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CFStream.c
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/*
* Copyright (c) 2015 Apple Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/* CFStream.c
Copyright (c) 2000-2014, Apple Inc. All rights reserved.
Responsibility: John Iarocci
*/
#include <CoreFoundation/CFRuntime.h>
#include <CoreFoundation/CFNumber.h>
#include <string.h>
#include "CFStreamInternal.h"
#include "CFInternal.h"
#include <stdio.h>
#if defined(DEBUG)
#include <assert.h>
#endif
struct _CFStream {
CFRuntimeBase _cfBase;
CFOptionFlags flags;
CFErrorRef error; // if callBacks->version < 2, this is actually a pointer to a CFStreamError
struct _CFStreamClient *client;
/* NOTE: CFNetwork is still using _CFStreamGetInfoPointer, and so this slot needs to stay in this position (as the fifth field in the structure) */
/* NOTE: This can be taken out once CFNetwork rebuilds */
/* NOTE: <rdar://problem/13678879> Remove comment once CFNetwork has been rebuilt */
void *info;
const struct _CFStreamCallBacks *callBacks; // This will not exist (will not be allocated) if the callbacks are from our known, "blessed" set.
CFLock_t streamLock;
CFArrayRef previousRunloopsAndModes;
dispatch_queue_t queue;
};
enum {
MIN_STATUS_CODE_BIT = 0,
// ..status bits...
MAX_STATUS_CODE_BIT = 4,
CONSTANT_CALLBACKS = 5,
CALLING_CLIENT = 6, // MUST remain 6 since it's value is used elsewhere.
HAVE_CLOSED = 7,
// Values above used to be defined and others may rely on their values
// Values below should not matter if they are re-ordered or shift
SHARED_SOURCE
};
/* CALLING_CLIENT really determines whether stream events will be sent to the client immediately, or posted for the next time through the runloop. Since the client may not be prepared for re-entrancy, we must always set/clear this bit around public entry points. -- REW, 9/5/2001
Also, CALLING_CLIENT is now used from CFFilteredStream.c (which has a copy of the #define above). Really gross. We should find a way to avoid that.... -- REW, 3/27/2002 */
// Used in CFNetwork too
/* sSharesSources holds two mappings, one the inverse of the other, between a stream and the
RunLoop+RunLoopMode pair that it's scheduled in. If the stream is scheduled in more than
one loop or mode, it can't share RunLoopSources with others, and is not in this dict.
*/
static CFLock_t sSourceLock = CFLockInit;
static CFMutableDictionaryRef sSharedSources = NULL;
static CFTypeID __kCFReadStreamTypeID = _kCFRuntimeNotATypeID;
static CFTypeID __kCFWriteStreamTypeID = _kCFRuntimeNotATypeID;
// Just reads the bits, for those cases where we don't want to go through any callback checking
#define __CFStreamGetStatus(x) __CFBitfieldGetValue((x)->flags, MAX_STATUS_CODE_BIT, MIN_STATUS_CODE_BIT)
CF_PRIVATE CFStreamStatus _CFStreamGetStatus(struct _CFStream *stream);
static Boolean _CFStreamRemoveRunLoopAndModeFromArray(CFMutableArrayRef runLoopsAndModes, CFRunLoopRef rl, CFStringRef mode);
static void _wakeUpRunLoop(struct _CFStream *stream);
CF_INLINE void checkRLMArray(CFArrayRef arr)
{
#if defined(DEBUG)
assert(arr == NULL || (CFArrayGetCount(arr) % 2) == 0);
#endif
}
CF_INLINE void _CFStreamLock(struct _CFStream* stream) {
__CFLock(&stream->streamLock);
}
CF_INLINE void _CFStreamUnlock(struct _CFStream* stream) {
__CFUnlock(&stream->streamLock);
}
CF_INLINE CFRunLoopSourceRef _CFStreamCopySource(struct _CFStream* stream) {
CFRunLoopSourceRef source = NULL;
if (stream) {
_CFStreamLock(stream);
if (stream->client)
source = stream->client->rlSource;
if (source)
CFRetain(source);
_CFStreamUnlock(stream);
}
return source;
}
CF_INLINE void _CFStreamSetSource(struct _CFStream* stream, CFRunLoopSourceRef source, Boolean invalidateOldSource) {
CFRunLoopSourceRef oldSource = NULL;
if (stream) {
_CFStreamLock(stream);
if (stream->client) {
oldSource = stream->client->rlSource;
if (oldSource != NULL)
CFRetain(oldSource);
stream->client->rlSource = source;
if (source != NULL)
CFRetain(source);
}
_CFStreamUnlock(stream);
}
if (oldSource) {
// Lose our extra retain
CFRelease(oldSource);
if (invalidateOldSource)
CFRunLoopSourceInvalidate(oldSource);
// And lose the one that held it in our stream as well
CFRelease(oldSource);
}
}
CF_INLINE const struct _CFStreamCallBacks *_CFStreamGetCallBackPtr(struct _CFStream *stream) {
return stream->callBacks;
}
CF_INLINE void _CFStreamSetStatusCode(struct _CFStream *stream, CFStreamStatus newStatus) {
