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120 lines
3.1 KiB
C
120 lines
3.1 KiB
C
/* -*- mode: C; c-basic-offset: 4 -*- */
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#ident "Copyright (c) 2007, 2008 Tokutek Inc. All rights reserved."
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/* Purpose of this file is to define and handle the fifo_msg, which
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* is the stored format of a brt_msg.
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*
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* Note, when translating from fifo_msg to brt_msg, the brt_msg
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* will be created with a pointer into the xids in the fifo_msg.
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* (The xids will not be embedded in the brt_msg.) This means
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* that a valid xids struct must be embedded in the fifo_msg.
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*
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* NOTE: fifo_msg is stored in memory and on disk in same format.
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* fifo_msg is stored in same byte order both in-memory
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* and on-disk. Accessors are responsible for tranposition
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* to host order.
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*/
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#include <string.h>
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#include <toku_portability.h>
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#include "brttypes.h"
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#include "xids.h"
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#include "xids-internal.h"
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#include "brt_msg.h"
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#include "fifo_msg.h"
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#include <toku_htod.h>
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// xids_and_key_and_val field is XIDS_S followed by key
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// followed by value.
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struct fifo_msg_t {
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u_int32_t keylen;
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u_int32_t vallen;
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u_int8_t type;
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// u_int8_t pad[7]; // force 64-bit alignment if needed ???
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u_int8_t xids_and_key_and_val[]; // undifferentiated bytes
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};
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u_int32_t
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fifo_msg_get_keylen(FIFO_MSG fifo_msg) {
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u_int32_t rval = fifo_msg->keylen;
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rval = toku_dtoh32(rval);
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return rval;
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}
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u_int32_t
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fifo_msg_get_vallen(FIFO_MSG fifo_msg) {
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u_int32_t rval = fifo_msg->vallen;
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rval = toku_dtoh32(rval);
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return rval;
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}
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XIDS
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fifo_msg_get_xids(FIFO_MSG fifo_msg) {
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XIDS rval = (XIDS) &fifo_msg->xids_and_key_and_val;
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return rval;
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}
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static u_int32_t
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fifo_msg_get_xids_size(FIFO_MSG fifo_msg) {
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u_int32_t rval;
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XIDS xids = fifo_msg_get_xids(fifo_msg);
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rval = xids_get_size(xids);
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return rval;
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}
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void *
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fifo_msg_get_key(FIFO_MSG fifo_msg) {
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void * rval;
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u_int32_t xidslen = fifo_msg_get_xids_size(fifo_msg);
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rval = (u_int8_t*)fifo_msg->xids_and_key_and_val + xidslen;
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return rval;
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}
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void *
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fifo_msg_get_val(FIFO_MSG fifo_msg) {
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void * rval;
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void * key = fifo_msg_get_key(fifo_msg);
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u_int32_t keylen = fifo_msg_get_keylen(fifo_msg);
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rval = (u_int8_t*)key + keylen;
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return rval;
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}
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enum brt_msg_type
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fifo_msg_get_type(FIFO_MSG fifo_msg) {
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enum brt_msg_type rval = (enum brt_msg_type) fifo_msg->type;
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return rval;
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}
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// Finds size of a fifo msg.
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u_int32_t
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fifo_msg_get_size(FIFO_MSG fifo_msg) {
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u_int32_t rval;
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u_int32_t keylen = fifo_msg_get_keylen(fifo_msg);
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u_int32_t vallen = fifo_msg_get_vallen(fifo_msg);
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u_int32_t xidslen = fifo_msg_get_xids_size(fifo_msg);
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rval = keylen + vallen + xidslen + sizeof(*fifo_msg);
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return rval;
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}
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// Return number of bytes required for a fifo_msg created from
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// the given brt_msg
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u_int32_t
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fifo_msg_get_size_required(BRT_MSG brt_msg) {
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u_int32_t rval;
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u_int32_t keylen = brt_msg_get_keylen(brt_msg);
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u_int32_t vallen = brt_msg_get_vallen(brt_msg);
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XIDS xids = brt_msg_get_xids(brt_msg);
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u_int32_t xidslen = xids_get_size(xids);
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rval = keylen + vallen + xidslen + sizeof(struct fifo_msg_t);
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return rval;
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}
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