SkValidatingReadBuffer.h revision ef74fa189b738e13295d6a96f86a6e10223505a8 
1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkValidatingReadBuffer_DEFINED
9#define SkValidatingReadBuffer_DEFINED
10
11#include "SkRefCnt.h"
12#include "SkBitmapHeap.h"
13#include "SkFlattenableBuffers.h"
14#include "SkPath.h"
15#include "SkPicture.h"
16#include "SkReader32.h"
17
18class SkBitmap;
19
20class SkValidatingReadBuffer : public SkFlattenableReadBuffer {
21public:
22    SkValidatingReadBuffer(const void* data, size_t size);
23    virtual ~SkValidatingReadBuffer();
24
25    const void* skip(size_t size);
26
27    // primitives
28    virtual bool readBool() SK_OVERRIDE;
29    virtual SkColor readColor() SK_OVERRIDE;
30    virtual SkFixed readFixed() SK_OVERRIDE;
31    virtual int32_t readInt() SK_OVERRIDE;
32    virtual SkScalar readScalar() SK_OVERRIDE;
33    virtual uint32_t readUInt() SK_OVERRIDE;
34    virtual int32_t read32() SK_OVERRIDE;
35
36    // strings -- the caller is responsible for freeing the string contents
37    virtual void readString(SkString* string) SK_OVERRIDE;
38    virtual void* readEncodedString(size_t* length, SkPaint::TextEncoding encoding) SK_OVERRIDE;
39
40    // common data structures
41    virtual SkFlattenable* readFlattenable(SkFlattenable::Type type) SK_OVERRIDE;
42    virtual void readPoint(SkPoint* point) SK_OVERRIDE;
43    virtual void readMatrix(SkMatrix* matrix) SK_OVERRIDE;
44    virtual void readIRect(SkIRect* rect) SK_OVERRIDE;
45    virtual void readRect(SkRect* rect) SK_OVERRIDE;
46    virtual void readRegion(SkRegion* region) SK_OVERRIDE;
47    virtual void readPath(SkPath* path) SK_OVERRIDE;
48
49    // binary data and arrays
50    virtual bool readByteArray(void* value, size_t size) SK_OVERRIDE;
51    virtual bool readColorArray(SkColor* colors, size_t size) SK_OVERRIDE;
52    virtual bool readIntArray(int32_t* values, size_t size) SK_OVERRIDE;
53    virtual bool readPointArray(SkPoint* points, size_t size) SK_OVERRIDE;
54    virtual bool readScalarArray(SkScalar* values, size_t size) SK_OVERRIDE;
55
56    // helpers to get info about arrays and binary data
57    virtual uint32_t getArrayCount() SK_OVERRIDE;
58
59    virtual void readBitmap(SkBitmap* bitmap) SK_OVERRIDE;
60    // TODO: Implement this (securely) when needed
61    virtual SkTypeface* readTypeface() SK_OVERRIDE;
62
63    virtual bool validate(bool isValid) SK_OVERRIDE;
64    virtual bool isValid() const SK_OVERRIDE;
65
66    virtual bool validateAvailable(size_t size) SK_OVERRIDE;
67
68private:
69    bool readArray(void* value, size_t size, size_t elementSize);
70
71    void setMemory(const void* data, size_t size);
72
73    static bool IsPtrAlign4(const void* ptr) {
74        return SkIsAlign4((uintptr_t)ptr);
75    }
76
77    SkReader32 fReader;
78    bool fError;
79
80    typedef SkFlattenableReadBuffer INHERITED;
81};
82
83#endif // SkValidatingReadBuffer_DEFINED
84