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gossipd: use default zlib compression, hack for zlib expansion.

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These both allow us to reproduce the test vectors in the next patch.  But
using Z_DEFAULT_COMPRESSION is a reasonable idea anyway.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-08-10 01:41:01 +09:30
parent f6cf4bf62a
commit 4de47f6db5
1 changed files with 6 additions and 2 deletions
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8
gossipd/gossipd.c
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@ -327,9 +327,13 @@ static u8 *zencode(const tal_t *ctx, const u8 *scids, size_t len)
int err;
unsigned long compressed_len = len;
#ifdef ZLIB_EVEN_IF_EXPANDS
/* Needed for test vectors */
compressed_len = 128 * 1024;
#endif
/* Prefer to fail if zlib makes it larger */
z = tal_arr(ctx, u8, len);
err = compress2(z, &compressed_len, scids, len, Z_BEST_COMPRESSION);
z = tal_arr(ctx, u8, compressed_len);
err = compress2(z, &compressed_len, scids, len, Z_DEFAULT_COMPRESSION);
if (err == Z_OK) {
status_trace("compressed %zu into %lu",
len, compressed_len);