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 */
}
/* 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;
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 */
}
static apr_status_t fetch_line(response_context_t *ctx, int acceptable)
{
return serf_linebuf_fetch(&ctx->linebuf, ctx->stream, acceptable);
}
