X-Git-Url: http://winboard.nl/cgi-bin?a=blobdiff_plain;f=book.c;fp=book.c;h=73fb2d20fbd7aac568ba6bb6c8cc5161253c757c;hb=e15efca6667b2673b4c1a5879a6917eab6800e58;hp=0000000000000000000000000000000000000000;hpb=0d182b4efac85dce968068bfe4509e52e9a30051;p=polyglot.git

diff --git a/book.c b/book.c
new file mode 100644
index 0000000..73fb2d2
--- /dev/null
+++ b/book.c
@@ -0,0 +1,384 @@
+
+// book.c
+
+// includes
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "board.h"
+#include "book.h"
+#include "move.h"
+#include "move_legal.h"
+#include "san.h"
+#include "util.h"
+#include "option.h"
+
+// types
+
+typedef struct {
+   uint64 key;
+   uint16 move;
+   uint16 count;
+   uint16 n;
+   uint16 sum;
+} entry_t;
+
+// variables
+
+static FILE * BookFile;
+static int BookSize;
+
+// prototypes
+
+static int    find_pos      (uint64 key);
+
+static void   read_entry    (entry_t * entry, int n);
+static void   write_entry   (const entry_t * entry, int n);
+
+static uint64 read_integer  (FILE * file, int size);
+static void   write_integer (FILE * file, int size, uint64 n);
+
+// functions
+
+// book_clear()
+
+void book_clear() {
+
+   BookFile = NULL;
+   BookSize = 0;
+}
+
+bool book_is_open(){
+    return BookFile!=NULL;
+}
+
+// book_open()
+
+void book_open(const char file_name[]) {
+
+   ASSERT(file_name!=NULL);
+   if(option_get_bool("BookLearn")){
+       BookFile = fopen(file_name,"rb+");
+   }else{
+       BookFile = fopen(file_name,"rb");
+   }
+      
+//   if (BookFile == NULL) my_fatal("book_open(): can't open file \"%s\": %s\n",file_name,strerror(errno));
+   if (BookFile == NULL)  return; 
+
+   if (fseek(BookFile,0,SEEK_END) == -1) {
+      my_fatal("book_open(): fseek(): %s\n",strerror(errno));
+   }
+
+   BookSize = ftell(BookFile) / 16;
+//   if (BookSize == 0) my_fatal("book_open(): empty file\n");
+   if (BookSize == 0) {
+      book_close();
+      book_clear(); 
+   };
+}
+
+// book_close()
+
+void book_close() {
+
+   if(BookFile==NULL) return;
+
+   if (fclose(BookFile) == EOF) {
+      my_fatal("book_close(): fclose(): %s\n",strerror(errno));
+   }
+}
+
+// is_in_book()
+
+bool is_in_book(const board_t * board) {
+
+   int pos;
+   entry_t entry[1];
+
+   if(BookFile==NULL) return FALSE;
+
+   ASSERT(board!=NULL);
+
+   for (pos = find_pos(board->key); pos < BookSize; pos++) {
+      read_entry(entry,pos);
+      if (entry->key == board->key) return TRUE;
+   }
+
+   return FALSE;
+}
+
+// book_move()
+
+int book_move(const board_t * board, bool random) {
+
+   int best_move;
+   int best_score;
+   int pos;
+   entry_t entry[1];
+   int move;
+   int score;
+
+   if(BookFile==NULL) return MoveNone;
+
+   ASSERT(board!=NULL);
+   ASSERT(random==TRUE||random==FALSE);
+
+
+   best_move = MoveNone;
+   best_score = 0;
+   for (pos = find_pos(board->key); pos < BookSize; pos++) {
+
+      read_entry(entry,pos);
+      if (entry->key != board->key) break;
+
+      move = entry->move;
+      score = entry->count;
+
+      if (move != MoveNone && move_is_legal(move,board)) {
+
+         // pick this move?
