void
nsTSubstring_CharT::Replace( index_type cutStart, size_type cutLength, const char_type* data, size_type length )
{
// unfortunately, some callers pass null :-(
if (!data)
{
length = 0;
}
else
{
if (length == size_type(-1))
length = char_traits::length(data);
if (IsDependentOn(data, data + length))
{
nsTAutoString_CharT temp(data, length);
Replace(cutStart, cutLength, temp);
return;
}
}
cutStart = XPCOM_MIN(cutStart, Length());
if (ReplacePrep(cutStart, cutLength, length) && length > 0)
char_traits::copy(mData + cutStart, data, length);
}
NS_IMETHODIMP
nsScriptableInputStream::Read(uint32_t aCount, char** aResult)
{
nsresult rv = NS_OK;
uint64_t count64 = 0;
char* buffer = nullptr;
if (!mInputStream) {
return NS_ERROR_NOT_INITIALIZED;
}
rv = mInputStream->Available(&count64);
if (NS_FAILED(rv)) {
return rv;
}
// bug716556 - Ensure count+1 doesn't overflow
uint32_t count =
XPCOM_MIN((uint32_t)XPCOM_MIN<uint64_t>(count64, aCount), UINT32_MAX - 1);
buffer = (char*)malloc(count + 1); // make room for '\0'
if (!buffer) {
return NS_ERROR_OUT_OF_MEMORY;
}
rv = ReadHelper(buffer, count);
if (NS_FAILED(rv)) {
free(buffer);
return rv;
}
buffer[count] = '\0';
*aResult = buffer;
return NS_OK;
}
static int32_t
CompareVP(VersionPartW& aVer1, VersionPartW& aVer2)
{
int32_t r = ns_cmp(aVer1.numA, aVer2.numA);
if (r) {
return r;
}
r = wcsncmp(aVer1.strB, aVer2.strB, XPCOM_MIN(aVer1.strBlen, aVer2.strBlen));
if (r) {
return r;
}
r = ns_cmp(aVer1.numC, aVer2.numC);
if (r) {
return r;
}
if (!aVer1.extraD) {
return aVer2.extraD != 0;
}
if (!aVer2.extraD) {
return -1;
}
return wcscmp(aVer1.extraD, aVer2.extraD);
}
bool
nsString::EqualsIgnoreCase( const char* aString, int32_t aCount ) const
{
uint32_t strLen = nsCharTraits<char>::length(aString);
int32_t maxCount = int32_t(XPCOM_MIN(mLength, strLen));
int32_t compareCount;
if (aCount < 0 || aCount > maxCount)
compareCount = maxCount;
else
compareCount = aCount;
int32_t result =
nsBufferRoutines<char16_t>::compare(mData, aString, compareCount, true);
if (result == 0 &&
(aCount < 0 || strLen < uint32_t(aCount) || mLength < uint32_t(aCount)))
{
// Since the caller didn't give us a length to test, or strings shorter
// than aCount, and compareCount characters matched, we have to assume
// that the longer string is greater.
if (mLength != strLen)
result = 1; // Arbitrarily using any number != 0
}
return result == 0;
}
int NS_FASTCALL
Compare(const nsTSubstring_CharT::base_string_type& aLhs,
const nsTSubstring_CharT::base_string_type& aRhs,
const nsTStringComparator_CharT& comp)
{
typedef nsTSubstring_CharT::size_type size_type;
if (&aLhs == &aRhs) {
return 0;
}
nsTSubstring_CharT::const_iterator leftIter, rightIter;
aLhs.BeginReading(leftIter);
aRhs.BeginReading(rightIter);
size_type lLength = leftIter.size_forward();
size_type rLength = rightIter.size_forward();
size_type lengthToCompare = XPCOM_MIN(lLength, rLength);
int result;
if ((result = comp(leftIter.get(), rightIter.get(),
lengthToCompare, lengthToCompare)) == 0) {
if (lLength < rLength) {
result = -1;
} else if (rLength < lLength) {
result = 1;
} else {
result = 0;
}
}
return result;
}
int32_t
nsCString::Compare( const char* aString, bool aIgnoreCase, int32_t aCount ) const
{
uint32_t strLen = char_traits::length(aString);
int32_t maxCount = int32_t(XPCOM_MIN(mLength, strLen));
int32_t compareCount;
if (aCount < 0 || aCount > maxCount)
compareCount = maxCount;
else
compareCount = aCount;
int32_t result =
nsBufferRoutines<char>::compare(mData, aString, compareCount, aIgnoreCase);
if (result == 0 &&
(aCount < 0 || strLen < uint32_t(aCount) || mLength < uint32_t(aCount)))
{
// Since the caller didn't give us a length to test, or strings shorter
// than aCount, and compareCount characters matched, we have to assume
// that the longer string is greater.
