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/* Copyright 2002-2004 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"
#include "serf_private.h"
typedef struct {
serf_bucket_t *stream;
apr_uint64_t remaining;
} limit_context_t;
serf_bucket_t *serf_bucket_limit_create(
serf_bucket_t *stream, apr_uint64_t len, serf_bucket_alloc_t *allocator)
{
limit_context_t *ctx;
ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
ctx->stream = stream;
ctx->remaining = len;
return serf_bucket_create(&serf_bucket_type_limit, allocator, ctx);
}
static apr_status_t serf_limit_read(serf_bucket_t *bucket,
apr_size_t requested,
const char **data, apr_size_t *len)
{
limit_context_t *ctx = bucket->data;
apr_status_t status;
if (!ctx->remaining) {
*len = 0;
return APR_EOF;
}
if (requested == SERF_READ_ALL_AVAIL || requested > ctx->remaining) {
if (ctx->remaining <= REQUESTED_MAX) {
requested = (apr_size_t) ctx->remaining;
} else {
requested = REQUESTED_MAX;
}
}
status = serf_bucket_read(ctx->stream, requested, data, len);
if (!SERF_BUCKET_READ_ERROR(status)) {
ctx->remaining -= *len;
}
/* If we have met our limit and don't have a status, return EOF. */
if (!ctx->remaining && !status) {
status = APR_EOF;
}
return status;
}
static apr_status_t serf_limit_readline(serf_bucket_t *bucket,
int acceptable, int *found,
const char **data, apr_size_t *len)
{
limit_context_t *ctx = bucket->data;
apr_status_t status;
if (!ctx->remaining) {
*len = 0;
return APR_EOF;
}
status = serf_bucket_readline(ctx->stream, acceptable, found, data, len);
if (!SERF_BUCKET_READ_ERROR(status)) {
ctx->remaining -= *len;
}
/* If we have met our limit and don't have a status, return EOF. */
if (!ctx->remaining && !status) {
status = APR_EOF;
}
return status;
}
static apr_status_t serf_limit_peek(serf_bucket_t *bucket,
const char **data,
apr_size_t *len)
{
limit_context_t *ctx = bucket->data;
return serf_bucket_peek(ctx->stream, data, len);
}
static void serf_limit_destroy(serf_bucket_t *bucket)
{
limit_context_t *ctx = bucket->data;
serf_bucket_destroy(ctx->stream);
serf_default_destroy_and_data(bucket);
}
const serf_bucket_type_t serf_bucket_type_limit = {
"LIMIT",
serf_limit_read,
serf_limit_readline,
serf_default_read_iovec,
serf_default_read_for_sendfile,
serf_default_read_bucket,
serf_limit_peek,
serf_limit_destroy,
};
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