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/* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*/
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#include <apr_pools.h>
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#include "serf.h"
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#include "serf_bucket_util.h"
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typedef struct {
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struct iovec *vecs;
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/* Total number of buffer stored in the vecs var. */
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int vecs_len;
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/* Points to the first unread buffer. */
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int current_vec;
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/* First buffer offset. */
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int offset;
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} iovec_context_t;
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serf_bucket_t *serf_bucket_iovec_create(
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struct iovec vecs[],
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int len,
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serf_bucket_alloc_t *allocator)
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{
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iovec_context_t *ctx;
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int i;
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ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
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ctx->vecs = serf_bucket_mem_alloc(allocator, len * sizeof(struct iovec));
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ctx->vecs_len = len;
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ctx->current_vec = 0;
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ctx->offset = 0;
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/* copy all buffers to our iovec. */
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for (i = 0; i < len; i++) {
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ctx->vecs[i].iov_base = vecs[i].iov_base;
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ctx->vecs[i].iov_len = vecs[i].iov_len;
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}
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return serf_bucket_create(&serf_bucket_type_iovec, allocator, ctx);
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}
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static apr_status_t serf_iovec_readline(serf_bucket_t *bucket,
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int acceptable, int *found,
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const char **data, apr_size_t *len)
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{
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return APR_ENOTIMPL;
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}
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static apr_status_t serf_iovec_read_iovec(serf_bucket_t *bucket,
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apr_size_t requested,
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int vecs_size,
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struct iovec *vecs,
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int *vecs_used)
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{
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iovec_context_t *ctx = bucket->data;
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*vecs_used = 0;
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/* copy the requested amount of buffers to the provided iovec. */
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for (; ctx->current_vec < ctx->vecs_len; ctx->current_vec++) {
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struct iovec vec = ctx->vecs[ctx->current_vec];
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apr_size_t remaining;
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if (requested != SERF_READ_ALL_AVAIL && requested <= 0)
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break;
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if (*vecs_used >= vecs_size)
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break;
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vecs[*vecs_used].iov_base = (char*)vec.iov_base + ctx->offset;
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remaining = vec.iov_len - ctx->offset;
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/* Less bytes requested than remaining in the current buffer. */
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if (requested != SERF_READ_ALL_AVAIL && requested < remaining) {
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vecs[*vecs_used].iov_len = requested;
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ctx->offset += requested;
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requested = 0;
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(*vecs_used)++;
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break;
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} else {
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/* Copy the complete buffer. */
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vecs[*vecs_used].iov_len = remaining;
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ctx->offset = 0;
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if (requested != SERF_READ_ALL_AVAIL)
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requested -= remaining;
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(*vecs_used)++;
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}
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}
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if (ctx->current_vec == ctx->vecs_len && !ctx->offset)
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return APR_EOF;
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return APR_SUCCESS;
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}
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static apr_status_t serf_iovec_read(serf_bucket_t *bucket,
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apr_size_t requested,
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const char **data, apr_size_t *len)
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{
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struct iovec vec[1];
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apr_status_t status;
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int vecs_used;
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status = serf_iovec_read_iovec(bucket, requested, 1, vec, &vecs_used);
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if (vecs_used) {
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*data = vec[0].iov_base;
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*len = vec[0].iov_len;
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} else {
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*len = 0;
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}
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return status;
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}
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static apr_status_t serf_iovec_peek(serf_bucket_t *bucket,
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const char **data,
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apr_size_t *len)
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{
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iovec_context_t *ctx = bucket->data;
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if (ctx->current_vec >= ctx->vecs_len) {
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*len = 0;
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return APR_EOF;
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}
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/* Return the first unread buffer, don't bother combining all
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remaining data. */
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*data = ctx->vecs[ctx->current_vec].iov_base;
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*len = ctx->vecs[ctx->current_vec].iov_len;
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if (ctx->current_vec + 1 == ctx->vecs_len)
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return APR_EOF;
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return APR_SUCCESS;
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}
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static void serf_iovec_destroy(serf_bucket_t *bucket)
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{
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iovec_context_t *ctx = bucket->data;
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serf_bucket_mem_free(bucket->allocator, ctx->vecs);
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serf_default_destroy_and_data(bucket);
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}
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const serf_bucket_type_t serf_bucket_type_iovec = {
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"IOVEC",
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serf_iovec_read,
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serf_iovec_readline,
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serf_iovec_read_iovec,
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serf_default_read_for_sendfile,
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serf_default_read_bucket,
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serf_iovec_peek,
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serf_iovec_destroy,
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};
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