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/*
* Copyright 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef IMG_UTILS_TIFF_HELPERS_H
#define IMG_UTILS_TIFF_HELPERS_H
#include <stdint.h>
namespace android {
namespace img_utils {
const uint8_t ZERO_WORD[] = {0, 0, 0, 0};
#define BAIL_ON_FAIL(x, flag) \
if ((flag = (x)) != OK) return flag;
#define BYTES_TILL_WORD(index) \
((TIFF_WORD_SIZE - ((index) % TIFF_WORD_SIZE)) % TIFF_WORD_SIZE)
#define WORD_ALIGN(count) \
count += BYTES_TILL_WORD(count);
#define ZERO_TILL_WORD(output, index, ret) \
{ \
size_t remaining = BYTES_TILL_WORD(index); \
if (remaining > 0) { \
BAIL_ON_FAIL((output)->write(ZERO_WORD, 0, remaining), ret); \
} \
}
/**
* Basic TIFF header constants.
*/
enum {
BAD_OFFSET = 0,
TIFF_WORD_SIZE = 4, // Size in bytes
IFD_HEADER_SIZE = 2, // Size in bytes
IFD_FOOTER_SIZE = 4, // Size in bytes
TIFF_ENTRY_SIZE = 12, // Size in bytes
MAX_IFD_ENTRIES = UINT16_MAX,
FILE_HEADER_SIZE = 8, // Size in bytes
ENDIAN_MARKER_SIZE = 2, // Size in bytes
TIFF_MARKER_SIZE = 2, // Size in bytes
OFFSET_MARKER_SIZE = 4, // Size in bytes
TIFF_FILE_MARKER = 42,
BIG_ENDIAN_MARKER = 0x4D4Du,
LITTLE_ENDIAN_MARKER = 0x4949u
};
/**
* Constants for the TIFF tag types.
*/
enum TagType {
UNKNOWN_TAGTYPE = 0,
BYTE=1,
ASCII,
SHORT,
LONG,
RATIONAL,
SBYTE,
UNDEFINED,
SSHORT,
SLONG,
SRATIONAL,
FLOAT,
DOUBLE
};
/**
* Sizes of the TIFF entry fields (in bytes).
*/
enum {
TAG_SIZE = 2,
TYPE_SIZE = 2,
COUNT_SIZE = 4,
OFFSET_SIZE = 4
};
/**
* Convenience IFD id constants.
*/
enum {
IFD_0 = 0,
RAW_IFD,
PROFILE_IFD,
PREVIEW_IFD
};
inline size_t getTypeSize(TagType type) {
switch(type) {
case UNDEFINED:
case ASCII:
case BYTE:
case SBYTE:
return 1;
case SHORT:
case SSHORT:
return 2;
case LONG:
case SLONG:
case FLOAT:
return 4;
case RATIONAL:
case SRATIONAL:
case DOUBLE:
return 8;
default:
return 0;
}
}
inline uint32_t calculateIfdSize(size_t numberOfEntries) {
return IFD_HEADER_SIZE + IFD_FOOTER_SIZE + TIFF_ENTRY_SIZE * numberOfEntries;
}
} /*namespace img_utils*/
} /*namespace android*/
#endif /*IMG_UTILS_TIFF_HELPERS_H*/
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