misc.c

#include <misc.h>

uint64_t file_save(const char * filename, void * buf, uint64_t len)
{
	FILE * out;
	int r;

	if(strcmp(filename, "-") == 0)
		out = stdout;
	else
		out = fopen(filename, "wb");
	if(!out)
	{
		perror("Failed to open output file");
		exit(-1);
	}
	r = fwrite(buf, len, 1, out);
	if(out != stdout)
		fclose(out);
	return r;
}

void * file_load(const char * filename, uint64_t * len)
{
	uint64_t offset = 0, bufsize = 8192;
	char * buf = malloc(bufsize);
	FILE * in;
	if(strcmp(filename, "-") == 0)
		in = stdin;
	else
		in = fopen(filename, "rb");
	if(!in)
	{
		perror("Failed to open input file");
		exit(-1);
	}
	while(1)
	{
		uint64_t len = bufsize - offset;
		uint64_t n = fread(buf + offset, 1, len, in);
		offset += n;
		if(n < len)
			break;
		bufsize *= 2;
		buf = realloc(buf, bufsize);
		if(!buf)
		{
			perror("Failed to resize load_file() buffer");
			exit(-1);
		}
	}
	if(len)
		*len = offset;
	if(in != stdin)
		fclose(in);
	return buf;
}

static inline unsigned char hex_to_bin(char c)
{
	if((c >= 'a') && (c <= 'f'))
		return c - 'a' + 10;
	if((c >= '0') && (c <= '9'))
		return c - '0';
	if((c >= 'A') && (c <= 'F'))
		return c - 'A' + 10;
	return 0;
}

unsigned char hex_string(const char * s, int o)
{
	return (hex_to_bin(s[o]) << 4) | hex_to_bin(s[o + 1]);
}

void hexdump(uint32_t addr, void * buf, size_t len)
{
	unsigned char * p = buf;
	size_t i, j;

	for(j = 0; j < len; j += 16)
	{
		printf("%08x: ", (uint32_t)(addr + j));
		for(i = 0; i < 16; i++)
		{
			if(j + i < len)
				printf("%02x ", p[j + i]);
			else
				printf("   ");
		}
		putchar(' ');
		for(i = 0; i < 16; i++)
		{
			if(j + i >= len)
				putchar(' ');
			else
				putchar(isprint(p[j + i]) ? p[j + i] : '.');
		}
		printf("\r\n");
	}
}