diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/core/SkData.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/core/SkData.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,148 @@
+
+/*
+ * Copyright 2011 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+
+#ifndef SkData_DEFINED
+#define SkData_DEFINED
+
+#include "SkRefCnt.h"
+
+struct SkFILE;
+
+/**
+ *  SkData holds an immutable data buffer. Not only is the data immutable,
+ *  but the actual ptr that is returned (by data() or bytes()) is guaranteed
+ *  to always be the same for the life of this instance.
+ */
+class SK_API SkData : public SkRefCnt {
+public:
+    SK_DECLARE_INST_COUNT(SkData)
+
+    /**
+     *  Returns the number of bytes stored.
+     */
+    size_t size() const { return fSize; }
+
+    bool isEmpty() const { return 0 == fSize; }
+
+    /**
+     *  Returns the ptr to the data.
+     */
+    const void* data() const { return fPtr; }
+
+    /**
+     *  Like data(), returns a read-only ptr into the data, but in this case
+     *  it is cast to uint8_t*, to make it easy to add an offset to it.
+     */
+    const uint8_t* bytes() const {
+        return reinterpret_cast<const uint8_t*>(fPtr);
+    }
+
+    /**
+     *  Helper to copy a range of the data into a caller-provided buffer.
+     *  Returns the actual number of bytes copied, after clamping offset and
+     *  length to the size of the data. If buffer is NULL, it is ignored, and
+     *  only the computed number of bytes is returned.
+     */
+    size_t copyRange(size_t offset, size_t length, void* buffer) const;
+
+    /**
+     *  Returns true if these two objects have the same length and contents,
+     *  effectively returning 0 == memcmp(...)
+     */
+    bool equals(const SkData* other) const;
+
+    /**
+     *  Function that, if provided, will be called when the SkData goes out
+     *  of scope, allowing for custom allocation/freeing of the data.
+     */
+    typedef void (*ReleaseProc)(const void* ptr, size_t length, void* context);
+
+    /**
+     *  Create a new dataref by copying the specified data
+     */
+    static SkData* NewWithCopy(const void* data, size_t length);
+
+    /**
+     *  Create a new dataref by copying the specified c-string
+     *  (a null-terminated array of bytes). The returned SkData will have size()
+     *  equal to strlen(cstr) + 1. If cstr is NULL, it will be treated the same
+     *  as "".
+     */
+    static SkData* NewWithCString(const char cstr[]);
+
+    /**
+     *  Create a new dataref, taking the data ptr as is, and using the
+     *  releaseproc to free it. The proc may be NULL.
+     */
+    static SkData* NewWithProc(const void* data, size_t length,
+                               ReleaseProc proc, void* context);
+
+    /**
+     *  Create a new dataref from a pointer allocated by malloc. The Data object
+     *  takes ownership of that allocation, and will handling calling sk_free.
+     */
+    static SkData* NewFromMalloc(const void* data, size_t length);
+
+    /**
+     *  Create a new dataref the file with the specified path.
+     *  If the file cannot be opened, this returns NULL.
+     */
+    static SkData* NewFromFileName(const char path[]);
+
+    /**
+     *  Create a new dataref from a SkFILE.
+     *  This does not take ownership of the SkFILE, nor close it.
+     *  The caller is free to close the SkFILE at its convenience.
+     *  The SkFILE must be open for reading only.
+     *  Returns NULL on failure.
+     */
+    static SkData* NewFromFILE(SkFILE* f);
+
+    /**
+     *  Create a new dataref from a file descriptor.
+     *  This does not take ownership of the file descriptor, nor close it.
+     *  The caller is free to close the file descriptor at its convenience.
+     *  The file descriptor must be open for reading only.
+     *  Returns NULL on failure.
+     */
+    static SkData* NewFromFD(int fd);
+
+    /**
+     *  Create a new dataref using a subset of the data in the specified
+     *  src dataref.
+     */
+    static SkData* NewSubset(const SkData* src, size_t offset, size_t length);
+
+    /**
+     *  Returns a new empty dataref (or a reference to a shared empty dataref).
+     *  New or shared, the caller must see that unref() is eventually called.
+     */
+    static SkData* NewEmpty();
+
+private:
+    ReleaseProc fReleaseProc;
+    void*       fReleaseProcContext;
+
+    const void* fPtr;
+    size_t      fSize;
+
+    SkData(const void* ptr, size_t size, ReleaseProc, void* context);
+    virtual ~SkData();
+
+    // Called the first time someone calls NewEmpty to initialize the singleton.
+    static void NewEmptyImpl(int/*unused*/);
+
+    typedef SkRefCnt INHERITED;
+};
+
+/** Typedef of SkAutoTUnref<SkData> for automatically unref-ing a SkData. */
+typedef SkAutoTUnref<SkData> SkAutoDataUnref;
+
+#endif