1 files changed, 201 insertions, 0 deletions
diff --git a/lib/Support/TreeStream.cpp b/lib/Support/TreeStream.cpp
new file mode 100644
index 00000000..0e8b86dd
--- /dev/null
+++ b/lib/Support/TreeStream.cpp
@@ -0,0 +1,201 @@
+//===-- TreeStream.cpp ----------------------------------------------------===//
+//
+//                     The KLEE Symbolic Virtual Machine
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "klee/Internal/ADT/TreeStream.h"
+
+#include <cassert>
+#include <iostream>
+#include <iomanip>
+#include <fstream>
+#include <iterator>
+#include <map>
+
+#include <string.h>
+
+using namespace klee;
+
+///
+
+TreeStreamWriter::TreeStreamWriter(const std::string &_path) 
+  : lastID(0),
+    bufferCount(0),
+    path(_path),
+    output(new std::ofstream(path.c_str(), 
+                             std::ios::out | std::ios::binary)),
+    ids(1) {
+  if (!output->good()) {
+    delete output;
+    output = 0;
+  }
+}
+
+TreeStreamWriter::~TreeStreamWriter() {
+  flush();
+  if (output)
+    delete output;
+}
+
+bool TreeStreamWriter::good() {
+  return !!output;
+}
+
+TreeOStream TreeStreamWriter::open() {
+  return open(TreeOStream(*this, 0));
+}
+
+TreeOStream TreeStreamWriter::open(const TreeOStream &os) {
+  assert(output && os.writer==this);
+  flushBuffer();
+  unsigned id = ids++;
+  output->write(reinterpret_cast<const char*>(&os.id), 4);
+  unsigned tag = id | (1<<31);
+  output->write(reinterpret_cast<const char*>(&tag), 4);
+  return TreeOStream(*this, id);
+}
+
+void TreeStreamWriter::write(TreeOStream &os, const char *s, unsigned size) {
+#if 1
+  if (bufferCount && 
+      (os.id!=lastID || size+bufferCount>bufferSize))
+    flushBuffer();
+  if (bufferCount) { // (os.id==lastID && size+bufferCount<=bufferSize)
+    memcpy(&buffer[bufferCount], s, size);
+    bufferCount += size;
+  } else if (size<bufferSize) {
+    lastID = os.id;
+    memcpy(buffer, s, size);
+    bufferCount = size;
+  } else {
+    output->write(reinterpret_cast<const char*>(&os.id), 4);
+    output->write(reinterpret_cast<const char*>(&size), 4);
+    output->write(buffer, size);
+  }
+#else
+  output->write(reinterpret_cast<const char*>(&os.id), 4);
+  output->write(reinterpret_cast<const char*>(&size), 4);
+  output->write(s, size);
+#endif
+}
+
+void TreeStreamWriter::flushBuffer() {
+  if (bufferCount) {    
+    output->write(reinterpret_cast<const char*>(&lastID), 4);
+    output->write(reinterpret_cast<const char*>(&bufferCount), 4);
+    output->write(buffer, bufferCount);
+    bufferCount = 0;
+  }
+}
+
+void TreeStreamWriter::flush() {
+  flushBuffer();
+  output->flush();
+}
+
+void TreeStreamWriter::readStream(TreeStreamID streamID,
+                                  std::vector<unsigned char> &out) {
+  assert(streamID>0 && streamID<ids);
+  flush();
+  
+  std::ifstream is(path.c_str(),
+                   std::ios::in | std::ios::binary);
+  assert(is.good());
+#if 0
+  std::cout << "finding chain for: " << streamID << "\n";
+#endif
+  
+  std::map<unsigned,unsigned> parents;
+  std::vector<unsigned> roots;
+  for (;;) {
+    assert(is.good());
+    unsigned id;
+    unsigned tag;
+    is.read(reinterpret_cast<char*>(&id), 4);
+    is.read(reinterpret_cast<char*>(&tag), 4);
+    if (tag&(1<<31)) { // fork
+      unsigned child = tag ^ (1<<31);
+
+      if (child==streamID) {
+        roots.push_back(child);
+        while (id) {
+          roots.push_back(id);
+          std::map<unsigned, unsigned>::iterator it = parents.find(id);
+          assert(it!=parents.end());
+          id = it->second;
+        } 
+        break;
+      } else {
+        parents.insert(std::make_pair(child,id));
+      }
+    } else {
+      unsigned size = tag;
+      while (size--) is.get();
+    }
+  }
+#if 0
+  std::cout << "roots: ";
+  std::copy(roots.begin(), roots.end(), std::ostream_iterator<unsigned>(std::cout, " "));
+  std::cout << "\n"; 
+#endif
+  is.seekg(0, std::ios::beg);
+  for (;;) {
+    unsigned id;
+    unsigned tag;
+    is.read(reinterpret_cast<char*>(&id), 4);
+    is.read(reinterpret_cast<char*>(&tag), 4);
+    if (!is.good()) break;
+    if (tag&(1<<31)) { // fork
+      unsigned child = tag ^ (1<<31);
+      if (id==roots.back() && roots.size()>1 && child==roots[roots.size()-2])
+        roots.pop_back();
+    } else {
+      unsigned size = tag;
+      if (id==roots.back()) {
+        while (size--) out.push_back(is.get());
+      } else {
+        while (size--) is.get();
+      }
+    }
+  }  
+}
+
+///
+
+TreeOStream::TreeOStream()
+  : writer(0),
+    id(0) {
+}
+
+TreeOStream::TreeOStream(TreeStreamWriter &_writer, unsigned _id)
+  : writer(&_writer),
+    id(_id) {
+}
+
+TreeOStream::~TreeOStream() {
+}
+
+unsigned TreeOStream::getID() const {
+  assert(writer);
+  return id;
+}
+
+void TreeOStream::write(const char *buffer, unsigned size) {
+  assert(writer);
+  writer->write(*this, buffer, size);
+}
+
+TreeOStream &TreeOStream::operator<<(const std::string &s) {
+  assert(writer);
+  write(s.c_str(), s.size());
+  return *this;
+}
+
+void TreeOStream::flush() {
+  assert(writer);
+  writer->flush();
+}