C言語／C++/dumphdr - Sample is best!

開発環境	Microsoft Visual Studio Community 2017
実行環境	Windows 10 Home (64bit)
プロジェクトの種類	Visual C++
アプリケーションの種類	空のプロジェクト
プロジェクト名	dumphdr

dumphdr.cpp

// マルチバイト文字セット(MBCS)
 
#include <io.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
#define BYTE unsigned char
#define WORD unsigned short
 
char *exehdr[] = {
	"Magic number (MZ=5a4d)",
	"Bytes on last page of file",
	"Pages in file (1page=512bytes)",
	"Relocations",
	"Size of header in paragraphs (1para=16bytes)",
	"Minimum extra paragraphs needed",
	"Maximum extra paragraphs needed",
	"Initial (relative) SS value",
	"Initial SP value",
	"Checksum",
	"Initial IP value",
	"Initial (relative) CS value",
	"File address of relocation table",
	"Overlay number",
};
 
char *hdr = "address  00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 0123456789abcdef";
char *fmt = "                    -           -           -                            ";
 
int main(int argc, char *argv[])
{
	if (argc != 2) {
		fprintf(stderr, "usage: dumphdr filename\n");
		return 1;
	}
 
	FILE *pf;
	if (fopen_s(&pf, argv[1], "rb")) {
		fprintf(stderr, "%sのオープンに失敗しました。\n", argv[1]);
		return 1;
	}
 
	// メモリに読み込み
	long flen = _filelength(_fileno(pf));
	BYTE *data = (BYTE*)malloc(flen);
	fread(data, 1, flen, pf);
	fclose(pf);
 
	printf("_IMAGE_DOS_HEADER (winnt.h)\n");
	int pos = 0;
	for (int i = 0; i < _countof(exehdr); i++) {
		printf("%04x %04x %s\n", pos, *(WORD*)(data + pos), exehdr[i]);
		pos += 2;
	}
 
	// 16進ダンプ
	printf("\n%s\n\n", hdr);
	char line[80];
	char buf[9];
	for (int i = 0; i < flen; i += 16) {
		strcpy_s(line, fmt);
		sprintf_s(buf, "%08x", i);
		memcpy(line, buf, 8);
		int len = __min(flen - i, 16);
		for (int j = 0; j < len; j++) {
			BYTE c = data[i+j];
			sprintf_s(buf, "%02x", c);
			memcpy(line+9+3*j, buf, 2);
			if (c < 0x20 || 0x7e < c) c = '.';
			line[57+j] = c;
		}
		printf("%s\n", line);
	}
 
	free(data);
	return 0;
}