CFStreamStatus status = __CFStreamGetStatus(stream);
if (((status != kCFStreamStatusClosed) && (status != kCFStreamStatusError)) ||
((status == kCFStreamStatusClosed) && (newStatus == kCFStreamStatusError)))
{
__CFBitfieldSetValue(stream->flags, MAX_STATUS_CODE_BIT, MIN_STATUS_CODE_BIT, newStatus);
}
}
CF_INLINE void _CFStreamScheduleEvent(struct _CFStream *stream, CFStreamEventType event) {
if (stream->client && (stream->client->when & event)) {
CFRunLoopSourceRef source = _CFStreamCopySource(stream);
if (source) {
stream->client->whatToSignal |= event;
CFRunLoopSourceSignal(source);
CFRelease(source);
_wakeUpRunLoop(stream);
}
}
}
CF_INLINE void _CFStreamSetStreamError(struct _CFStream *stream, CFStreamError *err) {
if (!stream->error) {
stream->error = (CFErrorRef)CFAllocatorAllocate(CFGetAllocator(stream), sizeof(CFStreamError), 0);
}
memmove((void *)stream->error, err, sizeof(CFStreamError));
}
static CFStringRef __CFStreamCopyDescription(CFTypeRef cf) {
struct _CFStream *stream = (struct _CFStream *)cf;
const struct _CFStreamCallBacks *cb = _CFStreamGetCallBackPtr(stream);
CFStringRef contextDescription;
CFStringRef desc;
if (cb->copyDescription) {
if (cb->version == 0) {
contextDescription = ((CFStringRef(*)(void *))cb->copyDescription)(_CFStreamGetInfoPointer(stream));
} else {
contextDescription = cb->copyDescription(stream, _CFStreamGetInfoPointer(stream));
}
} else {
contextDescription = CFStringCreateWithFormat(CFGetAllocator(stream), NULL, CFSTR("info = %p"), _CFStreamGetInfoPointer(stream));
}
if (CFGetTypeID(cf) == __kCFReadStreamTypeID) {
desc = CFStringCreateWithFormat(CFGetAllocator(stream), NULL, CFSTR("<CFReadStream %p>{%@}"), stream, contextDescription);
} else {
desc = CFStringCreateWithFormat(CFGetAllocator(stream), NULL, CFSTR("<CFWriteStream %p>{%@}"), stream, contextDescription);
}
CFRelease(contextDescription);
return desc;
}
static void _CFStreamDetachSource(struct _CFStream* stream) {
if (stream && stream->client && stream->client->rlSource) {
if (!__CFBitIsSet(stream->flags, SHARED_SOURCE)) {
_CFStreamSetSource(stream, NULL, TRUE);
}
else {
CFArrayRef runLoopAndSourceKey;
CFMutableArrayRef list;
CFIndex count;
CFIndex i;
__CFLock(&sSourceLock);
runLoopAndSourceKey = (CFArrayRef)CFDictionaryGetValue(sSharedSources, stream);
list = (CFMutableArrayRef)CFDictionaryGetValue(sSharedSources, runLoopAndSourceKey);
count = CFArrayGetCount(list);
i = CFArrayGetFirstIndexOfValue(list, CFRangeMake(0, count), stream);
if (i != kCFNotFound) {
CFArrayRemoveValueAtIndex(list, i);
count--;
}
CFAssert(CFArrayGetFirstIndexOfValue(list, CFRangeMake(0, CFArrayGetCount(list)), stream) == kCFNotFound, __kCFLogAssertion, "CFStreamClose: stream found twice in its shared source's list");
if (count == 0) {
CFRunLoopSourceRef source = _CFStreamCopySource(stream);
if (source) {
CFRunLoopRemoveSource((CFRunLoopRef)CFArrayGetValueAtIndex(runLoopAndSourceKey, 0), source, (CFStringRef)CFArrayGetValueAtIndex(runLoopAndSourceKey, 1));
CFRelease(source);
}
CFDictionaryRemoveValue(sSharedSources, runLoopAndSourceKey);
}
CFDictionaryRemoveValue(sSharedSources, stream);
_CFStreamSetSource(stream, NULL, count == 0);
__CFBitClear(stream->flags, SHARED_SOURCE);
__CFUnlock(&sSourceLock);
}
}
}
CF_PRIVATE void _CFStreamClose(struct _CFStream *stream) {
CFStreamStatus status = _CFStreamGetStatus(stream);
const struct _CFStreamCallBacks *cb = _CFStreamGetCallBackPtr(stream);
if (status == kCFStreamStatusNotOpen || status == kCFStreamStatusClosed || (status == kCFStreamStatusError && __CFBitIsSet(stream->flags, HAVE_CLOSED))) {
// Stream is not open from the client's perspective; do not callout and do not update our status to "closed"
return;
}
if (! __CFBitIsSet(stream->flags, HAVE_CLOSED)) {
__CFBitSet(stream->flags, HAVE_CLOSED);
__CFBitSet(stream->flags, CALLING_CLIENT);
if (cb->close) {
cb->close(stream, _CFStreamGetInfoPointer(stream));
}
if (stream->client) {
_CFStreamDetachSource(stream);
}
_CFStreamSetStatusCode(stream, kCFStreamStatusClosed);
__CFBitClear(stream->flags, CALLING_CLIENT);
}
}
//static int numStreamInstances = 0;
static void __CFStreamDeallocate(CFTypeRef cf) {
struct _CFStream *stream = (struct _CFStream *)cf;
const struct _CFStreamCallBacks *cb = _CFStreamGetCallBackPtr(stream);
CFAllocatorRef alloc = CFGetAllocator(stream);
// numStreamInstances --;
// Close the stream
_CFStreamClose(stream);
