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Source.c
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Source.c
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#include <stdlib.h>
#include <stdio.h>
#include "BmpFile.h"
#define BMP_SIGNATURE 0x4d42
#define BMP_DATA_OFFSET_POSITION 0x0a
#define BMP_INFO_HEADER_VERSION 40
#define BMP_COMPRESSION_TYPE 0
#define READ_ONE_BYTE 1
int readBit(const int number, const int target) {
return number & (1 << target);
}
void readFromFileToBuffer(char const fileName[], BYTE** buffer) {
FILE* inputFile;
if (fopen_s(&inputFile, fileName, "r")) {
fprintf_s(stderr, "Can't open image\n");
exit(EXIT_FAILURE);
}
fread_s(&BmpFile.signature, sizeof(BmpFile.signature), READ_ONE_BYTE, sizeof(WORD), inputFile);
if (BmpFile.signature != BMP_SIGNATURE) {
fprintf_s(stderr, "Wrong image type\n");
exit(EXIT_FAILURE);
}
fseek(inputFile, BMP_DATA_OFFSET_POSITION, SEEK_SET);
fread_s(&BmpFile.dataOffset, sizeof(BmpFile.dataOffset), READ_ONE_BYTE, sizeof(DWORD), inputFile);
fread_s(&BmpFile.headerVersion, sizeof(BmpFile.headerVersion), READ_ONE_BYTE, sizeof(DWORD), inputFile);
if (BmpFile.headerVersion != BMP_INFO_HEADER_VERSION) {
fprintf_s(stderr, "Wrong bmp version\n");
exit(EXIT_FAILURE);
}
fread_s(&BmpFile.imgWidth, sizeof(BmpFile.imgWidth), READ_ONE_BYTE, sizeof(LONG), inputFile);
fread_s(&BmpFile.imgHeight, sizeof(BmpFile.imgHeight), READ_ONE_BYTE, sizeof(LONG), inputFile);
if (BmpFile.imgHeight >= 0) {
fprintf_s(stderr, "Wrong bmp row order\n");
exit(EXIT_FAILURE);
}
fseek(inputFile, sizeof(WORD), SEEK_CUR);
fread_s(&BmpFile.bitsInPixel, sizeof(BmpFile.bitsInPixel), READ_ONE_BYTE, sizeof(WORD), inputFile);
fread_s(&BmpFile.bitCompressionType, sizeof(BmpFile.bitCompressionType), READ_ONE_BYTE, sizeof(DWORD), inputFile);
if (BmpFile.bitCompressionType != BMP_COMPRESSION_TYPE) {
fprintf_s(stderr, "Wrong bmp compression type\n");
exit(EXIT_FAILURE);
}
fread_s(&BmpFile.bufferSize, sizeof(BmpFile.bufferSize), READ_ONE_BYTE, sizeof(DWORD), inputFile);
*buffer = (BYTE*)malloc(BmpFile.bufferSize * sizeof(BYTE));
fseek(inputFile, BmpFile.dataOffset, SEEK_SET);
fread_s(*buffer, BmpFile.bufferSize, READ_ONE_BYTE, BmpFile.bufferSize, inputFile);
fclose(inputFile);
}
void writeToFile(BYTE* buffer, char const fileName[]) {
char const fillSymbol = '#';
char const emptySymbol = ' ';
FILE* outputFile;
if (fileName) {
if (fopen_s(&outputFile, fileName, "w")) {
fprintf_s(stderr, "Can't open image\n");
exit(EXIT_FAILURE);
}
}
else
outputFile = stdout;
for (int i = 0; i < BmpFile.bufferSize; ++i) {
for (int j = 7; j >= 0; --j)
if (readBit(buffer[i], j))
fprintf_s(outputFile, "%c", fillSymbol);
else
fprintf_s(outputFile, "%c", emptySymbol);
if ((i + 1) % 4 == 0)
fprintf_s(outputFile, "\n");
}
fprintf_s(outputFile, "\n");
fclose(outputFile);
}
int main() {
char const imgName[] = "img.bmp";
BYTE* buff;
readFromFileToBuffer(imgName, &buff);
writeToFile(buff, NULL);
free(buff);
return EXIT_SUCCESS;
}