if (mLength != strLen)
result = (mLength < strLen) ? -1 : 1;
}
return result;
}
NS_IMETHODIMP
StringUnicharInputStream::ReadSegments(nsWriteUnicharSegmentFun aWriter,
void* aClosure,
uint32_t aCount, uint32_t* aReadCount)
{
uint32_t bytesWritten;
uint32_t totalBytesWritten = 0;
nsresult rv;
aCount = XPCOM_MIN(mString.Length() - mPos, aCount);
nsAString::const_iterator iter;
mString.BeginReading(iter);
while (aCount) {
rv = aWriter(this, aClosure, iter.get() + mPos,
totalBytesWritten, aCount, &bytesWritten);
if (NS_FAILED(rv)) {
// don't propagate errors to the caller
break;
}
aCount -= bytesWritten;
totalBytesWritten += bytesWritten;
mPos += bytesWritten;
}
*aReadCount = totalBytesWritten;
return NS_OK;
}
// This version of Replace is optimized for single-character replacement.
void
nsTSubstring_CharT::Replace( index_type cutStart, size_type cutLength, char_type c )
{
cutStart = XPCOM_MIN(cutStart, Length());
if (ReplacePrep(cutStart, cutLength, 1))
mData[cutStart] = c;
}
NS_IMETHODIMP
nsStorageStream::Write(const char *aBuffer, uint32_t aCount, uint32_t *aNumWritten)
{
if (NS_WARN_IF(!aNumWritten) || NS_WARN_IF(!aBuffer))
return NS_ERROR_INVALID_ARG;
if (NS_WARN_IF(!mSegmentedBuffer))
return NS_ERROR_NOT_INITIALIZED;
const char* readCursor;
uint32_t count, availableInSegment, remaining;
nsresult rv = NS_OK;
LOG(("nsStorageStream [%p] Write mWriteCursor=%x mSegmentEnd=%x aCount=%d\n",
this, mWriteCursor, mSegmentEnd, aCount));
remaining = aCount;
readCursor = aBuffer;
// If no segments have been created yet, create one even if we don't have
// to write any data; this enables creating an input stream which reads from
// the very end of the data for any amount of data in the stream (i.e.
// this stream contains N bytes of data and newInputStream(N) is called),
// even for N=0 (with the caveat that we require .write("", 0) be called to
// initialize internal buffers).
bool firstTime = mSegmentedBuffer->GetSegmentCount() == 0;
while (remaining || MOZ_UNLIKELY(firstTime)) {
firstTime = false;
availableInSegment = mSegmentEnd - mWriteCursor;
if (!availableInSegment) {
mWriteCursor = mSegmentedBuffer->AppendNewSegment();
if (!mWriteCursor) {
mSegmentEnd = 0;
rv = NS_ERROR_OUT_OF_MEMORY;
goto out;
}
mLastSegmentNum++;
mSegmentEnd = mWriteCursor + mSegmentSize;
availableInSegment = mSegmentEnd - mWriteCursor;
LOG(("nsStorageStream [%p] Write (new seg) mWriteCursor=%x mSegmentEnd=%x\n",
this, mWriteCursor, mSegmentEnd));
}
count = XPCOM_MIN(availableInSegment, remaining);
memcpy(mWriteCursor, readCursor, count);
remaining -= count;
readCursor += count;
mWriteCursor += count;
LOG(("nsStorageStream [%p] Writing mWriteCursor=%x mSegmentEnd=%x count=%d\n",
this, mWriteCursor, mSegmentEnd, count));
};
out:
*aNumWritten = aCount - remaining;
mLogicalLength += *aNumWritten;
LOG(("nsStorageStream [%p] Wrote mWriteCursor=%x mSegmentEnd=%x numWritten=%d\n",
this, mWriteCursor, mSegmentEnd, *aNumWritten));
return rv;
}
void
nsTDependentSubstring_CharT::Rebind( const substring_type& str, uint32_t startPos, uint32_t length )
{
// If we currently own a buffer, release it.
