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/*
* PgBouncer - Lightweight connection pooler for PostgreSQL.
*
* Copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Safe and easy access to fixed memory buffer.
*/
/*
* FIXME: the code should be converted so that
* the fatal()-s can be replaced by Asserts().
*/
typedef struct MBuf MBuf;
struct MBuf {
const uint8_t *data;
const uint8_t *end;
const uint8_t *pos;
};
static inline void mbuf_init(MBuf *buf, const uint8_t *ptr, int len)
{
if (len < 0)
fatal("fuckup");
buf->data = buf->pos = ptr;
buf->end = ptr + len;
}
static inline uint8_t mbuf_get_char(MBuf *buf)
{
if (buf->pos + 1 > buf->end)
fatal("buffer overflow");
return *buf->pos++;
}
static inline unsigned mbuf_get_uint16(MBuf *buf)
{
unsigned val;
if (buf->pos + 2 > buf->end)
fatal("buffer overflow");
val = *buf->pos++;
val = (val << 8) | *buf->pos++;
return val;
}
static inline uint32_t mbuf_get_uint32(MBuf *buf)
{
uint32_t val;
if (buf->pos + 4 > buf->end)
fatal("buffer overflow");
val = *buf->pos++;
val = (val << 8) | *buf->pos++;
val = (val << 8) | *buf->pos++;
val = (val << 8) | *buf->pos++;
return val;
}
static inline uint64_t mbuf_get_uint64(MBuf *buf)
{
uint64_t i1, i2;
i1 = mbuf_get_uint32(buf);
i2 = mbuf_get_uint32(buf);
return (i1 << 32) | i2;
}
static inline const uint8_t * mbuf_get_bytes(MBuf *buf, unsigned len)
{
const uint8_t *res = buf->pos;
if (buf->pos + len > buf->end)
fatal("buffer overflow");
buf->pos += len;
return res;
}
static inline unsigned mbuf_avail(const MBuf *buf)
{
return buf->end - buf->pos;
}
static inline unsigned mbuf_size(const MBuf *buf)
{
return buf->end - buf->data;
}
static inline const char * mbuf_get_string(MBuf *buf)
{
const char *res = (const char *)buf->pos;
const uint8_t *nul = memchr(res, 0, mbuf_avail(buf));
if (!nul)
return NULL;
buf->pos = nul + 1;
return res;
}
static inline void mbuf_copy(const MBuf *src, MBuf *dst)
{
*dst = *src;
}
static inline void mbuf_slice(MBuf *src, unsigned len, MBuf *dst)
{
if (len > mbuf_avail(src))
fatal("buffer overflow");
mbuf_init(dst, src->pos, len);
src->pos += len;
}
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