358 lines
11 KiB
C
358 lines
11 KiB
C
/*
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* Copyright (c) 2003, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include "jni.h"
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#include "jli_util.h"
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#include "version_comp.h"
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/*
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* A collection of useful strings. One should think of these as #define
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* entries, but actual strings can be more efficient (with many compilers).
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*/
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static const char *separators = ".-_";
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static const char *zero_string = "0";
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/*
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* Validate a string as parsable as a "Java int". If so parsable,
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* return true (non-zero) and store the numeric value at the address
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* passed in as "value"; otherwise return false (zero).
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*
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* Note that the maximum allowable value is 2147483647 as defined by
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* the "Java Language Specification" which precludes the use of native
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* conversion routines which may have other limits.
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*
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* Also note that we don't have to worry about the alternate maximum
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* allowable value of 2147483648 because it is only allowed after
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* the unary negation operator and this grammar doesn't have one
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* of those.
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*
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* Finally, note that a value which exceeds the maximum jint value will
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* return false (zero). This results in the otherwise purely numeric
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* string being compared as a string of characters (as per the spec.)
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*/
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static int
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isjavaint(const char *s, jint *value)
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{
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jlong sum = 0;
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jint digit;
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while (*s != '\0')
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if (isdigit(*s)) {
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digit = (jint)((int)(*s++) - (int)('0'));
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sum = (sum * 10) + digit;
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if (sum > 2147483647)
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return (0); /* Overflows jint (but not jlong) */
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} else
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return (0);
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*value = (jint)sum;
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return (1);
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}
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/*
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* Modeled after strcmp(), compare two strings (as in the grammar defined
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* in Appendix A of JSR 56). If both strings can be interpreted as
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* Java ints, do a numeric comparison, else it is strcmp().
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*/
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static int
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comp_string(const char *s1, const char *s2)
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{
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jint v1, v2;
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if (isjavaint(s1, &v1) && isjavaint(s2, &v2))
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return ((int)(v1 - v2));
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else
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return (JLI_StrCmp(s1, s2));
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}
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/*
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* Modeled after strcmp(), compare two version-ids for a Prefix
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* Match as defined in JSR 56.
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*/
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int
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JLI_PrefixVersionId(const char *id1, char *id2)
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{
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char *s1 = JLI_StringDup(id1);
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char *s2 = JLI_StringDup(id2);
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char *m1 = s1;
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char *m2 = s2;
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char *end1 = NULL;
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char *end2 = NULL;
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int res = 0;
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do {
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if ((s1 != NULL) && ((end1 = JLI_StrPBrk(s1, ".-_")) != NULL))
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*end1 = '\0';
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if ((s2 != NULL) && ((end2 = JLI_StrPBrk(s2, ".-_")) != NULL))
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*end2 = '\0';
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res = comp_string(s1, s2);
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if (end1 != NULL)
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s1 = end1 + 1;
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else
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s1 = NULL;
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if (end2 != NULL)
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s2 = end2 + 1;
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else
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s2 = NULL;
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} while (res == 0 && ((s1 != NULL) && (s2 != NULL)));
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JLI_MemFree(m1);
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JLI_MemFree(m2);
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return (res);
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}
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/*
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* Modeled after strcmp(), compare two version-ids for an Exact
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* Match as defined in JSR 56.
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*/
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int
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JLI_ExactVersionId(const char *id1, char *id2)
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{
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char *s1 = JLI_StringDup(id1);
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char *s2 = JLI_StringDup(id2);
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char *m1 = s1;
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char *m2 = s2;
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char *end1 = NULL;
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char *end2 = NULL;
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int res = 0;
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do {
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if ((s1 != NULL) && ((end1 = JLI_StrPBrk(s1, separators)) != NULL))
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*end1 = '\0';
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if ((s2 != NULL) && ((end2 = JLI_StrPBrk(s2, separators)) != NULL))
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*end2 = '\0';
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if ((s1 != NULL) && (s2 == NULL))
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res = comp_string(s1, zero_string);
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else if ((s1 == NULL) && (s2 != NULL))
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res = comp_string(zero_string, s2);
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else
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res = comp_string(s1, s2);
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if (end1 != NULL)
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s1 = end1 + 1;
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else
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s1 = NULL;
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if (end2 != NULL)
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s2 = end2 + 1;
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else
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s2 = NULL;
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} while (res == 0 && ((s1 != NULL) || (s2 != NULL)));
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JLI_MemFree(m1);
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JLI_MemFree(m2);
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return (res);
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}
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/*
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* Return true if this simple-element (as defined in JSR 56) forms
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* an acceptable match.
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*
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* JSR 56 is modified by the Java Web Start <rel> Developer Guide
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* where it is stated "... Java Web Start will not consider an installed
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* non-FCS (i.e., milestone) JRE as a match. ... a JRE from Sun
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* Microsystems, Inc., is by convention a non-FCS (milestone) JRE
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* if there is a dash (-) in the version string."
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*
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* An undocumented caveat to the above is that an exact match with a
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* hyphen is accepted as a development extension.
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*
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* These modifications are addressed by the specific comparisons
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* for releases with hyphens.
