1 files changed, 206 insertions, 0 deletions
diff --git a/labb6/src/huffmanutil.cpp b/labb6/src/huffmanutil.cpp
new file mode 100755
index 0000000..918a7c3
--- /dev/null
+++ b/labb6/src/huffmanutil.cpp
@@ -0,0 +1,206 @@
+/*
+ * TDDD86 Huffman Encoding
+ * This file defines various utility functions used by the main client program.
+ * See huffmanutil.h for documentation of each function.
+ *
+ * Please do not modify this provided file. Your turned-in files should work
+ * with an unmodified version of all provided code files.
+ */
+
+#include "huffmanutil.h"
+#include "bitstream.h"
+#include "strlib.h"
+#include "simpio.h"
+
+string bitsToBytes(string text) {
+    istringbitstream input(text);
+    ostringstream out;
+    while (true) {
+        int bit = input.readBit();
+        if (input.fail()) {
+            break;
+        }
+        out.put(bit == 1 ? '1' : '0');
+    }
+    return out.str();
+}
+
+string bytesToBits(string text) {
+    ostringbitstream out;
+    for (int i = 0; i < (int) text.length(); i++) {
+        out.writeBit(text[i] == '1' ? 1 : 0);
+    }
+    return out.str();
+}
+
+#if defined(_WIN32) || defined(_WIN64)
+    #include <windows.h>
+#else
+    // assume POSIX
+    #include <sys/stat.h>
+#endif
+
+bool confirmOverwrite(string filename) {
+#if defined(_WIN32) || defined(_WIN64)
+    bool fileExists = (GetFileAttributesA(filename.c_str()) != INVALID_FILE_ATTRIBUTES);
+#else
+    // assume POSIX
+    struct stat fileInfo;
+    bool fileExists = (stat(filename.c_str(), &fileInfo) == 0);
+#endif
+    if (!fileExists) {
+        return true;
+    } else {
+        return yesOrNo(filename + " already exists.  Overwrite? (y/n) ");
+    }
+}
+
+int fileSize(string filename) {
+    ifstream input;
+    input.open(filename.c_str(), ifstream::binary);
+    input.seekg(0, ifstream::end);
+    return (int) input.tellg();
+}
+
+void printBits(string text) {
+    istringbitstream input(text);
+    int i = 0;
+    while (true) {
+        i++;
+        int bit = input.readBit();
+        if (input.fail()) break;
+        cout << bit;
+        if (i > 0 && i % 8 == 0) {
+            cout << " ";
+        }
+        if (i > 0 && i % 64 == 0) {
+            cout << endl;
+        }
+    }
+    cout << endl;
+}
+
+string promptForExistingFileName(string prompt) {
+    while (true) {
+        string filename = getLine(prompt);
+#if defined(_WIN32) || defined(_WIN64)
+        bool fileExists = (GetFileAttributesA(filename.c_str()) != INVALID_FILE_ATTRIBUTES);
+#else
+        // assume POSIX
+        struct stat fileInfo;
+        bool fileExists =  (stat(filename.c_str(), &fileInfo) == 0);
+#endif
+        if (fileExists) {
+            return filename;
+        } else {
+            cout << "That file does not exist; please try again." << endl;
+        }
+    }
+    return "";
+}
+
+string readEntireFileText(string filename) {
+    ifstream input;
+    input.open(filename.c_str());
+    return readEntireFileText(input);
+}
+
+string readEntireFileText(istream& input) {
+    ostringstream out;
+    while (true) {
+        int ch = input.get();
+        if (input.fail()) {
+            break;
+        }
+        out << (char) ch;
+    }
+    return out.str();
+}
+
+string stringReplace(string s, char oldChar, char newChar) {
+    for (int i = (int) s.length() - 1; i >= 0; i--) {
+        if (s[i] == oldChar) {
+            s[i] = newChar;
+        }
+    }
+    return s;
+}
+
+string stringReplace(string s, char oldChar, string newStr) {
+    for (int i = (int) s.length() - 1; i >= 0; i--) {
+        if (s[i] == oldChar) {
+            s.erase(i, 1);
+            if (newStr.length() > 0) {
+                s.insert(i, newStr);
+            }
+        }
+    }
+    return s;
+}
+
+string stringReplace(string s, string oldStr, string newStr) {
+    int l2 = oldStr.length();
+    for (int i = (int) (s.length() - l2); i >= 0; i--) {
+        if (s.substr(i, l2) == oldStr) {
+            s.replace(i, l2, newStr);
+        }
+    }
+    return s;
+}
+
+/*
+ * Returns a printable string for the given character.  See bitstream.h.
+ */
+string toPrintableChar(int ch) {
+    if (ch == '\n') {
+        return "'\\n'";
+    } else if (ch == '\t') {
+        return "'\\t'";
+    } else if (ch == '\r') {
+        return "'\\r'";
+    } else if (ch == '\f') {
+        return "'\\f'";
+    } else if (ch == '\b') {
+        return "'\\b'";
+    } else if (ch == '\0') {
+        return "'\\0'";
+    } else if (ch == ' ') {
+        return "' '";
+    } else if (ch == (int) PSEUDO_EOF) {
+        return "EOF";
+    } else if (ch == (int) NOT_A_CHAR) {
+        return "NONE";
+    } else if (!isgraph(ch)) {
+        return "???";
+    } else {
+        return string("'") + (char) ch + string("'");
+    }
+}
+
+bool yesOrNo(string prompt) {
+    while (true) {
+        string answer = trim(toLowerCase(getLine(prompt)));
+        if (startsWith(answer, 'y')) {
+            return true;
+        } else if (startsWith(answer, 'n')) {
+            return false;
+        } else {
+            cout << "Please type a word that begins with 'y' or 'n'." << endl;
+        }
+    }
+}
+
+string getRoot(string filename) {
+   int dot = -1;
+   int len = filename.length();
+   for (int i = 0; i < len; i++) {
+      char ch = filename[i];
+      if (ch == '.') dot = i;
+      if (ch == '/' || ch == '\\') dot = -1;
+   }
+   if (dot == -1) {
+      return filename;
+   } else {
+      return filename.substr(0, dot);
+   }
+}