+  }
+
+  return 0;
+}
+
+int32_t
+nsAString::Compare(const char_type* aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  uint32_t selflen = NS_StringGetData(*this, &cself);
+  uint32_t otherlen = NS_strlen(aOther);
+  uint32_t comparelen = selflen <= otherlen ? selflen : otherlen;
+
+  int32_t result = aComparator(cself, aOther, comparelen);
+  if (result == 0) {
+    if (selflen < otherlen) {
+      return -1;
+    } else if (selflen > otherlen) {
+      return 1;
+    }
+  }
+  return result;
+}
+
+int32_t
+nsAString::Compare(const self_type& aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  const char_type* cother;
+  uint32_t selflen = NS_StringGetData(*this, &cself);
+  uint32_t otherlen = NS_StringGetData(aOther, &cother);
+  uint32_t comparelen = selflen <= otherlen ? selflen : otherlen;
+
+  int32_t result = aComparator(cself, cother, comparelen);
+  if (result == 0) {
+    if (selflen < otherlen) {
+      return -1;
+    } else if (selflen > otherlen) {
+      return 1;
+    }
+  }
+  return result;
+}
+
+bool
+nsAString::Equals(const char_type* aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  uint32_t selflen = NS_StringGetData(*this, &cself);
+  uint32_t otherlen = NS_strlen(aOther);
+
+  if (selflen != otherlen) {
+    return false;
+  }
+
+  return aComparator(cself, aOther, selflen) == 0;
+}
+
+bool
+nsAString::Equals(const self_type& aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  const char_type* cother;
+  uint32_t selflen = NS_StringGetData(*this, &cself);
+  uint32_t otherlen = NS_StringGetData(aOther, &cother);
+
+  if (selflen != otherlen) {
+    return false;
+  }
+
+  return aComparator(cself, cother, selflen) == 0;
+}
+
+bool
+nsAString::EqualsLiteral(const char* aASCIIString) const
+{
+  const char16_t* begin;
+  const char16_t* end;
+  BeginReading(&begin, &end);
+
+  for (; begin < end; ++begin, ++aASCIIString) {
+    if (!*aASCIIString || !NS_IsAscii(*begin) ||
+        (char)*begin != *aASCIIString) {
+      return false;
+    }
+  }
+
+  return *aASCIIString == '\0';
+}
+
+bool
+nsAString::LowerCaseEqualsLiteral(const char* aASCIIString) const
+{
+  const char16_t* begin;
+  const char16_t* end;
+  BeginReading(&begin, &end);
+
+  for (; begin < end; ++begin, ++aASCIIString) {
+    if (!*aASCIIString || !NS_IsAscii(*begin) ||
+        NS_ToLower((char)*begin) != *aASCIIString) {
+      return false;
+    }
+  }
+
+  return *aASCIIString == '\0';
+}
+
+int32_t
+nsAString::Find(const self_type& aStr, uint32_t aOffset,
+                ComparatorFunc aComparator) const
+{
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  if (aOffset > selflen) {
+    return -1;
+  }
+
+  const char_type* other;
+  uint32_t otherlen = aStr.BeginReading(&other);
+
+  if (otherlen > selflen - aOffset) {
+    return -1;
+  }
+
+  // We want to stop searching otherlen characters before the end of the string
+  end -= otherlen;
+
+  for (const char_type* cur = begin + aOffset; cur <= end; ++cur) {
+    if (!aComparator(cur, other, otherlen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+static bool
+ns_strnmatch(const char16_t* aStr, const char* aSubstring, uint32_t aLen)
+{
+  for (; aLen; ++aStr, ++aSubstring, --aLen) {
+    if (!NS_IsAscii(*aStr)) {
+      return false;
