diff options
Diffstat (limited to 'libraries/pack200/src/bytes.cpp')
| -rw-r--r-- | libraries/pack200/src/bytes.cpp | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/libraries/pack200/src/bytes.cpp b/libraries/pack200/src/bytes.cpp new file mode 100644 index 00000000..d3808afa --- /dev/null +++ b/libraries/pack200/src/bytes.cpp @@ -0,0 +1,217 @@ +/* + * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code 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 General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <assert.h> +#include <stdint.h> +#include "defines.h" +#include "bytes.h" +#include "utils.h" + +static byte dummy[1 << 10]; + +bool bytes::inBounds(const void *p) +{ + return p >= ptr && p < limit(); +} + +void bytes::malloc(size_t len_) +{ + len = len_; + ptr = NEW(byte, add_size(len_, 1)); // add trailing zero byte always + if (ptr == nullptr) + { + // set ptr to some victim memory, to ease escape + set(dummy, sizeof(dummy) - 1); + unpack_abort(ERROR_ENOMEM); + } +} + +void bytes::realloc(size_t len_) +{ + if (len == len_) + return; // nothing to do + if (ptr == dummy) + return; // escaping from an error + if (ptr == nullptr) + { + malloc(len_); + return; + } + byte *oldptr = ptr; + ptr = (len_ >= PSIZE_MAX) ? nullptr : (byte *)::realloc(ptr, add_size(len_, 1)); + if (ptr != nullptr) + { + if (len < len_) + memset(ptr + len, 0, len_ - len); + ptr[len_] = 0; + len = len_; + } + else + { + ptr = oldptr; // ease our escape + unpack_abort(ERROR_ENOMEM); + } +} + +void bytes::free() +{ + if (ptr == dummy) + return; // escaping from an error + if (ptr != nullptr) + { + ::free(ptr); + } + len = 0; + ptr = 0; +} + +int bytes::indexOf(byte c) +{ + byte *p = (byte *)memchr(ptr, c, len); + return (p == 0) ? -1 : (int)(p - ptr); +} + +byte *bytes::writeTo(byte *bp) +{ + memcpy(bp, ptr, len); + return bp + len; +} + +int bytes::compareTo(bytes &other) +{ + size_t l1 = len; + size_t l2 = other.len; + int cmp = memcmp(ptr, other.ptr, (l1 < l2) ? l1 : l2); + if (cmp != 0) + return cmp; + return (l1 < l2) ? -1 : (l1 > l2) ? 1 : 0; +} + +void bytes::saveFrom(const void *ptr_, size_t len_) +{ + malloc(len_); + // Save as much as possible. + if (len_ > len) + { + assert(ptr == dummy); // error recovery + len_ = len; + } + copyFrom(ptr_, len_); +} + +//#TODO: Need to fix for exception handling +void bytes::copyFrom(const void *ptr_, size_t len_, size_t offset) +{ + assert(len_ == 0 || inBounds(ptr + offset)); + assert(len_ == 0 || inBounds(ptr + offset + len_ - 1)); + memcpy(ptr + offset, ptr_, len_); +} + +// Make sure there are 'o' bytes beyond the fill pointer, +// advance the fill pointer, and return the old fill pointer. +byte *fillbytes::grow(size_t s) +{ + size_t nlen = add_size(b.len, s); + if (nlen <= allocated) + { + b.len = nlen; + return limit() - s; + } + size_t maxlen = nlen; + if (maxlen < 128) + maxlen = 128; + if (maxlen < allocated * 2) + maxlen = allocated * 2; + if (allocated == 0) + { + // Initial buffer was not malloced. Do not reallocate it. + bytes old = b; + b.malloc(maxlen); + if (b.len == maxlen) + old.writeTo(b.ptr); + } + else + { + b.realloc(maxlen); + } + allocated = b.len; + if (allocated != maxlen) + { + b.len = nlen - s; // back up + return dummy; // scribble during error recov. + } + // after realloc, recompute pointers + b.len = nlen; + assert(b.len <= allocated); + return limit() - s; +} + +void fillbytes::ensureSize(size_t s) +{ + if (allocated >= s) + return; + size_t len0 = b.len; + grow(s - size()); + b.len = len0; // put it back +} + +int ptrlist::indexOf(const void *x) +{ + int len = length(); + for (int i = 0; i < len; i++) + { + if (get(i) == x) + return i; + } + return -1; +} + +void ptrlist::freeAll() +{ + int len = length(); + for (int i = 0; i < len; i++) + { + void *p = (void *)get(i); + if (p != nullptr) + { + ::free(p); + } + } + free(); +} + +int intlist::indexOf(int x) +{ + int len = length(); + for (int i = 0; i < len; i++) + { + if (get(i) == x) + return i; + } + return -1; +} |