mirror of
https://github.com/ElementsProject/lightning.git
synced 2024-12-27 09:04:40 +01:00
4ffda340d3
And turn "" includes into full-path (which makes it easier to put config.h first, and finds some cases check-includes.sh missed previously). config.h sets _GNU_SOURCE which really needs to be done before any '#includes': we mainly got away with it with glibc, but other platforms like Alpine may have stricter requirements. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
75 lines
1.2 KiB
C
75 lines
1.2 KiB
C
#include "config.h"
|
|
#include <bitcoin/varint.h>
|
|
|
|
size_t varint_size(varint_t v)
|
|
{
|
|
if (v < 0xfd)
|
|
return 1;
|
|
if (v <= 0xffff)
|
|
return 3;
|
|
if (v <= 0xffffffff)
|
|
return 5;
|
|
return 9;
|
|
}
|
|
|
|
size_t varint_put(u8 buf[VARINT_MAX_LEN], varint_t v)
|
|
{
|
|
u8 *p = buf;
|
|
|
|
if (v < 0xfd) {
|
|
*(p++) = v;
|
|
} else if (v <= 0xffff) {
|
|
(*p++) = 0xfd;
|
|
(*p++) = v;
|
|
(*p++) = v >> 8;
|
|
} else if (v <= 0xffffffff) {
|
|
(*p++) = 0xfe;
|
|
(*p++) = v;
|
|
(*p++) = v >> 8;
|
|
(*p++) = v >> 16;
|
|
(*p++) = v >> 24;
|
|
} else {
|
|
(*p++) = 0xff;
|
|
(*p++) = v;
|
|
(*p++) = v >> 8;
|
|
(*p++) = v >> 16;
|
|
(*p++) = v >> 24;
|
|
(*p++) = v >> 32;
|
|
(*p++) = v >> 40;
|
|
(*p++) = v >> 48;
|
|
(*p++) = v >> 56;
|
|
}
|
|
return p - buf;
|
|
}
|
|
|
|
size_t varint_get(const u8 *p, size_t max, varint_t *val)
|
|
{
|
|
if (max < 1)
|
|
return 0;
|
|
|
|
switch (*p) {
|
|
case 0xfd:
|
|
if (max < 3)
|
|
return 0;
|
|
*val = ((u64)p[2] << 8) + p[1];
|
|
return 3;
|
|
case 0xfe:
|
|
if (max < 5)
|
|
return 0;
|
|
*val = ((u64)p[4] << 24) + ((u64)p[3] << 16)
|
|
+ ((u64)p[2] << 8) + p[1];
|
|
return 5;
|
|
case 0xff:
|
|
if (max < 9)
|
|
return 0;
|
|
*val = ((u64)p[8] << 56) + ((u64)p[7] << 48)
|
|
+ ((u64)p[6] << 40) + ((u64)p[5] << 32)
|
|
+ ((u64)p[4] << 24) + ((u64)p[3] << 16)
|
|
+ ((u64)p[2] << 8) + p[1];
|
|
return 9;
|
|
default:
|
|
*val = *p;
|
|
return 1;
|
|
}
|
|
}
|