+    }
+
+    if ((char)*aStr != *aSubstring) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+static bool
+ns_strnimatch(const char16_t* aStr, const char* aSubstring, uint32_t aLen)
+{
+  for (; aLen; ++aStr, ++aSubstring, --aLen) {
+    if (!NS_IsAscii(*aStr)) {
+      return false;
+    }
+
+    if (NS_ToLower((char)*aStr) != NS_ToLower(*aSubstring)) {
+      return false;
+    }
+  }
+
+  return true;
+}
+
+int32_t
+nsAString::Find(const char* aStr, uint32_t aOffset, bool aIgnoreCase) const
+{
+  bool (*match)(const char16_t*, const char*, uint32_t) =
+    aIgnoreCase ? ns_strnimatch : ns_strnmatch;
+
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  if (aOffset > selflen) {
+    return -1;
+  }
+
+  uint32_t otherlen = strlen(aStr);
+
+  if (otherlen > selflen - aOffset) {
+    return -1;
+  }
+
+  // We want to stop searching otherlen characters before the end of the string
+  end -= otherlen;
+
+  for (const char_type* cur = begin + aOffset; cur <= end; ++cur) {
+    if (match(cur, aStr, otherlen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsAString::RFind(const self_type& aStr, int32_t aOffset,
+                 ComparatorFunc aComparator) const
+{
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  const char_type* other;
+  uint32_t otherlen = aStr.BeginReading(&other);
+
+  if (selflen < otherlen) {
+    return -1;
+  }
+
+  if (aOffset < 0 || uint32_t(aOffset) > (selflen - otherlen)) {
+    end -= otherlen;
+  } else {
+    end = begin + aOffset;
+  }
+
+  for (const char_type* cur = end; cur >= begin; --cur) {
+    if (!aComparator(cur, other, otherlen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsAString::RFind(const char* aStr, int32_t aOffset, bool aIgnoreCase) const
+{
+  bool (*match)(const char16_t*, const char*, uint32_t) =
+    aIgnoreCase ? ns_strnimatch : ns_strnmatch;
+
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+  uint32_t otherlen = strlen(aStr);
+
+  if (selflen < otherlen) {
+    return -1;
+  }
+
+  if (aOffset < 0 || uint32_t(aOffset) > (selflen - otherlen)) {
+    end -= otherlen;
+  } else {
+    end = begin + aOffset;
+  }
+
+  for (const char_type* cur = end; cur >= begin; --cur) {
+    if (match(cur, aStr, otherlen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsAString::FindChar(char_type aChar, uint32_t aOffset) const
+{
+  const char_type* start;
+  const char_type* end;
+  uint32_t len = BeginReading(&start, &end);
+  if (aOffset > len) {
+    return -1;
+  }
+
+  const char_type* cur;
+
+  for (cur = start + aOffset; cur < end; ++cur) {
+    if (*cur == aChar) {
+      return cur - start;
+    }
+  }
+
+  return -1;
+}
+
+int32_t
+nsAString::RFindChar(char_type aChar) const
+{
+  const char16_t* start;
+  const char16_t* end;
+  BeginReading(&start, &end);
+
+  do {
+    --end;
+
+    if (*end == aChar) {
+      return end - start;
+    }
+
+  } while (end >= start);
+
+  return -1;
+}
+
+void
+nsAString::AppendInt(int aInt, int32_t aRadix)
+{
+  const char* fmt;
+  switch (aRadix) {
+    case 8:
+      fmt = "%o";
+      break;
+
+    case 10:
+      fmt = "%d";
+      break;
+
+    case 16:
+      fmt = "%x";
+      break;
+
+    default:
+      NS_ERROR("Unrecognized radix");
+      fmt = "";
+  }
+
+  char buf[20];
