88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
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/* xdelta3 - delta compression tools and library -*- Mode: C++ -*-
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Copyright 2016 Joshua MacDonald
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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class Delta {
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public:
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Delta(const Block &block) {
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int ret;
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xd3_config config;
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memset(&stream_, 0, sizeof (stream_));
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memset(&config, 0, sizeof (config));
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xd3_init_config(&config, XD3_SKIP_EMIT | XD3_ADLER32_NOVER);
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CHECK_EQ(0, xd3_config_stream (&stream_, &config));
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xd3_avail_input (&stream_, block.Data(), block.Size());
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bool done = false;
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while (!done) {
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ret = xd3_decode_input(&stream_);
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switch (ret) {
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case XD3_INPUT:
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done = true;
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break;
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case XD3_OUTPUT:
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CHECK_EQ(0, xd3_whole_append_window (&stream_));
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break;
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case XD3_GOTHEADER:
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case XD3_WINSTART:
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case XD3_WINFINISH:
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break;
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default:
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cerr << "decode: " << done;
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abort();
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}
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}
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}
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~Delta() {
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xd3_free_stream(&stream_);
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}
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xoff_t AddedBytes() const {
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return stream_.whole_target.addslen;
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}
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xoff_t Windows() const {
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return stream_.whole_target.wininfolen;
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}
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// Note: This does not benefit from -Wformat= checking, due to the
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// enclosing template. Further, it was not used.
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// void Print() const {
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// for (size_t i = 0; i < stream_.whole_target.instlen; i++) {
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// xd3_winst &winst = stream_.whole_target.inst[i];
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// switch (winst.type) {
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// case XD3_RUN:
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// DP(RINT, "%" Q "u run %" W "u\n", winst.position, winst.size);
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// break;
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// case XD3_ADD:
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// DP(RINT "%" Q "u add %" W "u\n", winst.position, winst.size);
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// break;
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// default:
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// DP(RINT "%" Q "u copy %" W "u @ %" Q "u (mode %u)\n",
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// winst.position, winst.size, winst.addr, winst.mode);
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// break;
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// }
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// }
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// }
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private:
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xd3_stream stream_;
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};
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