CH_ALG_ZLIB
hdr->ch_algorithm = CH_ALG_ZLIB;
if (hdr->ch_algorithm != CH_ALG_ZLIB) {
srcfile, (uint64_t)hdr->ch_algorithm, CH_ALG_ZLIB);
hdr->ch_version != CH_VERSION || hdr->ch_algorithm != CH_ALG_ZLIB ||
hdr->ch_algorithm != CH_ALG_ZLIB || hdr->ch_fsize == 0 ||