if (stream->client) {
CFStreamClientContext *cbContext;
cbContext = &(stream->client->cbContext);
if (cbContext->info && cbContext->release) {
cbContext->release(cbContext->info);
}
if (stream->client->runLoopsAndModes) {
CFRelease(stream->client->runLoopsAndModes);
}
CFAllocatorDeallocate(alloc, stream->client);
stream->client = NULL; // Just in case finalize, below, calls back in to us
}
if (cb->finalize) {
if (cb->version == 0) {
((void(*)(void *))cb->finalize)(_CFStreamGetInfoPointer(stream));
} else {
cb->finalize(stream, _CFStreamGetInfoPointer(stream));
}
}
if (stream->error) {
if (cb->version < 2) {
CFAllocatorDeallocate(alloc, (void *)stream->error);
} else {
CFRelease(stream->error);
}
}
if (!__CFBitIsSet(stream->flags, CONSTANT_CALLBACKS)) {
CFAllocatorDeallocate(alloc, (void *)stream->callBacks);
}
if (stream->previousRunloopsAndModes) {
CFRelease(stream->previousRunloopsAndModes);
stream->previousRunloopsAndModes = NULL;
}
if (stream->queue) {
dispatch_release(stream->queue);
stream->queue = NULL;
}
}
static const CFRuntimeClass __CFReadStreamClass = {
0,
"CFReadStream",
NULL, // init
NULL, // copy
__CFStreamDeallocate,
NULL,
NULL,
NULL, // copyHumanDesc
__CFStreamCopyDescription
};
static const CFRuntimeClass __CFWriteStreamClass = {
0,
"CFWriteStream",
NULL, // init
NULL, // copy
__CFStreamDeallocate,
NULL,
NULL,
NULL, // copyHumanDesc
__CFStreamCopyDescription
};
CONST_STRING_DECL(kCFStreamPropertySocketNativeHandle, "kCFStreamPropertySocketNativeHandle")
CONST_STRING_DECL(kCFStreamPropertySocketRemoteHostName, "kCFStreamPropertySocketRemoteHostName")
CONST_STRING_DECL(kCFStreamPropertySocketRemotePortNumber, "kCFStreamPropertySocketRemotePortNumber")
CONST_STRING_DECL(kCFStreamPropertyDataWritten, "kCFStreamPropertyDataWritten")
CONST_STRING_DECL(kCFStreamPropertyAppendToFile, "kCFStreamPropertyAppendToFile")
CF_PRIVATE void __CFStreamInitialize(void) {
static dispatch_once_t initOnce;
dispatch_once(&initOnce, ^{ __kCFReadStreamTypeID = _CFRuntimeRegisterClass(&__CFReadStreamClass); __kCFWriteStreamTypeID = _CFRuntimeRegisterClass(&__CFWriteStreamClass); });
}
CF_EXPORT CFTypeID CFReadStreamGetTypeID(void) {
return __kCFReadStreamTypeID;
}
CF_EXPORT CFTypeID CFWriteStreamGetTypeID(void) {
return __kCFWriteStreamTypeID;
}
static struct _CFStream *_CFStreamCreate(CFAllocatorRef allocator, Boolean isReadStream) {
struct _CFStream *newStream = (struct _CFStream *)_CFRuntimeCreateInstance(allocator, isReadStream ? __kCFReadStreamTypeID : __kCFWriteStreamTypeID, sizeof(struct _CFStream) - sizeof(CFRuntimeBase), NULL);
if (newStream) {
// numStreamInstances ++;
newStream->flags = 0;
_CFStreamSetStatusCode(newStream, kCFStreamStatusNotOpen);
newStream->error = NULL;
newStream->client = NULL;
newStream->info = NULL;
newStream->callBacks = NULL;
newStream->streamLock = CFLockInit;
newStream->previousRunloopsAndModes = NULL;
newStream->queue = NULL;
}
return newStream;
}
CF_EXPORT void* _CFStreamGetInfoPointer(struct _CFStream* stream) {
return stream == NULL? NULL : stream->info;
}
CF_PRIVATE struct _CFStream *_CFStreamCreateWithConstantCallbacks(CFAllocatorRef alloc, void *info, const struct _CFStreamCallBacks *cb, Boolean isReading) {
struct _CFStream *newStream;
if (cb->version != 1) return NULL;
newStream = _CFStreamCreate(alloc, isReading);
if (newStream) {
__CFBitSet(newStream->flags, CONSTANT_CALLBACKS);
newStream->callBacks = cb;
if (cb->create) {
newStream->info = cb->create(newStream, info);
} else {
newStream->info = info;
}
}
return newStream;
}
CF_EXPORT void _CFStreamSetInfoPointer(struct _CFStream *stream, void *info, const struct _CFStreamCallBacks *cb) {
if (info != stream->info) {
if (stream->callBacks->finalize) {
stream->callBacks->finalize(stream, stream->info);
}
if (cb->create) {
stream->info = cb->create(stream, info);
} else {
stream->info = info;
}
}
stream->callBacks = cb;
}
CF_EXPORT CFReadStreamRef CFReadStreamCreate(CFAllocatorRef alloc, const CFReadStreamCallBacks *callbacks, void *info) {
struct _CFStream *newStream = _CFStreamCreate(alloc, TRUE);
struct _CFStreamCallBacks *cb;
if (!newStream) return NULL;
cb = (struct _CFStreamCallBacks *)CFAllocatorAllocate(alloc, sizeof(struct _CFStreamCallBacks), 0);
if (!cb) {
CFRelease(newStream);
return NULL;
}
if (callbacks->version == 0) {
CFReadStreamCallBacksV0 *cbV0 = (CFReadStreamCallBacksV0 *)callbacks;
CFStreamClientContext *ctxt = (CFStreamClientContext *)info;
