Candidate release of source code.

Ghidra/Features/Decompiler/src/decompile/cpp/loadimage.cc

@@ -0,0 +1,112 @@
+/* ###
+ * IP: GHIDRA
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "loadimage.hh"
+
+/// This is a convenience method wrapped around the core
+/// loadFill() routine.  It automatically allocates an array
+/// of the desired size, and then fills it with load image data.
+/// If the array cannot be allocated, an exception is thrown.
+/// The caller assumes the responsibility of freeing the
+/// array after it has been used.
+/// \param size is the number of bytes to read from the image
+/// \param addr is the address of the first byte being read
+/// \return a pointer to the desired bytes
+uint1 *LoadImage::load(int4 size,const Address &addr)
+
+{
+  uint1 *buf = new uint1[ size ];
+  if (buf == (uint1 *)0)
+    throw LowlevelError("Out of memory");
+  loadFill(buf,size,addr);
+  return buf;
+}
+
+RawLoadImage::RawLoadImage(const string &f) : LoadImage(f)
+
+{
+  vma = 0;
+  thefile = (ifstream *)0;
+  spaceid = (AddrSpace *)0;
+  filesize = 0;
+}
+
+RawLoadImage::~RawLoadImage(void)
+
+{
+  if (thefile != (ifstream *)0) {
+    thefile->close();
+    delete thefile;
+  }
+}
+
+/// The file is opened and its size immediately recovered.
+void RawLoadImage::open(void)
+
+{
+  if (thefile != (ifstream *)0) throw LowlevelError("loadimage is already open");
+  thefile = new ifstream(filename.c_str());
+  if (!(*thefile)) {
+    string errmsg = "Unable to open raw image file: "+filename;
+    throw LowlevelError(errmsg);
+  }
+  thefile->seekg(0,ios::end);
+  filesize = thefile->tellg();
+}
+
+string RawLoadImage::getArchType(void) const
+
+{
+  return "unknown";
+}
+
+void RawLoadImage::adjustVma(long adjust)
+
+{
+  adjust = AddrSpace::addressToByte(adjust,spaceid->getWordSize());
+  vma += adjust;
+}
+
+void RawLoadImage::loadFill(uint1 *ptr,int4 size,const Address &addr)
+
+{
+  uintb curaddr = addr.getOffset();
+  uintb offset = 0;
+  uintb readsize;
+
+  curaddr -= vma;		// Get relative offset of first byte
+  while(size>0) {
+    if (curaddr >= filesize) {
+      if (offset == 0)		// Initial address not within file
+	break;
+      memset(ptr+offset,0,size); // Fill out the rest of the buffer with 0
+      return;
+    }
+    readsize = size;
+    if (curaddr + readsize > filesize) // Adjust to biggest possible read
+      readsize = filesize - curaddr;
+    thefile->seekg(curaddr);
+    thefile->read((char *)(ptr+offset),readsize);
+    offset += readsize;
+    size -= readsize;
+    curaddr += readsize;
+  }
+  if (size > 0) {
+    ostringstream errmsg;
+    errmsg << "Unable to load " << dec << size << " bytes at " << addr.getShortcut();
+    addr.printRaw(errmsg);
+    throw DataUnavailError(errmsg.str());
+  }
+}