diff options
Add files via upload
1 files changed, 139 insertions, 0 deletions
| -rw-r--r-- | Sem. 03/HexViewer/HexViewer.cpp | 139 |
diff --git a/Sem. 03/HexViewer/HexViewer.cpp b/Sem. 03/HexViewer/HexViewer.cpp new file mode 100644 index 0000000..e4da57e --- /dev/null +++ b/Sem. 03/HexViewer/HexViewer.cpp @@ -0,0 +1,139 @@ +#pragma once
+#include "HexViewer.h"
+#include <fstream>
+#include <iostream>
+
+
+size_t getFileSize(std::ifstream& f)
+{
+ size_t currentPos = f.tellg();
+ f.seekg(0, std::ios::end);
+ size_t size = f.tellg();
+
+ f.seekg(currentPos);
+ return size;
+}
+HexViewer::HexViewer(const char* fileName)
+{
+ std::ifstream file(fileName, std::ios::binary);
+ if (!file.is_open())
+ {
+ size = 0;
+ data = nullptr;
+ return;
+ }
+ size_t bytesCount = getFileSize(file);
+ data = new unsigned char[bytesCount];
+
+ file.read((char*)data, bytesCount);
+ size = bytesCount;
+}
+
+unsigned char convertSymbolToNumber(char symbol)
+{
+ if (symbol >= '0' && symbol <= '9')
+ return symbol - '0';
+ else if (symbol >= 'A' && symbol <= 'Z')
+ return symbol - 'A' + 10;
+ return '\0';
+}
+
+size_t getSymbolIndex(char ch)
+{
+ if ('0' <= ch && ch <= '9')
+ return ch - '0';
+ else if ('A' <= ch && ch <= 'F')
+ return ch - 'A';
+ else
+ return 0; //error ?
+}
+
+unsigned char HexViewergetByte(const char* byteStr)
+{
+ if (strlen(byteStr) != 2)
+ return 0;
+ return getSymbolIndex(byteStr[1]) + getSymbolIndex(byteStr[0]) * 16;
+}
+
+void resize(unsigned char*& data, size_t& size, size_t newSize)
+{
+ unsigned char* newDataArr = new unsigned char[newSize];
+
+ size_t minSize = std::min(size, newSize);
+ for (unsigned i = 0; i < minSize; i++)
+ newDataArr[i] = data[i];
+
+ delete[] data;
+ data = newDataArr;
+ size = newSize;
+}
+
+void HexViewer::addByte(const char* byteStr)
+{
+ if (strlen(byteStr) != 2)
+ return;
+ unsigned char currentByte = 16*convertSymbolToNumber(byteStr[0]) + convertSymbolToNumber(byteStr[1]);
+ resize(data, size, size + 1);
+ data[size - 1] = currentByte;
+}
+void HexViewer::removeLastByte()
+{
+ if (size == 0)
+ return;
+ resize(data, size, size - 1);
+
+}
+void HexViewer::changeByte(size_t index, const char* byteStr)
+{
+ if (index >= size || strlen(byteStr) != 2)
+ return;
+
+ unsigned char currentByte = convertSymbolToNumber(byteStr[1]) + 16 * convertSymbolToNumber(byteStr[0]);
+ data[index] = currentByte;
+}
+
+void HexViewer::saveAs(const char* fileName) const
+{
+ std::ofstream file(fileName, std::ios::binary);
+
+ if (!file.is_open())
+ return;
+ file.write((const char*)data, size);
+}
+
+void convertToHex(unsigned char byte, char* byteHex)
+{
+ char symbols[] = { '0','1', '2', '3', '4', '5', '6','7',
+ '8','9', 'A', 'B', 'C', 'D', 'E', 'F' };
+ byteHex[2] = '\0';
+ byteHex[1] = symbols[byte % 16];
+ byteHex[0] = symbols[(byte / 16) % 16];
+}
+
+bool isLetter(char ch)
+{
+ return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z');
+}
+void HexViewer::print() const
+{
+ for (unsigned i = 0; i < size; i++)
+ {
+ char byteHex[3];
+ convertToHex(data[i], byteHex);
+ std::cout << byteHex << " ";
+ }
+ std::cout << std::endl;
+ for (unsigned i = 0; i < size; i++)
+ {
+ if (isLetter(data[i]))
+ std::cout << data[i];
+ else
+ std::cout << ".";
+ std::cout << " ";
+ }
+ std::cout << std::endl;
+}
+HexViewer::~HexViewer()
+{
+ delete[] data;
+}
|