Finalize();
size_type strLength = str.Length();
if (startPos > strLength)
startPos = strLength;
mData = const_cast<char_type*>(static_cast<const char_type*>(str.Data())) + startPos;
mLength = XPCOM_MIN(length, strLength - startPos);
SetDataFlags(F_NONE);
}
void
nsTSubstring_CharT::Replace( index_type cutStart, size_type cutLength, const substring_tuple_type& tuple )
{
if (tuple.IsDependentOn(mData, mData + mLength))
{
nsTAutoString_CharT temp(tuple);
Replace(cutStart, cutLength, temp);
return;
}
size_type length = tuple.Length();
cutStart = XPCOM_MIN(cutStart, Length());
if (ReplacePrep(cutStart, cutLength, length) && length > 0)
tuple.WriteTo(mData + cutStart, length);
}
uint32_t
write( const char* aSource, uint32_t aSourceLength )
{
uint32_t len = XPCOM_MIN(uint32_t(mIter.size_forward()), aSourceLength);
char* cp = mIter.get();
const char* end = aSource + len;
while (aSource != end) {
char ch = *aSource;
if ((ch >= 'A') && (ch <= 'Z'))
*cp = ch + ('a' - 'A');
else
*cp = ch;
++aSource;
++cp;
}
mIter.advance(len);
return len;
}
nsresult
FileLocation::Data::Copy(char *buf, uint32_t len)
{
if (mFd) {
for (uint32_t totalRead = 0; totalRead < len; ) {
int32_t read = PR_Read(mFd, buf + totalRead, XPCOM_MIN(len - totalRead, uint32_t(INT32_MAX)));
if (read < 0)
return NS_ErrorAccordingToNSPR();
totalRead += read;
}
return NS_OK;
} else if (mItem) {
nsZipCursor cursor(mItem, mZip, reinterpret_cast<uint8_t *>(buf), len, true);
uint32_t readLen;
cursor.Copy(&readLen);
return (readLen == len) ? NS_OK : NS_ERROR_FILE_CORRUPTED;
}
return NS_ERROR_NOT_INITIALIZED;
}
bool
nsTSubstring_CharT::SetCapacity( size_type capacity, const fallible_t& )
{
// capacity does not include room for the terminating null char
// if our capacity is reduced to zero, then free our buffer.
if (capacity == 0)
{
::ReleaseData(mData, mFlags);
mData = char_traits::sEmptyBuffer;
mLength = 0;
SetDataFlags(F_TERMINATED);
return true;
}
char_type* oldData;
uint32_t oldFlags;
if (!MutatePrep(capacity, &oldData, &oldFlags))
return false; // out-of-memory
// compute new string length
size_type newLen = XPCOM_MIN(mLength, capacity);
if (oldData)
{
// preserve old data
if (mLength > 0)
char_traits::copy(mData, oldData, newLen);
::ReleaseData(oldData, oldFlags);
}
// adjust mLength if our buffer shrunk down in size
if (newLen < mLength)
mLength = newLen;
// always null-terminate here, even if the buffer got longer. this is
// for backwards compat with the old string implementation.
mData[capacity] = char_type(0);
return true;
}
void
LossyConvertEncoding8to16::write_sse2(const char* aSource,
uint32_t aSourceLength)
{
char16_t* dest = mDestination;
// Align source to a 16-byte boundary. We choose to align source rather than
// dest because we'd rather have our loads than our stores be fast. You have
// to wait for a load to complete, but you can keep on moving after issuing a
// store.
uint32_t i = 0;
uint32_t alignLen = XPCOM_MIN(aSourceLength, uint32_t(-NS_PTR_TO_INT32(aSource) & 0xf));
for (; i < alignLen; ++i) {
dest[i] = static_cast<unsigned char>(aSource[i]);
}
// Walk 32 bytes (two XMM registers) at a time.
for (; aSourceLength - i > 31; i += 32) {
__m128i source1 = _mm_load_si128(reinterpret_cast<const __m128i*>(aSource + i));
__m128i source2 = _mm_load_si128(reinterpret_cast<const __m128i*>(aSource + i + 16));
// Interleave 0s in with the bytes of source to create lo and hi.
__m128i lo1 = _mm_unpacklo_epi8(source1, _mm_setzero_si128());
__m128i hi1 = _mm_unpackhi_epi8(source1, _mm_setzero_si128());
__m128i lo2 = _mm_unpacklo_epi8(source2, _mm_setzero_si128());
__m128i hi2 = _mm_unpackhi_epi8(source2, _mm_setzero_si128());
// store lo and hi into dest.
