1/* ====================================================================
2 *    Licensed to the Apache Software Foundation (ASF) under one
3 *    or more contributor license agreements.  See the NOTICE file
4 *    distributed with this work for additional information
5 *    regarding copyright ownership.  The ASF licenses this file
6 *    to you under the Apache License, Version 2.0 (the
7 *    "License"); you may not use this file except in compliance
8 *    with the License.  You may obtain a copy of the License at
9 *
10 *      http://www.apache.org/licenses/LICENSE-2.0
11 *
12 *    Unless required by applicable law or agreed to in writing,
13 *    software distributed under the License is distributed on an
14 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 *    KIND, either express or implied.  See the License for the
16 *    specific language governing permissions and limitations
17 *    under the License.
18 * ====================================================================
19 */
20
21#include <apr_pools.h>
22
23#include "serf.h"
24#include "serf_bucket_util.h"
25
26
27typedef struct {
28    struct iovec *vecs;
29
30    /* Total number of buffer stored in the vecs var. */
31    int vecs_len;
32    /* Points to the first unread buffer. */
33    int current_vec;
34    /* First buffer offset. */
35    int offset;
36} iovec_context_t;
37
38serf_bucket_t *serf_bucket_iovec_create(
39    struct iovec vecs[],
40    int len,
41    serf_bucket_alloc_t *allocator)
42{
43    iovec_context_t *ctx;
44    int i;
45
46    ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
47    ctx->vecs = serf_bucket_mem_alloc(allocator, len * sizeof(struct iovec));
48    ctx->vecs_len = len;
49    ctx->current_vec = 0;
50    ctx->offset = 0;
51
52    /* copy all buffers to our iovec. */
53    for (i = 0; i < len; i++) {
54        ctx->vecs[i].iov_base = vecs[i].iov_base;
55        ctx->vecs[i].iov_len = vecs[i].iov_len;
56    }
57
58    return serf_bucket_create(&serf_bucket_type_iovec, allocator, ctx);
59}
60
61static apr_status_t serf_iovec_readline(serf_bucket_t *bucket,
62                                         int acceptable, int *found,
63                                         const char **data, apr_size_t *len)
64{
65    return APR_ENOTIMPL;
66}
67
68static apr_status_t serf_iovec_read_iovec(serf_bucket_t *bucket,
69                                          apr_size_t requested,
70                                          int vecs_size,
71                                          struct iovec *vecs,
72                                          int *vecs_used)
73{
74    iovec_context_t *ctx = bucket->data;
75
76    *vecs_used = 0;
77
78    /* copy the requested amount of buffers to the provided iovec. */
79    for (; ctx->current_vec < ctx->vecs_len; ctx->current_vec++) {
80        struct iovec vec = ctx->vecs[ctx->current_vec];
81        apr_size_t remaining;
82
83        if (requested != SERF_READ_ALL_AVAIL && requested <= 0)
84            break;
85        if (*vecs_used >= vecs_size)
86            break;
87
88        vecs[*vecs_used].iov_base = (char*)vec.iov_base + ctx->offset;
89        remaining = vec.iov_len - ctx->offset;
90
91        /* Less bytes requested than remaining in the current buffer. */
92        if (requested != SERF_READ_ALL_AVAIL && requested < remaining) {
93            vecs[*vecs_used].iov_len = requested;
94            ctx->offset += requested;
95            requested = 0;
96            (*vecs_used)++;
97            break;
98        } else {
99            /* Copy the complete buffer. */
100            vecs[*vecs_used].iov_len = remaining;
101            ctx->offset = 0;
102            if (requested != SERF_READ_ALL_AVAIL)
103                requested -= remaining;
104            (*vecs_used)++;
105        }
106    }
107
108    if (ctx->current_vec == ctx->vecs_len && !ctx->offset)
109        return APR_EOF;
110
111    return APR_SUCCESS;
112}
113
114static apr_status_t serf_iovec_read(serf_bucket_t *bucket,
115                                    apr_size_t requested,
116                                    const char **data, apr_size_t *len)
117{
118    struct iovec vec[1];
119    apr_status_t status;
120    int vecs_used;
121
122    status = serf_iovec_read_iovec(bucket, requested, 1, vec, &vecs_used);
123
124    if (vecs_used) {
125        *data = vec[0].iov_base;
126        *len = vec[0].iov_len;
127    } else {
128        *len = 0;
129    }
130
131    return status;
132}
133
134static apr_status_t serf_iovec_peek(serf_bucket_t *bucket,
135                                    const char **data,
136                                    apr_size_t *len)
137{
138    iovec_context_t *ctx = bucket->data;
139
140    if (ctx->current_vec >= ctx->vecs_len) {
141        *len = 0;
142        return APR_EOF;
143    }
144
145    /* Return the first unread buffer, don't bother combining all
146       remaining data. */
147    *data = ctx->vecs[ctx->current_vec].iov_base;
148    *len = ctx->vecs[ctx->current_vec].iov_len;
149
150    if (ctx->current_vec + 1 == ctx->vecs_len)
151        return APR_EOF;
152
153    return APR_SUCCESS;
154}
155
156static void serf_iovec_destroy(serf_bucket_t *bucket)
157{
158    iovec_context_t *ctx = bucket->data;
159
160    serf_bucket_mem_free(bucket->allocator, ctx->vecs);
161    serf_default_destroy_and_data(bucket);
162}
163
164
165const serf_bucket_type_t serf_bucket_type_iovec = {
166    "IOVEC",
167    serf_iovec_read,
168    serf_iovec_readline,
169    serf_iovec_read_iovec,
170    serf_default_read_for_sendfile,
171    serf_default_read_bucket,
172    serf_iovec_peek,
173    serf_iovec_destroy,
174};
175