126 lines
4.9 KiB
C++
126 lines
4.9 KiB
C++
/* util.h --
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This file is part of the UPX executable compressor.
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Copyright (C) 1996-2022 Markus Franz Xaver Johannes Oberhumer
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Copyright (C) 1996-2022 Laszlo Molnar
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All Rights Reserved.
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UPX and the UCL library are free software; you can redistribute them
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and/or modify them under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING.
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If not, write to the Free Software Foundation, Inc.,
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59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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Markus F.X.J. Oberhumer Laszlo Molnar
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<markus@oberhumer.com> <ezerotven+github@gmail.com>
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*/
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#pragma once
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#ifndef UPX_UTIL_H__
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#define UPX_UTIL_H__ 1
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/*************************************************************************
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// assert sane memory buffer sizes to protect against integer overflows
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// and malicious header fields
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// see C 11 standard, Annex K
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**************************************************************************/
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inline bool mem_size_valid_bytes(upx_uint64_t bytes) noexcept { return bytes <= UPX_RSIZE_MAX; }
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bool mem_size_valid(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1 = 0,
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upx_uint64_t extra2 = 0) noexcept;
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// "new" with asserted size; will throw on failure
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#define New(type, n) new type[mem_size_get_n(sizeof(type), n)]
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// will throw on invalid size
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upx_rsize_t mem_size(upx_uint64_t element_size, upx_uint64_t n, upx_uint64_t extra1,
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upx_uint64_t extra2 = 0);
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// inline fast paths:
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// will throw on invalid size
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inline upx_rsize_t mem_size(upx_uint64_t element_size, upx_uint64_t n) {
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upx_uint64_t bytes = element_size * n;
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if __acc_very_unlikely (element_size == 0 || element_size > UPX_RSIZE_MAX ||
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n > UPX_RSIZE_MAX || bytes > UPX_RSIZE_MAX)
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return mem_size(element_size, n, 0, 0); // this will throw
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return ACC_ICONV(upx_rsize_t, bytes);
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}
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// will throw on invalid size
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inline upx_rsize_t mem_size_get_n(upx_uint64_t element_size, upx_uint64_t n) {
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(void) mem_size(element_size, n); // assert size
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return ACC_ICONV(upx_rsize_t, n); // and return n
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}
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// will throw on invalid size
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inline void mem_size_assert(upx_uint64_t element_size, upx_uint64_t n) {
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(void) mem_size(element_size, n); // assert size
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}
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// will throw on invalid size
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inline void mem_clear(void *p, size_t n) {
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(void) mem_size(1, n); // assert size
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memset(p, 0, n);
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}
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// ptrdiff_t with nullptr checks and asserted size; will throw on failure
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// NOTE: returns size_in_bytes, not number of elements!
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int ptr_diff_bytes(const void *a, const void *b);
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unsigned ptr_udiff_bytes(const void *a, const void *b); // asserts a >= b
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// short names "ptr_diff" and "ptr_udiff" for types with sizeof(X) == 1
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template <class T, class U>
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inline typename std::enable_if<sizeof(T) == 1 && sizeof(U) == 1, int>::type ptr_diff(const T *a,
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const U *b) {
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return ptr_diff_bytes(a, b);
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}
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template <class T, class U>
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inline typename std::enable_if<sizeof(T) == 1 && sizeof(U) == 1, unsigned>::type
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ptr_udiff(const T *a, const U *b) {
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return ptr_udiff_bytes(a, b);
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}
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/*************************************************************************
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// misc. support functions
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**************************************************************************/
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int find(const void *b, int blen, const void *what, int wlen);
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int find_be16(const void *b, int blen, unsigned what);
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int find_be32(const void *b, int blen, unsigned what);
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int find_be64(const void *b, int blen, upx_uint64_t what);
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int find_le16(const void *b, int blen, unsigned what);
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int find_le32(const void *b, int blen, unsigned what);
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int find_le64(const void *b, int blen, upx_uint64_t what);
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int mem_replace(void *b, int blen, const void *what, int wlen, const void *r);
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char *fn_basename(const char *name);
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int fn_strcmp(const char *n1, const char *n2);
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char *fn_strlwr(char *n);
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bool fn_has_ext(const char *name, const char *ext, bool ignore_case = true);
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bool file_exists(const char *name);
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bool maketempname(char *ofilename, size_t size, const char *ifilename, const char *ext,
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bool force = true);
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bool makebakname(char *ofilename, size_t size, const char *ifilename, bool force = true);
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unsigned get_ratio(upx_uint64_t u_len, upx_uint64_t c_len);
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bool set_method_name(char *buf, size_t size, int method, int level);
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void center_string(char *buf, size_t size, const char *s);
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#endif /* already included */
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/* vim:set ts=4 sw=4 et: */
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