mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-11-19 18:11:28 +01:00
93d04d08d0
The main change here is that the previously-optional open/accept fields and reestablish fields are now compulsory (everyone was including them anyway). In fact, the open/accept is a TLV because it was actually the same format. For more details, see lightning-rfc/f068dd0d8dfa5ae75feedd99f269e23be4777381 Changelog-Removed: protocol: support for optioned form of reestablish messages now compulsory. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
125 lines
2.2 KiB
C
125 lines
2.2 KiB
C
#include <assert.h>
|
|
#include <common/bigsize.h>
|
|
#include <wire/wire.h>
|
|
|
|
#ifndef SUPERVERBOSE
|
|
#define SUPERVERBOSE(...)
|
|
#endif
|
|
|
|
size_t bigsize_len(bigsize_t v)
|
|
{
|
|
if (v < 0xfd) {
|
|
return 1;
|
|
} else if (v <= 0xffff) {
|
|
return 3;
|
|
} else if (v <= 0xffffffff) {
|
|
return 5;
|
|
} else {
|
|
return 9;
|
|
}
|
|
}
|
|
|
|
size_t bigsize_put(u8 buf[BIGSIZE_MAX_LEN], bigsize_t v)
|
|
{
|
|
u8 *p = buf;
|
|
|
|
if (v < 0xfd) {
|
|
*(p++) = v;
|
|
} else if (v <= 0xffff) {
|
|
(*p++) = 0xfd;
|
|
(*p++) = v >> 8;
|
|
(*p++) = v;
|
|
} else if (v <= 0xffffffff) {
|
|
(*p++) = 0xfe;
|
|
(*p++) = v >> 24;
|
|
(*p++) = v >> 16;
|
|
(*p++) = v >> 8;
|
|
(*p++) = v;
|
|
} else {
|
|
(*p++) = 0xff;
|
|
(*p++) = v >> 56;
|
|
(*p++) = v >> 48;
|
|
(*p++) = v >> 40;
|
|
(*p++) = v >> 32;
|
|
(*p++) = v >> 24;
|
|
(*p++) = v >> 16;
|
|
(*p++) = v >> 8;
|
|
(*p++) = v;
|
|
}
|
|
return p - buf;
|
|
}
|
|
|
|
size_t bigsize_get(const u8 *p, size_t max, bigsize_t *val)
|
|
{
|
|
if (max < 1) {
|
|
SUPERVERBOSE("EOF");
|
|
return 0;
|
|
}
|
|
|
|
switch (*p) {
|
|
case 0xfd:
|
|
if (max < 3) {
|
|
SUPERVERBOSE("unexpected EOF");
|
|
return 0;
|
|
}
|
|
*val = ((u64)p[1] << 8) + p[2];
|
|
if (*val < 0xfd) {
|
|
SUPERVERBOSE("decoded bigsize is not canonical");
|
|
return 0;
|
|
}
|
|
return 3;
|
|
case 0xfe:
|
|
if (max < 5) {
|
|
SUPERVERBOSE("unexpected EOF");
|
|
return 0;
|
|
}
|
|
*val = ((u64)p[1] << 24) + ((u64)p[2] << 16)
|
|
+ ((u64)p[3] << 8) + p[4];
|
|
if ((*val >> 16) == 0) {
|
|
SUPERVERBOSE("decoded bigsize is not canonical");
|
|
return 0;
|
|
}
|
|
return 5;
|
|
case 0xff:
|
|
if (max < 9) {
|
|
SUPERVERBOSE("unexpected EOF");
|
|
return 0;
|
|
}
|
|
*val = ((u64)p[1] << 56) + ((u64)p[2] << 48)
|
|
+ ((u64)p[3] << 40) + ((u64)p[4] << 32)
|
|
+ ((u64)p[5] << 24) + ((u64)p[6] << 16)
|
|
+ ((u64)p[7] << 8) + p[8];
|
|
if ((*val >> 32) == 0) {
|
|
SUPERVERBOSE("decoded bigsize is not canonical");
|
|
return 0;
|
|
}
|
|
return 9;
|
|
default:
|
|
*val = *p;
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
bigsize_t fromwire_bigsize(const u8 **cursor, size_t *max)
|
|
{
|
|
bigsize_t v;
|
|
size_t len = bigsize_get(*cursor, *max, &v);
|
|
|
|
if (len == 0) {
|
|
fromwire_fail(cursor, max);
|
|
return 0;
|
|
}
|
|
assert(len <= *max);
|
|
fromwire(cursor, max, NULL, len);
|
|
return v;
|
|
}
|
|
|
|
void towire_bigsize(u8 **pptr, const bigsize_t val)
|
|
{
|
|
u8 buf[BIGSIZE_MAX_LEN];
|
|
size_t len;
|
|
|
|
len = bigsize_put(buf, val);
|
|
towire(pptr, buf, len);
|
|
}
|