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C/C(extra) ExtraAssignments/Stegano/stegano.c

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+/*
+ * stegano.c
+ *
+ *  Created on: Nov 6, 2011
+ *      Author: J. Geurts
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "bmp.h"
+#include "resource_detector.h"
+#include "stegano.h"
+
+#define MAX_FILENAME 80
+
+extern uint8_t SteganoGetSubstring(
+            uint8_t Src, uint8_t SrcPos, uint8_t NrOfBits, uint8_t DestPos)
+/* description: get a substring of bits from a uint8_t (i.e. a byte)
+ *
+ * example: SteganoGetSubstring (Src, 3, 4, 1) with Src=ABCDEFGH (bit H is LSB)
+ *          = 000BCDE0
+ *
+ * parameters:
+ *      Src:       byte to get the substring from
+ *      SrcPos:    position of the first bit of the substring (LSB=0)
+ *      NrOfBits:  length of the substring
+ *      DestPos:   position of the first bits of the destination substring
+ *
+ * return:
+ *      substring, starting at DestPos
+ */
+{
+    // to be implemented
+    return 0;
+}
+
+
+// should be static in real life, but would give a compiling error in the
+// unchanged code because this function is not yet used
+static void ReadHdr(
+            FILE* FilePtr, BMP_MAGIC_t* Magic, BMP_FILE_t* File,
+            BMP_INFO_t* Info)
+/*
+ * description: read the header of a bmp File, and store the data in the
+ * provided parameters
+ *
+ * parameters:
+ *         FilePtr: file, opened for reading
+ *         Magic:   output-parameter to store the read BMP_MAGIC_t structure
+ *         File:    output-parameter to store the read BMP_FILE_t structure
+ *         Info:    output-parameter to store the read BMP_INFO_t structure
+ *
+ * Note: caller should provide enough memory for parameters 'Magic', 'File' and
+ * 'Info'
+ */
+{
+    // to be implemented
+}
+
+
+// should be static in real life, but would give a compiling error in the
+// unchanged code because this function is not yet used
+static void WriteHdr(
+            FILE* FilePtr, BMP_MAGIC_t* Magic, BMP_FILE_t* File,
+            BMP_INFO_t* Info)
+/*
+ * description: write the header of a bmp File, where the data comes from the
+ * provided parameters
+ *
+ * parameters:
+ *         FilePtr: file, opened for writing
+ *         Magic:   input-parameter with a BMP_MAGIC_t structure
+ *         File:    input-parameter with a BMP_FILE_t structure
+ *         Info:    input-parameter with a BMP_INFO_t structure
+ *
+ */
+{
+    // to be implemented
+}
+
+
+extern void SteganoMultiplex(const char* File0, const char* File1)
+{
+    FILE* FilePtr0 = NULL;
+    FILE* FilePtr1 = NULL;
+    FILE* FilePtr2 = NULL;
+    char buf[MAX_FILENAME];
+
+    for (int NrBits = 0; NrBits <= 8; NrBits++)
+    {
+        // NrBits: number of bits for the hidden image
+        sprintf(buf, "mux_%s_%s_%d.bmp", File0, File1, NrBits);
+        FilePtr0 = fopen(File0, "rb");
+        FilePtr1 = fopen(File1, "rb");
+        FilePtr2 = fopen(buf, "wb");
+
+        // to be implemented
+
+
+        fclose(FilePtr0);
+        fclose(FilePtr1);
+        fclose(FilePtr2);
+    }
+}
+
+
+extern void SteganoMultiplexText(const char* File0, const char* File1)
+{
+    FILE* FilePtr0 = NULL;
+    FILE* FilePtr1 = NULL;
+    FILE* FilePtr2 = NULL;
+    char buf[MAX_FILENAME];
+
+    sprintf(buf, "mux_%s_%s.bmp", File0, File1);
+    FilePtr0 = fopen(File0, "rb");
+    FilePtr1 = fopen(File1, "rb");
+    FilePtr2 = fopen(buf, "wb");
+
+    // to be implemented
+
+
+    fclose(FilePtr0);
+    fclose(FilePtr1);
+    fclose(FilePtr2);
+}
+
+
+extern void
+SteganoDemultiplex(const char* File0, const char* File1, const char* File2)
+{
+    FILE* FilePtr0 = NULL;
+    FILE* FilePtr1 = NULL;
+    FILE* FilePtr2 = NULL;
+
+    FilePtr0 = fopen(File0, "rb");
+    FilePtr1 = fopen(File1, "wb");
+    FilePtr2 = fopen(File2, "wb");
+
+    // to be implemented
+
+
+    fclose(FilePtr0);
+    fclose(FilePtr1);
+    fclose(FilePtr2);
+}
+
+
+extern void
+SteganoDemultiplexText(const char* File0, const char* File1, const char* File2)
+{
+    FILE* FilePtr0 = NULL;
+    FILE* FilePtr1 = NULL;
+    FILE* FilePtr2 = NULL;
+
+    FilePtr0 = fopen(File0, "rb"); /* binair lezen */
+    FilePtr1 = fopen(File1, "wb"); /* binair schrijven */
+    FilePtr2 = fopen(File2, "wb"); /* binair schrijven */
+
+    // to be implemented
+
+
+    fclose(FilePtr0);
+    fclose(FilePtr1);
+    fclose(FilePtr2);
+}