_mm_storeu_si128(reinterpret_cast<__m128i*>(dest + i), lo1);
_mm_storeu_si128(reinterpret_cast<__m128i*>(dest + i + 8), hi1);
_mm_storeu_si128(reinterpret_cast<__m128i*>(dest + i + 16), lo2);
_mm_storeu_si128(reinterpret_cast<__m128i*>(dest + i + 24), hi2);
}
// Finish up whatever's left.
for (; i < aSourceLength; ++i) {
dest[i] = static_cast<unsigned char>(aSource[i]);
}
mDestination += i;
}
void
nsTSubstring_CharT::ReplaceASCII( index_type cutStart, size_type cutLength, const char* data, size_type length )
{
if (length == size_type(-1))
length = strlen(data);
// A Unicode string can't depend on an ASCII string buffer,
// so this dependence check only applies to CStrings.
#ifdef CharT_is_char
if (IsDependentOn(data, data + length))
{
nsTAutoString_CharT temp(data, length);
Replace(cutStart, cutLength, temp);
return;
}
#endif
cutStart = XPCOM_MIN(cutStart, Length());
if (ReplacePrep(cutStart, cutLength, length) && length > 0)
char_traits::copyASCII(mData + cutStart, data, length);
}
void NS_QuickSort (
void *a,
unsigned int n,
unsigned int es,
cmp_t *cmp,
void *data
)
{
char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
int d, r, swaptype;
loop: SWAPINIT(a, es);
/* Use insertion sort when input is small */
if (n < 7) {
for (pm = (char *)a + es; pm < (char *)a + n * es; pm += es)
for (pl = pm; pl > (char *)a && cmp(pl - es, pl, data) > 0;
pl -= es)
swap(pl, pl - es);
return;
}
/* Choose pivot */
pm = (char *)a + (n / 2) * es;
if (n > 7) {
pl = (char *)a;
pn = (char *)a + (n - 1) * es;
if (n > 40) {
d = (n / 8) * es;
pl = med3(pl, pl + d, pl + 2 * d, cmp, data);
pm = med3(pm - d, pm, pm + d, cmp, data);
pn = med3(pn - 2 * d, pn - d, pn, cmp, data);
}
pm = med3(pl, pm, pn, cmp, data);
}
swap(a, pm);
pa = pb = (char *)a + es;
pc = pd = (char *)a + (n - 1) * es;
/* loop invariants:
* [a, pa) = pivot
* [pa, pb) < pivot
* [pb, pc + es) unprocessed
* [pc + es, pd + es) > pivot
* [pd + es, pn) = pivot
*/
for (;;) {
while (pb <= pc && (r = cmp(pb, a, data)) <= 0) {
if (r == 0) {
swap(pa, pb);
pa += es;
}
pb += es;
}
while (pb <= pc && (r = cmp(pc, a, data)) >= 0) {
if (r == 0) {
swap(pc, pd);
pd -= es;
}
pc -= es;
}
if (pb > pc)
break;
swap(pb, pc);
pb += es;
pc -= es;
}
/* Move pivot values */
pn = (char *)a + n * es;
r = XPCOM_MIN(pa - (char *)a, pb - pa);
vecswap(a, pb - r, r);
r = XPCOM_MIN<size_t>(pd - pc, pn - pd - es);
vecswap(pb, pn - r, r);
/* Recursively process partitioned items */
if ((r = pb - pa) > (int)es)
NS_QuickSort(a, r / es, es, cmp, data);
if ((r = pd - pc) > (int)es) {
/* Iterate rather than recurse to save stack space */
a = pn - r;
n = r / es;
goto loop;
}
/* NS_QuickSort(pn - r, r / es, es, cmp, data);*/
}
nsresult
FileReader::DoReadData(uint64_t aCount)
{
MOZ_ASSERT(mAsyncStream);
uint32_t bytesRead = 0;
if (mDataFormat == FILE_AS_BINARY) {
//Continuously update our binary string as data comes in
CheckedInt<uint64_t> size = mResult.Length();
size += aCount;
if (!size.isValid() ||
size.value() > UINT32_MAX ||
size.value() > mTotal) {
return NS_ERROR_OUT_OF_MEMORY;
}
uint32_t oldLen = mResult.Length();
MOZ_ASSERT(oldLen == mDataLen, "unexpected mResult length");
char16_t* dest = nullptr;
mResult.GetMutableData(&dest, size.value(), fallible);
NS_ENSURE_TRUE(dest, NS_ERROR_OUT_OF_MEMORY);
dest += oldLen;
if (NS_InputStreamIsBuffered(mAsyncStream)) {
nsresult rv = mAsyncStream->ReadSegments(ReadFuncBinaryString, dest,
aCount, &bytesRead);
NS_ENSURE_SUCCESS(rv, rv);
} else {
while (aCount > 0) {
char tmpBuffer[4096];
uint32_t minCount =
XPCOM_MIN(aCount, static_cast<uint64_t>(sizeof(tmpBuffer)));
uint32_t read;
nsresult rv = mAsyncStream->Read(tmpBuffer, minCount, &read);
if (rv == NS_BASE_STREAM_CLOSED) {
rv = NS_OK;
}
NS_ENSURE_SUCCESS(rv, rv);
if (read == 0) {
// The stream finished too early.
