TiffEntryImpl.h revision e507721000647a7d8afe44c63ef7fd04ef8971b1 
1/*
2 * Copyright 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef IMG_UTILS_TIFF_ENTRY_IMPL
18#define IMG_UTILS_TIFF_ENTRY_IMPL
19
20#include <img_utils/TiffEntry.h>
21#include <img_utils/TiffHelpers.h>
22#include <img_utils/Output.h>
23#include <img_utils/EndianUtils.h>
24
25#include <utils/Log.h>
26#include <utils/Errors.h>
27#include <stdint.h>
28
29namespace android {
30namespace img_utils {
31
32template<typename T>
33class TiffEntryImpl : public TiffEntry {
34    public:
35        // TODO: Copy constructor/equals here.
36        TiffEntryImpl(uint16_t tag, TagType type, uint32_t count, Endianness end, const T* data);
37        virtual ~TiffEntryImpl();
38
39        status_t writeData(uint32_t offset, /*out*/EndianOutput* out) const;
40        status_t writeTagInfo(uint32_t offset, /*out*/EndianOutput* out) const;
41
42        uint32_t getCount() const;
43        uint16_t getTag() const;
44        TagType getType() const;
45        Endianness getEndianness() const;
46        uint32_t getSize() const;
47        uint32_t getComparableValue() const;
48
49    protected:
50        const void* getDataHelper() const;
51        uint32_t getActualSize() const;
52
53        uint16_t mTag;
54        uint16_t mType;
55        uint32_t mCount;
56        Endianness mEnd;
57        T* mData;
58
59};
60
61template<typename T>
62TiffEntryImpl<T>::TiffEntryImpl(uint16_t tag, TagType type, uint32_t count, Endianness end,
63        const T* data)
64        : mTag(tag), mType(static_cast<uint16_t>(type)), mCount(count), mEnd(end) {
65    count = (type == RATIONAL || type == SRATIONAL) ? count * 2 : count;
66    mData = new T[count]();
67    for (uint32_t i = 0; i < count; ++i) {
68        mData[i] = data[i];
69    }
70}
71
72template<typename T>
73TiffEntryImpl<T>::~TiffEntryImpl() {
74    if (mData) {
75        delete[] mData;
76    }
77}
78
79template<typename T>
80uint32_t TiffEntryImpl<T>::getCount() const {
81    return mCount;
82}
83
84template<typename T>
85uint16_t TiffEntryImpl<T>::getTag() const {
86    return mTag;
87}
88
89template<typename T>
90TagType TiffEntryImpl<T>::getType() const {
91    return static_cast<TagType>(mType);
92}
93
94template<typename T>
95const void* TiffEntryImpl<T>::getDataHelper() const {
96    return reinterpret_cast<const void*>(mData);
97}
98
99template<typename T>
100uint32_t TiffEntryImpl<T>::getSize() const {
101    uint32_t total = getActualSize();
102    WORD_ALIGN(total)
103    return (total <= OFFSET_SIZE) ? 0 : total;
104}
105
106template<typename T>
107uint32_t TiffEntryImpl<T>::getActualSize() const {
108    uint32_t total = sizeof(T) * mCount;
109    if (getType() == RATIONAL || getType() == SRATIONAL) {
110        // 2 ints stored for each rational, multiply by 2
111        total <<= 1;
112    }
113    return total;
114}
115
116template<typename T>
117Endianness TiffEntryImpl<T>::getEndianness() const {
118    return mEnd;
119}
120
121template<typename T>
122uint32_t TiffEntryImpl<T>::getComparableValue() const {
123    return mTag;
124}
125
126template<typename T>
127status_t TiffEntryImpl<T>::writeTagInfo(uint32_t offset, /*out*/EndianOutput* out) const {
128    assert((offset % TIFF_WORD_SIZE) == 0);
129    status_t ret = OK;
130    BAIL_ON_FAIL(out->write(&mTag, 0, 1), ret);
131    BAIL_ON_FAIL(out->write(&mType, 0, 1), ret);
132    BAIL_ON_FAIL(out->write(&mCount, 0, 1), ret);
133
134    uint32_t dataSize = getActualSize();
135    if (dataSize > OFFSET_SIZE) {
136        BAIL_ON_FAIL(out->write(&offset, 0, 1), ret);
137    } else {
138        uint32_t count = mCount;
139        if (getType() == RATIONAL || getType() == SRATIONAL) {
140            /**
141             * Rationals are stored as an array of ints.  Each
142             * rational is represented by 2 ints.  To recover the
143             * size of the array here, multiply the count by 2.
144             */
145            count <<= 1;
146        }
147        BAIL_ON_FAIL(out->write(mData, 0, count), ret);
148        ZERO_TILL_WORD(out, dataSize, ret);
149    }
150    return ret;
151}
152
153template<typename T>
154status_t TiffEntryImpl<T>::writeData(uint32_t offset, EndianOutput* out) const {
155    status_t ret = OK;
156
157    // Some tags have fixed-endian value output
158    Endianness tmp = UNDEFINED_ENDIAN;
159    if (mEnd != UNDEFINED_ENDIAN) {
160        tmp = out->getEndianness();
161        out->setEndianness(mEnd);
162    }
163
164    uint32_t count = mCount;
165    if (getType() == RATIONAL || getType() == SRATIONAL) {
166        /**
167         * Rationals are stored as an array of ints.  Each
168         * rational is represented by 2 ints.  To recover the
169         * size of the array here, multiply the count by 2.
170         */
171        count <<= 1;
172    }
173
174    BAIL_ON_FAIL(out->write(mData, 0, count), ret);
175
176    if (mEnd != UNDEFINED_ENDIAN) {
177        out->setEndianness(tmp);
178    }
179
180    // Write to next word alignment
181    ZERO_TILL_WORD(out, sizeof(T) * count, ret);
182    return ret;
183}
184
185} /*namespace img_utils*/
186} /*namespace android*/
187
188#endif /*IMG_UTILS_TIFF_ENTRY_IMPL*/
189
190
191