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#include "utils.h"
#include "wire.h"
#include <bitcoin/pubkey.h>
#include <ccan/endian/endian.h>
#include <ccan/mem/mem.h>
/* Sets *cursor to NULL and returns NULL when extraction fails. */
static const void *fail_pull(const u8 **cursor, size_t *max)
{
*cursor = NULL;
*max = 0;
return NULL;
}
const u8 *fromwire(const u8 **cursor, size_t *max, void *copy, size_t n)
{
const u8 *p = *cursor;
if (*max < n) {
/* Just make sure we don't leak uninitialized mem! */
if (copy)
memset(copy, 0, n);
return fail_pull(cursor, max);
}
*cursor += n;
*max -= n;
if (copy)
memcpy(copy, p, n);
return memcheck(p, n);
}
int fromwire_peektype(const u8 *cursor)
{
be16 be_type;
size_t max = tal_count(cursor);
fromwire(&cursor, &max, &be_type, sizeof(be_type));
if (!cursor)
return -1;
return be16_to_cpu(be_type);
}
u8 fromwire_u8(const u8 **cursor, size_t *max)
{
u8 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return ret;
}
u16 fromwire_u16(const u8 **cursor, size_t *max)
{
be16 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return be16_to_cpu(ret);
}
u32 fromwire_u32(const u8 **cursor, size_t *max)
{
be32 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return be32_to_cpu(ret);
}
u64 fromwire_u64(const u8 **cursor, size_t *max)
{
be64 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return 0;
return be64_to_cpu(ret);
}
bool fromwire_bool(const u8 **cursor, size_t *max)
{
u8 ret;
if (!fromwire(cursor, max, &ret, sizeof(ret)))
return false;
if (ret != 0 && ret != 1)
fail_pull(cursor, max);
return ret;
}
void fromwire_pubkey(const u8 **cursor, size_t *max, struct pubkey *pubkey)
{
u8 der[PUBKEY_DER_LEN];
if (!fromwire(cursor, max, der, sizeof(der)))
return;
if (!pubkey_from_der(der, sizeof(der), pubkey))
fail_pull(cursor, max);
}
void fromwire_signature(const u8 **cursor, size_t *max, struct signature *sig)
{
u8 compact[64];
if (!fromwire(cursor, max, compact, sizeof(compact)))
return;
if (secp256k1_ecdsa_signature_parse_compact(secp256k1_ctx,
&sig->sig, compact)
!= 1)
fail_pull(cursor, max);
}
void fromwire_channel_id(const u8 **cursor, size_t *max,
struct channel_id *channel_id)
{
be32 txnum = 0;
u8 outnum;
channel_id->blocknum = fromwire_u32(cursor, max);
/* Pulling 3 bytes off wire is tricky; they're big-endian. */
fromwire(cursor, max, (char *)&txnum + 1, 3);
channel_id->txnum = be32_to_cpu(txnum);
fromwire(cursor, max, &outnum, 1);
channel_id->outnum = outnum;
}
void fromwire_sha256(const u8 **cursor, size_t *max, struct sha256 *sha256)
{
fromwire(cursor, max, sha256, sizeof(*sha256));
}
void fromwire_ipv6(const u8 **cursor, size_t *max, struct ipv6 *ipv6)
{
fromwire(cursor, max, ipv6, sizeof(*ipv6));
}
void fromwire_u8_array(const u8 **cursor, size_t *max, u8 *arr, size_t num)
{
fromwire(cursor, max, arr, num);
}
void fromwire_pad(const u8 **cursor, size_t *max, size_t num)
{
fromwire(cursor, max, NULL, num);
}
void fromwire_signature_array(const u8 **cursor, size_t *max,
struct signature *arr, size_t num)
{
size_t i;
for (i = 0; i < num; i++)
fromwire_signature(cursor, max, arr + i);
}