+  int len = SprintfLiteral(buf, fmt, aInt);
+  Append(NS_ConvertASCIItoUTF16(buf, len));
+}
+
+// Strings
+
+#ifndef XPCOM_GLUE_AVOID_NSPR
+int32_t
+nsAString::ToInteger(nsresult* aErrorCode, uint32_t aRadix) const
+{
+  NS_ConvertUTF16toUTF8 narrow(*this);
+
+  const char* fmt;
+  switch (aRadix) {
+    case 10:
+      fmt = "%i";
+      break;
+
+    case 16:
+      fmt = "%x";
+      break;
+
+    default:
+      NS_ERROR("Unrecognized radix!");
+      *aErrorCode = NS_ERROR_INVALID_ARG;
+      return 0;
+  }
+
+  int32_t result = 0;
+  if (PR_sscanf(narrow.get(), fmt, &result) == 1) {
+    *aErrorCode = NS_OK;
+  } else {
+    *aErrorCode = NS_ERROR_FAILURE;
+  }
+
+  return result;
+}
+
+int64_t
+nsAString::ToInteger64(nsresult* aErrorCode, uint32_t aRadix) const
+{
+  NS_ConvertUTF16toUTF8 narrow(*this);
+
+  const char* fmt;
+  switch (aRadix) {
+    case 10:
+      fmt = "%lli";
+      break;
+
+    case 16:
+      fmt = "%llx";
+      break;
+
+    default:
+      NS_ERROR("Unrecognized radix!");
+      *aErrorCode = NS_ERROR_INVALID_ARG;
+      return 0;
+  }
+
+  int64_t result = 0;
+  if (PR_sscanf(narrow.get(), fmt, &result) == 1) {
+    *aErrorCode = NS_OK;
+  } else {
+    *aErrorCode = NS_ERROR_FAILURE;
+  }
+
+  return result;
+}
+#endif // XPCOM_GLUE_AVOID_NSPR
+
+// nsACString
+
+uint32_t
+nsACString::BeginReading(const char_type** aBegin, const char_type** aEnd) const
+{
+  uint32_t len = NS_CStringGetData(*this, aBegin);
+  if (aEnd) {
+    *aEnd = *aBegin + len;
+  }
+
+  return len;
+}
+
+const nsACString::char_type*
+nsACString::BeginReading() const
+{
+  const char_type* data;
+  NS_CStringGetData(*this, &data);
+  return data;
+}
+
+const nsACString::char_type*
+nsACString::EndReading() const
+{
+  const char_type* data;
+  uint32_t len = NS_CStringGetData(*this, &data);
+  return data + len;
+}
+
+uint32_t
+nsACString::BeginWriting(char_type** aBegin, char_type** aEnd,
+                         uint32_t aNewSize)
+{
+  uint32_t len = NS_CStringGetMutableData(*this, aNewSize, aBegin);
+  if (aEnd) {
+    *aEnd = *aBegin + len;
+  }
+
+  return len;
+}
+
+nsACString::char_type*
+nsACString::BeginWriting(uint32_t aLen)
+{
+  char_type* data;
+  NS_CStringGetMutableData(*this, aLen, &data);
+  return data;
+}
+
+nsACString::char_type*
+nsACString::EndWriting()
+{
+  char_type* data;
+  uint32_t len = NS_CStringGetMutableData(*this, UINT32_MAX, &data);
+  return data + len;
+}
+
+bool
+nsACString::SetLength(uint32_t aLen)
+{
+  char_type* data;
+  NS_CStringGetMutableData(*this, aLen, &data);
+  return data != nullptr;
+}
+
+void
+nsACString::StripChars(const char* aSet)
+{
+  nsCString copy(*this);
+
+  const char_type* source;
+  const char_type* sourceEnd;
+  copy.BeginReading(&source, &sourceEnd);
+
+  char_type* dest;
+  BeginWriting(&dest);
+  if (!dest) {
+    return;
+  }
+
+  char_type* curDest = dest;
+
+  for (; source < sourceEnd; ++source) {
+    const char* test;
+    for (test = aSet; *test; ++test) {
+      if (*source == char_type(*test)) {
+        break;
+      }
+    }
+
+    if (!*test) {
+      // not stripped, copy this char
+      *curDest = *source;
+      ++curDest;
+    }
+  }
+
+  SetLength(curDest - dest);
+}
+
+void
+nsACString::Trim(const char* aSet, bool aLeading, bool aTrailing)
