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+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
+
+/*
+ * File-Roller
+ *
+ * Copyright (C) 2006 The Free Software Foundation, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA.
+ */
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <glib.h>
+#include "java-utils.h"
+
+
+/*
+ * The following code conforms to the JVM specification.(Java 2 Platform)
+ * For further changes to the classfile structure, please update the
+ * following macros.
+ */
+
+
+/* Tags that identify structures */
+
+#define CONST_CLASS 7
+#define CONST_FIELDREF 9
+#define CONST_METHODREF 10
+#define CONST_INTERFACEMETHODREF 11
+#define CONST_STRING 8
+#define CONST_INTEGER 3
+#define CONST_FLOAT 4
+#define CONST_LONG 5
+#define CONST_DOUBLE 6
+#define CONST_NAMEANDTYPE 12
+#define CONST_UTF8 1
+
+/* Sizes of structures */
+
+#define CONST_CLASS_INFO 2
+#define CONST_FIELDREF_INFO 4
+#define CONST_METHODREF_INFO 4
+#define CONST_INTERFACEMETHODREF_INFO 4
+#define CONST_STRING_INFO 2
+#define CONST_INTEGER_INFO 4
+#define CONST_FLOAT_INFO 4
+#define CONST_LONG_INFO 8
+#define CONST_DOUBLE_INFO 8
+#define CONST_NAMEANDTYPE_INFO 4
+
+
+/* represents the utf8 strings in class file */
+struct utf_string
+{
+ guint16 index;
+ guint16 length;
+ char *str;
+};
+
+/* structure that holds class information in a class file */
+struct class_info
+{
+ guint16 index;
+ guint16 name_index; /* index into the utf_strings */
+};
+
+typedef struct {
+ int fd;
+
+ guint32 magic_no; /* 0xCAFEBABE (JVM Specification) :) */
+
+ guint16 major; /* versions */
+ guint16 minor;
+
+ guint16 const_pool_count;
+ GSList *const_pool_class; /* (const_pool_count - 1) elements of tye 'CONST_class_info' */
+ GSList *const_pool_utf; /* (const_pool_count - 1) elements of type 'utf_strings' */
+
+ guint16 access_flags;
+ guint16 this_class; /* the index of the class the file is named after. */
+
+#if 0 /* not needed */
+ guint16 super_class;
+ guint16 interfaces_count;
+ guint16 *interfaces;
+ guint16 fields_count;
+ field_info *fields;
+ guint16 methods_count;
+ method_info *methods;
+ guint16 attributes_count;
+ attribute_info *attributes;
+#endif
+} JavaClassFile;
+
+
+static JavaClassFile*
+java_class_file_new (void)
+{
+ JavaClassFile *cfile;
+
+ cfile = g_new0 (JavaClassFile, 1);
+ cfile->fd = -1;
+
+ return cfile;
+}
+
+
+static void
+java_class_file_free (JavaClassFile *cfile)
+{
+ GSList *scan;
+
+ if (cfile->const_pool_class != NULL) {
+ g_slist_foreach (cfile->const_pool_class, (GFunc)g_free, NULL);
+ g_slist_free (cfile->const_pool_class);
+ }
+
+ for (scan = cfile->const_pool_utf; scan ; scan = scan->next) {
+ struct utf_string *string = scan->data;
+ g_free (string->str);
+ }
+
+ if (cfile->const_pool_utf != NULL) {
+ g_slist_foreach (cfile->const_pool_utf, (GFunc)g_free, NULL);
+ g_slist_free (cfile->const_pool_utf);
+ }
+
+ if (cfile->fd != -1)
+ close (cfile->fd);
+
+ g_free (cfile);
+}
+
+
+/* The following function loads the utf8 strings and class structures from the
+ * class file. */
+static void
+load_constant_pool_utfs (JavaClassFile *cfile)
+{
+ guint8 tag;
+ guint16 i = 0; /* should be comparable with const_pool_count */
+