newStream->info = ctxt->retain ? (void *)ctxt->retain(ctxt->info) : ctxt->info;
cb->version = 0;
cb->create = (void *(*)(struct _CFStream *, void *))ctxt->retain;
cb->finalize = (void(*)(struct _CFStream *, void *))ctxt->release;
cb->copyDescription = (CFStringRef(*)(struct _CFStream *, void *))ctxt->copyDescription;
cb->open = (Boolean(*)(struct _CFStream *, CFErrorRef *, Boolean *, void *))cbV0->open;
cb->openCompleted = (Boolean (*)(struct _CFStream *, CFErrorRef *, void *))cbV0->openCompleted;
cb->read = (CFIndex (*)(CFReadStreamRef, UInt8 *, CFIndex, CFErrorRef *, Boolean *, void *))cbV0->read;
cb->getBuffer = (const UInt8 *(*)(CFReadStreamRef, CFIndex, CFIndex *, CFErrorRef *, Boolean *, void *))cbV0->getBuffer;
cb->canRead = (Boolean (*)(CFReadStreamRef, CFErrorRef*, void*))cbV0->canRead;
cb->write = NULL;
cb->canWrite = NULL;
cb->close = (void (*)(struct _CFStream *, void *))cbV0->close;
cb->copyProperty = (CFTypeRef (*)(struct _CFStream *, CFStringRef, void *))cbV0->copyProperty;
cb->setProperty = NULL;
cb->requestEvents = NULL;
cb->schedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV0->schedule;
cb->unschedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV0->unschedule;
} else if (callbacks->version == 1) {
CFReadStreamCallBacksV1 *cbV1 = (CFReadStreamCallBacksV1 *)callbacks;
newStream->info = cbV1->create ? cbV1->create((CFReadStreamRef)newStream, info) : info;
cb->version = 1;
cb->create = (void *(*)(struct _CFStream *, void *))cbV1->create;
cb->finalize = (void(*)(struct _CFStream *, void *))cbV1->finalize;
cb->copyDescription = (CFStringRef(*)(struct _CFStream *, void *))cbV1->copyDescription;
cb->open = (Boolean(*)(struct _CFStream *, CFErrorRef *, Boolean *, void *))cbV1->open;
cb->openCompleted = (Boolean (*)(struct _CFStream *, CFErrorRef *, void *))cbV1->openCompleted;
cb->read = (CFIndex (*)(CFReadStreamRef, UInt8 *, CFIndex, CFErrorRef *, Boolean *, void *))cbV1->read;
cb->getBuffer = (const UInt8 *(*)(CFReadStreamRef, CFIndex, CFIndex *, CFErrorRef *, Boolean *, void *))cbV1->getBuffer;
cb->canRead = (Boolean (*)(CFReadStreamRef, CFErrorRef*, void*))cbV1->canRead;
cb->write = NULL;
cb->canWrite = NULL;
cb->close = (void (*)(struct _CFStream *, void *))cbV1->close;
cb->copyProperty = (CFTypeRef (*)(struct _CFStream *, CFStringRef, void *))cbV1->copyProperty;
cb->setProperty = (Boolean(*)(struct _CFStream *, CFStringRef, CFTypeRef, void *))cbV1->setProperty;
cb->requestEvents = (void(*)(struct _CFStream *, CFOptionFlags, void *))cbV1->requestEvents;
cb->schedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV1->schedule;
cb->unschedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV1->unschedule;
} else {
newStream->info = callbacks->create ? callbacks->create((CFReadStreamRef)newStream, info) : info;
cb->version = 2;
cb->create = (void *(*)(struct _CFStream *, void *))callbacks->create;
cb->finalize = (void(*)(struct _CFStream *, void *))callbacks->finalize;
cb->copyDescription = (CFStringRef(*)(struct _CFStream *, void *))callbacks->copyDescription;
cb->open = (Boolean(*)(struct _CFStream *, CFErrorRef *, Boolean *, void *))callbacks->open;
cb->openCompleted = (Boolean (*)(struct _CFStream *, CFErrorRef *, void *))callbacks->openCompleted;
cb->read = callbacks->read;
cb->getBuffer = callbacks->getBuffer;
cb->canRead = callbacks->canRead;
cb->write = NULL;
cb->canWrite = NULL;
cb->close = (void (*)(struct _CFStream *, void *))callbacks->close;
cb->copyProperty = (CFTypeRef (*)(struct _CFStream *, CFStringRef, void *))callbacks->copyProperty;
cb->setProperty = (Boolean(*)(struct _CFStream *, CFStringRef, CFTypeRef, void *))callbacks->setProperty;
cb->requestEvents = (void(*)(struct _CFStream *, CFOptionFlags, void *))callbacks->requestEvents;
cb->schedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))callbacks->schedule;
cb->unschedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))callbacks->unschedule;
}
newStream->callBacks = cb;
return (CFReadStreamRef)newStream;
}
CF_EXPORT CFWriteStreamRef CFWriteStreamCreate(CFAllocatorRef alloc, const CFWriteStreamCallBacks *callbacks, void *info) {
struct _CFStream *newStream = _CFStreamCreate(alloc, FALSE);
struct _CFStreamCallBacks *cb;
if (!newStream) return NULL;
cb = (struct _CFStreamCallBacks *)CFAllocatorAllocate(alloc, sizeof(struct _CFStreamCallBacks), 0);
if (!cb) {
CFRelease(newStream);
return NULL;
}
