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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkData.h"
#include "SkOSFile.h"
#include "SkOnce.h"
#include "SkReadBuffer.h"
#include "SkStream.h"
#include "SkWriteBuffer.h"
SkData::SkData(const void* ptr, size_t size, ReleaseProc proc, void* context) {
fPtr = const_cast<void*>(ptr);
fSize = size;
fReleaseProc = proc;
fReleaseProcContext = context;
}
/** This constructor means we are inline with our fPtr's contents.
* Thus we set fPtr to point right after this.
*/
SkData::SkData(size_t size) {
fPtr = (char*)(this + 1); // contents are immediately after this
fSize = size;
fReleaseProc = nullptr;
fReleaseProcContext = nullptr;
}
SkData::~SkData() {
if (fReleaseProc) {
fReleaseProc(fPtr, fReleaseProcContext);
}
}
bool SkData::equals(const SkData* other) const {
if (nullptr == other) {
return false;
}
return fSize == other->fSize && !memcmp(fPtr, other->fPtr, fSize);
}
size_t SkData::copyRange(size_t offset, size_t length, void* buffer) const {
size_t available = fSize;
if (offset >= available || 0 == length) {
return 0;
}
available -= offset;
if (length > available) {
length = available;
}
SkASSERT(length > 0);
memcpy(buffer, this->bytes() + offset, length);
return length;
}
sk_sp<SkData> SkData::PrivateNewWithCopy(const void* srcOrNull, size_t length) {
if (0 == length) {
return SkData::MakeEmpty();
}
const size_t actualLength = length + sizeof(SkData);
SkASSERT_RELEASE(length < actualLength); // Check for overflow.
void* storage = ::operator new (actualLength);
sk_sp<SkData> data(new (storage) SkData(length));
if (srcOrNull) {
memcpy(data->writable_data(), srcOrNull, length);
}
return data;
}
void SkData::DummyReleaseProc(const void*, void*) {}
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkData> SkData::MakeEmpty() {
static SkOnce once;
static SkData* empty;
once([]{ empty = new SkData(nullptr, 0, nullptr, nullptr); });
return sk_ref_sp(empty);
}
// assumes fPtr was allocated via sk_malloc
static void sk_free_releaseproc(const void* ptr, void*) {
sk_free((void*)ptr);
}
sk_sp<SkData> SkData::MakeFromMalloc(const void* data, size_t length) {
return sk_sp<SkData>(new SkData(data, length, sk_free_releaseproc, nullptr));
}
sk_sp<SkData> SkData::MakeWithCopy(const void* src, size_t length) {
SkASSERT(src);
return PrivateNewWithCopy(src, length);
}
sk_sp<SkData> SkData::MakeUninitialized(size_t length) {
return PrivateNewWithCopy(nullptr, length);
}
sk_sp<SkData> SkData::MakeWithProc(const void* ptr, size_t length, ReleaseProc proc, void* ctx) {
return sk_sp<SkData>(new SkData(ptr, length, proc, ctx));
}
// assumes fPtr was allocated with sk_fmmap
static void sk_mmap_releaseproc(const void* addr, void* ctx) {
size_t length = reinterpret_cast<size_t>(ctx);
sk_fmunmap(addr, length);
}
sk_sp<SkData> SkData::MakeFromFILE(FILE* f) {
size_t size;
void* addr = sk_fmmap(f, &size);
if (nullptr == addr) {
return nullptr;
}
return SkData::MakeWithProc(addr, size, sk_mmap_releaseproc, reinterpret_cast<void*>(size));
}
sk_sp<SkData> SkData::MakeFromFileName(const char path[]) {
FILE* f = path ? sk_fopen(path, kRead_SkFILE_Flag) : nullptr;
if (nullptr == f) {
return nullptr;
}
auto data = MakeFromFILE(f);
sk_fclose(f);
return data;
}
sk_sp<SkData> SkData::MakeFromFD(int fd) {
size_t size;
void* addr = sk_fdmmap(fd, &size);
if (nullptr == addr) {
return nullptr;
}
return SkData::MakeWithProc(addr, size, sk_mmap_releaseproc, reinterpret_cast<void*>(size));
}
// assumes context is a SkData
static void sk_dataref_releaseproc(const void*, void* context) {
SkData* src = reinterpret_cast<SkData*>(context);
src->unref();
}
sk_sp<SkData> SkData::MakeSubset(const SkData* src, size_t offset, size_t length) {
/*
We could, if we wanted/need to, just make a deep copy of src's data,
rather than referencing it. This would duplicate the storage (of the
subset amount) but would possibly allow src to go out of scope sooner.
*/
size_t available = src->size();
if (offset >= available || 0 == length) {
return SkData::MakeEmpty();
}
available -= offset;
if (length > available) {
length = available;
}
SkASSERT(length > 0);
src->ref(); // this will be balanced in sk_dataref_releaseproc
return sk_sp<SkData>(new SkData(src->bytes() + offset, length, sk_dataref_releaseproc,
const_cast<SkData*>(src)));
}
sk_sp<SkData> SkData::MakeWithCString(const char cstr[]) {
size_t size;
if (nullptr == cstr) {
cstr = "";
size = 1;
} else {
size = strlen(cstr) + 1;
}
return MakeWithCopy(cstr, size);
}
///////////////////////////////////////////////////////////////////////////////
sk_sp<SkData> SkData::MakeFromStream(SkStream* stream, size_t size) {
sk_sp<SkData> data(SkData::MakeUninitialized(size));
if (stream->read(data->writable_data(), size) != size) {
return nullptr;
}
return data;
}
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