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/* Copyright 2002-2004 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_strings.h>
#include "serf.h"
#include "serf_bucket_util.h"
typedef struct {
serf_bucket_t *stream;
enum {
STATE_SIZE, /* reading the chunk size */
STATE_CHUNK, /* reading the chunk */
STATE_TERM, /* reading the chunk terminator */
STATE_DONE /* body is done; we've returned EOF */
} state;
/* Buffer for accumulating a chunk size. */
serf_linebuf_t linebuf;
/* How much of the chunk, or the terminator, do we have left to read? */
apr_int64_t body_left;
} dechunk_context_t;
serf_bucket_t *serf_bucket_dechunk_create(
serf_bucket_t *stream,
serf_bucket_alloc_t *allocator)
{
dechunk_context_t *ctx;
ctx = serf_bucket_mem_alloc(allocator, sizeof(*ctx));
ctx->stream = stream;
ctx->state = STATE_SIZE;
serf_linebuf_init(&ctx->linebuf);
return serf_bucket_create(&serf_bucket_type_dechunk, allocator, ctx);
}
static void serf_dechunk_destroy_and_data(serf_bucket_t *bucket)
{
dechunk_context_t *ctx = bucket->data;
serf_bucket_destroy(ctx->stream);
serf_default_destroy_and_data(bucket);
}
static apr_status_t serf_dechunk_read(serf_bucket_t *bucket,
apr_size_t requested,
const char **data, apr_size_t *len)
{
dechunk_context_t *ctx = bucket->data;
apr_status_t status;
while (1) {
switch (ctx->state) {
case STATE_SIZE:
/* fetch a line terminated by CRLF */
status = serf_linebuf_fetch(&ctx->linebuf, ctx->stream,
SERF_NEWLINE_CRLF);
if (SERF_BUCKET_READ_ERROR(status))
return status;
/* if a line was read, then parse it. */
if (ctx->linebuf.state == SERF_LINEBUF_READY) {
/* NUL-terminate the line. if it filled the entire buffer,
then just assume the thing is too large. */
if (ctx->linebuf.used == sizeof(ctx->linebuf.line))
return APR_FROM_OS_ERROR(ERANGE);
ctx->linebuf.line[ctx->linebuf.used] = '\0';
/* convert from HEX digits. */
ctx->body_left = apr_strtoi64(ctx->linebuf.line, NULL, 16);
if (errno == ERANGE) {
return APR_FROM_OS_ERROR(ERANGE);
}
if (ctx->body_left == 0) {
/* Just read the last-chunk marker. We're DONE. */
ctx->state = STATE_DONE;
status = APR_EOF;
}
else {
/* Got a size, so we'll start reading the chunk now. */
ctx->state = STATE_CHUNK;
}
/* If we can read more, then go do so. */
if (!status)
continue;
}
/* assert: status != 0 */
/* Note that we didn't actually read anything, so our callers
* don't get confused.
*/
*len = 0;
return status;
case STATE_CHUNK:
if (requested > ctx->body_left) {
requested = ctx->body_left;
}
/* Delegate to the stream bucket to do the read. */
status = serf_bucket_read(ctx->stream, requested, data, len);
if (SERF_BUCKET_READ_ERROR(status))
return status;
/* Some data was read, so decrement the amount left and see
* if we're done reading this chunk.
*/
ctx->body_left -= *len;
if (!ctx->body_left) {
ctx->state = STATE_TERM;
ctx->body_left = 2; /* CRLF */
}
/* We need more data but there is no more available. */
if (ctx->body_left && APR_STATUS_IS_EOF(status)) {
return SERF_ERROR_TRUNCATED_HTTP_RESPONSE;
}
/* Return the data we just read. */
return status;
case STATE_TERM:
/* Delegate to the stream bucket to do the read. */
status = serf_bucket_read(ctx->stream, ctx->body_left, data, len);
if (SERF_BUCKET_READ_ERROR(status))
return status;
/* Some data was read, so decrement the amount left and see
* if we're done reading the chunk terminator.
*/
ctx->body_left -= *len;
/* We need more data but there is no more available. */
if (ctx->body_left && APR_STATUS_IS_EOF(status))
return SERF_ERROR_TRUNCATED_HTTP_RESPONSE;
if (!ctx->body_left) {
ctx->state = STATE_SIZE;
}
if (status)
return status;
break;
case STATE_DONE:
/* Just keep returning EOF */
return APR_EOF;
default:
/* Not reachable */
return APR_EGENERAL;
}
}
/* NOTREACHED */
}
/* ### need to implement */
#define serf_dechunk_readline NULL
#define serf_dechunk_peek NULL
const serf_bucket_type_t serf_bucket_type_dechunk = {
"DECHUNK",
serf_dechunk_read,
serf_dechunk_readline,
serf_default_read_iovec,
serf_default_read_for_sendfile,
serf_default_read_bucket,
serf_dechunk_peek,
serf_dechunk_destroy_and_data,
};
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