1 /* 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 /* This code is in the public domain. 13 ** Version: 1.1 Author: Walt Karas 14 */ 15 16 #include "hmm_intrnl.h" 17 18 U(size_aau) U(largest_available)(U(descriptor) *desc) { 19 U(size_bau) largest; 20 21 if (!(desc->avl_tree_root)) 22 largest = 0; 23 else { 24 #ifdef HMM_AUDIT_FAIL 25 /* Audit root block in AVL tree. */ 26 AUDIT_BLOCK(PTR_REC_TO_HEAD(desc->avl_tree_root)) 27 #endif 28 29 largest = 30 BLOCK_BAUS( 31 PTR_REC_TO_HEAD( 32 U(avl_search)( 33 (U(avl_avl) *) & (desc->avl_tree_root), 34 (U(size_bau)) ~(U(size_bau)) 0, AVL_LESS))); 35 } 36 37 if (desc->last_freed) { 38 /* Size of last freed block. */ 39 register U(size_bau) lf_size; 40 41 #ifdef HMM_AUDIT_FAIL 42 AUDIT_BLOCK(desc->last_freed) 43 #endif 44 45 lf_size = BLOCK_BAUS(desc->last_freed); 46 47 if (lf_size > largest) 48 largest = lf_size; 49 } 50 51 /* Convert largest size to AAUs and subract head size leaving payload 52 ** size. 53 */ 54 return(largest ? 55 ((largest * ((U(size_aau)) HMM_BLOCK_ALIGN_UNIT)) - HEAD_AAUS) : 56 0); 57 } 58
