1 files changed, 276 insertions, 0 deletions

diff --git a/src/hdb/db.cc b/src/hdb/db.cc
new file mode 100644
index 0000000..0cc9827
--- /dev/null
+++ b/src/hdb/db.cc
@@ -0,0 +1,276 @@
+/*************************************************************************
+ *
+ * HTCd - Copyright (C) 1998-2006 Henrik Rydberg
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <hdb/db.h>
+#include <new>
+
+filemap* dbmap::flist;
+mutex_t dbmap::mutex;
+opmap dbmap::M;
+
+///////////////////////////////////////////////////////////////////////
+
+dbmap::dbmap():
+  wok(0),fatal(0),index(0),
+  compname(),file(0),tmap(),recs()
+{
+  minor=0;
+  major=0;
+}
+
+dbmap::~dbmap()
+{
+  Close();
+}
+
+///////////////////////////////////////////////////////////////////////
+
+void dbmap::remap_tabs()
+{
+  fatal=head()->fatal.get();
+  tmap.clear();
+  for(int i=0;i<Tables();i++) tmap.add(sref(head()->tabs[i]),i);
+}
+
+void dbmap::remap_recs()
+{
+  major=head()->major.get();
+  recs.clear();
+  int p=file->recs();
+  while(file->size(p)) {
+    record_t* rec=(record_t*)file->at(p);
+    if(rec->caps.get())
+      recs.push_back(idx_t(rec->at(index),rec));
+    p+=rec->mem.get();
+  }
+  recs.sort(CompOperator(compname));
+}
+
+int dbmap::remap()
+{
+  int state=0;
+  if(fatal!=head()->fatal.get()) { remap_tabs(); state|=4; }
+  if(major!=head()->major.get()) { remap_recs(); state|=2; }
+  if(minor!=head()->minor.get()) { minor=head()->minor.get(); state|=1; }
+  return state;
+}
+
+///////////////////////////////////////////////////////////////////////
+
+void Open(const mstring& path,int update=0,int prot=0600) throw(merror_t);
+void Saveas(const mstring& path,int prot=0600) throw(merror_t);
+void Close();
+
+void dbmap::Open(const mstring& path,int update,int prot) throw(merror_t)
+{
+  Close();
+  wok=update?1:0;
+  {
+    MLOCK(mutex);
+    for(filemap* p=flist;p;p=p->next)
+      if(p->Pathname()==path&&p->writable()==wok) { (file=p)->pushref(); break; }
+    if(!file) {
+      filemap* fm=new filemap(flist);
+      try { fm->open(path,wok,prot); fm->check(); file=flist=fm; }
+      catch(...) { delete fm; wok=0; throw; }
+    }
+  }
+  index=head()->index.get();
+  compname=head()->compname;
+  remap_tabs();
+  remap_recs();
+  minor=head()->minor.get();
+}
+
+void dbmap::Saveas(const mstring& path,int prot) throw(merror_t)
+{
+  file->save(path,prot);
+}
+
+void dbmap::Close()
+{
+  wok=0;
+  minor=0;
+  major=0;
+  fatal=0;
+  index=0;
+  compname.clear();
+  recs.clear();
+  tmap.clear();
+  if(file) {
+    MLOCK(mutex);
+    if(file->reference()) file->popref();
+    else {
+      if(flist==file) flist=file->next;
+      else for(filemap* p=flist;p;p=p->next)
+        if(p->next==file) { p->next=file->next; break; }
+      delete file;
+    }
+    file=0;
+  }
+}
+
+void dbmap::Sync()
+{
+  MLOCK(mutex);
+  for(filemap* p=flist;p;p=p->next) {
+    if(p->writable()) p->sync();
+  }
+}
+
+///////////////////////////////////////////////////////////////////////
+
+void dbmap::SetTable(int col,const sref& name) throw(merror_t)
+{
+  check();
+  if(!wok) THROW("db: cannot set table - readonly");
+  if(col<0||col>=Tables()) THROW("db: bad column");
+  HEADLOCK(file);
+  head()->set(col,name);
+  remap();
+}
+
+void dbmap::InsertTable(int col,const sref& name) throw(merror_t)
+{
+  check();
+  if(!wok) THROW("db: cannot insert table - readonly");
