2d5440be0f
Add a new wsutil header with macros that compute the amount of padding needed to round up to a 4-byte boundary (without any conditional tests) - it ends up being a negate and an AND. Use that in pcapng code. (Next step: use it everywhere else.) Have an inline function that takes a number of bytes of padding to write, between 0 and 3, and writes out that many bytes worth of zeroes. Use it.
23 lines
593 B
C
23 lines
593 B
C
/** @file
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef __WS_PADDING_TO_H__
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#define __WS_PADDING_TO_H__
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/*
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* Amount needed to pad to various powers of 2.
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*/
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#define WS_PADDING_TO_2(n) ((2U - ((n) % 2U)) % 2U)
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#define WS_PADDING_TO_4(n) ((4U - ((n) % 4U)) % 4U)
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#define WS_PADDING_TO_8(n) ((8U - ((n) % 8U)) % 8U)
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#define WS_PADDING_TO_16(n) ((16U - ((n) % 16U)) % 16U)
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#define WS_PADDING_TO_32(n) ((32U - ((n) % 32U)) % 32U)
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#endif /* __WS_PADDING_TO_H__ */
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