SkValidatingReadBuffer.h revision 36352bf5e38f45a70ee4f4fc132a38048d38206d 
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 "SkReadBuffer.h"
14#include "SkWriteBuffer.h"
15#include "SkPath.h"
16#include "SkPicture.h"
17#include "SkReader32.h"
18
19class SkBitmap;
20
21class SkValidatingReadBuffer : public SkReadBuffer {
22public:
23    SkValidatingReadBuffer(const void* data, size_t size);
24    virtual ~SkValidatingReadBuffer();
25
26    const void* skip(size_t size) override;
27
28    // primitives
29    bool readBool() override;
30    SkColor readColor() override;
31    SkFixed readFixed() override;
32    int32_t readInt() override;
33    SkScalar readScalar() override;
34    uint32_t readUInt() override;
35    int32_t read32() override;
36
37    // strings -- the caller is responsible for freeing the string contents
38    void readString(SkString* string) override;
39    void* readEncodedString(size_t* length, SkPaint::TextEncoding encoding) override;
40
41    // common data structures
42    SkFlattenable* readFlattenable(SkFlattenable::Type type) override;
43    void skipFlattenable() override;
44    void readPoint(SkPoint* point) override;
45    void readMatrix(SkMatrix* matrix) override;
46    void readIRect(SkIRect* rect) override;
47    void readRect(SkRect* rect) override;
48    void readRegion(SkRegion* region) override;
49    void readPath(SkPath* path) override;
50
51    // binary data and arrays
52    bool readByteArray(void* value, size_t size) override;
53    bool readColorArray(SkColor* colors, size_t size) override;
54    bool readIntArray(int32_t* values, size_t size) override;
55    bool readPointArray(SkPoint* points, size_t size) override;
56    bool readScalarArray(SkScalar* values, size_t size) override;
57
58    // helpers to get info about arrays and binary data
59    uint32_t getArrayCount() override;
60
61    // TODO: Implement this (securely) when needed
62    SkTypeface* readTypeface() override;
63
64    bool validate(bool isValid) override;
65    bool isValid() const override;
66
67    bool validateAvailable(size_t size) override;
68
69private:
70    bool readArray(void* value, size_t size, size_t elementSize);
71
72    void setMemory(const void* data, size_t size);
73
74    static bool IsPtrAlign4(const void* ptr) {
75        return SkIsAlign4((uintptr_t)ptr);
76    }
77
78    bool fError;
79
80    typedef SkReadBuffer INHERITED;
81};
82
83#endif // SkValidatingReadBuffer_DEFINED
84