+{
+  NS_ASSERTION(aLeading || aTrailing, "Ineffective Trim");
+
+  const char* start;
+  const char* end;
+  uint32_t cutLen;
+
+  if (aLeading) {
+    BeginReading(&start, &end);
+    for (cutLen = 0; start < end; ++start, ++cutLen) {
+      const char* test;
+      for (test = aSet; *test; ++test) {
+        if (*test == *start) {
+          break;
+        }
+      }
+      if (!*test) {
+        break;
+      }
+    }
+    if (cutLen) {
+      NS_CStringCutData(*this, 0, cutLen);
+    }
+  }
+  if (aTrailing) {
+    uint32_t len = BeginReading(&start, &end);
+    --end;
+    for (cutLen = 0; end >= start; --end, ++cutLen) {
+      const char* test;
+      for (test = aSet; *test; ++test) {
+        if (*test == *end) {
+          break;
+        }
+      }
+      if (!*test) {
+        break;
+      }
+    }
+    if (cutLen) {
+      NS_CStringCutData(*this, len - cutLen, cutLen);
+    }
+  }
+}
+
+int32_t
+nsACString::DefaultComparator(const char_type* aStrA, const char_type* aStrB,
+                              uint32_t aLen)
+{
+  return memcmp(aStrA, aStrB, aLen);
+}
+
+int32_t
+nsACString::Compare(const char_type* aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  uint32_t selflen = NS_CStringGetData(*this, &cself);
+  uint32_t otherlen = strlen(aOther);
+  uint32_t comparelen = selflen <= otherlen ? selflen : otherlen;
+
+  int32_t result = aComparator(cself, aOther, comparelen);
+  if (result == 0) {
+    if (selflen < otherlen) {
+      return -1;
+    } else if (selflen > otherlen) {
+      return 1;
+    }
+  }
+  return result;
+}
+
+int32_t
+nsACString::Compare(const self_type& aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  const char_type* cother;
+  uint32_t selflen = NS_CStringGetData(*this, &cself);
+  uint32_t otherlen = NS_CStringGetData(aOther, &cother);
+  uint32_t comparelen = selflen <= otherlen ? selflen : otherlen;
+
+  int32_t result = aComparator(cself, cother, comparelen);
+  if (result == 0) {
+    if (selflen < otherlen) {
+      return -1;
+    } else if (selflen > otherlen) {
+      return 1;
+    }
+  }
+  return result;
+}
+
+bool
+nsACString::Equals(const char_type* aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  uint32_t selflen = NS_CStringGetData(*this, &cself);
+  uint32_t otherlen = strlen(aOther);
+
+  if (selflen != otherlen) {
+    return false;
+  }
+
+  return aComparator(cself, aOther, selflen) == 0;
+}
+
+bool
+nsACString::Equals(const self_type& aOther, ComparatorFunc aComparator) const
+{
+  const char_type* cself;
+  const char_type* cother;
+  uint32_t selflen = NS_CStringGetData(*this, &cself);
+  uint32_t otherlen = NS_CStringGetData(aOther, &cother);
+
+  if (selflen != otherlen) {
+    return false;
+  }
+
+  return aComparator(cself, cother, selflen) == 0;
+}
+
+int32_t
+nsACString::Find(const self_type& aStr, uint32_t aOffset,
+                 ComparatorFunc aComparator) const
+{
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  if (aOffset > selflen) {
+    return -1;
+  }
+
+  const char_type* other;
+  uint32_t otherlen = aStr.BeginReading(&other);
+
+  if (otherlen > selflen - aOffset) {
+    return -1;
+  }
+
+  // We want to stop searching otherlen characters before the end of the string
+  end -= otherlen;
+