return NS_ERROR_OUT_OF_MEMORY;
}
PopulateBufferForBinaryString(dest, tmpBuffer, read);
dest += read;
aCount -= read;
bytesRead += read;
}
}
MOZ_ASSERT(size.value() == oldLen + bytesRead);
mResult.Truncate(size.value());
}
else {
CheckedInt<uint64_t> size = mDataLen;
size += aCount;
//Update memory buffer to reflect the contents of the file
if (!size.isValid() ||
// PR_Realloc doesn't support over 4GB memory size even if 64-bit OS
// XXX: it's likely that this check is unnecessary and the comment is
// wrong because we no longer use PR_Realloc outside of NSPR and NSS.
size.value() > UINT32_MAX ||
size.value() > mTotal) {
return NS_ERROR_OUT_OF_MEMORY;
}
MOZ_DIAGNOSTIC_ASSERT(mFileData);
MOZ_RELEASE_ASSERT((mDataLen + aCount) <= mTotal);
nsresult rv = mAsyncStream->Read(mFileData + mDataLen, aCount, &bytesRead);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
mDataLen += bytesRead;
return NS_OK;
}
void
LossyConvertEncoding16to8::write_vmx(const char16_t* aSource,
uint32_t aSourceLength)
{
char* dest = mDestination;
// Align destination to a 16-byte boundary.
// We must use unsigned datatypes because aSourceLength is unsigned.
uint32_t i = 0;
uint32_t alignLen = XPCOM_MIN(aSourceLength, uint32_t(-NS_PTR_TO_INT32(dest) & 0xf));
// subtraction result can underflow if aSourceLength < alignLen!!!
// check for underflow
if (aSourceLength >= alignLen && aSourceLength - alignLen > 31) {
for (; i < alignLen; i++) {
dest[i] = static_cast<unsigned char>(aSource[i]);
}
// maxIndex can underflow if aSourceLength < 33!!!
uint32_t maxIndex = aSourceLength - 33;
// check for underflow
if (maxIndex <= aSourceLength && i < maxIndex) {
const char16_t *aOurSource = &aSource[i];
char *aOurDest = &dest[i];
register vector unsigned char packed1, packed2;
register vector unsigned short source1, source2, source3, source4;
if ((NS_PTR_TO_UINT32(aOurSource) & 15) == 0) {
// Walk 64 bytes (four VMX registers) at a time.
while (1) {
source1 = vec_ld(0, (unsigned short *)aOurSource);
source2 = vec_ld(16, (unsigned short *)aOurSource);
source3 = vec_ld(32, (unsigned short *)aOurSource);
source4 = vec_ld(48, (unsigned short *)aOurSource);
packed1 = vec_packsu(source1, source2);
packed2 = vec_packsu(source3, source4);
vec_st(packed1, 0, (unsigned char *)aOurDest);
vec_st(packed2, 16, (unsigned char *)aOurDest);
i += 32;
if(i > maxIndex)
break;
aOurDest += 32;
aOurSource += 32;
}
}
else {
register vector unsigned char mask = vec_lvsl(0, (unsigned short *)aOurSource);
register vector unsigned short vector1 = vec_ld(0, (unsigned short *)aOurSource);
register vector unsigned short vector2;
// Walk 64 bytes (four VMX registers) at a time.