if (callbacks->version == 0) {
CFWriteStreamCallBacksV0 *cbV0 = (CFWriteStreamCallBacksV0 *)callbacks;
CFStreamClientContext *ctxt = (CFStreamClientContext *)info;
newStream->info = ctxt->retain ? (void *)ctxt->retain(ctxt->info) : ctxt->info;
cb->version = 0;
cb->create = (void *(*)(struct _CFStream *, void *))ctxt->retain;
cb->finalize = (void(*)(struct _CFStream *, void *))ctxt->release;
cb->copyDescription = (CFStringRef(*)(struct _CFStream *, void *))ctxt->copyDescription;
cb->open = (Boolean(*)(struct _CFStream *, CFErrorRef *, Boolean *, void *))cbV0->open;
cb->openCompleted = (Boolean (*)(struct _CFStream *, CFErrorRef *, void *))cbV0->openCompleted;
cb->read = NULL;
cb->getBuffer = NULL;
cb->canRead = NULL;
cb->write = (CFIndex(*)(CFWriteStreamRef stream, const UInt8 *buffer, CFIndex bufferLength, CFErrorRef *error, void *info))cbV0->write;
cb->canWrite = (Boolean(*)(CFWriteStreamRef stream, CFErrorRef *error, void *info))cbV0->canWrite;
cb->close = (void (*)(struct _CFStream *, void *))cbV0->close;
cb->copyProperty = (CFTypeRef (*)(struct _CFStream *, CFStringRef, void *))cbV0->copyProperty;
cb->setProperty = NULL;
cb->requestEvents = NULL;
cb->schedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV0->schedule;
cb->unschedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV0->unschedule;
} else if (callbacks->version == 1) {
CFWriteStreamCallBacksV1 *cbV1 = (CFWriteStreamCallBacksV1 *)callbacks;
cb->version = 1;
newStream->info = cbV1->create ? cbV1->create((CFWriteStreamRef)newStream, info) : info;
cb->create = (void *(*)(struct _CFStream *, void *))cbV1->create;
cb->finalize = (void(*)(struct _CFStream *, void *))cbV1->finalize;
cb->copyDescription = (CFStringRef(*)(struct _CFStream *, void *))cbV1->copyDescription;
cb->open = (Boolean(*)(struct _CFStream *, CFErrorRef *, Boolean *, void *))cbV1->open;
cb->openCompleted = (Boolean (*)(struct _CFStream *, CFErrorRef *, void *))cbV1->openCompleted;
cb->read = NULL;
cb->getBuffer = NULL;
cb->canRead = NULL;
cb->write = (CFIndex(*)(CFWriteStreamRef stream, const UInt8 *buffer, CFIndex bufferLength, CFErrorRef *error, void *info))cbV1->write;
cb->canWrite = (Boolean(*)(CFWriteStreamRef stream, CFErrorRef *error, void *info))cbV1->canWrite;
cb->close = (void (*)(struct _CFStream *, void *))cbV1->close;
cb->copyProperty = (CFTypeRef (*)(struct _CFStream *, CFStringRef, void *))cbV1->copyProperty;
cb->setProperty = (Boolean (*)(struct _CFStream *, CFStringRef, CFTypeRef, void *))cbV1->setProperty;
cb->requestEvents = (void(*)(struct _CFStream *, CFOptionFlags, void *))cbV1->requestEvents;
cb->schedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV1->schedule;
cb->unschedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))cbV1->unschedule;
} else {
cb->version = callbacks->version;
newStream->info = callbacks->create ? callbacks->create((CFWriteStreamRef)newStream, info) : info;
cb->create = (void *(*)(struct _CFStream *, void *))callbacks->create;
cb->finalize = (void(*)(struct _CFStream *, void *))callbacks->finalize;
cb->copyDescription = (CFStringRef(*)(struct _CFStream *, void *))callbacks->copyDescription;
cb->open = (Boolean(*)(struct _CFStream *, CFErrorRef *, Boolean *, void *))callbacks->open;
cb->openCompleted = (Boolean (*)(struct _CFStream *, CFErrorRef *, void *))callbacks->openCompleted;
cb->read = NULL;
cb->getBuffer = NULL;
cb->canRead = NULL;
cb->write = callbacks->write;
cb->canWrite = callbacks->canWrite;
cb->close = (void (*)(struct _CFStream *, void *))callbacks->close;
cb->copyProperty = (CFTypeRef (*)(struct _CFStream *, CFStringRef, void *))callbacks->copyProperty;
cb->setProperty = (Boolean (*)(struct _CFStream *, CFStringRef, CFTypeRef, void *))callbacks->setProperty;
cb->requestEvents = (void(*)(struct _CFStream *, CFOptionFlags, void *))callbacks->requestEvents;
cb->schedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))callbacks->schedule;
cb->unschedule = (void (*)(struct _CFStream *, CFRunLoopRef, CFStringRef, void *))callbacks->unschedule;
}
newStream->callBacks = cb;
return (CFWriteStreamRef)newStream;
}
static void _signalEventSync(struct _CFStream* stream, CFOptionFlags whatToSignal)
{
CFOptionFlags eventMask;
__CFBitSet(stream->flags, CALLING_CLIENT);
_CFStreamLock(stream);
struct _CFStreamClient* client = stream->client;
if (client == NULL) {
_CFStreamUnlock(stream);
} else {
void* info = NULL;
void (*release) (void*) = NULL;