+  for (const char_type* cur = begin + aOffset; cur <= end; ++cur) {
+    if (!aComparator(cur, other, otherlen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsACString::Find(const char_type* aStr, ComparatorFunc aComparator) const
+{
+  return Find(aStr, strlen(aStr), aComparator);
+}
+
+int32_t
+nsACString::Find(const char_type* aStr, uint32_t aLen,
+                 ComparatorFunc aComparator) const
+{
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  if (aLen == 0) {
+    NS_WARNING("Searching for zero-length string.");
+    return -1;
+  }
+
+  if (aLen > selflen) {
+    return -1;
+  }
+
+  // We want to stop searching otherlen characters before the end of the string
+  end -= aLen;
+
+  for (const char_type* cur = begin; cur <= end; ++cur) {
+    if (!aComparator(cur, aStr, aLen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsACString::RFind(const self_type& aStr, int32_t aOffset,
+                  ComparatorFunc aComparator) const
+{
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  const char_type* other;
+  uint32_t otherlen = aStr.BeginReading(&other);
+
+  if (selflen < otherlen) {
+    return -1;
+  }
+
+  if (aOffset < 0 || uint32_t(aOffset) > (selflen - otherlen)) {
+    end -= otherlen;
+  } else {
+    end = begin + aOffset;
+  }
+
+  for (const char_type* cur = end; cur >= begin; --cur) {
+    if (!aComparator(cur, other, otherlen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsACString::RFind(const char_type* aStr, ComparatorFunc aComparator) const
+{
+  return RFind(aStr, strlen(aStr), aComparator);
+}
+
+int32_t
+nsACString::RFind(const char_type* aStr, int32_t aLen,
+                  ComparatorFunc aComparator) const
+{
+  const char_type* begin;
+  const char_type* end;
+  uint32_t selflen = BeginReading(&begin, &end);
+
+  if (aLen <= 0) {
+    NS_WARNING("Searching for zero-length string.");
+    return -1;
+  }
+
+  if (uint32_t(aLen) > selflen) {
+    return -1;
+  }
+
+  // We want to start searching otherlen characters before the end of the string
+  end -= aLen;
+
+  for (const char_type* cur = end; cur >= begin; --cur) {
+    if (!aComparator(cur, aStr, aLen)) {
+      return cur - begin;
+    }
+  }
+  return -1;
+}
+
+int32_t
+nsACString::FindChar(char_type aChar, uint32_t aOffset) const
+{
+  const char_type* start;
+  const char_type* end;
+  uint32_t len = BeginReading(&start, &end);
+  if (aOffset > len) {
+    return -1;
+  }
+
+  const char_type* cur;
+
+  for (cur = start + aOffset; cur < end; ++cur) {
+    if (*cur == aChar) {
+      return cur - start;
+    }
+  }
+
+  return -1;
+}
+
+int32_t
+nsACString::RFindChar(char_type aChar) const
+{
+  const char* start;
+  const char* end;
+  BeginReading(&start, &end);
+
+  for (; end >= start; --end) {
+    if (*end == aChar) {
+      return end - start;
+    }
+  }
+
+  return -1;
+}
+
+void
+nsACString::AppendInt(int aInt, int32_t aRadix)
+{
+  const char* fmt;
+  switch (aRadix) {
+    case 8:
+      fmt = "%o";
+      break;
+
+    case 10:
+      fmt = "%d";
+      break;
+
+    case 16:
+      fmt = "%x";
+      break;
+
+    default:
+      NS_ERROR("Unrecognized radix");
+      fmt = "";
+  }
+
+  char buf[20];
+  int len = SprintfLiteral(buf, fmt, aInt);
+  Append(buf, len);
+}
+
