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lib: add 3-byte stream functions

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Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
This commit is contained in:
David Lamparter 2016-07-28 17:23:47 +02:00 committed by Donald Sharp
parent a8fd820281
commit d6f4a61dde
2 changed files with 81 additions and 0 deletions
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77
lib/stream.c
View File

@ -373,6 +373,47 @@ stream_getw_from (struct stream *s, size_t from)
return w;
}
/* Get next 3-byte from the stream. */
u_int32_t
stream_get3_from (struct stream *s, size_t from)
{
u_int32_t l;
STREAM_VERIFY_SANE(s);
if (!GETP_VALID (s, from + 3))
{
STREAM_BOUND_WARN (s, "get 3byte");
return 0;
}
l = s->data[from++] << 16;
l |= s->data[from++] << 8;
l |= s->data[from];
return l;
}
u_int32_t
stream_get3 (struct stream *s)
{
u_int32_t l;
STREAM_VERIFY_SANE(s);
if (STREAM_READABLE (s) < 3)
{
STREAM_BOUND_WARN (s, "get 3byte");
return 0;
}
l = s->data[s->getp++] << 16;
l |= s->data[s->getp++] << 8;
l |= s->data[s->getp++];
return l;
}
/* Get next long word from the stream. */
u_int32_t
stream_getl_from (struct stream *s, size_t from)
@ -566,6 +607,25 @@ stream_putw (struct stream *s, u_int16_t w)
return 2;
}
/* Put long word to the stream. */
int
stream_put3 (struct stream *s, u_int32_t l)
{
STREAM_VERIFY_SANE (s);
if (STREAM_WRITEABLE (s) < 3)
{
STREAM_BOUND_WARN (s, "put");
return 0;
}
s->data[s->endp++] = (u_char)(l >> 16);
s->data[s->endp++] = (u_char)(l >> 8);
s->data[s->endp++] = (u_char)l;
return 3;
}
/* Put long word to the stream. */
int
stream_putl (struct stream *s, u_int32_t l)
@ -643,6 +703,23 @@ stream_putw_at (struct stream *s, size_t putp, u_int16_t w)
return 2;
}
int
stream_put3_at (struct stream *s, size_t putp, u_int32_t l)
{
STREAM_VERIFY_SANE(s);
if (!PUT_AT_VALID (s, putp + 3))
{
STREAM_BOUND_WARN (s, "put");
return 0;
}
s->data[putp] = (u_char)(l >> 16);
s->data[putp + 1] = (u_char)(l >> 8);
s->data[putp + 2] = (u_char)l;
return 3;
}
int
stream_putl_at (struct stream *s, size_t putp, u_int32_t l)
{

4
lib/stream.h
View File

@ -167,6 +167,8 @@ extern int stream_putc (struct stream *, u_char);
extern int stream_putc_at (struct stream *, size_t, u_char);
extern int stream_putw (struct stream *, u_int16_t);
extern int stream_putw_at (struct stream *, size_t, u_int16_t);
extern int stream_put3 (struct stream *, u_int32_t);
extern int stream_put3_at (struct stream *, size_t, u_int32_t);
extern int stream_putl (struct stream *, u_int32_t);
extern int stream_putl_at (struct stream *, size_t, u_int32_t);
extern int stream_putq (struct stream *, uint64_t);
@ -186,6 +188,8 @@ extern u_char stream_getc (struct stream *);
extern u_char stream_getc_from (struct stream *, size_t);
extern u_int16_t stream_getw (struct stream *);
extern u_int16_t stream_getw_from (struct stream *, size_t);
extern u_int32_t stream_get3 (struct stream *);
extern u_int32_t stream_get3_from (struct stream *, size_t);
extern u_int32_t stream_getl (struct stream *);
extern u_int32_t stream_getl_from (struct stream *, size_t);
extern uint64_t stream_getq (struct stream *);