2 * Copyright 2011 Google Inc.
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
11 #include "SkReadBuffer.h"
12 #include "SkWriteBuffer.h"
14 SkData::SkData(const void* ptr, size_t size, ReleaseProc proc, void* context) {
18 fReleaseProcContext = context;
23 fReleaseProc(fPtr, fSize, fReleaseProcContext);
27 bool SkData::equals(const SkData* other) const {
32 return fSize == other->fSize && !memcmp(fPtr, other->fPtr, fSize);
35 size_t SkData::copyRange(size_t offset, size_t length, void* buffer) const {
36 size_t available = fSize;
37 if (offset >= available || 0 == length) {
41 if (length > available) {
46 memcpy(buffer, this->bytes() + offset, length);
50 ///////////////////////////////////////////////////////////////////////////////
52 SkData* SkData::NewEmptyImpl() {
53 return new SkData(NULL, 0, NULL, NULL);
55 void SkData::DeleteEmpty(SkData* ptr) { SkDELETE(ptr); }
57 SkData* SkData::NewEmpty() {
58 SK_DECLARE_STATIC_LAZY_PTR(SkData, empty, NewEmptyImpl, DeleteEmpty);
59 return SkRef(empty.get());
62 // assumes fPtr was allocated via sk_malloc
63 static void sk_free_releaseproc(const void* ptr, size_t, void*) {
67 SkData* SkData::NewFromMalloc(const void* data, size_t length) {
68 return new SkData(data, length, sk_free_releaseproc, NULL);
71 SkData* SkData::NewWithCopy(const void* data, size_t length) {
73 return SkData::NewEmpty();
76 void* copy = sk_malloc_throw(length); // balanced in sk_free_releaseproc
77 memcpy(copy, data, length);
78 return new SkData(copy, length, sk_free_releaseproc, NULL);
81 SkData* SkData::NewWithProc(const void* data, size_t length,
82 ReleaseProc proc, void* context) {
83 return new SkData(data, length, proc, context);
86 // assumes fPtr was allocated with sk_fmmap
87 static void sk_mmap_releaseproc(const void* addr, size_t length, void*) {
88 sk_fmunmap(addr, length);
91 SkData* SkData::NewFromFILE(SkFILE* f) {
93 void* addr = sk_fmmap(f, &size);
98 return SkData::NewWithProc(addr, size, sk_mmap_releaseproc, NULL);
101 SkData* SkData::NewFromFileName(const char path[]) {
102 SkFILE* f = path ? sk_fopen(path, kRead_SkFILE_Flag) : NULL;
106 SkData* data = NewFromFILE(f);
111 SkData* SkData::NewFromFD(int fd) {
113 void* addr = sk_fdmmap(fd, &size);
118 return SkData::NewWithProc(addr, size, sk_mmap_releaseproc, NULL);
121 // assumes context is a SkData
122 static void sk_dataref_releaseproc(const void*, size_t, void* context) {
123 SkData* src = reinterpret_cast<SkData*>(context);
127 SkData* SkData::NewSubset(const SkData* src, size_t offset, size_t length) {
129 We could, if we wanted/need to, just make a deep copy of src's data,
130 rather than referencing it. This would duplicate the storage (of the
131 subset amount) but would possibly allow src to go out of scope sooner.
134 size_t available = src->size();
135 if (offset >= available || 0 == length) {
136 return SkData::NewEmpty();
139 if (length > available) {
142 SkASSERT(length > 0);
144 src->ref(); // this will be balanced in sk_dataref_releaseproc
145 return new SkData(src->bytes() + offset, length, sk_dataref_releaseproc,
146 const_cast<SkData*>(src));
149 SkData* SkData::NewWithCString(const char cstr[]) {
155 size = strlen(cstr) + 1;
157 return NewWithCopy(cstr, size);