+  if(Tables()+1>file->maxtabs) THROW("db: too many tables");
+  if(col<0||col>Tables()) THROW("db: bad column");
+  {
+    HEADLOCK(file);
+    head()->insert(col,name);
+    int p=file->recs();
+    while(file->size(p)) {
+      record_t* rec=(record_t*)file->at(p);
+      if(rec->caps.get()) rec->insert(col);
+      p+=rec->mem.get();
+    }
+    head()->major.add(1);
+  }
+  index=head()->index.get();
+  compname=head()->compname;
+  remap();
+}
+
+void dbmap::RemTable(int col) throw(merror_t)
+{
+  check();
+  if(!wok) THROW("db: cannot remove table - readonly");
+  if(col<0||col>=Tables()) THROW("db: bad column");
+  if(col==head()->index.get()) THROW("db: cannot remove index table");
+  {
+    HEADLOCK(file);
+    head()->remove(col);
+    int p=file->recs();
+    while(file->size(p)) {
+      record_t* rec=(record_t*)file->at(p);
+      if(rec->caps.get()) rec->remove(col);
+      p+=rec->mem.get();
+    }
+    head()->major.add(1);
+  }
+  index=head()->index.get();
+  compname=head()->compname;
+  remap();
+}
+
+///////////////////////////////////////////////////////////////////////
+
+void dbmap::Get(int row,spile& list) throw(merror_t)
+{
+  check();
+  if(row<0||row>=recs.size()) THROW("db: not a valid record");
+  list.resize(Tables());
+  recs[row].rec->get(list);
+}
+
+void dbmap::Set(int row,int col,const sref& s) throw(merror_t)
+{
+  check();
+  if(!wok) THROW("db: cannot set - readonly");
+  if(row<0||row>=recs.size()) THROW("db: not a valid record");
+  if(col==index) THROW("db: cannot set index");
+  HEADLOCK(file);
+  record_t* rec=recs[row].rec;
+  int dim=rec->setreq(col,s);
+  if(dim>rec->caps.get()) {
+    rec=new(file->add(dim)) record_t(*rec);
+    file->rem(recs[row].rec);
+    recs[row].rec=rec;
+    head()->major.add(1);
+    major++;
+  }
+  rec->set(col,s);
+  head()->minor.add(1);
+  minor++;
+}
+
+void dbmap::Set(int row,const spile& list) throw(merror_t)
+{
+  check();
+  if(!wok) THROW("db: cannot set - readonly");
+  if(row<0||row>=recs.size()) THROW("db: not a valid record");
+  if(list.size()!=Tables())
+    THROW("db: wrong number of tables - "<<list.size()<<" should be "<<Tables());
+  HEADLOCK(file);
+  record_t* rec=recs[row].rec;
+  if(rec->at(index)!=list[index]) THROW("db: cannot set index");
+  int dim=record_t::req(list);
+  if(dim>rec->caps.get()) {
+    rec=new(file->add(dim)) record_t(*rec);
+    file->rem(recs[row].rec);
+    recs[row].rec=rec;
+    head()->major.add(1);
+    major++;
+  }
+  rec->set(list);
+  head()->minor.add(1);
+  minor++;
+}
+
+///////////////////////////////////////////////////////////////////////
+
+void dbmap::Rem(int row) throw(merror_t)
+{
+  if(!wok) THROW("db: cannot delete - readonly");
+  if(row<0||row>=recs.size()) THROW("db: not a valid record");
+  HEADLOCK(file);
+  file->rem(recs[row].rec);
+  recs.erase(recs.begin()+row);
+  head()->major.add(1);
+  major++;
+}
+
+int dbmap::Insert(const spile& list,int unique) throw(merror_t)
+{
+  check();
+  if(!wok) THROW("db: cannot insert - readonly");
+  if(index!=head()->index.get())
+    THROW("db: can only insert under normal order");
+  HEADLOCK(file);
+  remap();
+  int row=recs.get(list[index]);
+  if(row<0) {
+    record_t* rec=new(file->add(record_t::req(list))) record_t(list);
+    row=recs.add(rec->at(index),rec);
+    head()->major.add(1);
+    major++;
+  }
+  return row;
+}