+ while ((i < cfile->const_pool_count - 1) && (read (cfile->fd, &tag, 1) != -1)) {
+ struct utf_string *txt = NULL;
+ struct class_info *class = NULL;
+
+ switch (tag) {
+ case CONST_CLASS:
+ class = g_new0 (struct class_info, 1);
+ class->index = i + 1;
+ if (read (cfile->fd, &class->name_index, 2) != 2) {
+ g_free (class);
+ return; /* error reading */
+ }
+ class->name_index = GUINT16_FROM_BE (class->name_index);
+ cfile->const_pool_class = g_slist_append (cfile->const_pool_class, class);
+ break;
+
+ case CONST_FIELDREF:
+ lseek (cfile->fd, CONST_FIELDREF_INFO, SEEK_CUR);
+ break;
+
+ case CONST_METHODREF:
+ lseek (cfile->fd, CONST_METHODREF_INFO, SEEK_CUR);
+ break;
+
+ case CONST_INTERFACEMETHODREF:
+ lseek (cfile->fd, CONST_INTERFACEMETHODREF_INFO, SEEK_CUR);
+ break;
+
+ case CONST_STRING:
+ lseek (cfile->fd, CONST_STRING_INFO, SEEK_CUR);
+ break;
+
+ case CONST_INTEGER:
+ lseek (cfile->fd, CONST_INTEGER_INFO, SEEK_CUR);
+ break;
+
+ case CONST_FLOAT:
+ lseek (cfile->fd, CONST_FLOAT_INFO, SEEK_CUR);
+ break;
+
+ case CONST_LONG:
+ lseek (cfile->fd, CONST_LONG_INFO, SEEK_CUR);
+ break;
+
+ case CONST_DOUBLE:
+ lseek (cfile->fd, CONST_DOUBLE_INFO, SEEK_CUR);
+ break;
+
+ case CONST_NAMEANDTYPE:
+ lseek (cfile->fd, CONST_NAMEANDTYPE_INFO, SEEK_CUR);
+ break;
+
+ case CONST_UTF8:
+ txt = g_new0 (struct utf_string, 1);
+ txt->index = i + 1;
+ if (read (cfile->fd, &(txt->length), 2) == -1) {
+ g_free (txt);
+ return; /* error while reading */
+ }
+ txt->length = GUINT16_FROM_BE (txt->length);
+ txt->str = g_new0 (char, txt->length);
+ if (read (cfile->fd, txt->str, txt->length) == -1) {
+ g_free (txt);
+ return; /* error while reading */
+ }
+ cfile->const_pool_utf = g_slist_append (cfile->const_pool_utf, txt);
+ break;
+
+ default:
+ return; /* error - unknown tag in class file */
+ break;
+ }
+ i++;
+ }
+
+#ifdef DEBUG
+ g_print( "Number of Entries: %d\n", i );
+#endif
+}
+
+
+static char*
+close_and_exit (JavaClassFile *cfile)
+{
+ java_class_file_free (cfile);
+ return NULL;
+}
+
+
+/* This function extracts the package name from a class file */
+char*
+get_package_name_from_class_file (char *fname)
+{
+ char *package = NULL;
+ JavaClassFile *cfile;
+ guint16 length = 0, end = 0, utf_index = 0;
+ guint32 magic;
+ guint16 major, minor, count;
+ int i = 0;
+
+ if (! g_file_test (fname, G_FILE_TEST_EXISTS))
+ return NULL;
+
+ cfile = java_class_file_new ();
+ cfile->fd = open (fname, O_RDONLY);
+ if (cfile->fd == -1)
+ return close_and_exit (cfile);
+
+ if ((i = read (cfile->fd, &magic, 4)) != 4)
+ return close_and_exit (cfile);
+ cfile->magic_no = GUINT32_FROM_BE (magic);
+
+ if (read (cfile->fd, &major, 2 ) != 2)
+ return close_and_exit (cfile);
+ cfile->major = GUINT16_FROM_BE (major);
+
+ if (read (cfile->fd, &minor, 2) != 2)
+ return close_and_exit (cfile);
+ cfile->minor = GUINT16_FROM_BE (minor);
+
+ if (read (cfile->fd, &count, 2) != 2)
+ return close_and_exit (cfile);
+ cfile->const_pool_count = GUINT16_FROM_BE(count);
+ load_constant_pool_utfs (cfile);
+
+ if (read (cfile->fd, &cfile->access_flags, 2) != 2)
+ return close_and_exit (cfile);
+ cfile->access_flags = GUINT16_FROM_BE (cfile->access_flags);
+
+ if (read (cfile->fd, &cfile->this_class, 2) != 2)
