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README.dissector: Add a note about integer promotion. 

Change-Id: Ie3b6dfcea7b1cee3b0bda3d9ec2cc9a6857578fc
Reviewed-on: https://code.wireshark.org/review/35308
Reviewed-by: Gerald Combs <gerald@wireshark.org>
This commit is contained in:
Gerald Combs 2019-12-03 16:51:29 -08:00
parent 9879850cc3
commit f2c2b9687d
1 changed files with 7 additions and 0 deletions
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@ -329,6 +329,13 @@ gint64 tvb_get_letohi56(tvbuff_t *tvb, const gint offset);
guint64 tvb_get_letoh64(tvbuff_t *tvb, const gint offset);
gint64 tvb_get_letohi64(tvbuff_t *tvb, const gint offset);
NOTE: Although each of the integer accessors above return types with
specific sizes, the returned values are subject to C's integer promotion
rules. It's often safer and more useful to use int or guint for 32-bit
and smaller types, and gint64 or guint64 for 40-bit and larger types.
Just because a value occupied 16 bits on the wire or over the air
doesn't mean it will within Wireshark.
Single-precision and double-precision IEEE floating-point numbers:
gfloat tvb_get_letohieee_float(tvbuff_t *tvb, const gint offset);