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+/* mpi-inline.h - Internal to the Multi Precision Integers
+ * Copyright (C) 1994, 1996, 1998, 1999,
+ * 2001, 2002 Free Software Foundation, Inc.
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * Note: This code is heavily based on the GNU MP Library.
+ * Actually it's the same code with only minor changes in the
+ * way the data is stored; this is to support the abstraction
+ * of an optional secure memory allocation which may be used
+ * to avoid revealing of sensitive data due to paging etc.
+ */
+
+#ifndef G10_MPI_INLINE_H
+#define G10_MPI_INLINE_H
+
+#ifndef G10_MPI_INLINE_DECL
+#define G10_MPI_INLINE_DECL extern __inline__
+#endif
+
+G10_MPI_INLINE_DECL mpi_limb_t
+_gcry_mpih_add_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb)
+{
+ mpi_limb_t x;
+
+ x = *s1_ptr++;
+ s2_limb += x;
+ *res_ptr++ = s2_limb;
+ if( s2_limb < x ) { /* sum is less than the left operand: handle carry */
+ while( --s1_size ) {
+ x = *s1_ptr++ + 1; /* add carry */
+ *res_ptr++ = x; /* and store */
+ if( x ) /* not 0 (no overflow): we can stop */
+ goto leave;
+ }
+ return 1; /* return carry (size of s1 to small) */
+ }
+
+ leave:
+ if( res_ptr != s1_ptr ) { /* not the same variable */
+ mpi_size_t i; /* copy the rest */
+ for( i=0; i < s1_size-1; i++ )
+ res_ptr[i] = s1_ptr[i];
+ }
+ return 0; /* no carry */
+}
+
+
+
+G10_MPI_INLINE_DECL mpi_limb_t
+_gcry_mpih_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_ptr_t s2_ptr, mpi_size_t s2_size)
+{
+ mpi_limb_t cy = 0;
+
+ if( s2_size )
+ cy = _gcry_mpih_add_n( res_ptr, s1_ptr, s2_ptr, s2_size );
+
+ if( s1_size - s2_size )
+ cy = _gcry_mpih_add_1( res_ptr + s2_size, s1_ptr + s2_size,
+ s1_size - s2_size, cy);
+ return cy;
+}
+
+
+G10_MPI_INLINE_DECL mpi_limb_t
+_gcry_mpih_sub_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
+ mpi_size_t s1_size, mpi_limb_t s2_limb )
+{
+ mpi_limb_t x;
+
+ x = *s1_ptr++;
+ s2_limb = x - s2_limb;
+ *res_ptr++ = s2_limb;
+ if( s2_limb > x ) {
+ while( --s1_size ) {
+ x = *s1_ptr++;
+ *res_ptr++ = x - 1;
+ if( x )
+ goto leave;
+ }
+ return 1;
+ }
+
+ leave:
+ if( res_ptr != s1_ptr ) {
+ mpi_size_t i;
+ for( i=0; i < s1_size-1; i++ )
+ res_ptr[i] = s1_ptr[i];
+ }
+ return 0;
+}
+
+
+
+G10_MPI_INLINE_DECL mpi_limb_t
+_gcry_mpih_sub( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
+ mpi_ptr_t s2_ptr, mpi_size_t s2_size)
+{
+ mpi_limb_t cy = 0;
+
+ if( s2_size )
+ cy = _gcry_mpih_sub_n(res_ptr, s1_ptr, s2_ptr, s2_size);
+
+ if( s1_size - s2_size )
+ cy = _gcry_mpih_sub_1(res_ptr + s2_size, s1_ptr + s2_size,
+ s1_size - s2_size, cy);
+ return cy;
+}
+
+/****************
+ * Compare OP1_PTR/OP1_SIZE with OP2_PTR/OP2_SIZE.
+ * There are no restrictions on the relative sizes of
+ * the two arguments.
+ * Return 1 if OP1 > OP2, 0 if they are equal, and -1 if OP1 < OP2.
+ */
+G10_MPI_INLINE_DECL int
+_gcry_mpih_cmp( mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size )
+{
+ mpi_size_t i;
+ mpi_limb_t op1_word, op2_word;
+
+ for( i = size - 1; i >= 0 ; i--) {
+ op1_word = op1_ptr[i];
+ op2_word = op2_ptr[i];
+ if( op1_word != op2_word )
+ goto diff;
+ }
+ return 0;
+
+ diff:
+ /* This can *not* be simplified to
+ * op2_word - op2_word
+ * since that expression might give signed overflow. */
+ return (op1_word > op2_word) ? 1 : -1;
+}
+
+
+#endif /*G10_MPI_INLINE_H*/