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#include <stdio.h>
#include <stdint.h>
#include <err.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
typedef union modrm_byte_t modrm_byte_t;
union modrm_byte_t
{
uint8_t byte;
struct
{
uint8_t rm:3;
uint8_t reg:3;
uint8_t mod:2;
};
};
typedef union sib_byte_t sib_byte_t;
union sib_byte_t
{
uint8_t byte;
struct
{
uint8_t base:3;
uint8_t index:3;
uint8_t ss:2;
};
};
typedef union mdisass_buffer_t mdisass_buffer_t;
union mdisass_buffer_t
{
union
{
uint8_t byte;
uint8_t prefix;
uint8_t opcode;
};
modrm_byte_t modrm_byte;
sib_byte_t sib_byte;
};
typedef struct mdisass_data_t mdisass_data_t;
struct mdisass_data_t
{
size_t size;
mdisass_buffer_t *buffer;
};
void set_buffer_from_file(mdisass_data_t *data, char *filename);
int main(int argc, char *argv[])
{
mdisass_data_t *data = NULL;
if (argc != 2)
errx(EXIT_FAILURE, "usage: %s ./file.bin", argv[0]);
if ((data = calloc(sizeof(mdisass_data_t), 1)) == NULL)
{
errx(EXIT_FAILURE, "calloc(sizeof(mdisass_data_t), 1");
}
set_buffer_from_file(data, argv[1]);
printf("\n*** START DEBUG ***\n");
printf("in main()\n");
printf("data->size: %lu\n", data->size);
for (size_t i = 0; i < data->size; i++)
printf("mdisass_buffer[%lu].byte = 0x%.2x ", i, data->buffer[i].byte);
printf("\n*** END DEBUG ***\n");
printf("\n*** START DEBUG ***\n");
data->buffer[0].byte = 0x10;
printf("mdisass_buffer[0].modrm_byte.byte = 0x%.2x\n", data->buffer[0].modrm_byte.byte);
printf("mdisass_buffer[0].modrm_byte.rm = 0x%.2x\n", data->buffer[0].modrm_byte.rm);
printf("mdisass_buffer[0].modrm_byte.reg = 0x%.2x\n", data->buffer[0].modrm_byte.reg);
printf("mdisass_buffer[0].modrm_byte.mod = 0x%.2x\n", data->buffer[0].modrm_byte.mod);
printf("*** END DEBUG ***\n");
free(data->buffer);
return 0;
}
void set_buffer_from_file(mdisass_data_t *data, char *filename)
{
const size_t CHUNK_SIZE = 128;
FILE *f = NULL;
size_t size = CHUNK_SIZE, read = 0, ret = 0;
uint8_t *bytes = NULL;
if ((f = fopen(filename, "rb")) == NULL)
{
fclose(f);
errx(EXIT_FAILURE, "fopen(%s) : %s", filename, strerror(errno));
}
if ((bytes = malloc(sizeof(uint8_t) * size)) == NULL)
{
fclose(f);
errx(EXIT_FAILURE, "malloc(sizeof(uint8_t) * %lu) : %s", size, strerror(errno));
}
while ((ret = fread(&bytes[read], sizeof(uint8_t), CHUNK_SIZE, f)) != 0)
{
read += ret;
size += CHUNK_SIZE;
bytes = realloc(bytes, sizeof(uint8_t) * size);
if (bytes == NULL)
{
fclose(f);
errx(EXIT_FAILURE, "realloc(sizeof(uint8_t) * %lu) : %s", size, strerror(errno));
}
}
if (ferror(f) != 0)
{
fclose(f);
errx(EXIT_FAILURE, "ferror(%s) : %s", filename, strerror(errno));
}
fclose(f);
printf("*** START DEBUG ***\n");
printf("in set_buffer_from_file()\n");
printf("read: %lu\n", read);
for (int i = 0; i < read; i++) printf("0x%.2x ", bytes[i]);
printf("\n*** END DEBUG ***\n");
data->size = read;
data->buffer = (mdisass_buffer_t *)bytes;
}
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