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Diffstat (limited to 'media/img_utils/include/img_utils/TiffEntry.h')
-rw-r--r-- | media/img_utils/include/img_utils/TiffEntry.h | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/media/img_utils/include/img_utils/TiffEntry.h b/media/img_utils/include/img_utils/TiffEntry.h new file mode 100644 index 0000000..cd01640 --- /dev/null +++ b/media/img_utils/include/img_utils/TiffEntry.h @@ -0,0 +1,129 @@ +/* + * 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_ENTRY +#define IMG_UTILS_TIFF_ENTRY + +#include <img_utils/TiffWritable.h> +#include <img_utils/TiffHelpers.h> +#include <img_utils/EndianUtils.h> + +#include <cutils/compiler.h> +#include <utils/String8.h> +#include <utils/Errors.h> +#include <stdint.h> + +namespace android { +namespace img_utils { + +#define COMPARE_DEF(op) \ +inline bool operator op (const TiffEntry& entry) const; + +/** + * This class holds a single TIFF IFD entry. + */ +class ANDROID_API TiffEntry : public TiffWritable { + public: + // TODO: Copy constructor/equals here. + virtual ~TiffEntry(); + + /** + * Write the 12-byte IFD entry to the output. The given offset will be + * set as the tag value if the size of the tag value exceeds the max + * size for the TIFF Value field (4 bytes), and should be word aligned. + * + * Returns OK on success, or a negative error code on failure. + */ + virtual status_t writeTagInfo(uint32_t offset, /*out*/EndianOutput* out) const = 0; + + /** + * Get the count set for this entry. This corresponds to the TIFF Count + * field. + */ + virtual uint32_t getCount() const = 0; + + /** + * Get the tag id set for this entry. This corresponds to the TIFF Tag + * field. + */ + virtual uint16_t getTag() const = 0; + + /** + * Get the type set for this entry. This corresponds to the TIFF Type + * field. + */ + virtual TagType getType() const = 0; + + /** + * Get the defined endianness for this entry. If this is defined, + * the tag value will be written with the given byte order. + */ + virtual Endianness getEndianness() const = 0; + + /** + * Get the value for this entry. This corresponds to the TIFF Value + * field. + * + * Returns NULL if the value is NULL, or if the type used does not + * match the type of this tag. + */ + template<typename T> + const T* getData() const; + + String8 toString() const; + + /** + * Force the type used here to be a valid TIFF type. + * + * Returns NULL if the given value is NULL, or if the type given does + * not match the type of the value given. + */ + template<typename T> + static const T* forceValidType(TagType type, const T* value); + + virtual const void* getDataHelper() const = 0; + + COMPARE_DEF(>) + COMPARE_DEF(<) + + protected: + enum { + MAX_PRINT_STRING_LENGTH = 256 + }; +}; + +#define COMPARE(op) \ +bool TiffEntry::operator op (const TiffEntry& entry) const { \ + return getComparableValue() op entry.getComparableValue(); \ +} + +COMPARE(>) +COMPARE(<) + + +template<typename T> +const T* TiffEntry::getData() const { + const T* value = reinterpret_cast<const T*>(getDataHelper()); + return forceValidType<T>(getType(), value); +} + +#undef COMPARE +#undef COMPARE_DEF + +} /*namespace img_utils*/ +} /*namespace android*/ + +#endif /*IMG_UTILS_TIFF_ENTRY*/ |