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/* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*/
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#include <apr_strings.h>
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#include "serf.h"
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#include "serf_bucket_util.h"
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typedef struct {
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serf_bucket_t *stream;
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enum {
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STATE_SIZE, /* reading the chunk size */
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STATE_CHUNK, /* reading the chunk */
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STATE_TERM, /* reading the chunk terminator */
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STATE_DONE /* body is done; we've returned EOF */
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} state;
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/* Buffer for accumulating a chunk size. */
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serf_linebuf_t linebuf;
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/* How much of the chunk, or the terminator, do we have left to read? */
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apr_int64_t body_left;
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} dechunk_context_t;
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serf_bucket_t *serf_bucket_dechunk_create(
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serf_bucket_t *stream,
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serf_bucket_alloc_t *allocator)
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{
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dechunk_context_t *ctx;
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ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
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ctx->stream = stream;
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ctx->state = STATE_SIZE;
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serf_linebuf_init(&ctx->linebuf);
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return serf_bucket_create(&serf_bucket_type_dechunk, allocator, ctx);
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}
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static void serf_dechunk_destroy_and_data(serf_bucket_t *bucket)
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{
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dechunk_context_t *ctx = bucket->data;
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serf_bucket_destroy(ctx->stream);
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serf_default_destroy_and_data(bucket);
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}
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static apr_status_t serf_dechunk_read(serf_bucket_t *bucket,
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apr_size_t requested,
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const char **data, apr_size_t *len)
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{
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dechunk_context_t *ctx = bucket->data;
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apr_status_t status;
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while (1) {
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switch (ctx->state) {
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case STATE_SIZE:
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/* fetch a line terminated by CRLF */
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status = serf_linebuf_fetch(&ctx->linebuf, ctx->stream,
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SERF_NEWLINE_CRLF);
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if (SERF_BUCKET_READ_ERROR(status))
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return status;
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/* if a line was read, then parse it. */
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if (ctx->linebuf.state == SERF_LINEBUF_READY) {
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/* NUL-terminate the line. if it filled the entire buffer,
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then just assume the thing is too large. */
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if (ctx->linebuf.used == sizeof(ctx->linebuf.line))
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return APR_FROM_OS_ERROR(ERANGE);
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ctx->linebuf.line[ctx->linebuf.used] = '\0';
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/* convert from HEX digits. */
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ctx->body_left = apr_strtoi64(ctx->linebuf.line, NULL, 16);
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if (errno == ERANGE) {
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return APR_FROM_OS_ERROR(ERANGE);
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}
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if (ctx->body_left == 0) {
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/* Just read the last-chunk marker. We're DONE. */
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ctx->state = STATE_DONE;
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status = APR_EOF;
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}
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else {
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/* Got a size, so we'll start reading the chunk now. */
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ctx->state = STATE_CHUNK;
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}
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/* If we can read more, then go do so. */
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if (!status)
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continue;
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}
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/* assert: status != 0 */
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/* Note that we didn't actually read anything, so our callers
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* don't get confused.
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*/
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*len = 0;
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return status;
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case STATE_CHUNK:
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if (requested > ctx->body_left) {
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requested = ctx->body_left;
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}
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/* Delegate to the stream bucket to do the read. */
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status = serf_bucket_read(ctx->stream, requested, data, len);
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if (SERF_BUCKET_READ_ERROR(status))
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return status;
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/* Some data was read, so decrement the amount left and see
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* if we're done reading this chunk.
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*/
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ctx->body_left -= *len;
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if (!ctx->body_left) {
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ctx->state = STATE_TERM;
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ctx->body_left = 2; /* CRLF */
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}
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/* We need more data but there is no more available. */
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if (ctx->body_left && APR_STATUS_IS_EOF(status)) {
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return SERF_ERROR_TRUNCATED_HTTP_RESPONSE;
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}
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/* Return the data we just read. */
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return status;
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case STATE_TERM:
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/* Delegate to the stream bucket to do the read. */
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status = serf_bucket_read(ctx->stream, ctx->body_left, data, len);
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if (SERF_BUCKET_READ_ERROR(status))
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return status;
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/* Some data was read, so decrement the amount left and see
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* if we're done reading the chunk terminator.
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*/
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ctx->body_left -= *len;
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/* We need more data but there is no more available. */
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if (ctx->body_left && APR_STATUS_IS_EOF(status))
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return SERF_ERROR_TRUNCATED_HTTP_RESPONSE;
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if (!ctx->body_left) {
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ctx->state = STATE_SIZE;
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}
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/* Don't return the CR of CRLF to the caller! */
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*len = 0;
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if (status)
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return status;
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break;
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case STATE_DONE:
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/* Just keep returning EOF */
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*len = 0;
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return APR_EOF;
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default:
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/* Not reachable */
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return APR_EGENERAL;
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}
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}
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/* NOTREACHED */
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}
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/* ### need to implement */
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#define serf_dechunk_readline NULL
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#define serf_dechunk_peek NULL
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const serf_bucket_type_t serf_bucket_type_dechunk = {
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"DECHUNK",
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serf_dechunk_read,
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serf_dechunk_readline,
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serf_default_read_iovec,
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serf_default_read_for_sendfile,
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serf_default_read_bucket,
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serf_dechunk_peek,
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serf_dechunk_destroy_and_data,
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};
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