+#ifndef XPCOM_GLUE_AVOID_NSPR
+int32_t
+nsACString::ToInteger(nsresult* aErrorCode, uint32_t aRadix) const
+{
+  const char* fmt;
+  switch (aRadix) {
+    case 10:
+      fmt = "%i";
+      break;
+
+    case 16:
+      fmt = "%x";
+      break;
+
+    default:
+      NS_ERROR("Unrecognized radix!");
+      *aErrorCode = NS_ERROR_INVALID_ARG;
+      return 0;
+  }
+
+  int32_t result = 0;
+  if (PR_sscanf(nsCString(*this).get(), fmt, &result) == 1) {
+    *aErrorCode = NS_OK;
+  } else {
+    *aErrorCode = NS_ERROR_FAILURE;
+  }
+
+  return result;
+}
+
+int64_t
+nsACString::ToInteger64(nsresult* aErrorCode, uint32_t aRadix) const
+{
+  const char* fmt;
+  switch (aRadix) {
+    case 10:
+      fmt = "%lli";
+      break;
+
+    case 16:
+      fmt = "%llx";
+      break;
+
+    default:
+      NS_ERROR("Unrecognized radix!");
+      *aErrorCode = NS_ERROR_INVALID_ARG;
+      return 0;
+  }
+
+  int64_t result = 0;
+  if (PR_sscanf(nsCString(*this).get(), fmt, &result) == 1) {
+    *aErrorCode = NS_OK;
+  } else {
+    *aErrorCode = NS_ERROR_FAILURE;
+  }
+
+  return result;
+}
+#endif // XPCOM_GLUE_AVOID_NSPR
+
+// Substrings
+
+nsDependentSubstring::nsDependentSubstring(const abstract_string_type& aStr,
+                                           uint32_t aStartPos)
+{
+  const char16_t* data;
+  uint32_t len = NS_StringGetData(aStr, &data);
+
+  if (aStartPos > len) {
+    aStartPos = len;
+  }
+
+  NS_StringContainerInit2(*this, data + aStartPos, len - aStartPos,
+                          NS_STRING_CONTAINER_INIT_DEPEND |
+                          NS_STRING_CONTAINER_INIT_SUBSTRING);
+}
+
+nsDependentSubstring::nsDependentSubstring(const abstract_string_type& aStr,
+                                           uint32_t aStartPos,
+                                           uint32_t aLength)
+{
+  const char16_t* data;
+  uint32_t len = NS_StringGetData(aStr, &data);
+
+  if (aStartPos > len) {
+    aStartPos = len;
+  }
+
+  if (aStartPos + aLength > len) {
+    aLength = len - aStartPos;
+  }
+
+  NS_StringContainerInit2(*this, data + aStartPos, aLength,
+                          NS_STRING_CONTAINER_INIT_DEPEND |
+                            NS_STRING_CONTAINER_INIT_SUBSTRING);
+}
+
+nsDependentCSubstring::nsDependentCSubstring(const abstract_string_type& aStr,
+                                             uint32_t aStartPos)
+{
+  const char* data;
+  uint32_t len = NS_CStringGetData(aStr, &data);
+
+  if (aStartPos > len) {
+    aStartPos = len;
+  }
+
+  NS_CStringContainerInit2(*this, data + aStartPos, len - aStartPos,
+                           NS_CSTRING_CONTAINER_INIT_DEPEND |
+                           NS_CSTRING_CONTAINER_INIT_SUBSTRING);
+}
+
+nsDependentCSubstring::nsDependentCSubstring(const abstract_string_type& aStr,
+                                             uint32_t aStartPos,
+                                             uint32_t aLength)
+{
+  const char* data;
+  uint32_t len = NS_CStringGetData(aStr, &data);
+
+  if (aStartPos > len) {
+    aStartPos = len;
+  }
+
+  if (aStartPos + aLength > len) {
+    aLength = len - aStartPos;
+  }
+
+  NS_CStringContainerInit2(*this, data + aStartPos, aLength,
+                           NS_CSTRING_CONTAINER_INIT_DEPEND |
