| /* ==================================================================== |
| * 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" |
| |
| typedef struct prefix_context_t { |
| serf_bucket_t *stream; |
| apr_size_t prefix_len; |
| apr_size_t read_len; |
| |
| serf_bucket_prefix_handler_t handler; |
| void *handler_baton; |
| |
| char *buffer; |
| } prefix_context_t; |
| |
| |
| serf_bucket_t *serf_bucket_prefix_create(serf_bucket_t *stream, |
| apr_size_t prefix_len, |
| serf_bucket_prefix_handler_t handler, |
| void *handler_baton, |
| serf_bucket_alloc_t *allocator) |
| { |
| prefix_context_t *ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx)); |
| |
| ctx->stream = stream; |
| ctx->prefix_len = prefix_len; |
| ctx->read_len = 0; |
| |
| ctx->handler = handler; |
| ctx->handler_baton = handler_baton; |
| |
| ctx->buffer = NULL; |
| |
| return serf_bucket_create(&serf_bucket_type_prefix, allocator, ctx); |
| } |
| |
| static apr_status_t read_prefix(serf_bucket_t *bucket) |
| { |
| prefix_context_t *ctx = bucket->data; |
| const char *data; |
| apr_size_t len; |
| apr_status_t status; |
| |
| if (!ctx->read_len) { |
| |
| /* Perhaps we can handle this without copying any data? */ |
| status = serf_bucket_read(ctx->stream, ctx->prefix_len, &data, &len); |
| |
| if (!status && !len) |
| return SERF_ERROR_EMPTY_READ; |
| else if (SERF_BUCKET_READ_ERROR(status)) |
| return status; |
| |
| if (APR_STATUS_IS_EOF(status) || (len == ctx->prefix_len)) { |
| apr_status_t cb_status; |
| |
| /* Prefix reading is done */ |
| ctx->prefix_len = 0; |
| |
| cb_status = ctx->handler(ctx->handler_baton, ctx->stream, |
| data, len); |
| |
| if (SERF_BUCKET_READ_ERROR(cb_status)) |
| return cb_status; |
| |
| return status; |
| } |
| else if (len == 0) { |
| /* Nothing read at all. Try again later */ |
| return status; |
| } |
| |
| /* Create a buffer to hold what we already read */ |
| ctx->buffer = serf_bucket_mem_alloc(bucket->allocator, ctx->prefix_len); |
| memcpy(ctx->buffer, data, len); |
| ctx->read_len = len; |
| |
| if (status) |
| return status; |
| |
| /* Else: Try filling the rest of the buffer */ |
| } |
| |
| while (TRUE) { |
| |
| status = serf_bucket_read(ctx->stream, ctx->prefix_len - ctx->read_len, |
| &data, &len); |
| |
| if (SERF_BUCKET_READ_ERROR(status)) |
| return status; |
| else if (!status && !len) |
| return SERF_ERROR_EMPTY_READ; |
| |
| memcpy(ctx->buffer + ctx->read_len, data, len); |
| ctx->read_len += len; |
| |
| if (APR_STATUS_IS_EOF(status) || (ctx->prefix_len == ctx->read_len)) { |
| apr_status_t cb_status; |
| |
| /* Prefix reading is done */ |
| ctx->prefix_len = 0; |
| |
| cb_status = ctx->handler(ctx->handler_baton, ctx->stream, |
| ctx->buffer, ctx->read_len); |
| |
| serf_bucket_mem_free(bucket->allocator, ctx->buffer); |
| ctx->buffer = NULL; |
| |
| if (SERF_BUCKET_READ_ERROR(cb_status)) |
| return cb_status; |
| |
| return status; |
| } |
| else if (status) |
| return status; |
| } |
| } |
| |
| static apr_status_t serf_prefix_read(serf_bucket_t *bucket, |
| apr_size_t requested, |
| const char **data, |
| apr_size_t *len) |
| { |
| prefix_context_t *ctx = bucket->data; |
| |
| if (ctx->prefix_len) { |
| apr_status_t status = read_prefix(bucket); |
| |
| if (status) { |
| *len = 0; |
| return (status == SERF_ERROR_EMPTY_READ) ? APR_SUCCESS |
| : status; |
| } |
| } |
| |
| return serf_bucket_read(ctx->stream, requested, data, len); |
| } |
| |
| static apr_status_t serf_prefix_read_iovec(serf_bucket_t *bucket, |
| apr_size_t requested, |
| int vecs_size, |
| struct iovec *vecs, |
| int *vecs_used) |
| { |
| prefix_context_t *ctx = bucket->data; |
| |
| if (ctx->prefix_len) { |
| apr_status_t status = read_prefix(bucket); |
| |
| if (status) { |
| *vecs_used = 0; |
| return (status == SERF_ERROR_EMPTY_READ) ? APR_SUCCESS |
| : status; |
| } |
| } |
| |
| return serf_bucket_read_iovec(ctx->stream, requested, vecs_size, |
| vecs, vecs_used); |
| } |
| |
| static apr_status_t serf_prefix_peek(serf_bucket_t *bucket, |
| const char **data, |
| apr_size_t *len) |
| { |
| prefix_context_t *ctx = bucket->data; |
| |
| if (ctx->prefix_len) { |
| apr_status_t status = read_prefix(bucket); |
| |
| if (status) { |
| *len = 0; |
| return (status == SERF_ERROR_EMPTY_READ) ? APR_SUCCESS |
| : status; |
| } |
| } |
| |
| return serf_bucket_peek(ctx->stream, data, len); |
| } |
| |
| static apr_uint64_t serf_prefix_get_remaining(serf_bucket_t *bucket) |
| { |
| prefix_context_t *ctx = bucket->data; |
| apr_uint64_t remaining; |
| |
| remaining = serf_bucket_get_remaining(ctx->stream); |
| |
| if (remaining != SERF_LENGTH_UNKNOWN && ctx->prefix_len) { |
| remaining -= (ctx->prefix_len - ctx->read_len); |
| } |
| |
| return remaining; |
| } |
| |
| static apr_status_t serf_prefix_set_config(serf_bucket_t *bucket, |
| serf_config_t *config) |
| { |
| prefix_context_t *ctx = bucket->data; |
| |
| return serf_bucket_set_config(ctx->stream, config); |
| } |
| |
| static void serf_prefix_destroy(serf_bucket_t *bucket) |
| { |
| prefix_context_t *ctx = bucket->data; |
| |
| if (ctx->buffer) |
| serf_bucket_mem_free(bucket->allocator, ctx->buffer); |
| |
| serf_bucket_destroy(ctx->stream); |
| |
| serf_default_destroy_and_data(bucket); |
| } |
| |
| const serf_bucket_type_t serf_bucket_type_prefix = { |
| "prefix", |
| serf_prefix_read, |
| serf_default_readline, |
| serf_prefix_read_iovec, |
| serf_default_read_for_sendfile, |
| serf_buckets_are_v2, |
| serf_prefix_peek, |
| serf_prefix_destroy, |
| serf_default_read_bucket, |
| serf_prefix_get_remaining, |
| serf_prefix_set_config |
| }; |
| |
| |