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29 lines
1.1 KiB
C
29 lines
1.1 KiB
C
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_IMAGELIB_ENDIAN_H_
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#define MOZILLA_IMAGELIB_ENDIAN_H_
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#if defined WORDS_BIGENDIAN || defined IS_BIG_ENDIAN
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// We must ensure that the entity is unsigned
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// otherwise, if it is signed/negative, the MSB will be
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// propagated when we shift
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#define LITTLE_TO_NATIVE16(x) (((((uint16_t) x) & 0xFF) << 8) | \
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(((uint16_t) x) >> 8))
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#define LITTLE_TO_NATIVE32(x) (((((uint32_t) x) & 0xFF) << 24) | \
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(((((uint32_t) x) >> 8) & 0xFF) << 16) | \
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(((((uint32_t) x) >> 16) & 0xFF) << 8) | \
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(((uint32_t) x) >> 24))
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#define NATIVE32_TO_LITTLE LITTLE_TO_NATIVE32
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#define NATIVE16_TO_LITTLE LITTLE_TO_NATIVE16
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#else
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#define LITTLE_TO_NATIVE16(x) x
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#define LITTLE_TO_NATIVE32(x) x
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#define NATIVE32_TO_LITTLE(x) x
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#define NATIVE16_TO_LITTLE(x) x
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#endif
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#endif
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