1 files changed, 112 insertions, 0 deletions

diff --git a/SD-VBS/common/c/readImage.c b/SD-VBS/common/c/readImage.c
new file mode 100644
index 0000000..a4dd990
--- /dev/null
+++ b/SD-VBS/common/c/readImage.c
@@ -0,0 +1,112 @@
+/********************************
+Author: Sravanthi Kota Venkata
+********************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "sdvbs_common.h"
+
+I2D* readImage(const char* pathName)
+{
+    // Reading BMP image
+    char signature[2];   
+    int file_size;
+    short int reserved1;
+    short int reserved2;
+    int loc_of_bitmap;
+
+    int size_of_infoheader;
+    int width;
+    int height;
+    short int number_of_planes;
+    short int bits_per_pixel;
+
+    int compression_method;
+    int bytes_of_bitmap;
+    int hori_reso;
+    int vert_reso;
+    int no_of_colors;
+    int no_of_imp_colors;
+
+    int nI,nJ;
+    int pixSize;
+
+    unsigned char tempb,tempg,tempr,tempjunk[12];
+    int ta;
+    I2D* srcImage;
+
+    FILE *input;
+    input = fopen(pathName,"rb");
+    if(input == NULL)
+    {
+        perror("File pointer error");
+        return NULL;
+    }
+    else
+    {
+        //start of header information
+        fread(&signature,sizeof(signature),1,input);
+        fread(&file_size,sizeof(file_size),1,input);
+        fread(&reserved1,sizeof(reserved1),1,input);
+        fread(&reserved2,sizeof(reserved2),1,input);
+        fread(&loc_of_bitmap,sizeof(loc_of_bitmap),1,input);
+
+        fread(&size_of_infoheader,sizeof(size_of_infoheader),1,input);
+        fread(&width,sizeof(width),1,input); // Reads the width of the image
+        fread(&height,sizeof(height),1,input); // Reads the height of the image
+        fread(&number_of_planes,sizeof(number_of_planes),1,input);
+        fread(&bits_per_pixel,sizeof(bits_per_pixel),1,input);
+        fread(&compression_method,sizeof(compression_method),1,input);
+        fread(&bytes_of_bitmap,sizeof(bytes_of_bitmap),1,input);
+
+        fread(&hori_reso,sizeof(hori_reso),1,input);
+        fread(&vert_reso,sizeof(vert_reso),1,input);
+        fread(&no_of_colors,sizeof(no_of_colors),1,input);
+        fread(&no_of_imp_colors,sizeof(no_of_imp_colors),1,input);
+        //end of header information
+
+        srcImage = iMallocHandle(height, width);
+        
+        // Conditions to check whether the BMP is interleaved and handling few exceptions
+        if(srcImage->height <= 0 || srcImage->width <= 0 || signature[0] != 'B' || signature[1] != 'M'  || ( bits_per_pixel !=24 && bits_per_pixel !=8 ) )
+        {
+            printf("ERROR in BMP read: The input file is not in standard BMP format");
+            return NULL;
+        }
+        fseek(input,loc_of_bitmap,SEEK_SET);
+
+        if (bits_per_pixel == 8)
+        {
+            for(nI = (height - 1); nI >= 0 ; nI--)
+            {
+                for(nJ = 0;nJ < width; nJ++)
+                {
+                    fread(&tempg,sizeof(unsigned char),1,input);
+                    subsref(srcImage,nI,nJ) = (int)tempg;
+                }
+            }
+        }
+        else if (bits_per_pixel == 24)
+        {
+            for(nI = (height - 1); nI >= 0 ; nI--)
+            {
+                for(nJ = 0;nJ < width; nJ++)
+                {
+                    fread(&tempb,sizeof(unsigned char),1,input);
+                    fread(&tempg,sizeof(unsigned char),1,input);
+                    fread(&tempr,sizeof(unsigned char),1,input);
+                    ta = (3*tempr + 6*tempg + tempb)/10;
+                    ta = tempg;
+                    subsref(srcImage,nI,nJ) = (int)ta;
+                }
+            }
+        }
+        else
+        {
+            return NULL;
+        }
+
+        fclose(input);
+        return srcImage;
+    }
+}