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Fix and cleanup gt_{from,to}hex

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This commit is contained in:
angt
2015-12-13 11:26:58 +01:00
parent 6040f17e1c
commit ffa549e444
1 changed files with 11 additions and 8 deletions
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19
src/common.c
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@@ -41,17 +41,20 @@ void gt_na (const char *name)
int gt_tohex (char *dst, size_t dst_size, const uint8_t *src, size_t src_size)
{
if _0_(dst_size<2*src_size+1)
if _0_(!dst_size)
return -1;
const char tbl[] = "0123456789ABCDEF";
if _0_(((dst_size-1)/2)<src_size)
return -1;
static const char tbl[] = "0123456789ABCDEF";
for (size_t i=0; i<src_size; i++) {
dst[(i<<1)+0] = tbl[0xF&(src[i]>>4)];
dst[(i<<1)+1] = tbl[0xF&(src[i])];
*dst++ = tbl[0xF&(src[i]>>4)];
*dst++ = tbl[0xF&(src[i])];
}
dst[2*src_size] = 0;
*dst = 0;
return 0;
}
@@ -63,7 +66,7 @@ static inline int fromhex (const char c)
return c-'0';
if (c>='A' && c<='F')
return c-'a'+10;
return c-'A'+10;
return -1;
}
@@ -73,7 +76,7 @@ int gt_fromhex (uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
if _0_(src_size&1)
return -1;
if _0_(src_size>2*dst_size)
if _0_(dst_size<(src_size/2))
return -1;
for (size_t i=0; i<src_size; i+=2) {
@@ -83,7 +86,7 @@ int gt_fromhex (uint8_t *dst, size_t dst_size, const char *src, size_t src_size)
if _0_(a==-1 || b==-1)
return -1;
dst[i>>1] = (a<<4)|b;
*dst++ = (a<<4)|b;
}
return 0;