| /* ==================================================================== |
| * 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, |
| }; |