void (*cb)(struct _CFStream *, CFStreamEventType, void *) = client == NULL? NULL : client->cb;
if (stream->client->cbContext.retain == NULL)
info = stream->client->cbContext.info;
else {
info = stream->client->cbContext.retain(stream->client->cbContext.info);
release = stream->client->cbContext.release;
}
_CFStreamUnlock(stream);
for (eventMask = 1; eventMask <= whatToSignal; eventMask = eventMask << 1) {
_CFStreamLock(stream);
Boolean shouldSignal = ((eventMask & whatToSignal) && stream->client && (stream->client->when & eventMask));
_CFStreamUnlock(stream);
if (shouldSignal && client) {
cb(stream, eventMask, info);
/* What happens if the callback sets the client to NULL? We're in a loop here... Hmm. */
/* After writing that comment, I see: <rdar://problem/6793636> CFReadStreamSetClient(..., NULL) unsafely releases info pointer immediately */
/* Of note, when the stream callbacks are set to to NULL, we're re-initalized so as not to receive more events, so we
* should break pout of this loop */
}
}
if (release)
(*release) (info);
}
__CFBitClear(stream->flags, CALLING_CLIENT);
}
static void _signalEventQueue(dispatch_queue_t q, struct _CFStream* stream, CFOptionFlags whatToSignal)
{
CFRetain(stream);
dispatch_async(q, ^{
_signalEventSync(stream, whatToSignal);
CFRelease(stream);
});
}
static void _cfstream_solo_signalEventSync(void* info)
{
CFTypeID typeID = CFGetTypeID((CFTypeRef) info);
if (typeID != CFReadStreamGetTypeID() && typeID != CFWriteStreamGetTypeID()) {
CFLog(__kCFLogAssertion, CFSTR("Expected a read or write stream for %p"), info);
#if defined(DEBUG)
abort();
#endif
} else {
struct _CFStream* stream = (struct _CFStream*) info;
_CFStreamLock(stream);
CFOptionFlags whatToSignal = stream->client->whatToSignal;
stream->client->whatToSignal = 0;
dispatch_queue_t queue = stream->queue;
if (queue) dispatch_retain(queue);
CFRetain(stream);
_CFStreamUnlock(stream);
/* Since the array version holds a retain, we do it here as well, as opposed to taking a second retain in the client callback */
if (queue == 0)
_signalEventSync(stream, whatToSignal);
else {
_signalEventQueue(queue, stream, whatToSignal);
dispatch_release(queue);
}
CFRelease(stream);
}
}
static void _cfstream_shared_signalEventSync(void* info)
{
CFTypeID typeID = CFGetTypeID((CFTypeRef) info);
if (typeID != CFArrayGetTypeID()) {
CFLog(__kCFLogAssertion, CFSTR("Expected an array for %p"), info);
#if defined(DEBUG)
abort();
#endif
} else {
CFMutableArrayRef list = (CFMutableArrayRef) info;
CFIndex c, i;
CFOptionFlags whatToSignal = 0;
dispatch_queue_t queue = 0;
struct _CFStream* stream = NULL;
__CFLock(&sSourceLock);
/* Looks like, we grab the first stream that wants an event... */
/* Note that I grab an extra retain when I pull out the stream here... */
c = CFArrayGetCount(list);
for (i = 0; i < c; i++) {
struct _CFStream* s = (struct _CFStream*)CFArrayGetValueAtIndex(list, i);
if (s->client->whatToSignal) {
stream = s;
CFRetain(stream);
whatToSignal = stream->client->whatToSignal;
s->client->whatToSignal = 0;
queue = stream->queue;
if (queue) dispatch_retain(queue);
break;
}
}
/* And then we also signal any other streams in this array so that we get them next go? */
for (; i < c; i++) {
struct _CFStream* s = (struct _CFStream*)CFArrayGetValueAtIndex(list, i);
if (s->client->whatToSignal) {
CFRunLoopSourceRef source = _CFStreamCopySource(s);
if (source) {
CFRunLoopSourceSignal(source);
CFRelease(source);
}
break;
}
}
__CFUnlock(&sSourceLock);
/* We're sitting here now, possibly with a stream that needs to be processed by the common routine */
if (stream) {
if (queue == 0)
_signalEventSync(stream, whatToSignal);
else {
_signalEventQueue(queue, stream, whatToSignal);
dispatch_release(queue);
}
/* Lose our extra retain */
CFRelease(stream);
}
}
}
/* This routine is to be considered unsafe... */
static CFArrayRef _CFStreamGetRunLoopsAndModes(struct _CFStream *stream)
{
CFArrayRef result = NULL;
if (stream && stream->client) {
_CFStreamLock(stream);
if (stream->previousRunloopsAndModes) {
CFRelease(stream->previousRunloopsAndModes);
stream->previousRunloopsAndModes = NULL;
}
if (stream->client->runLoopsAndModes) {
stream->previousRunloopsAndModes = CFArrayCreateCopy(CFGetAllocator(stream), stream->client->runLoopsAndModes);
}
result = stream->previousRunloopsAndModes;
checkRLMArray(result);
_CFStreamUnlock(stream);
}
return result;
}
