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/*
* MessagePack for C zero-copy buffer implementation
*
* Copyright (C) 2008-2009 FURUHASHI Sadayuki
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "msgpack/vrefbuffer.h"
#include <stdlib.h>
#include <string.h>
bool msgpack_vrefbuffer_init(msgpack_vrefbuffer* vbuf,
size_t ref_size, size_t chunk_size)
{
if(chunk_size < sizeof(msgpack_vrefbuffer_chunk)+72) {
chunk_size = 72;
} else {
chunk_size -= sizeof(msgpack_vrefbuffer_chunk);
}
vbuf->chunk_size = chunk_size;
vbuf->ref_size = ref_size;
// glibcは72バイト以下のmallocが高速
size_t nfirst = (sizeof(struct iovec) < 72/2) ?
72 / sizeof(struct iovec) : 8;
struct iovec* array = (struct iovec*)malloc(
sizeof(struct iovec) * nfirst);
if(array == NULL) {
return false;
}
vbuf->tail = array;
vbuf->end = array + nfirst;
vbuf->array = array;
vbuf->chunk = (msgpack_vrefbuffer_chunk*)malloc(
chunk_size + sizeof(msgpack_vrefbuffer_chunk));
if(vbuf->chunk == NULL) {
free(array);
return false;
}
vbuf->chunk->next = NULL;
vbuf->chunk->free = chunk_size;
return true;
}
void msgpack_vrefbuffer_destroy(msgpack_vrefbuffer* vbuf)
{
msgpack_vrefbuffer_chunk* c = vbuf->chunk;
while(true) {
msgpack_vrefbuffer_chunk* n = c->next;
free(c);
if(n) {
c = n;
} else {
break;
}
}
free(vbuf->array);
}
int msgpack_vrefbuffer_append_ref(msgpack_vrefbuffer* vbuf,
const char* buf, unsigned int len)
{
if(vbuf->tail == vbuf->end) {
const size_t nused = vbuf->end - vbuf->array;
const size_t nnext = nused * 2;
struct iovec* nvec = (struct iovec*)realloc(
vbuf->array, sizeof(struct iovec)*nnext);
if(nvec == NULL) {
return -1;
}
vbuf->array = nvec;
vbuf->end = nvec + nnext;
vbuf->tail = nvec + nused;
}
vbuf->tail->iov_base = (char*)buf;
vbuf->tail->iov_len = len;
++vbuf->tail;
return 0;
}
int msgpack_vrefbuffer_append_copy(msgpack_vrefbuffer* vbuf,
const char* buf, unsigned int len)
{
msgpack_vrefbuffer_chunk* chunk = vbuf->chunk;
size_t cur_size = vbuf->chunk_size;
if(chunk->free < len) {
cur_size = (cur_size > len) ? cur_size : len;
chunk = (msgpack_vrefbuffer_chunk*)malloc(
cur_size + sizeof(msgpack_vrefbuffer_chunk));
if(chunk == NULL) {
return -1;
}
chunk->free = cur_size;
chunk->next = vbuf->chunk;
vbuf->chunk = chunk;
}
char* m = ((char*)chunk) + sizeof(msgpack_vrefbuffer_chunk)
+ (cur_size - chunk->free);
memcpy(m, buf, len);
chunk->free -= len;
if(vbuf->tail != vbuf->array && m ==
(const char*)((vbuf->tail-1)->iov_base) + (vbuf->tail-1)->iov_len) {
(vbuf->tail-1)->iov_len += len;
return 0;
} else {
return msgpack_vrefbuffer_append_ref(vbuf, m, len);
}
}
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