3 * Copyright 2004--2005, Google Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
8 * 1. Redistributions of source code must retain the above copyright notice,
9 * this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright notice,
11 * this list of conditions and the following disclaimer in the documentation
12 * and/or other materials provided with the distribution.
13 * 3. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #include "talk/base/transformadapter.h"
32 #include "talk/base/common.h"
36 ///////////////////////////////////////////////////////////////////////////////
38 TransformAdapter::TransformAdapter(StreamInterface * stream,
39 TransformInterface * transform,
41 : StreamAdapterInterface(stream), transform_(transform),
42 direction_read_(direction_read), state_(ST_PROCESSING), len_(0) {
45 TransformAdapter::~TransformAdapter() {
46 TransformAdapter::Close();
51 TransformAdapter::Read(void * buffer, size_t buffer_len,
52 size_t * read, int * error) {
56 while (state_ != ST_ERROR) {
57 if (state_ == ST_COMPLETE)
61 if ((state_ == ST_PROCESSING) && (len_ < sizeof(buffer_))) {
63 StreamResult result = StreamAdapterInterface::Read(
65 sizeof(buffer_) - len_,
68 if (result == SR_BLOCK) {
70 } else if (result == SR_ERROR) {
73 } else if (result == SR_EOS) {
80 // Process buffered data
82 size_t out_len = buffer_len;
83 StreamResult result = transform_->Transform(buffer_, &in_len,
85 (state_ == ST_FLUSHING));
86 ASSERT(result != SR_BLOCK);
87 if (result == SR_EOS) {
88 // Note: Don't signal SR_EOS this iteration, unless out_len is zero
90 } else if (result == SR_ERROR) {
92 error_ = -1; // TODO: propagate error
94 } else if ((out_len == 0) && (state_ == ST_FLUSHING)) {
95 // If there is no output AND no more input, then something is wrong
97 error_ = -1; // TODO: better error code?
103 memmove(buffer_, buffer_ + in_len, len_);
119 TransformAdapter::Write(const void * data, size_t data_len,
120 size_t * written, int * error) {
124 size_t bytes_written = 0;
125 while (state_ != ST_ERROR) {
126 if (state_ == ST_COMPLETE)
129 if (len_ < sizeof(buffer_)) {
130 // Process buffered data
131 size_t in_len = data_len;
132 size_t out_len = sizeof(buffer_) - len_;
133 StreamResult result = transform_->Transform(data, &in_len,
134 buffer_ + len_, &out_len,
135 (state_ == ST_FLUSHING));
137 ASSERT(result != SR_BLOCK);
138 if (result == SR_EOS) {
139 // Note: Don't signal SR_EOS this iteration, unless no data written
140 state_ = ST_COMPLETE;
141 } else if (result == SR_ERROR) {
142 ASSERT(false); // When this happens, think about what should be done
144 error_ = -1; // TODO: propagate error
149 bytes_written = in_len;
155 StreamResult result = StreamAdapterInterface::Write(buffer_ + pos,
159 if (result == SR_BLOCK) {
160 ASSERT(false); // TODO: we should handle this
162 } else if (result == SR_ERROR) {
165 } else if (result == SR_EOS) {
166 state_ = ST_COMPLETE;
175 memmove(buffer_, buffer_ + pos, len_);
177 if (bytes_written == 0)
181 *written = bytes_written;
191 TransformAdapter::Close() {
192 if (!direction_read_ && (state_ == ST_PROCESSING)) {
193 state_ = ST_FLUSHING;
195 Write(0, 0, NULL, NULL);
196 } while (state_ == ST_FLUSHING);
198 state_ = ST_COMPLETE;
199 StreamAdapterInterface::Close();
202 } // namespace talk_base