1 files changed, 211 insertions, 0 deletions
diff --git a/src/im_sysfile_unix.cpp b/src/im_sysfile_unix.cpp
new file mode 100644
index 0000000..2065bb6
--- /dev/null
+++ b/src/im_sysfile_unix.cpp
@@ -0,0 +1,211 @@
+/** \file
+ * \brief System Dependent Binary File Access (UNIX)
+ *
+ * See Copyright Notice in im_lib.h
+ * $Id: im_sysfile_unix.cpp,v 1.1 2008/10/17 06:10:16 scuri Exp $
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "im_util.h"
+#include "im_binfile.h"
+
+
+class imBinSystemFile: public imBinFileBase
+{
+protected:
+  int FileHandle, 
+      Error;
+
+  unsigned long ReadBuf(void* pValues, unsigned long pSize);
+  unsigned long WriteBuf(void* pValues, unsigned long pSize);
+
+public:
+  virtual void Open(const char* pFileName);
+  virtual void New(const char* pFileName);
+  virtual void Close();
+
+  unsigned long FileSize();
+  int HasError() const;
+  void SeekTo(unsigned long pOffset);
+  void SeekOffset(long pOffset);
+  void SeekFrom(long pOffset);
+  unsigned long Tell() const;
+  int EndOfFile() const;
+};
+
+imBinFileBase* iBinSystemFileNewFunc()
+{
+  return new imBinSystemFile();
+}
+
+void imBinSystemFile::Open(const char* pFileName)
+{
+  int mode = O_RDONLY;
+#ifdef O_BINARY
+    mode |= O_BINARY;
+#endif        
+  this->FileHandle = open(pFileName, mode, 0);
+  if (this->FileHandle < 0) 
+    this->Error = errno;
+  else
+    this->Error = 0;
+  InitByteOrder(imBinCPUByteOrder());
+  this->IsNew = 0;
+}
+
+void imBinSystemFile::New(const char* pFileName)
+{
+  int mode = O_WRONLY | O_CREAT | O_TRUNC;           
+#ifdef O_BINARY
+    mode |= O_BINARY;
+#endif        
+  this->FileHandle = open(pFileName, mode, 0666); // User/Group/Other can read and write
+  if (this->FileHandle < 0) 
+    this->Error = errno;
+  else
+    this->Error = 0;
+  InitByteOrder(imBinCPUByteOrder());
+  this->IsNew = 1;
+}
+
+void imBinSystemFile::Close()
+{
+  assert(this->FileHandle > -1);
+  int ret = close(this->FileHandle);
+  if (ret < 0)
+    this->Error = errno;
+  else
+    this->Error = 0;
+}
+
+int imBinSystemFile::HasError() const
+{
+  if (this->FileHandle < 0 || this->Error) return 1;
+  return 0;
+}
+
+unsigned long imBinSystemFile::ReadBuf(void* pValues, unsigned long pSize)
+{
+  assert(this->FileHandle > -1);
+	int ret = read(this->FileHandle, pValues, (size_t)pSize);
+  if (ret < 0)
+    this->Error = errno;
+  else
+    this->Error = 0;
+  return ret < 0? 0: ret;
+}
+                             
+unsigned long imBinSystemFile::WriteBuf(void* pValues, unsigned long pSize)
+{
+  assert(this->FileHandle > -1);
+  int ret = write(this->FileHandle, pValues, (size_t)pSize);
+  if (ret < 0)
+    this->Error = errno;
+  else
+    this->Error = 0;
+  return ret < 0? 0: ret;
+}
+
+void imBinSystemFile::SeekTo(unsigned long pOffset)
+{
+  assert(this->FileHandle > -1);
+  int ret = lseek(this->FileHandle, pOffset, SEEK_SET);
+  if (ret < 0)
+    this->Error = errno;
+  else
+    this->Error = 0;
+}
+
+void imBinSystemFile::SeekOffset(long pOffset)
+{
+  assert(this->FileHandle > -1);
+  int ret = lseek(this->FileHandle, pOffset, SEEK_CUR);
+  if (ret < 0)
+    this->Error = errno;
+  else
+    this->Error = 0;
+}
+
+void imBinSystemFile::SeekFrom(long pOffset)
+{
+  assert(this->FileHandle > -1);
+  int ret = lseek(this->FileHandle, pOffset, SEEK_END);
+  if (ret < 0)
+    this->Error = errno;
+  else
+    this->Error = 0;
+}
+
+unsigned long imBinSystemFile::Tell() const
+{
+  assert(this->FileHandle > -1);
+  long offset = lseek(this->FileHandle, 0L, SEEK_CUR);
+  return offset < 0? 0: offset;
+}
+
+unsigned long imBinSystemFile::FileSize()
+{
+  assert(this->FileHandle > -1);
+  long lCurrentPosition = lseek(this->FileHandle, 0L, SEEK_CUR);
+  long lSize = lseek(this->FileHandle, 0L, SEEK_END);
+  lseek(this->FileHandle, lCurrentPosition, SEEK_SET);
+  return lSize < 0? 0: lSize;
+}
+
+int imBinSystemFile::EndOfFile() const
+{
+  assert(this->FileHandle > -1);
+  long lCurrentPosition = lseek(this->FileHandle, 0L, SEEK_CUR);
+  long lSize = lseek(this->FileHandle, 0L, SEEK_END);
+  lseek(this->FileHandle, lCurrentPosition, SEEK_SET);
+  return lCurrentPosition == lSize? 1: 0;
+}
+
+
+
+class imBinSystemFileHandle: public imBinSystemFile
+{
+public:
+  virtual void Open(const char* pFileName);
+  virtual void New(const char* pFileName);
+  virtual void Close();
+};
+
+imBinFileBase* iBinSystemFileHandleNewFunc()
+{
+  return new imBinSystemFileHandle();
+}
+
+void imBinSystemFileHandle::Open(const char* pFileName)
+{
+  // the file was successfully opened already by the client
+
+  int *s = (int*)pFileName;
+  this->FileHandle = s[0];
+  InitByteOrder(imBinCPUByteOrder());
+  this->IsNew = 0;
+  this->Error = 0;
+}
+
+void imBinSystemFileHandle::New(const char* pFileName)
+{
+  // the file was successfully opened already the client
+
+  int *s = (int*)pFileName;
+  this->FileHandle = s[0];
+  InitByteOrder(imBinCPUByteOrder());
+  this->IsNew = 1;
+  this->Error = 0;
+}
+
+void imBinSystemFileHandle::Close()
+{
+  // does nothing, the client must close the file
+}