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/*
* Copyright 2004 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/base/transformadapter.h"
#include <string.h>
#include "webrtc/base/common.h"
namespace rtc {
///////////////////////////////////////////////////////////////////////////////
TransformAdapter::TransformAdapter(StreamInterface * stream,
TransformInterface * transform,
bool direction_read)
: StreamAdapterInterface(stream), transform_(transform),
direction_read_(direction_read), state_(ST_PROCESSING), len_(0) {
}
TransformAdapter::~TransformAdapter() {
TransformAdapter::Close();
delete transform_;
}
StreamResult
TransformAdapter::Read(void * buffer, size_t buffer_len,
size_t * read, int * error) {
if (!direction_read_)
return SR_EOS;
while (state_ != ST_ERROR) {
if (state_ == ST_COMPLETE)
return SR_EOS;
// Buffer more data
if ((state_ == ST_PROCESSING) && (len_ < sizeof(buffer_))) {
size_t subread;
StreamResult result = StreamAdapterInterface::Read(
buffer_ + len_,
sizeof(buffer_) - len_,
&subread,
&error_);
if (result == SR_BLOCK) {
return SR_BLOCK;
} else if (result == SR_ERROR) {
state_ = ST_ERROR;
break;
} else if (result == SR_EOS) {
state_ = ST_FLUSHING;
} else {
len_ += subread;
}
}
// Process buffered data
size_t in_len = len_;
size_t out_len = buffer_len;
StreamResult result = transform_->Transform(buffer_, &in_len,
buffer, &out_len,
(state_ == ST_FLUSHING));
ASSERT(result != SR_BLOCK);
if (result == SR_EOS) {
// Note: Don't signal SR_EOS this iteration, unless out_len is zero
state_ = ST_COMPLETE;
} else if (result == SR_ERROR) {
state_ = ST_ERROR;
error_ = -1; // TODO: propagate error
break;
} else if ((out_len == 0) && (state_ == ST_FLUSHING)) {
// If there is no output AND no more input, then something is wrong
state_ = ST_ERROR;
error_ = -1; // TODO: better error code?
break;
}
len_ -= in_len;
if (len_ > 0)
memmove(buffer_, buffer_ + in_len, len_);
if (out_len == 0)
continue;
if (read)
*read = out_len;
return SR_SUCCESS;
}
if (error)
*error = error_;
return SR_ERROR;
}
StreamResult
TransformAdapter::Write(const void * data, size_t data_len,
size_t * written, int * error) {
if (direction_read_)
return SR_EOS;
size_t bytes_written = 0;
while (state_ != ST_ERROR) {
if (state_ == ST_COMPLETE)
return SR_EOS;
if (len_ < sizeof(buffer_)) {
// Process buffered data
size_t in_len = data_len;
size_t out_len = sizeof(buffer_) - len_;
StreamResult result = transform_->Transform(data, &in_len,
buffer_ + len_, &out_len,
(state_ == ST_FLUSHING));
ASSERT(result != SR_BLOCK);
if (result == SR_EOS) {
// Note: Don't signal SR_EOS this iteration, unless no data written
state_ = ST_COMPLETE;
} else if (result == SR_ERROR) {
ASSERT(false); // When this happens, think about what should be done
state_ = ST_ERROR;
error_ = -1; // TODO: propagate error
break;
}
len_ = out_len;
bytes_written = in_len;
}
size_t pos = 0;
while (pos < len_) {
size_t subwritten;
StreamResult result = StreamAdapterInterface::Write(buffer_ + pos,
len_ - pos,
&subwritten,
&error_);
if (result == SR_BLOCK) {
ASSERT(false); // TODO: we should handle this
return SR_BLOCK;
} else if (result == SR_ERROR) {
state_ = ST_ERROR;
break;
} else if (result == SR_EOS) {
state_ = ST_COMPLETE;
break;
}
pos += subwritten;
}
len_ -= pos;
if (len_ > 0)
memmove(buffer_, buffer_ + pos, len_);
if (bytes_written == 0)
continue;
if (written)
*written = bytes_written;
return SR_SUCCESS;
}
if (error)
*error = error_;
return SR_ERROR;
}
void
TransformAdapter::Close() {
if (!direction_read_ && (state_ == ST_PROCESSING)) {
state_ = ST_FLUSHING;
do {
Write(0, 0, NULL, NULL);
} while (state_ == ST_FLUSHING);
}
state_ = ST_COMPLETE;
StreamAdapterInterface::Close();
}
bool TransformAdapter::GetAvailable(size_t* size) const {
return false;
}
bool TransformAdapter::ReserveSize(size_t size) {
return true;
}
bool TransformAdapter::Rewind() {
return false;
}
} // namespace rtc
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