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wire: add var_int parsing functions

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so we can put and pull bitcoin 'var_int' length types from the
wire.

for more info on variable integers, see http://learnmeabitcoin.com/glossary/varint
This commit is contained in:
lisa neigut 2019-04-02 17:18:06 -07:00 • committed by Rusty Russell
parent 1213f44071
commit 74ae9f09ac
3 changed files with 39 additions and 0 deletions
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21
wire/fromwire.c
View file

@ -101,6 +101,27 @@ bool fromwire_bool(const u8 **cursor, size_t *max)
return ret;
}
u64 fromwire_var_int(const u8 **cursor, size_t *max)
{
if (*max < 1) {
fromwire_fail(cursor, max);
return 0;
}
u8 flag = fromwire_u8(cursor, max);
switch(flag) {
case 0xff:
return fromwire_u64(cursor, max);
case 0xfe:
return (u64)fromwire_u32(cursor, max);
case 0xfd:
return (u64)fromwire_u16(cursor, max);
default:
return (u64)flag;
}
}
void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey)
{
u8 der[PUBKEY_DER_LEN];

16
wire/towire.c
View file

@ -54,6 +54,22 @@ void towire_bool(u8 **pptr, bool v)
towire(pptr, &val, sizeof(val));
}
void towire_var_int(u8 **pptr, const u64 val)
{
if (val < 0xfd) {
towire_u8(pptr, (u8)val);
} else if (val <= 0xffff) {
towire_u8(pptr, 0xfd);
towire_u16(pptr, (u16)val);
} else if (val <= 0xffffffff) {
towire_u8(pptr, 0xfe);
towire_u32(pptr, (u32)val);
} else {
towire_u8(pptr, 0xff);
towire_u64(pptr, val);
}
}
void towire_pubkey(u8 **pptr, const struct pubkey *pubkey)
{
u8 output[PUBKEY_DER_LEN];

2
wire/wire.h
View file

@ -67,6 +67,7 @@ void towire_u64(u8 **pptr, u64 v);
void towire_double(u8 **pptr, const double *v);
void towire_pad(u8 **pptr, size_t num);
void towire_bool(u8 **pptr, bool v);
void towire_var_int(u8 **pptr, const u64 val);
void towire_u8_array(u8 **pptr, const u8 *arr, size_t num);
@ -83,6 +84,7 @@ u32 fromwire_u32(const u8 **cursor, size_t *max);
u64 fromwire_u64(const u8 **cursor, size_t *max);
void fromwire_double(const u8 **cursor, size_t *max, double *v);
bool fromwire_bool(const u8 **cursor, size_t *max);
u64 fromwire_var_int(const u8 **cursor, size_t *max);
void fromwire_secret(const u8 **cursor, size_t *max, struct secret *secret);
void fromwire_privkey(const u8 **cursor, size_t *max, struct privkey *privkey);
void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey);