/* ====================================================================

 *    Licensed to the Apache Software Foundation (ASF) under one

 *    or more contributor license agreements.  See the NOTICE file

 *    distributed with this work for additional information

 *    regarding copyright ownership.  The ASF licenses this file

 *    to you 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,

};