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[base16] Add buffer size parameter to base16_encode() and base16_decode()

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The current API for Base16 (and Base64) encoding requires the caller
to always provide sufficient buffer space.  This prevents the use of
the generic encoding/decoding functionality in some situations, such
as in formatting the hex setting types.

Implement a generic hex_encode() (based on the existing
format_hex_setting()), implement base16_encode() and base16_decode()
in terms of the more generic hex_encode() and hex_decode(), and update
all callers to provide the additional buffer length parameter.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-04-24 14:34:32 +01:00
parent b56b482fa3
commit 9aa8090d06
12 changed files with 111 additions and 126 deletions
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38
src/core/settings.c
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@@ -2005,32 +2005,6 @@ const struct setting_type setting_type_uint16 __setting_type =
const struct setting_type setting_type_uint32 __setting_type =
SETTING_TYPE_UINT ( SETTING_TYPE_INT32 );
/**
* Format hex string setting value
*
* @v delimiter Byte delimiter
* @v raw Raw setting value
* @v raw_len Length of raw setting value
* @v buf Buffer to contain formatted value
* @v len Length of buffer
* @ret len Length of formatted value, or negative error
*/
static int format_hex_setting ( const char *delimiter, const void *raw,
size_t raw_len, char *buf, size_t len ) {
const uint8_t *bytes = raw;
int used = 0;
unsigned int i;
if ( len )
buf[0] = 0; /* Ensure that a terminating NUL exists */
for ( i = 0 ; i < raw_len ; i++ ) {
used += ssnprintf ( ( buf + used ), ( len - used ),
"%s%02x", ( used ? delimiter : "" ),
bytes[i] );
}
return used;
}
/**
* Parse hex string setting value (using colon delimiter)
*
@@ -2043,7 +2017,7 @@ static int format_hex_setting ( const char *delimiter, const void *raw,
*/
static int parse_hex_setting ( const struct setting_type *type __unused,
const char *value, void *buf, size_t len ) {
return hex_decode ( value, ':', buf, len );
return hex_decode ( ':', value, buf, len );
}
/**
@@ -2059,7 +2033,7 @@ static int parse_hex_setting ( const struct setting_type *type __unused,
static int format_hex_colon_setting ( const struct setting_type *type __unused,
const void *raw, size_t raw_len,
char *buf, size_t len ) {
return format_hex_setting ( ":", raw, raw_len, buf, len );
return hex_encode ( ':', raw, raw_len, buf, len );
}
/**
@@ -2075,7 +2049,7 @@ static int format_hex_colon_setting ( const struct setting_type *type __unused,
static int parse_hex_hyphen_setting ( const struct setting_type *type __unused,
const char *value, void *buf,
size_t len ) {
return hex_decode ( value, '-', buf, len );
return hex_decode ( '-', value, buf, len );
}
/**
@@ -2091,7 +2065,7 @@ static int parse_hex_hyphen_setting ( const struct setting_type *type __unused,
static int format_hex_hyphen_setting ( const struct setting_type *type __unused,
const void *raw, size_t raw_len,
char *buf, size_t len ) {
return format_hex_setting ( "-", raw, raw_len, buf, len );
return hex_encode ( '-', raw, raw_len, buf, len );
}
/**
@@ -2106,7 +2080,7 @@ static int format_hex_hyphen_setting ( const struct setting_type *type __unused,
*/
static int parse_hex_raw_setting ( const struct setting_type *type __unused,
const char *value, void *buf, size_t len ) {
return hex_decode ( value, 0, buf, len );
return hex_decode ( 0, value, buf, len );
}
/**
@@ -2122,7 +2096,7 @@ static int parse_hex_raw_setting ( const struct setting_type *type __unused,
static int format_hex_raw_setting ( const struct setting_type *type __unused,
const void *raw, size_t raw_len,
char *buf, size_t len ) {
return format_hex_setting ( "", raw, raw_len, buf, len );
return hex_encode ( 0, raw, raw_len, buf, len );
}
/** A hex-string setting (colon-delimited) */