contrib/serf/buckets/response_body_buckets.c

   1 /* Copyright 2002-2004 Justin Erenkrantz and Greg Stein
   2  *
   3  * Licensed under the Apache License, Version 2.0 (the "License");
   4  * you may not use this file except in compliance with the License.
   5  * You may obtain a copy of the License at
   6  *
   7  *     http://www.apache.org/licenses/LICENSE-2.0
   8  *
   9  * Unless required by applicable law or agreed to in writing, software
  10  * distributed under the License is distributed on an "AS IS" BASIS,
  11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12  * See the License for the specific language governing permissions and
  13  * limitations under the License.
  14  */
  15
  16 #include <apr_pools.h>
  17
  18 #include "serf.h"
  19 #include "serf_bucket_util.h"
  20
  21 /* Older versions of APR do not have this macro.  */
  22 #ifdef APR_SIZE_MAX
  23 #define REQUESTED_MAX APR_SIZE_MAX
  24 #else
  25 #define REQUESTED_MAX (~((apr_size_t)0))
  26 #endif
  27
  28
  29 typedef struct {
  30     serf_bucket_t *stream;
  31     apr_uint64_t remaining;
  32 } body_context_t;
  33
  34 serf_bucket_t *serf_bucket_response_body_create(
  35     serf_bucket_t *stream, apr_uint64_t len, serf_bucket_alloc_t *allocator)
  36 {
  37     body_context_t *ctx;
  38
  39     ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
  40     ctx->stream = stream;
  41     ctx->remaining = len;
  42
  43     return serf_bucket_create(&serf_bucket_type_response_body, allocator, ctx);
  44 }
  45
  46 static apr_status_t serf_response_body_read(serf_bucket_t *bucket,
  47                                             apr_size_t requested,
  48                                             const char **data,
  49                                             apr_size_t *len)
  50 {
  51     body_context_t *ctx = bucket->data;
  52     apr_status_t status;
  53
  54     if (!ctx->remaining) {
  55         *len = 0;
  56         return APR_EOF;
  57     }
  58
  59     if (requested == SERF_READ_ALL_AVAIL || requested > ctx->remaining) {
  60         if (ctx->remaining <= REQUESTED_MAX) {
  61             requested = (apr_size_t) ctx->remaining;
  62         } else {
  63             requested = REQUESTED_MAX;
  64         }
  65     }
  66
  67     status = serf_bucket_read(ctx->stream, requested, data, len);
  68
  69     if (!SERF_BUCKET_READ_ERROR(status)) {
  70         ctx->remaining -= *len;
  71     }
  72
  73     if (APR_STATUS_IS_EOF(status) && ctx->remaining > 0) {
  74         /* The server sent less data than expected. */
  75         status = SERF_ERROR_TRUNCATED_HTTP_RESPONSE;
  76     }
  77
  78     return status;
  79 }
  80
  81 static apr_status_t serf_response_body_readline(serf_bucket_t *bucket,
  82                                                 int acceptable, int *found,
  83                                                 const char **data,
  84                                                 apr_size_t *len)
  85 {
  86     body_context_t *ctx = bucket->data;
  87     apr_status_t status;
  88
  89     if (!ctx->remaining) {
  90         *len = 0;
  91         return APR_EOF;
  92     }
  93
  94     status = serf_bucket_readline(ctx->stream, acceptable, found, data, len);
  95
  96     if (!SERF_BUCKET_READ_ERROR(status)) {
  97         ctx->remaining -= *len;
  98     }
  99
 100     if (APR_STATUS_IS_EOF(status) && ctx->remaining > 0) {
 101         /* The server sent less data than expected. */
 102         status = SERF_ERROR_TRUNCATED_HTTP_RESPONSE;
 103     }
 104
 105     return status;
 106 }
 107
 108 static apr_status_t serf_response_body_peek(serf_bucket_t *bucket,
 109                                             const char **data,
 110                                             apr_size_t *len)
 111 {
 112     body_context_t *ctx = bucket->data;
 113
 114     return serf_bucket_peek(ctx->stream, data, len);
 115 }
 116
 117 static void serf_response_body_destroy(serf_bucket_t *bucket)
 118 {
 119     body_context_t *ctx = bucket->data;
 120
 121     serf_bucket_destroy(ctx->stream);
 122
 123     serf_default_destroy_and_data(bucket);
 124 }
 125
 126 const serf_bucket_type_t serf_bucket_type_response_body = {
 127     "RESPONSE_BODY",
 128     serf_response_body_read,
 129     serf_response_body_readline,
 130     serf_default_read_iovec,
 131     serf_default_read_for_sendfile,
 132     serf_default_read_bucket,
 133     serf_response_body_peek,
 134     serf_response_body_destroy,
 135 };