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+//
+// C++ Implementation: gptpart
+//
+// Description: Class to implement a SINGLE GPT partition
+//
+//
+// Author: Rod Smith <rodsmith@rodsbooks.com>, (C) 2009
+//
+// Copyright: See COPYING file that comes with this distribution
+//
+//
+/* This program is copyright (c) 2009 by Roderick W. Smith. It is distributed
+  under the terms of the GNU GPL version 2, as detailed in the COPYING file. */
+
+#define __STDC_LIMIT_MACROS
+#define __STDC_CONSTANT_MACROS
+
+#include <stdio.h>
+#include <string.h>
+#include "gptpart.h"
+#include "attributes.h"
+
+using namespace std;
+
+PartTypes GPTPart::typeHelper;
+
+GPTPart::GPTPart(void) {
+} // Default constructor
+
+GPTPart::~GPTPart(void) {
+} // destructor
+
+// Return partition's name field
+unsigned char* GPTPart::GetName(unsigned char* ref) {
+   if (ref == NULL)
+      ref = (unsigned char*) malloc(NAME_SIZE * sizeof (unsigned char));
+   strcpy((char*) ref, (char*) name);
+   return ref;
+} // GPTPart::GetName()
+
+// Return the gdisk-specific two-byte hex code for the partition
+uint16_t GPTPart::GetHexType(void) {
+   return typeHelper.GUIDToID(partitionType);
+} // GPTPart::GetHexType()
+
+// Return a plain-text description of the partition type (e.g., "Linux/Windows
+// data" or "Linux swap").
+char* GPTPart::GetNameType(char* theName) {
+   return typeHelper.GUIDToName(partitionType, theName);
+} // GPTPart::GetNameType()
+
+// Compute and return the partition's length (or 0 if the end is incorrectly
+// set before the beginning).
+uint64_t GPTPart::GetLengthLBA(void) {
+   uint64_t length = 0;
+   if (firstLBA <= lastLBA)
+      length = lastLBA - firstLBA + UINT64_C(1);
+   return length;
+} // GPTPart::GetLengthLBA()
+
+GPTPart & GPTPart::operator=(const GPTPart & orig) {
+   int i;
+
+   partitionType = orig.partitionType;
+   uniqueGUID = orig.uniqueGUID;
+   firstLBA = orig.firstLBA;
+   lastLBA = orig.lastLBA;
+   attributes = orig.attributes;
+   for (i = 0; i < NAME_SIZE; i++)
+      name[i] = orig.name[i];
+} // assignment operator
+
+// Sets the unique GUID to a value of 0 or a random value,
+// depending on the parameter: 0 = 0, anything else = random
+void GPTPart::SetUniqueGUID(int zeroOrRandom) {
+   if (zeroOrRandom == 0) {
+      uniqueGUID.data1 = 0;
+      uniqueGUID.data2 = 0;
+   } else {
+      // rand() is only 32 bits on 32-bit systems, so multiply together to
+      // fill a 64-bit value.
+      uniqueGUID.data1 = (uint64_t) rand() * (uint64_t) rand();
+      uniqueGUID.data2 = (uint64_t) rand() * (uint64_t) rand();
+   }
+} // GPTPart::SetUniqueGUID()
+
+// Blank (delete) a single partition
+void GPTPart::BlankPartition(void) {
+   int j;
+   GUIDData zeroGUID;
+
+   zeroGUID.data1 = 0;
+   zeroGUID.data2 = 0;
+   uniqueGUID = zeroGUID;
+   partitionType = zeroGUID;
+   firstLBA = 0;
+   lastLBA = 0;
+   attributes = 0;
+   for (j = 0; j < NAME_SIZE; j++)
+      name[j] = '\0';
+} // GPTPart::BlankPartition
+
+// Returns 1 if the two partitions overlap, 0 if they don't
+int GPTPart::DoTheyOverlap(GPTPart* other) {
+   int theyDo = 0;
+
+   // Don't bother checking unless these are defined (both start and end points
+   // are 0 for undefined partitions, so just check the start points)
+   if ((firstLBA != 0) && (other->firstLBA != 0)) {
+      if ((firstLBA < other->lastLBA) && (lastLBA >= other->firstLBA))
+         theyDo = 1;
+      if ((other->firstLBA < lastLBA) && (other->lastLBA >= firstLBA))
+         theyDo = 1;
+   } // if
+   return (theyDo);
+} // GPTPart::DoTheyOverlap()
+
+// Reverse the bytes of integral data types; used on big-endian systems.
+void GPTPart::ReversePartBytes(void) {
+   ReverseBytes(&partitionType.data1, 8);
+   ReverseBytes(&partitionType.data2, 8);
+   ReverseBytes(&uniqueGUID.data1, 8);
+   ReverseBytes(&uniqueGUID.data2, 8);
+   ReverseBytes(&firstLBA, 8);
+   ReverseBytes(&lastLBA, 8);
+   ReverseBytes(&attributes, 8);
+} // GPTPart::ReverseBytes()
+
+// Display summary information; does nothing if the partition is empty.
