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/***************************************************************************
* charpool.cc -- Handles Nmap's "character pool" memory allocation *
* system. *
* *
***********************IMPORTANT NMAP LICENSE TERMS************************
*
* The Nmap Security Scanner is (C) 1996-2023 Nmap Software LLC ("The Nmap
* Project"). Nmap is also a registered trademark of the Nmap Project.
*
* This program is distributed under the terms of the Nmap Public Source
* License (NPSL). The exact license text applying to a particular Nmap
* release or source code control revision is contained in the LICENSE
* file distributed with that version of Nmap or source code control
* revision. More Nmap copyright/legal information is available from
* https://nmap.org/book/man-legal.html, and further information on the
* NPSL license itself can be found at https://nmap.org/npsl/ . This
* header summarizes some key points from the Nmap license, but is no
* substitute for the actual license text.
*
* Nmap is generally free for end users to download and use themselves,
* including commercial use. It is available from https://nmap.org.
*
* The Nmap license generally prohibits companies from using and
* redistributing Nmap in commercial products, but we sell a special Nmap
* OEM Edition with a more permissive license and special features for
* this purpose. See https://nmap.org/oem/
*
* If you have received a written Nmap license agreement or contract
* stating terms other than these (such as an Nmap OEM license), you may
* choose to use and redistribute Nmap under those terms instead.
*
* The official Nmap Windows builds include the Npcap software
* (https://npcap.com) for packet capture and transmission. It is under
* separate license terms which forbid redistribution without special
* permission. So the official Nmap Windows builds may not be redistributed
* without special permission (such as an Nmap OEM license).
*
* Source is provided to this software because we believe users have a
* right to know exactly what a program is going to do before they run it.
* This also allows you to audit the software for security holes.
*
* Source code also allows you to port Nmap to new platforms, fix bugs, and add
* new features. You are highly encouraged to submit your changes as a Github PR
* or by email to the dev@nmap.org mailing list for possible incorporation into
* the main distribution. Unless you specify otherwise, it is understood that
* you are offering us very broad rights to use your submissions as described in
* the Nmap Public Source License Contributor Agreement. This is important
* because we fund the project by selling licenses with various terms, and also
* because the inability to relicense code has caused devastating problems for
* other Free Software projects (such as KDE and NASM).
*
* The free version of Nmap 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. Warranties,
* indemnification and commercial support are all available through the
* Npcap OEM program--see https://nmap.org/oem/
*
***************************************************************************/
/* $Id$ */
#include <stddef.h>
#undef NDEBUG
#include <assert.h>
#include "nbase.h"
/* Character pool memory allocation */
#include "charpool.h"
#include "nmap_error.h"
static CharPool g_charpool (16384);
const char *cp_strndup(const char *src, int len) {
return g_charpool.dup(src, len);
}
const char *cp_strdup(const char *src) {
return g_charpool.dup(src);
}
void cp_free(void) {
return g_charpool.clear();
}
class StrTable {
public:
StrTable() {
memset(table, 0, sizeof(table));
for (int i = 1; i <= CHAR_MAX; i++) {
table[i*2] = static_cast<char>(i);
}
}
const char *get(char c) { assert(c >= 0); return &table[c*2]; }
private:
char table[2*(CHAR_MAX + 1)];
};
static StrTable g_table;
const char *cp_char2str(char c) {
return g_table.get(c);
}
CharPool::CharPool(size_t init_sz) {
assert(init_sz >= 256);
/* Create our char pool */
currentbucketsz = init_sz;
nexti = 0;
char *b = (char *) safe_malloc(currentbucketsz);
buckets.push_back(b);
}
void CharPool::clear(void) {
for (BucketList::iterator it=buckets.begin(); it != buckets.end(); it++) {
free(*it);
}
buckets.clear();
}
const char *CharPool::dup(const char *src, int len) {
if (len < 0)
len = strlen(src);
if (len == 0)
return g_table.get('\0');
else if (len == 1)
return g_table.get(*src);
int sz = len + 1;
char *p = buckets.back() + nexti;
while (nexti + sz > currentbucketsz) {
/* Doh! We've got to make room */
currentbucketsz <<= 1;
nexti = 0;
p = (char *) safe_malloc(currentbucketsz);
buckets.push_back(p);
}
nexti += sz;
p[len] = '\0';
return (const char *) memcpy(p, src, len);
}
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