1 files changed, 176 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..d353fbf
--- /dev/null
+++ b/main.c
@@ -0,0 +1,176 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+
+#define _HEADER_SIZE 54 //Fileheader + infoheader
+#define IDENTIFIER 0x424d //BM BitMap identifier
+
+//Address Definitions
+#define BF_TYPE           0x00
+#define BF_SIZE           0x02
+#define BF_OFF_BITS       0x0a
+#define BI_SIZE           0x0e
+#define BI_WIDTH          0x12
+#define BI_HEIGHT         0x16
+#define BI_BIT_COUNT      0x1c
+#define BI_COMPRESSION    0x1e
+#define BI_SIZE_IMAGE     0x22
+#define BI_CLR_USED       0x2e
+#define BI_CLR_IMPORTANT  0x32
+
+#define CHAR_SIZE 10 //How many pixels should form one ASCII char?
+
+const char map[] = {' ', '.', ',', '-', ':', ';', '!', '/','?' , '%', '$', '#'};
+
+struct ascii_pixel
+{
+  char i[3 * CHAR_SIZE][CHAR_SIZE]; //
+  char c;
+};
+
+//Routine for flipping bytes
+uint32_t flip(unsigned char* _v, int _c);
+
+//Calculate average
+char avg(int argc, char *argv);
+
+int main(int argc, char *argv[])
+{
+  unsigned char fileheader[_HEADER_SIZE];
+  unsigned char *tables;
+  uint32_t **bitmap_buff;
+  uint32_t read_counter = 0;
+
+  uint16_t bfType = 0;
+  uint32_t bfSize = 0;
+  uint32_t bfOffBits = 0;
+
+  uint32_t biSize = 0;
+  int32_t  biWidth = 0;
+  int32_t  biHeight = 0;
+  uint16_t biBitCount = 0;
+  uint32_t biCompression = 0;
+  uint32_t biSizeImage = 0;
+  uint32_t biClrUsed = 0;
+  uint32_t biClrImportant = 0;
+
+  if(argc < 2)
+  {
+    printf("No input file specified. Abort.\n");
+    return 1;
+  }
+
+  printf("Opening %s\n", argv[1]);
+
+  FILE *bitmap;
+  bitmap = fopen(argv[1], "r");
+
+  if(bitmap==NULL)
+  {
+    printf("Error opening file. Abort.\n");
+    return 1;
+  }
+
+  size_t tt = fread((void*)&fileheader, sizeof(char), _HEADER_SIZE, bitmap);
+  read_counter += _HEADER_SIZE;
+
+  if(!tt)
+  {
+    printf("Error reading file. Abort.\n");
+    return 1;
+  }
+
+  //Copy file header
+  bfType =          (uint16_t) flip(&fileheader[BF_TYPE], sizeof(bfType));
+
+  if(bfType != (uint16_t)IDENTIFIER)
+  {
+    printf("%s is not a valid Bitmap. Abort.\n", argv[1]);
+    fclose(bitmap);
+    return 1;
+  }
+
+  bfSize =          (uint32_t) flip(&fileheader[BF_SIZE], sizeof(bfSize));
+  bfOffBits =      *(uint32_t*) &fileheader[BF_OFF_BITS];
+  biSize =         *(uint32_t*) &fileheader[BI_SIZE];
+  biWidth =        *(int32_t*) &fileheader[BI_WIDTH];
+  biHeight =       *(int32_t*) &fileheader[BI_HEIGHT];
+  biBitCount =     *(uint16_t*) &fileheader[BI_BIT_COUNT];
+  biCompression =   (uint32_t) flip(&fileheader[BI_COMPRESSION], sizeof(biCompression));
+  biSizeImage =    *(uint32_t*) &fileheader[BI_SIZE_IMAGE];
+  biClrUsed =       (uint32_t) flip(&fileheader[BI_CLR_USED], sizeof(biClrUsed));
+  biClrImportant =  (uint32_t) flip(&fileheader[BI_CLR_IMPORTANT], sizeof(biClrImportant));
+
+  printf("Picture is %u x %u Pixels. Colordepth: %ubit. Size: %uB\n",biWidth, biHeight, biBitCount, biSizeImage);
+
+  if(biBitCount !=24)
+  {
+    printf("%ubit mode not supported.\n", biBitCount);
+    return 1;
+  }
+  if(biCompression != 0)
+  {
+    printf("Compression not supported.\n");
+    return 1;
+  }
+
+  //Read to start of Pixel block
+  //This block contains Colormasks and Colortables.
+  //Unused
+  uint32_t d = bfOffBits - read_counter;
+  tables = malloc(sizeof(char)* d);
+  fread(tables, sizeof(char), d, bitmap);
+
+  read_counter += d;
+  printf("Read to %x\n", read_counter);
+
+  uint32_t row_size = biWidth * 3; //One pixel is 3Byte, One line is multiple of 4Bytes
+  while(row_size%4)
+    row_size++;
+
+  printf("Set row reading size to %uB\n", row_size);
+  //If biHeight > 0 Data starts with last row!!
+
+  //Allocate 2D array
+  bitmap_buff = malloc(sizeof(*bitmap_buff) * biWidth);
+  for(int i = 0; i < biWidth; i++)
+  {
+    bitmap_buff[i] = malloc(sizeof(*bitmap_buff[i]) * biHeight);
+  }
+
+
+  for(int i = 0; i < biWidth; i++)
+    free(bitmap_buff[i]);
+  free(bitmap_buff);
+
+  fclose(bitmap);
+  return 0;
+}
+
+uint32_t flip(unsigned char* _v, int _c)
+{
+  uint32_t ret = 0;
+  uint32_t counter = (_c-1) * 8;
+
+  for(int i = 0; i < _c; i++)
+  {
+    ret |= (uint32_t)(_v[i] << (counter));
+    counter -= 8;
+  }
+
+  return ret;
+}//flip
+
+char avg(int argc, char *argv)
+{
+  char ret = 0;
+  uint64_t sum = 0;
+
+  for(int i = 0; i < argc; i++)
+    sum += (uint64_t)argv[i];
+
+  ret = (char)(sum / argc);
+
+  return ret;
+}//flip