+                           NS_CSTRING_CONTAINER_INIT_SUBSTRING);
+}
+
+// Utils
+
+char*
+ToNewUTF8String(const nsAString& aSource)
+{
+  nsCString temp;
+  CopyUTF16toUTF8(aSource, temp);
+  return NS_CStringCloneData(temp);
+}
+
+void
+CompressWhitespace(nsAString& aString)
+{
+  char16_t* start;
+  uint32_t len = NS_StringGetMutableData(aString, UINT32_MAX, &start);
+  char16_t* end = start + len;
+  char16_t* from = start;
+  char16_t* to = start;
+
+  // Skip any leading whitespace
+  while (from < end && NS_IsAsciiWhitespace(*from)) {
+    from++;
+  }
+
+  while (from < end) {
+    char16_t theChar = *from++;
+
+    if (NS_IsAsciiWhitespace(theChar)) {
+      // We found a whitespace char, so skip over any more
+      while (from < end && NS_IsAsciiWhitespace(*from)) {
+        from++;
+      }
+
+      // Turn all whitespace into spaces
+      theChar = ' ';
+    }
+
+    *to++ = theChar;
+  }
+
+  // Drop any trailing space
+  if (to > start && to[-1] == ' ') {
+    to--;
+  }
+
+  // Re-terminate the string
+  *to = '\0';
+
+  // Set the new length
+  aString.SetLength(to - start);
+}
+
+uint32_t
+ToLowerCase(nsACString& aStr)
+{
+  char* begin;
+  char* end;
+  uint32_t len = aStr.BeginWriting(&begin, &end);
+
+  for (; begin < end; ++begin) {
+    *begin = NS_ToLower(*begin);
+  }
+
+  return len;
+}
+
+uint32_t
+ToUpperCase(nsACString& aStr)
+{
+  char* begin;
+  char* end;
+  uint32_t len = aStr.BeginWriting(&begin, &end);
+
+  for (; begin < end; ++begin) {
+    *begin = NS_ToUpper(*begin);
+  }
+
+  return len;
+}
+
+uint32_t
+ToLowerCase(const nsACString& aSrc, nsACString& aDest)
+{
+  const char* begin;
+  const char* end;
+  uint32_t len = aSrc.BeginReading(&begin, &end);
+
+  char* dest;
+  NS_CStringGetMutableData(aDest, len, &dest);
+
+  for (; begin < end; ++begin, ++dest) {
+    *dest = NS_ToLower(*begin);
+  }
+
+  return len;
+}
+
+uint32_t
+ToUpperCase(const nsACString& aSrc, nsACString& aDest)
+{
+  const char* begin;
+  const char* end;
+  uint32_t len = aSrc.BeginReading(&begin, &end);
+
+  char* dest;
+  NS_CStringGetMutableData(aDest, len, &dest);
+
+  for (; begin < end; ++begin, ++dest) {
+    *dest = NS_ToUpper(*begin);
+  }
+
+  return len;
+}
+
+int32_t
+CaseInsensitiveCompare(const char* aStrA, const char* aStrB,
+                       uint32_t aLen)
+{
+  for (const char* aend = aStrA + aLen; aStrA < aend; ++aStrA, ++aStrB) {
+    char la = NS_ToLower(*aStrA);
+    char lb = NS_ToLower(*aStrB);
+
+    if (la == lb) {
+      continue;
+    }
+
+    return la < lb ? -1 : 1;
+  }
+
+  return 0;
+}
+
+bool
+ParseString(const nsACString& aSource, char aDelimiter,
+            nsTArray<nsCString>& aArray)
+{
+  int32_t start = 0;
+  int32_t end = aSource.Length();
+
+  uint32_t oldLength = aArray.Length();
+
+  for (;;) {
+    int32_t delimiter = aSource.FindChar(aDelimiter, start);
+    if (delimiter < 0) {
+      delimiter = end;
+    }
+
+    if (delimiter != start) {
+      if (!aArray.AppendElement(Substring(aSource, start, delimiter - start))) {
+        aArray.RemoveElementsAt(oldLength, aArray.Length() - oldLength);
+        return false;
+      }
+    }
+
+    if (delimiter == end) {
+      break;
+    }
+    start = ++delimiter;
+    if (start == end) {
+      break;
+    }
+  }
+
+  return true;
+}