diff options
Diffstat (limited to 'buckets/iovec_buckets.c')
| -rw-r--r-- | buckets/iovec_buckets.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/buckets/iovec_buckets.c b/buckets/iovec_buckets.c new file mode 100644 index 0000000000000..9ac1d8d17941b --- /dev/null +++ b/buckets/iovec_buckets.c @@ -0,0 +1,169 @@ +/* Copyright 2011 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" + + +typedef struct { + struct iovec *vecs; + + /* Total number of buffer stored in the vecs var. */ + int vecs_len; + /* Points to the first unread buffer. */ + int current_vec; + /* First buffer offset. */ + int offset; +} iovec_context_t; + +serf_bucket_t *serf_bucket_iovec_create( + struct iovec vecs[], + int len, + serf_bucket_alloc_t *allocator) +{ + iovec_context_t *ctx; + int i; + + ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx)); + ctx->vecs = serf_bucket_mem_alloc(allocator, len * sizeof(struct iovec)); + ctx->vecs_len = len; + ctx->current_vec = 0; + ctx->offset = 0; + + /* copy all buffers to our iovec. */ + for (i = 0; i < len; i++) { + ctx->vecs[i].iov_base = vecs[i].iov_base; + ctx->vecs[i].iov_len = vecs[i].iov_len; + } + + return serf_bucket_create(&serf_bucket_type_iovec, allocator, ctx); +} + +static apr_status_t serf_iovec_readline(serf_bucket_t *bucket, + int acceptable, int *found, + const char **data, apr_size_t *len) +{ + return APR_ENOTIMPL; +} + +static apr_status_t serf_iovec_read_iovec(serf_bucket_t *bucket, + apr_size_t requested, + int vecs_size, + struct iovec *vecs, + int *vecs_used) +{ + iovec_context_t *ctx = bucket->data; + + *vecs_used = 0; + + /* copy the requested amount of buffers to the provided iovec. */ + for (; ctx->current_vec < ctx->vecs_len; ctx->current_vec++) { + struct iovec vec = ctx->vecs[ctx->current_vec]; + apr_size_t remaining; + + if (requested != SERF_READ_ALL_AVAIL && requested <= 0) + break; + if (*vecs_used >= vecs_size) + break; + + vecs[*vecs_used].iov_base = (char*)vec.iov_base + ctx->offset; + remaining = vec.iov_len - ctx->offset; + + /* Less bytes requested than remaining in the current buffer. */ + if (requested != SERF_READ_ALL_AVAIL && requested < remaining) { + vecs[*vecs_used].iov_len = requested; + ctx->offset += requested; + requested = 0; + (*vecs_used)++; + break; + } else { + /* Copy the complete buffer. */ + vecs[*vecs_used].iov_len = remaining; + ctx->offset = 0; + if (requested != SERF_READ_ALL_AVAIL) + requested -= remaining; + (*vecs_used)++; + } + } + + if (ctx->current_vec == ctx->vecs_len && !ctx->offset) + return APR_EOF; + + return APR_SUCCESS; +} + +static apr_status_t serf_iovec_read(serf_bucket_t *bucket, + apr_size_t requested, + const char **data, apr_size_t *len) +{ + struct iovec vec[1]; + apr_status_t status; + int vecs_used; + + status = serf_iovec_read_iovec(bucket, requested, 1, vec, &vecs_used); + + if (vecs_used) { + *data = vec[0].iov_base; + *len = vec[0].iov_len; + } else { + *len = 0; + } + + return status; +} + +static apr_status_t serf_iovec_peek(serf_bucket_t *bucket, + const char **data, + apr_size_t *len) +{ + iovec_context_t *ctx = bucket->data; + + if (ctx->current_vec >= ctx->vecs_len) { + *len = 0; + return APR_EOF; + } + + /* Return the first unread buffer, don't bother combining all + remaining data. */ + *data = ctx->vecs[ctx->current_vec].iov_base; + *len = ctx->vecs[ctx->current_vec].iov_len; + + if (ctx->current_vec + 1 == ctx->vecs_len) + return APR_EOF; + + return APR_SUCCESS; +} + +static void serf_iovec_destroy(serf_bucket_t *bucket) +{ + iovec_context_t *ctx = bucket->data; + + serf_bucket_mem_free(bucket->allocator, ctx->vecs); + serf_default_destroy_and_data(bucket); +} + + +const serf_bucket_type_t serf_bucket_type_iovec = { + "IOVEC", + serf_iovec_read, + serf_iovec_readline, + serf_iovec_read_iovec, + serf_default_read_for_sendfile, + serf_default_read_bucket, + serf_iovec_peek, + serf_iovec_destroy, +}; |