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#include <ccan/crc/crc.h>
#include <ccan/endian/endian.h>
#include <common/gossip_store.h>
#include <common/status.h>
#include <errno.h>
#include <inttypes.h>
#include <unistd.h>
u8 *gossip_store_read(const tal_t *ctx, int gossip_store_fd, u64 offset)
{
beint32_t hdr[2];
u32 msglen, checksum;
u8 *msg;
if (offset == 0)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't access offset %"PRIu64,
offset);
if (pread(gossip_store_fd, hdr, sizeof(hdr), offset) != sizeof(hdr)) {
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't read hdr offset %"PRIu64
": %s",
offset, strerror(errno));
}
msglen = be32_to_cpu(hdr[0]);
checksum = be32_to_cpu(hdr[1]);
msg = tal_arr(ctx, u8, msglen);
if (pread(gossip_store_fd, msg, msglen, offset + sizeof(hdr)) != msglen)
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: can't read len %u offset %"PRIu64,
msglen, offset);
if (checksum != crc32c(0, msg, msglen))
status_failed(STATUS_FAIL_INTERNAL_ERROR,
"gossip_store: bad checksum offset %"PRIu64,
offset);
return msg;
}