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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 "SkReadBuffer.h"
#include "SkWriteBuffer.h"
#include "SkOSFile.h"
#include "SkOnce.h"
SkData::SkData(const void* ptr, size_t size, ReleaseProc proc, void* context) {
fPtr = ptr;
fSize = size;
fReleaseProc = proc;
fReleaseProcContext = context;
}
SkData::~SkData() {
if (fReleaseProc) {
fReleaseProc(fPtr, fSize, fReleaseProcContext);
}
}
bool SkData::equals(const SkData* other) const {
if (NULL == 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;
}
///////////////////////////////////////////////////////////////////////////////
static SkData* gEmptyDataRef = NULL;
static void cleanup_gEmptyDataRef() { gEmptyDataRef->unref(); }
void SkData::NewEmptyImpl(int) {
gEmptyDataRef = new SkData(NULL, 0, NULL, NULL);
}
SkData* SkData::NewEmpty() {
SK_DECLARE_STATIC_ONCE(once);
SkOnce(&once, SkData::NewEmptyImpl, 0, cleanup_gEmptyDataRef);
gEmptyDataRef->ref();
return gEmptyDataRef;
}
// assumes fPtr was allocated via sk_malloc
static void sk_free_releaseproc(const void* ptr, size_t, void*) {
sk_free((void*)ptr);
}
SkData* SkData::NewFromMalloc(const void* data, size_t length) {
return new SkData(data, length, sk_free_releaseproc, NULL);
}
SkData* SkData::NewWithCopy(const void* data, size_t length) {
if (0 == length) {
return SkData::NewEmpty();
}
void* copy = sk_malloc_throw(length); // balanced in sk_free_releaseproc
memcpy(copy, data, length);
return new SkData(copy, length, sk_free_releaseproc, NULL);
}
SkData* SkData::NewWithProc(const void* data, size_t length,
ReleaseProc proc, void* context) {
return new SkData(data, length, proc, context);
}
// assumes fPtr was allocated with sk_fmmap
static void sk_mmap_releaseproc(const void* addr, size_t length, void*) {
sk_fmunmap(addr, length);
}
SkData* SkData::NewFromFILE(SkFILE* f) {
size_t size;
void* addr = sk_fmmap(f, &size);
if (NULL == addr) {
return NULL;
}
return SkData::NewWithProc(addr, size, sk_mmap_releaseproc, NULL);
}
SkData* SkData::NewFromFileName(const char path[]) {
SkFILE* f = path ? sk_fopen(path, kRead_SkFILE_Flag) : NULL;
if (NULL == f) {
return NULL;
}
SkData* data = NewFromFILE(f);
sk_fclose(f);
return data;
}
SkData* SkData::NewFromFD(int fd) {
size_t size;
void* addr = sk_fdmmap(fd, &size);
if (NULL == addr) {
return NULL;
}
return SkData::NewWithProc(addr, size, sk_mmap_releaseproc, NULL);
}
// assumes context is a SkData
static void sk_dataref_releaseproc(const void*, size_t, void* context) {
SkData* src = reinterpret_cast<SkData*>(context);
src->unref();
}
SkData* SkData::NewSubset(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::NewEmpty();
}
available -= offset;
if (length > available) {
length = available;
}
SkASSERT(length > 0);
src->ref(); // this will be balanced in sk_dataref_releaseproc
return new SkData(src->bytes() + offset, length, sk_dataref_releaseproc,
const_cast<SkData*>(src));
}
SkData* SkData::NewWithCString(const char cstr[]) {
size_t size;
if (NULL == cstr) {
cstr = "";
size = 1;
} else {
size = strlen(cstr) + 1;
}
return NewWithCopy(cstr, size);
}
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