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7401b26824
Before: Ten builds, laptop -j5, no ccache: ``` real 0m36.686000-38.956000(38.608+/-0.65)s user 2m32.864000-42.253000(40.7545+/-2.7)s sys 0m16.618000-18.316000(17.8531+/-0.48)s ``` Ten builds, laptop -j5, ccache (warm): ``` real 0m8.212000-8.577000(8.39989+/-0.13)s user 0m12.731000-13.212000(12.9751+/-0.17)s sys 0m3.697000-3.902000(3.83722+/-0.064)s ``` After: Ten builds, laptop -j5, no ccache: 8% faster ``` real 0m33.802000-35.773000(35.468+/-0.54)s user 2m19.073000-27.754000(26.2542+/-2.3)s sys 0m15.784000-17.173000(16.7165+/-0.37)s ``` Ten builds, laptop -j5, ccache (warm): 1% faster ``` real 0m8.200000-8.485000(8.30138+/-0.097)s user 0m12.485000-13.100000(12.7344+/-0.19)s sys 0m3.702000-3.889000(3.78787+/-0.056)s ``` Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
/* Simple wrapper to create zlib or raw encodings of hex. */
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#include <bitcoin/short_channel_id.h>
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#include <ccan/err/err.h>
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#include <ccan/str/hex/hex.h>
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#include <common/decode_array.h>
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#include <stdio.h>
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#include <zlib.h>
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static NORETURN void usage(void)
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{
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errx(1, "Usage: mkencoded <encoding> <hexstr>, OR\n"
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"mkencoded --scids <encoding> <scid>...");
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}
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int main(int argc, char *argv[])
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{
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u8 encoding, *data;
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setup_locale();
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if (argv[1] && streq(argv[1], "--scids")) {
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argv++;
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argc--;
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if (argc < 2)
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usage();
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data = tal_arr(NULL, u8, 0);
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for (size_t i = 2; i < argc; i++) {
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struct short_channel_id scid;
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if (!short_channel_id_from_str(argv[i], strlen(argv[i]),
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&scid))
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errx(1, "Invalid short_channel_id %s", argv[i]);
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towire_short_channel_id(&data, &scid);
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}
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} else {
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data = tal_hexdata(NULL, argv[2], strlen(argv[2]));
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if (!data)
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errx(1, "Invalid hex string %s", argv[2]);
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}
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if (!hex_decode(argv[1], strlen(argv[1]), &encoding, sizeof(encoding)))
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errx(1, "Expected single hex byte not %s", argv[1]);
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if (encoding == ARR_UNCOMPRESSED)
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printf("%02x%s\n", encoding, tal_hex(NULL, data));
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else if (encoding == ARR_ZLIB) {
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/* https://www.zlib.net/zlib_tech.html:
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* the only expansion is an overhead of five bytes per 16 KB
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* block (about 0.03%), plus a one-time overhead of six bytes
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* for the entire stream.
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*/
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unsigned long compressed_len = tal_bytelen(data)
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+ 6 + 5*(tal_bytelen(data) + 16384)/16384;
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u8 *z = tal_arr(NULL, u8, compressed_len);
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if (compress2(z, &compressed_len, data, tal_bytelen(data),
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Z_DEFAULT_COMPRESSION) != Z_OK)
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errx(1, "Error compressing stream?");
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printf("%02x%s\n", encoding,
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tal_hexstr(NULL, z, compressed_len));
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} else {
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errx(1, "Unknown encoding %u", encoding);
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}
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return 0;
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}
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