+
+         ASSERT(score>0);
+
+         if (random) {
+            best_score += score;
+            if (my_random_int(best_score) < score) best_move = move;
+         } else {
+            if (score > best_score) {
+               best_move = move;
+               best_score = score;
+            }
+         }
+
+      } else {
+
+         ASSERT(FALSE);
+      }
+   }
+
+   return best_move;
+}
+
+// book_disp()
+
+void book_disp(const board_t * board) {
+
+   int first_pos;
+   int sum;
+   int pos;
+   entry_t entry[1];
+   int move;
+   int score;
+   char move_string[256];
+
+   ASSERT(board!=NULL);
+
+   if(BookFile==NULL) return; 
+
+   first_pos = find_pos(board->key);
+
+   // sum
+
+   sum = 0;
+
+   for (pos = first_pos; pos < BookSize; pos++) {
+
+      read_entry(entry,pos);
+      if (entry->key != board->key) break;
+
+      sum += entry->count;
+   }
+
+   // disp
+
+   for (pos = first_pos; pos < BookSize; pos++) {
+
+      read_entry(entry,pos);
+      if (entry->key != board->key) break;
+
+      move = entry->move;
+      score = entry->count;
+
+      if (score > 0 && move != MoveNone && move_is_legal(move,board)) {
+         move_to_san(move,board,move_string,256);
+         printf(" %s (%.0f%%)\n",move_string,((double)score)/((double)sum)*100.0);
+      }
+   }
+
+   printf("\n");
+}
+
+// book_learn_move()
+
+void book_learn_move(const board_t * board, int move, int result) {
+
+   int pos;
+   entry_t entry[1];
+
+   if(BookFile==NULL) return;
+
+   ASSERT(board!=NULL);
+   ASSERT(move_is_ok(move));
+   ASSERT(result>=-1&&result<=+1);
+
+   ASSERT(move_is_legal(move,board));
+
+   for (pos = find_pos(board->key); pos < BookSize; pos++) {
+
+      read_entry(entry,pos);
+      if (entry->key != board->key) break;
+
+      if (entry->move == move) {
+
+         entry->n++;
+         entry->sum += result+1;
+
+         write_entry(entry,pos);
+
+         break;
+      }
+   }
+}
+
+// book_flush()
+
+void book_flush() {
+
+   if(BookFile==NULL) return;
+
+   if (fflush(BookFile) == EOF) {
+      my_fatal("book_flush(): fflush(): %s\n",strerror(errno));
+   }
+}
+
+// find_pos()
+
+static int find_pos(uint64 key) {
+
+   int left, right, mid;
+   entry_t entry[1];
+
+   // binary search (finds the leftmost entry)
+
+   left = 0;
+   right = BookSize-1;
+
+   ASSERT(left<=right);
+
+   while (left < right) {
+
+      mid = (left + right) / 2;
+      ASSERT(mid>=left&&mid<right);
+
+      read_entry(entry,mid);
+
+      if (key <= entry->key) {
+         right = mid;
+      } else {
+         left = mid+1;
+      }
+   }
+
+   ASSERT(left==right);
+
+   read_entry(entry,left);
+
+   return (entry->key == key) ? left : BookSize;
+}
+
+// read_entry()
+
+static void read_entry(entry_t * entry, int n) {
+
+   ASSERT(entry!=NULL);
+   ASSERT(n>=0&&n<BookSize);
+
+   if (fseek(BookFile,n*16,SEEK_SET) == -1) {
+      my_fatal("read_entry(): fseek(): %s\n",strerror(errno));
+   }
+
+   entry->key   = read_integer(BookFile,8);
+   entry->move  = read_integer(BookFile,2);
+   entry->count = read_integer(BookFile,2);
+   entry->n     = read_integer(BookFile,2);
+   entry->sum   = read_integer(BookFile,2);
+}
+
+// write_entry()
+
+static void write_entry(const entry_t * entry, int n) {
+
+   ASSERT(entry!=NULL);
+   ASSERT(n>=0&&n<BookSize);
+
+   if (fseek(BookFile,n*16,SEEK_SET) == -1) {
+      my_fatal("write_entry(): fseek(): %s\n",strerror(errno));
+   }
+
+   write_integer(BookFile,8,entry->key);
+   write_integer(BookFile,2,entry->move);
+   write_integer(BookFile,2,entry->count);
+   write_integer(BookFile,2,entry->n);
+   write_integer(BookFile,2,entry->sum);
+}
+
+// read_integer()
+
+static uint64 read_integer(FILE * file, int size) {
+
+   uint64 n;
+   int i;
+   int b;
+
+   ASSERT(file!=NULL);
+   ASSERT(size>0&&size<=8);
+
+   n = 0;
+
+   for (i = 0; i < size; i++) {
+
+      b = fgetc(file);
+
+      if (b == EOF) {
+         if (feof(file)) {
+            my_fatal("read_integer(): fgetc(): EOF reached\n");
+         } else { // error
+            my_fatal("read_integer(): fgetc(): %s\n",strerror(errno));
+         }
+      }
+
+      ASSERT(b>=0&&b<256);
+      n = (n << 8) | b;
+   }
+
+   return n;
+}
+
+// write_integer()
+
+static void write_integer(FILE * file, int size, uint64 n) {
+
+   int i;
+   int b;
+
+   ASSERT(file!=NULL);
+   ASSERT(size>0&&size<=8);
+   ASSERT(size==8||n>>(size*8)==0);
+
+   for (i = size-1; i >= 0; i--) {
+
+      b = (n >> (i*8)) & 0xFF;
+      ASSERT(b>=0&&b<256);
+
+      if (fputc(b,file) == EOF) {
+         my_fatal("write_integer(): fputc(): %s\n",strerror(errno));
+      }
+   }
+}
+
+// end of book.cpp
+