static CFArrayRef _CFStreamCopyRunLoopsAndModes(struct _CFStream *stream)
{
CFArrayRef result = NULL;
if (stream && stream->client) {
_CFStreamLock(stream);
if (stream->client->runLoopsAndModes) {
result = CFArrayCreateCopy(CFGetAllocator(stream), stream->client->runLoopsAndModes);
}
checkRLMArray(result);
_CFStreamUnlock(stream);
}
return result;
}
static void _wakeUpRunLoop(struct _CFStream *stream) {
CFArrayRef rlArray = _CFStreamCopyRunLoopsAndModes(stream);
if (rlArray) {
CFIndex cnt = CFArrayGetCount(rlArray);
CFRunLoopRef rl = NULL;
if (cnt == 2) {
rl = (CFRunLoopRef)CFArrayGetValueAtIndex(rlArray, 0);
} else if (cnt > 2) {
CFIndex idx;
rl = (CFRunLoopRef)CFArrayGetValueAtIndex(rlArray, 0);
for (idx = 2; NULL != rl && idx < cnt; idx+=2) {
CFRunLoopRef value = (CFRunLoopRef)CFArrayGetValueAtIndex(rlArray, idx);
if (value != rl) rl = NULL;
}
if (NULL == rl) { /* more than one different rl, so we must pick one */
for (idx = 0; idx < cnt; idx+=2) {
CFRunLoopRef value = (CFRunLoopRef)CFArrayGetValueAtIndex(rlArray, idx);
CFStringRef currentMode = CFRunLoopCopyCurrentMode(value);
if (NULL != currentMode && CFEqual(currentMode, CFArrayGetValueAtIndex(rlArray, idx+1)) && CFRunLoopIsWaiting(value)) {
CFRelease(currentMode);
rl = value;
break;
}
if (NULL != currentMode) CFRelease(currentMode);
}
if (NULL == rl) { /* didn't choose one above, so choose first */
rl = (CFRunLoopRef)CFArrayGetValueAtIndex(rlArray, 0);
}
}
}
if (NULL != rl && CFRunLoopIsWaiting(rl))
CFRunLoopWakeUp(rl);
CFRelease(rlArray);
}
}
CF_PRIVATE void _CFStreamSignalEvent(struct _CFStream *stream, CFStreamEventType event, CFErrorRef error, Boolean synchronousAllowed) {
// Update our internal status; we must use the primitive __CFStreamGetStatus(), because CFStreamGetStatus() calls us, and we can end up in an infinite loop.
CFStreamStatus status = __CFStreamGetStatus(stream);
// Sanity check the event
if (status == kCFStreamStatusNotOpen) {
// No events allowed; this is almost certainly a bug in the stream's implementation
CFLog(__kCFLogAssertion, CFSTR("Stream %p is sending an event before being opened"), stream);
event = 0;
} else if (status == kCFStreamStatusClosed || status == kCFStreamStatusError) {
// no further events are allowed
event = 0;
} else if (status == kCFStreamStatusAtEnd) {
// Only error events are allowed
event &= kCFStreamEventErrorOccurred;
} else if (status != kCFStreamStatusOpening) {
// cannot send open completed; that happened already
event &= ~kCFStreamEventOpenCompleted;
}
// Change status if appropriate
if (event & kCFStreamEventOpenCompleted && status == kCFStreamStatusOpening) {
_CFStreamSetStatusCode(stream, kCFStreamStatusOpen);
}
if (event & kCFStreamEventEndEncountered && status < kCFStreamStatusAtEnd) {
_CFStreamSetStatusCode(stream, kCFStreamStatusAtEnd);
}
if (event & kCFStreamEventErrorOccurred) {
if (_CFStreamGetCallBackPtr(stream)->version < 2) {
_CFStreamSetStreamError(stream, (CFStreamError *)error);
} else {
CFAssert(error, __kCFLogAssertion, "CFStream: kCFStreamEventErrorOccurred signalled, but error is NULL!");
CFRetain(error);
if (stream->error) CFRelease(stream->error);
stream->error = error;
}
_CFStreamSetStatusCode(stream, kCFStreamStatusError);
}
// Now signal any pertinent event
if (stream->client && (stream->client->when & event) != 0) {
CFRunLoopSourceRef source = _CFStreamCopySource(stream);
if (source) {
Boolean signalNow = FALSE;
stream->client->whatToSignal |= event;
if (synchronousAllowed && !__CFBitIsSet(stream->flags, CALLING_CLIENT)) {
CFRunLoopRef rl = CFRunLoopGetCurrent();
CFStringRef mode = CFRunLoopCopyCurrentMode(rl);
if (mode) {
if (CFRunLoopContainsSource(rl, source, mode))
signalNow = TRUE;
}
if (mode)
CFRelease(mode);
}
if (signalNow) {
// Can call out safely right now
_cfstream_solo_signalEventSync(stream);
} else {
// Schedule for later delivery
if (source) {
CFRunLoopSourceSignal(source);
}
_wakeUpRunLoop(stream);
}
CFRelease(source);
}
}
}
CF_PRIVATE CFStreamStatus _CFStreamGetStatus(struct _CFStream *stream) {
CFStreamStatus status = __CFStreamGetStatus(stream);
// Status code just represents the value when last we checked; if we were in the middle of doing work at that time, we need to find out if the work has completed, now. If we find out about a status change, we need to inform the client as well, so we call _CFStreamSignalEvent. This will take care of updating our internal status correctly, too.