+ return close_and_exit (cfile);
+ cfile->this_class = GUINT16_FROM_BE(cfile->this_class);
+
+ /* now search for the class structure with index = cfile->this_class */
+
+ for (i = 0; (i < g_slist_length (cfile->const_pool_class)) && (utf_index == 0); i++ ) {
+ struct class_info *class = g_slist_nth_data (cfile->const_pool_class, i);
+ if (class->index == cfile->this_class)
+ utf_index = class->name_index; /* terminates loop */
+ }
+
+ /* now search for the utf8 string with index = utf_index */
+
+ for (i = 0; i < g_slist_length (cfile->const_pool_utf); i++) {
+ struct utf_string *data = g_slist_nth_data (cfile->const_pool_utf, i);
+ if (data->index == utf_index) {
+ package = g_strndup (data->str, data->length);
+ length = data->length;
+ break;
+ }
+ }
+
+ if (package != NULL) {
+ for (i = length; (i >= 0) && (end == 0); i-- )
+ if (package[i] == '/')
+ end = i;
+ package = g_strndup (package, end);
+ }
+
+ java_class_file_free (cfile);
+
+ return package;
+}
+
+
+/* This function consumes a comment from the java file
+ * multiline = TRUE implies that comment is multiline */
+static void
+consume_comment (int fdesc,
+ gboolean multiline)
+{
+ gboolean escaped = FALSE;
+ gboolean star = FALSE;
+ char ch;
+
+ while (read (fdesc, &ch, 1) == 1) {
+ switch (ch) {
+ case '/':
+ if (escaped)
+ break;
+ else if (star)
+ return;
+ break;
+
+ case '\n':
+ if (! multiline)
+ return;
+ break;
+
+ case '*':
+ escaped = FALSE;
+ star = TRUE;
+ break;
+
+ case '\\':
+ escaped = ! escaped;
+ break;
+
+ default:
+ escaped = FALSE;
+ star = FALSE;
+ break;
+ }
+ }
+}
+
+
+/* This function extracts package name from a java file */
+char*
+get_package_name_from_java_file (char *fname)
+{
+ char *package = NULL;
+ JavaClassFile *cfile;
+ gboolean prev_char_is_bslash = FALSE;
+ gboolean valid_char_found = FALSE;
+ char ch;
+
+ if (! g_file_test (fname, G_FILE_TEST_EXISTS))
+ return NULL;
+
+ cfile = java_class_file_new ();
+ cfile->fd = open (fname, O_RDONLY);
+ if (cfile->fd == -1)
+ return close_and_exit (cfile);
+
+ while (! valid_char_found && (read (cfile->fd, &ch, 1) == 1)) {
+ switch (ch) {
+ case '/':
+ if (prev_char_is_bslash == TRUE) {
+ consume_comment (cfile->fd, FALSE);
+ prev_char_is_bslash = FALSE;
+ }
+ else
+ prev_char_is_bslash = TRUE;
+ break;
+
+ case '*':
+ if (prev_char_is_bslash == TRUE)
+ consume_comment (cfile->fd, TRUE);
+ prev_char_is_bslash = FALSE;
+ break;
+
+ case ' ':
+ case '\t':
+ case '\r':
+ case '\n':
+ prev_char_is_bslash = FALSE;
+ break;
+
+ default:
+ prev_char_is_bslash = FALSE;
+ valid_char_found = TRUE;
+ break;
+ }
+ }
+
+ if (ch == 'p') {
+ char first_valid_word[8] = "";
+
+ first_valid_word[0] = 'p';
+ if (read (cfile->fd, &first_valid_word[1], 6) != 6)
+ return close_and_exit (cfile);
+
+ first_valid_word[7] = 0;
+ if (g_ascii_strcasecmp (first_valid_word, "package") == 0) {
+ char buffer[500];
+ int index = 0;
+
+ while (read (cfile->fd, &ch, 1) == 1) {
+ if (ch == ';')
+ break;
+ if (ch == '.')
+ buffer[index++] = '/';
+ else
+ buffer[index++] = ch;
+ }
+ buffer[index] = 0;
+ package = g_strdup (buffer);
+ }
+ }
+
+ java_class_file_free (cfile);
+
+ return package;
+}
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