+void GPTPart::ShowSummary(int i, uint32_t blockSize, char* sizeInSI) {
+   int j;
+
+   if (firstLBA != 0) {
+      BytesToSI(blockSize * (lastLBA - firstLBA + 1), sizeInSI);
+      printf("%4d  %14lu  %14lu", i + 1, (unsigned long) firstLBA,
+             (unsigned long) lastLBA);
+      printf("   %-10s  %04X  ", sizeInSI,
+             typeHelper.GUIDToID(partitionType));
+      j = 0;
+      while ((name[j] != '\0') && (j < 44)) {
+         printf("%c", name[j]);
+         j += 2;
+      } // while
+      printf("\n");
+   } // if
+} // GPTPart::ShowSummary()
+
+// Show detailed partition information. Does nothing if the partition is
+// empty (as determined by firstLBA being 0).
+void GPTPart::ShowDetails(uint32_t blockSize) {
+   char temp[255];
+   int i;
+   uint64_t size;
+
+   if (firstLBA != 0) {
+      printf("Partition GUID code: %s ", GUIDToStr(partitionType, temp));
+      printf("(%s)\n", typeHelper.GUIDToName(partitionType, temp));
+      printf("Partition unique GUID: %s\n", GUIDToStr(uniqueGUID, temp));
+
+      printf("First sector: %llu (at %s)\n", (unsigned long long) firstLBA,
+             BytesToSI(firstLBA * blockSize, temp));
+      printf("Last sector: %llu (at %s)\n", (unsigned long long) lastLBA,
+             BytesToSI(lastLBA * blockSize, temp));
+      size = (lastLBA - firstLBA + 1);
+      printf("Partition size: %llu sectors (%s)\n", (unsigned long long)
+             size, BytesToSI(size * ((uint64_t) blockSize), temp));
+      printf("Attribute flags: %016llx\n", (unsigned long long) attributes);
+      printf("Partition name: ");
+      i = 0;
+      while ((name[i] != '\0') && (i < NAME_SIZE)) {
+         printf("%c", name[i]);
+         i += 2;
+      } // while
+      printf("\n");
+   }  // if
+} // GPTPart::ShowDetails()
+
+/****************************************
+ * Functions requiring user interaction *
+ ****************************************/
+
+// Change the type code on the partition.
+void GPTPart::ChangeType(void) {
+   char typeName[255], line[255];
+   int typeNum = 0xFFFF;
+//   uint16_t typeNum = 0xFFFF;
+   GUIDData newType;
+
+   printf("Current type is '%s'\n", GetNameType(line));
+//   printf("Current type is '%s'\n", typeHelper.GUIDToName(partitionType, typeName));
+   while ((!typeHelper.Valid(typeNum)) && (typeNum != 0)) {
+      printf("Hex code (L to show codes, 0 to enter raw code): ");
+      fgets(line, 255, stdin);
+      sscanf(line, "%X", &typeNum);
+      if ((line[0] == 'L') || (line[0] == 'l'))
+         typeHelper.ShowTypes();
+   } // while
+   if (typeNum != 0) // user entered a code, so convert it
+      newType = typeHelper.IDToGUID((uint16_t) typeNum);
+   else // user wants to enter the GUID directly, so do that
+      newType = GetGUID();
+   partitionType = newType;
+   printf("Changed system type of partition to '%s'\n",
+          typeHelper.GUIDToName(partitionType, typeName));
+} // GPTPart::ChangeType()
+
+// Set the name for a partition to theName, or prompt for a name if
+// theName is a NULL pointer. Note that theName is a standard C-style
+// string, although the GUID partition definition requires a UTF-16LE
+// string. This function creates a simple-minded copy for this.
+void GPTPart::SetName(unsigned char* theName) {
+   char newName[NAME_SIZE]; // New name
+   int i;
+
+   // Blank out new name string, just to be on the safe side....
+   for (i = 0; i < NAME_SIZE; i++)
+      newName[i] = '\0';
+
+   if (theName == NULL) { // No name specified, so get one from the user
+      printf("Enter name: ");
+      fgets(newName, NAME_SIZE / 2, stdin);
+
+      // Input is likely to include a newline, so remove it....
+      i = strlen(newName);
+      if (newName[i - 1] == '\n')
+         newName[i - 1] = '\0';
+   } else {
+      strcpy(newName, (char*) theName);
+   } // if
+
+   // Copy the C-style ASCII string from newName into a form that the GPT
+   // table will accept....
+   for (i = 0; i < NAME_SIZE; i++) {
+      if ((i % 2) == 0) {
+         name[i] = newName[(i / 2)];
+      } else {
+         name[i] = '\0';
+      } // if/else
+   } // for
+} // GPTPart::SetName()
+
+/***********************************
+ * Non-class but related functions *
+ ***********************************/
+
+// Recursive quick sort algorithm for GPT partitions. Note that if there
+// are any empties in the specified range, they'll be sorted to the
+// start, resulting in a sorted set of partitions that begins with
+// partition 2, 3, or higher.
+void QuickSortGPT(GPTPart* partitions, int start, int finish) {
+   uint64_t starterValue; // starting location of median partition
+   int left, right;
+   GPTPart temp;
+
+   left = start;
+   right = finish;
+   starterValue = partitions[(start + finish) / 2].GetFirstLBA();
+   do {
+      while (partitions[left].GetFirstLBA() < starterValue)
+         left++;
+      while (partitions[right].GetFirstLBA() > starterValue)
+         right--;
+      if (left <= right) {
+         temp = partitions[left];
+         partitions[left] = partitions[right];
+         partitions[right] = temp;
+         left++;
+         right--;
+      } // if
+   } while (left <= right);
+   if (start < right) QuickSortGPT(partitions, start, right);
+   if (finish > left) QuickSortGPT(partitions, left, finish);
+} // QuickSortGPT()
+