__CFBitSet(stream->flags, CALLING_CLIENT);
if (status == kCFStreamStatusOpening) {
const struct _CFStreamCallBacks *cb = _CFStreamGetCallBackPtr(stream);
if (cb->openCompleted) {
Boolean isComplete;
if (cb->version < 2) {
CFStreamError err = {0, 0};
isComplete = ((_CFStreamCBOpenCompletedV1)(cb->openCompleted))(stream, &err, _CFStreamGetInfoPointer(stream));
if (err.error != 0) _CFStreamSetStreamError(stream, &err);
} else {
isComplete = cb->openCompleted(stream, &(stream->error), _CFStreamGetInfoPointer(stream));
}
if (isComplete) {
if (!stream->error) {
status = kCFStreamStatusOpen;
} else {
status = kCFStreamStatusError;
}
_CFStreamSetStatusCode(stream, status);
if (status == kCFStreamStatusOpen) {
_CFStreamScheduleEvent(stream, kCFStreamEventOpenCompleted);
} else {
_CFStreamScheduleEvent(stream, kCFStreamEventErrorOccurred);
}
}
}
}
__CFBitClear(stream->flags, CALLING_CLIENT);
return status;
}
CF_EXPORT CFStreamStatus CFReadStreamGetStatus(CFReadStreamRef stream) {
CF_OBJC_FUNCDISPATCHV(__kCFReadStreamTypeID, CFStreamStatus, (NSInputStream *)stream, streamStatus);
return _CFStreamGetStatus((struct _CFStream *)stream);
}
CF_EXPORT CFStreamStatus CFWriteStreamGetStatus(CFWriteStreamRef stream) {
CF_OBJC_FUNCDISPATCHV(__kCFWriteStreamTypeID, CFStreamStatus, (NSOutputStream *)stream, streamStatus);
return _CFStreamGetStatus((struct _CFStream *)stream);
}
static CFStreamError _CFStreamGetStreamError(struct _CFStream *stream) {
CFStreamError result;
if (!stream->error) {
result.error = 0;
result.domain = 0;
} else if (_CFStreamGetCallBackPtr(stream)->version < 2) {
CFStreamError *streamError = (CFStreamError *)(stream->error);
result.error = streamError->error;
result.domain = streamError->domain;
} else {
result = _CFStreamErrorFromError(stream->error);
}
return result;
}
CF_EXPORT CFStreamError CFReadStreamGetError(CFReadStreamRef stream) {
CF_OBJC_FUNCDISPATCHV(__kCFReadStreamTypeID, CFStreamError, (NSInputStream *)stream, _cfStreamError);
return _CFStreamGetStreamError((struct _CFStream *)stream);
}
CF_EXPORT CFStreamError CFWriteStreamGetError(CFWriteStreamRef stream) {
CF_OBJC_FUNCDISPATCHV(__kCFWriteStreamTypeID, CFStreamError, (NSOutputStream *)stream, _cfStreamError);
return _CFStreamGetStreamError((struct _CFStream *)stream);
}
static CFErrorRef _CFStreamCopyError(struct _CFStream *stream) {
if (!stream->error) {
return NULL;
} else if (_CFStreamGetCallBackPtr(stream)->version < 2) {
return _CFErrorFromStreamError(CFGetAllocator(stream), (CFStreamError *)(stream->error));
} else {
CFRetain(stream->error);
return stream->error;
}
}
CF_EXPORT CFErrorRef CFReadStreamCopyError(CFReadStreamRef stream) {
CF_OBJC_FUNCDISPATCHV(__kCFReadStreamTypeID, CFErrorRef, (NSInputStream *)stream, streamError);
return _CFStreamCopyError((struct _CFStream *)stream);
}
CF_EXPORT CFErrorRef CFWriteStreamCopyError(CFWriteStreamRef stream) {
return _CFStreamCopyError((struct _CFStream *)stream);
CF_OBJC_FUNCDISPATCHV(__kCFWriteStreamTypeID, CFErrorRef, (NSOutputStream *)stream, streamError);
}
CF_PRIVATE Boolean _CFStreamOpen(struct _CFStream *stream) {
const struct _CFStreamCallBacks *cb = _CFStreamGetCallBackPtr(stream);
Boolean success, openComplete;
if (_CFStreamGetStatus(stream) != kCFStreamStatusNotOpen) {
return FALSE;
}
__CFBitSet(stream->flags, CALLING_CLIENT);
_CFStreamSetStatusCode(stream, kCFStreamStatusOpening);
if (cb->open) {
if (cb->version < 2) {
CFStreamError err = {0, 0};
success = ((_CFStreamCBOpenV1)(cb->open))(stream, &err, &openComplete, _CFStreamGetInfoPointer(stream));
if (err.error != 0) _CFStreamSetStreamError(stream, &err);
} else {
success = cb->open(stream, &(stream->error), &openComplete, _CFStreamGetInfoPointer(stream));
}
} else {
success = TRUE;
openComplete = TRUE;
}
if (openComplete) {
if (success) {
// 2957690 - Guard against the possibility that the stream has already signalled itself in to a later state (like AtEnd)
if (__CFStreamGetStatus(stream) == kCFStreamStatusOpening) {
_CFStreamSetStatusCode(stream, kCFStreamStatusOpen);
}
_CFStreamScheduleEvent(stream, kCFStreamEventOpenCompleted);
} else {
#if DEPLOYMENT_TARGET_WINDOWS
_CFStreamClose(stream);
#endif
_CFStreamSetStatusCode(stream, kCFStreamStatusError);
_CFStreamScheduleEvent(stream, kCFStreamEventErrorOccurred);
}
}