while (1) {
LoadUnaligned(source1, 0, (unsigned short *)aOurSource, vector1, vector2, mask);
LoadUnaligned(source2, 16, (unsigned short *)aOurSource, vector2, vector1, mask);
LoadUnaligned(source3, 32, (unsigned short *)aOurSource, vector1, vector2, mask);
LoadUnaligned(source4, 48, (unsigned short *)aOurSource, vector2, vector1, mask);
packed1 = vec_packsu(source1, source2);
packed2 = vec_packsu(source3, source4);
vec_st(packed1, 0, (unsigned char *)aOurDest);
vec_st(packed2, 16, (unsigned char *)aOurDest);
i += 32;
if(i > maxIndex)
break;
aOurDest += 32;
aOurSource += 32;
}
}
}
}
// Finish up the rest.
for (; i < aSourceLength; i++) {
dest[i] = static_cast<unsigned char>(aSource[i]);
}
mDestination += i;
}
/**
* this function is called to prepare mData for writing. the given capacity
* indicates the required minimum storage size for mData, in sizeof(char_type)
* increments. this function returns true if the operation succeeds. it also
* returns the old data and old flags members if mData is newly allocated.
* the old data must be released by the caller.
*/
bool
nsTSubstring_CharT::MutatePrep( size_type capacity, char_type** oldData, uint32_t* oldFlags )
{
// initialize to no old data
*oldData = nullptr;
*oldFlags = 0;
size_type curCapacity = Capacity();
// If |capacity > kMaxCapacity|, then our doubling algorithm may not be
// able to allocate it. Just bail out in cases like that. We don't want
// to be allocating 2GB+ strings anyway.
PR_STATIC_ASSERT((sizeof(nsStringBuffer) & 0x1) == 0);
const size_type kMaxCapacity =
(size_type(-1)/2 - sizeof(nsStringBuffer)) / sizeof(char_type) - 2;
if (capacity > kMaxCapacity) {
// Also assert for |capacity| equal to |size_type(-1)|, since we used to
// use that value to flag immutability.
NS_ASSERTION(capacity != size_type(-1), "Bogus capacity");
return false;
}
// |curCapacity == 0| means that the buffer is immutable or 0-sized, so we
// need to allocate a new buffer. We cannot use the existing buffer even
// though it might be large enough.
if (curCapacity != 0)
{
if (capacity <= curCapacity) {
mFlags &= ~F_VOIDED; // mutation clears voided flag
return true;
}
// Use doubling algorithm when forced to increase available capacity.
size_type temp = curCapacity;
while (temp < capacity)
temp <<= 1;
NS_ASSERTION(XPCOM_MIN(temp, kMaxCapacity) >= capacity,
"should have hit the early return at the top");
capacity = XPCOM_MIN(temp, kMaxCapacity);
}
//
// several cases:
//
// (1) we have a shared buffer (mFlags & F_SHARED)
// (2) we have an owned buffer (mFlags & F_OWNED)
// (3) we have a fixed buffer (mFlags & F_FIXED)
// (4) we have a readonly buffer
//
// requiring that we in some cases preserve the data before creating
// a new buffer complicates things just a bit ;-)
//
size_type storageSize = (capacity + 1) * sizeof(char_type);
// case #1
if (mFlags & F_SHARED)
{
nsStringBuffer* hdr = nsStringBuffer::FromData(mData);
if (!hdr->IsReadonly())
{
nsStringBuffer *newHdr = nsStringBuffer::Realloc(hdr, storageSize);
if (!newHdr)
return false; // out-of-memory (original header left intact)
hdr = newHdr;
mData = (char_type*) hdr->Data();
mFlags &= ~F_VOIDED; // mutation clears voided flag
return true;
}
}
char_type* newData;
uint32_t newDataFlags;
// if we have a fixed buffer of sufficient size, then use it. this helps
// avoid heap allocations.
if ((mFlags & F_CLASS_FIXED) && (capacity < AsFixedString(this)->mFixedCapacity))
{
newData = AsFixedString(this)->mFixedBuf;
newDataFlags = F_TERMINATED | F_FIXED;
}
else
{
// if we reach here then, we must allocate a new buffer. we cannot
// make use of our F_OWNED or F_FIXED buffers because they are not
// large enough.
nsStringBuffer* newHdr = nsStringBuffer::Alloc(storageSize);
if (!newHdr)
return false; // we are still in a consistent state
newData = (char_type*) newHdr->Data();
newDataFlags = F_TERMINATED | F_SHARED;
}
// save old data and flags
*oldData = mData;
*oldFlags = mFlags;
mData = newData;
SetDataFlags(newDataFlags);
// mLength does not change
// though we are not necessarily terminated at the moment, now is probably
// still the best time to set F_TERMINATED.
return true;
}