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/* Copyright 2011 The ChromiumOS Authors
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*
* Host functions for verified boot.
*/
/* TODO: change all 'return 0', 'return 1' into meaningful return codes */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "host_common.h"
char* StrCopy(char* dest, const char* src, int dest_size)
{
strncpy(dest, src, dest_size);
dest[dest_size - 1] = '\0';
return dest;
}
uint8_t* ReadFile(const char* filename, uint64_t* sizeptr)
{
FILE* f;
uint8_t* buf;
long size;
f = fopen(filename, "rb");
if (!f) {
fprintf(stderr, "Unable to open file %s\n", filename);
return NULL;
}
fseek(f, 0, SEEK_END);
size = ftell(f);
if (size < 0) {
fclose(f);
return NULL;
}
rewind(f);
buf = malloc(size);
if (!buf) {
fclose(f);
return NULL;
}
if(1 != fread(buf, size, 1, f)) {
fprintf(stderr, "Unable to read from file %s\n", filename);
fclose(f);
free(buf);
return NULL;
}
fclose(f);
if (sizeptr)
*sizeptr = size;
return buf;
}
char* ReadFileString(char* dest, int size, const char* filename)
{
char* got;
FILE* f;
f = fopen(filename, "rt");
if (!f)
return NULL;
got = fgets(dest, size, f);
fclose(f);
return got;
}
int ReadFileInt(const char* filename, unsigned* value)
{
char buf[64];
char* e = NULL;
if (!ReadFileString(buf, sizeof(buf), filename))
return -1;
/* Convert to integer. Allow characters after the int ("123 blah"). */
*value = (unsigned)strtoul(buf, &e, 0);
if (e == buf)
return -1; /* No characters consumed, so conversion failed */
return 0;
}
int ReadFileBit(const char* filename, int bitmask)
{
unsigned value;
if (ReadFileInt(filename, &value) < 0)
return -1;
else return (value & bitmask ? 1 : 0);
}
vb2_error_t WriteFile(const char* filename, const void *data, uint64_t size)
{
FILE *f = fopen(filename, "wb");
if (!f) {
fprintf(stderr, "Unable to open file %s\n", filename);
return 1;
}
if (1 != fwrite(data, size, 1, f)) {
fprintf(stderr, "Unable to write to file %s\n", filename);
fclose(f);
unlink(filename); /* Delete any partial file */
return 1;
}
fclose(f);
return 0;
}
bool parse_hex(uint8_t *val, const char *str)
{
uint8_t v = 0;
char c;
int digit;
for (digit = 0; digit < 2; digit++) {
c = *str;
if (!c)
return false;
if (!isxdigit(c))
return false;
c = tolower(c);
if (c >= '0' && c <= '9')
v += c - '0';
else
v += 10 + c - 'a';
if (!digit)
v <<= 4;
str++;
}
*val = v;
return true;
}
bool parse_hash(uint8_t *buf, size_t len, const char *str)
{
const char *s = str;
int i;
for (i = 0; i < len; i++) {
/* skip whitespace */
while (*s && isspace(*s))
s++;
if (!*s)
break;
if (!parse_hex(buf, s))
break;
/* on to the next byte */
s += 2;
buf++;
}
if (i != len || *s)
return false;
return true;
}
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