Line data    Source code

       1             : #ifndef HEADER_fd_src_app_fddev_genesis_hash_h
       2             : #define HEADER_fd_src_app_fddev_genesis_hash_h
       3             : 
       4             : #include "../../../../ballet/sha256/fd_sha256.h"
       5             : 
       6             : #include <errno.h>
       7             : #include <stdio.h>
       8             : 
       9             : static inline ushort
      10             : compute_shred_version( char const * genesis_path,
      11           0 :                        uchar      * opt_gen_hash  ) {
      12             :   /* Compute the shred version and the genesis hash */
      13           0 :   fd_sha256_t _sha[ 1 ];  fd_sha256_t * sha = fd_sha256_join( fd_sha256_new( _sha ) );
      14           0 :   fd_sha256_init( sha );
      15           0 :   uchar buffer[ 4096 ];
      16             : 
      17           0 :   FILE * genesis_file = fopen( genesis_path, "r" );
      18           0 :   if( FD_UNLIKELY( !genesis_file ) ) {
      19           0 :     if( FD_LIKELY( errno==ENOENT ) ) return (ushort)0;
      20             : 
      21           0 :     FD_LOG_ERR(( "Opening genesis file (%s) failed (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      22           0 :   }
      23             : 
      24           0 :   while( !feof( genesis_file ) ) {
      25           0 :     ulong read = fread( buffer, 1UL, sizeof(buffer), genesis_file );
      26           0 :     if( FD_UNLIKELY( ferror( genesis_file ) ) )
      27           0 :       FD_LOG_ERR(( "fread failed `%s` (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      28             : 
      29           0 :     fd_sha256_append( sha, buffer, read );
      30           0 :   }
      31             : 
      32           0 :   if( FD_UNLIKELY( fclose( genesis_file ) ) )
      33           0 :     FD_LOG_ERR(( "fclose failed `%s` (%i-%s)", genesis_path, errno, fd_io_strerror( errno ) ));
      34             : 
      35           0 :   union {
      36           0 :     uchar  c[ 32 ];
      37           0 :     ushort s[ 16 ];
      38           0 :   } hash;
      39           0 :   fd_sha256_fini( sha, hash.c );
      40           0 :   fd_sha256_delete( fd_sha256_leave( sha ) );
      41             : 
      42           0 :   if( FD_LIKELY( opt_gen_hash ) ) memcpy( opt_gen_hash, hash.c, 32UL );
      43             : 
      44           0 :   ushort xor = 0;
      45           0 :   for( ulong i=0UL; i<16UL; i++ ) xor ^= hash.s[ i ];
      46             : 
      47           0 :   xor = fd_ushort_bswap( xor );
      48           0 :   return fd_ushort_if( xor<USHORT_MAX, (ushort)(xor + 1), USHORT_MAX );
      49           0 : }
      50             : 
      51             : #endif /* HEADER_fd_src_app_fddev_genesis_hash_h */