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/* Copyright 2011 Justin Erenkrantz and Greg Stein
*
* 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 <apr_pools.h>
#include "serf.h"
#include "serf_bucket_util.h"
typedef struct {
struct iovec *vecs;
/* Total number of buffer stored in the vecs var. */
int vecs_len;
/* Points to the first unread buffer. */
int current_vec;
/* First buffer offset. */
int offset;
} iovec_context_t;
serf_bucket_t *serf_bucket_iovec_create(
struct iovec vecs[],
int len,
serf_bucket_alloc_t *allocator)
{
iovec_context_t *ctx;
int i;
ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
ctx->vecs = serf_bucket_mem_alloc(allocator, len * sizeof(struct iovec));
ctx->vecs_len = len;
ctx->current_vec = 0;
ctx->offset = 0;
/* copy all buffers to our iovec. */
for (i = 0; i < len; i++) {
ctx->vecs[i].iov_base = vecs[i].iov_base;
ctx->vecs[i].iov_len = vecs[i].iov_len;
}
return serf_bucket_create(&serf_bucket_type_iovec, allocator, ctx);
}
static apr_status_t serf_iovec_readline(serf_bucket_t *bucket,
int acceptable, int *found,
const char **data, apr_size_t *len)
{
return APR_ENOTIMPL;
}
static apr_status_t serf_iovec_read_iovec(serf_bucket_t *bucket,
apr_size_t requested,
int vecs_size,
struct iovec *vecs,
int *vecs_used)
{
iovec_context_t *ctx = bucket->data;
*vecs_used = 0;
/* copy the requested amount of buffers to the provided iovec. */
for (; ctx->current_vec < ctx->vecs_len; ctx->current_vec++) {
struct iovec vec = ctx->vecs[ctx->current_vec];
apr_size_t remaining;
if (requested != SERF_READ_ALL_AVAIL && requested <= 0)
break;
if (*vecs_used >= vecs_size)
break;
vecs[*vecs_used].iov_base = (char*)vec.iov_base + ctx->offset;
remaining = vec.iov_len - ctx->offset;
/* Less bytes requested than remaining in the current buffer. */
if (requested != SERF_READ_ALL_AVAIL && requested < remaining) {
vecs[*vecs_used].iov_len = requested;
ctx->offset += requested;
requested = 0;
(*vecs_used)++;
break;
} else {
/* Copy the complete buffer. */
vecs[*vecs_used].iov_len = remaining;
ctx->offset = 0;
if (requested != SERF_READ_ALL_AVAIL)
requested -= remaining;
(*vecs_used)++;
}
}
if (ctx->current_vec == ctx->vecs_len && !ctx->offset)
return APR_EOF;
return APR_SUCCESS;
}
static apr_status_t serf_iovec_read(serf_bucket_t *bucket,
apr_size_t requested,
const char **data, apr_size_t *len)
{
struct iovec vec[1];
apr_status_t status;
int vecs_used;
status = serf_iovec_read_iovec(bucket, requested, 1, vec, &vecs_used);
if (vecs_used) {
*data = vec[0].iov_base;
*len = vec[0].iov_len;
} else {
*len = 0;
}
return status;
}
static apr_status_t serf_iovec_peek(serf_bucket_t *bucket,
const char **data,
apr_size_t *len)
{
iovec_context_t *ctx = bucket->data;
if (ctx->current_vec >= ctx->vecs_len) {
*len = 0;
return APR_EOF;
}
/* Return the first unread buffer, don't bother combining all
remaining data. */
*data = ctx->vecs[ctx->current_vec].iov_base;
*len = ctx->vecs[ctx->current_vec].iov_len;
if (ctx->current_vec + 1 == ctx->vecs_len)
return APR_EOF;
return APR_SUCCESS;
}
static void serf_iovec_destroy(serf_bucket_t *bucket)
{
iovec_context_t *ctx = bucket->data;
serf_bucket_mem_free(bucket->allocator, ctx->vecs);
serf_default_destroy_and_data(bucket);
}
const serf_bucket_type_t serf_bucket_type_iovec = {
"IOVEC",
serf_iovec_read,
serf_iovec_readline,
serf_iovec_read_iovec,
serf_default_read_for_sendfile,
serf_default_read_bucket,
serf_iovec_peek,
serf_iovec_destroy,
};
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