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*/
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static int
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acceptable_simple_element(const char *release, char *simple_element)
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{
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char *modifier;
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modifier = simple_element + JLI_StrLen(simple_element) - 1;
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if (*modifier == '*') {
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*modifier = '\0';
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if (JLI_StrChr(release, '-'))
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return ((JLI_StrCmp(release, simple_element) == 0)?1:0);
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return ((JLI_PrefixVersionId(release, simple_element) == 0)?1:0);
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} else if (*modifier == '+') {
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*modifier = '\0';
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if (JLI_StrChr(release, '-'))
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return ((JLI_StrCmp(release, simple_element) == 0)?1:0);
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return ((JLI_ExactVersionId(release, simple_element) >= 0)?1:0);
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} else {
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return ((JLI_ExactVersionId(release, simple_element) == 0)?1:0);
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}
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}
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/*
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* Return true if this element (as defined in JSR 56) forms
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* an acceptable match. An element is the intersection (and)
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* of multiple simple-elements.
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*/
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static int
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acceptable_element(const char *release, char *element)
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{
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char *end;
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do {
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if ((end = JLI_StrChr(element, '&')) != NULL)
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*end = '\0';
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if (!acceptable_simple_element(release, element))
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return (0);
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if (end != NULL)
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element = end + 1;
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} while (end != NULL);
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return (1);
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}
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/*
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* Checks if release is acceptable by the specification version-string.
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* Return true if this version-string (as defined in JSR 56) forms
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* an acceptable match. A version-string is the union (or) of multiple
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* elements.
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*/
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int
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JLI_AcceptableRelease(const char *release, char *version_string)
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{
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char *vs;
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char *m1;
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char *end;
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m1 = vs = JLI_StringDup(version_string);
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do {
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if ((end = JLI_StrChr(vs, ' ')) != NULL)
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*end = '\0';
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if (acceptable_element(release, vs)) {
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JLI_MemFree(m1);
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return (1);
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}
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if (end != NULL)
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vs = end + 1;
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} while (end != NULL);
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JLI_MemFree(m1);
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return (0);
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}
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/*
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* Return true if this is a valid simple-element (as defined in JSR 56).
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*
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* The official grammar for a simple-element is:
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*
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* simple-element ::= version-id | version-id modifier
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* modifier ::= '+' | '*'
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* version-id ::= string ( separator string )*
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* string ::= char ( char )*
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* char ::= Any ASCII character except a space, an
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* ampersand, a separator or a modifier
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* separator ::= '.' | '-' | '_'
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*
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* However, for efficiency, it is time to abandon the top down parser
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* implementation. After deleting the potential trailing modifier, we
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* are left with a version-id.
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*
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* Note that a valid version-id has three simple properties:
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*
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* 1) Doesn't contain a space, an ampersand or a modifier.
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*
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* 2) Doesn't begin or end with a separator.
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*
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* 3) Doesn't contain two adjacent separators.
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*
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* Any other line noise constitutes a valid version-id.
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*/
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static int
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valid_simple_element(char *simple_element)
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{
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char *last;
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size_t len;
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if ((simple_element == NULL) || ((len = JLI_StrLen(simple_element)) == 0))
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return (0);
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last = simple_element + len - 1;
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if (*last == '*' || *last == '+') {
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if (--len == 0)
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return (0);
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*last-- = '\0';
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}
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if (JLI_StrPBrk(simple_element, " &+*") != NULL) /* Property #1 */
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return (0);
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if ((JLI_StrChr(".-_", *simple_element) != NULL) || /* Property #2 */
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(JLI_StrChr(".-_", *last) != NULL))
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return (0);
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for (; simple_element != last; simple_element++) /* Property #3 */
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if ((JLI_StrChr(".-_", *simple_element) != NULL) &&
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(JLI_StrChr(".-_", *(simple_element + 1)) != NULL))
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return (0);
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return (1);
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}
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/*
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* Return true if this is a valid element (as defined in JSR 56).
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* An element is the intersection (and) of multiple simple-elements.
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*/
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static int
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valid_element(char *element)
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{
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char *end;
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if ((element == NULL) || (JLI_StrLen(element) == 0))
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return (0);
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do {
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if ((end = JLI_StrChr(element, '&')) != NULL)
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*end = '\0';
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if (!valid_simple_element(element))
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return (0);
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if (end != NULL)
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element = end + 1;
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} while (end != NULL);
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return (1);
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}
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/*
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* Validates a version string by the extended JSR 56 grammar.
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*/
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int
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JLI_ValidVersionString(char *version_string)
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{
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char *vs;
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char *m1;
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char *end;
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if ((version_string == NULL) || (JLI_StrLen(version_string) == 0))
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return (0);
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m1 = vs = JLI_StringDup(version_string);
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do {
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if ((end = JLI_StrChr(vs, ' ')) != NULL)
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*end = '\0';
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if (!valid_element(vs)) {
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JLI_MemFree(m1);
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return (0);
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}
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if (end != NULL)
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vs = end + 1;
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} while (end != NULL);
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JLI_MemFree(m1);
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return (1);
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}
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