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devtools/mkencoded: tool to encode short_channel_id / other for testing

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In particular, it does zlib.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2019-09-12 09:54:01 +09:30
parent 8ef996d56e
commit f4e7ed179f
3 changed files with 70 additions and 1 deletions
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1
devtools/.gitignore vendored
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@ -7,3 +7,4 @@ mkcommit
mkfunding
mkclose
mkgossip
mkencoded

4
devtools/Makefile
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@ -1,6 +1,6 @@
DEVTOOLS_SRC := devtools/gen_print_wire.c devtools/gen_print_onion_wire.c devtools/print_wire.c
DEVTOOLS_OBJS := $(DEVTOOLS_SRC:.c=.o)
DEVTOOLS := devtools/bolt11-cli devtools/decodemsg devtools/onion devtools/dump-gossipstore devtools/gossipwith devtools/create-gossipstore devtools/mkcommit devtools/mkfunding devtools/mkclose devtools/mkgossip
DEVTOOLS := devtools/bolt11-cli devtools/decodemsg devtools/onion devtools/dump-gossipstore devtools/gossipwith devtools/create-gossipstore devtools/mkcommit devtools/mkfunding devtools/mkclose devtools/mkgossip devtools/mkencoded
DEVTOOLS_TOOL_SRC := $(DEVTOOLS:=.c)
DEVTOOLS_TOOL_OBJS := $(DEVTOOLS_TOOL_SRC:.c=.o)
@ -74,6 +74,8 @@ devtools/mkclose: $(DEVTOOLS_COMMON_OBJS) $(CCAN_OBJS) $(BITCOIN_OBJS) wire/from
devtools/mkgossip: $(DEVTOOLS_COMMON_OBJS) $(CCAN_OBJS) $(BITCOIN_OBJS) wire/fromwire.o wire/towire.o wire/tlvstream.o common/funding_tx.o common/utxo.o common/permute_tx.o common/key_derive.o devtools/mkgossip.o
devtools/mkencoded: $(DEVTOOLS_COMMON_OBJS) $(CCAN_OBJS) $(BITCOIN_OBJS) wire/fromwire.o wire/towire.o wire/tlvstream.o devtools/mkencoded.o
# Make sure these depend on everything.
ALL_PROGRAMS += $(DEVTOOLS)
ALL_OBJS += $(DEVTOOLS_OBJS) $(DEVTOOLS_TOOL_OBJS)

66
devtools/mkencoded.c Normal file
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@ -0,0 +1,66 @@
/* Simple wrapper to create zlib or raw encodings of hex. */
#include <bitcoin/short_channel_id.h>
#include <ccan/err/err.h>
#include <ccan/str/hex/hex.h>
#include <common/decode_short_channel_ids.h>
#include <common/utils.h>
#include <stdio.h>
#include <wire/wire.h>
#include <zlib.h>
static NORETURN void usage(void)
{
errx(1, "Usage: mkencoded <encoding> <hexstr>, OR\n"
"mkencoded --scids <encoding> <scid>...");
}
int main(int argc, char *argv[])
{
u8 encoding, *data;
setup_locale();
if (argv[1] && streq(argv[1], "--scids")) {
argv++;
argc--;
if (argc < 2)
usage();
data = tal_arr(NULL, u8, 0);
for (size_t i = 2; i < argc; i++) {
struct short_channel_id scid;
if (!short_channel_id_from_str(argv[i], strlen(argv[i]),
&scid))
errx(1, "Invalid short_channel_id %s", argv[i]);
towire_short_channel_id(&data, &scid);
}
} else {
data = tal_hexdata(NULL, argv[2], strlen(argv[2]));
if (!data)
errx(1, "Invalid hex string %s", argv[2]);
}
if (!hex_decode(argv[1], strlen(argv[1]), &encoding, sizeof(encoding)))
errx(1, "Expected single hex byte not %s", argv[1]);
if (encoding == SHORTIDS_UNCOMPRESSED)
printf("%02x%s\n", encoding, tal_hex(NULL, data));
else if (encoding == SHORTIDS_ZLIB) {
/* https://www.zlib.net/zlib_tech.html:
* the only expansion is an overhead of five bytes per 16 KB
* block (about 0.03%), plus a one-time overhead of six bytes
* for the entire stream.
*/
unsigned long compressed_len = tal_bytelen(data)
+ 6 + 5*(tal_bytelen(data) + 16384)/16384;
u8 *z = tal_arr(NULL, u8, compressed_len);
if (compress2(z, &compressed_len, data, tal_bytelen(data),
Z_DEFAULT_COMPRESSION) != Z_OK)
errx(1, "Error compressing stream?");
printf("%02x%s\n", encoding,
tal_hexstr(NULL, z, compressed_len));
} else {
errx(1, "Unknown encoding %u", encoding);
}
return 0;
}