Supported Dalvik VM / DEX (partially).

git-svn-id: svn://svn.gna.org/svn/chrysalide/trunk@155 abbe820e-26c8-41b2-8c08-b7b2b41f8b0a

5 files changed, 199 insertions, 1 deletions

diff --git a/src/common/Makefile.am b/src/common/Makefile.am
index 7aa255e..f8e4f20 100755
--- a/src/common/Makefile.am
+++ b/src/common/Makefile.am
@@ -6,6 +6,7 @@ libcommon_la_SOURCES =					\
 	endianness.h endianness.c			\
 	environment.h environment.c			\
 	extstr.h extstr.c					\
+	leb128.h leb128.c					\
 	macros.h							\
 	xml.h xml.c
 
diff --git a/src/common/endianness.c b/src/common/endianness.c
index 32bb65a..5c9b183 100755
--- a/src/common/endianness.c
+++ b/src/common/endianness.c
@@ -25,8 +25,42 @@
 
 
 
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : target = lieu d'enregistrement de la lecture. [OUT]          *
+*                data   = flux de données à analyser.                         *
+*                pos    = position courante dans ce flux. [OUT]               *
+*                len    = taille totale des données à analyser.               *
+*                low    = position éventuelle des 4 bits visés. [OUT]         *
+*                endian = ordre des bits dans la source.                      *
+*                                                                             *
+*  Description : Lit un nombre non signé sur 4 bits.                          *
+*                                                                             *
+*  Retour      : Bilan de l'opération : true en cas de succès, false sinon.   *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool read_u4(uint8_t *target, const bin_t *data, off_t *pos, off_t len, bool *low, SourceEndian endian)
+{
+    if ((len - *pos) < 1) return false;
+
+    if (*low)
+    {
+        *target = data[*pos] & 0x0f;
+        *low = false;
+    }
+    else
+    {
+        *target = (data[*pos] & 0xf0) >> 4;
+        *low = true;
+        *pos += 1;
+    }
 
+    return true;
 
+}
 
 
 /******************************************************************************
diff --git a/src/common/endianness.h b/src/common/endianness.h
index f9d421e..f729ac5 100755
--- a/src/common/endianness.h
+++ b/src/common/endianness.h
@@ -26,7 +26,6 @@
 
 
 #include <stdbool.h>
-#include <sys/types.h>
 
 
 #include "../arch/archbase.h"
@@ -43,6 +42,9 @@ typedef enum _SourceEndian
 } SourceEndian;
 
 
+/* Lit un nombre non signé sur 4 bits. */
+bool read_u4(uint8_t *, const bin_t *, off_t *, off_t, bool *, SourceEndian);
+
 /* Lit un nombre non signé sur un octet. */
 bool read_u8(uint8_t *, const bin_t *, off_t *, off_t, SourceEndian);
 
@@ -56,6 +58,7 @@ bool read_u32(uint32_t *, const bin_t *, off_t *, off_t, SourceEndian);
 bool read_u64(uint64_t *, const bin_t *, off_t *, off_t, SourceEndian);
 
 
+#define read_s4(target, data, pos, len, low, endian) read_u4((uint8_t *)target, data, pos, len, low, endian)
 #define read_s8(target, data, pos, len, endian) read_u8((uint8_t *)target, data, pos, len, endian)
 #define read_s16(target, data, pos, len, endian) read_u16((uint16_t *)target, data, pos, len, endian)
 #define read_s32(target, data, pos, len, endian) read_u32((uint32_t *)target, data, pos, len, endian)
diff --git a/src/common/leb128.c b/src/common/leb128.c
new file mode 100644
index 0000000..4a03797
--- /dev/null
+++ b/src/common/leb128.c
@@ -0,0 +1,111 @@
+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * leb128.c - support des valeurs encodées au format LEB128.
+ *
+ * Copyright (C) 2010 Cyrille Bagard
+ *
+ *  This file is part of OpenIDA.
+ *
+ *  OpenIDA 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  OpenIDA 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "leb128.h"
+
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : target = lieu d'enregistrement de la lecture. [OUT]          *
+*                data   = flux de données à analyser.                         *
+*                pos    = position courante dans ce flux. [OUT]               *
+*                len    = taille totale des données à analyser.               *
+*                                                                             *
+*  Description : Lit un nombre non signé encodé au format LEB128.             *
+*                                                                             *
+*  Retour      : Bilan de l'opération : true en cas de succès, false sinon.   *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool read_uleb128(uleb128_t *target, const bin_t *data, off_t *pos, off_t len)
+{
+    int shift;                              /* Décallage à appliquer       */
+    off_t i;                                /* Boucle de parcours          */
+
+    shift = 0;
+    *target = 0;
+
+    for (i = 0; i < 8; i++)
+    {
+        /* On évite les débordements... */
+        if (*pos >= len) return false;
+
+        *target |= (data[*pos] & 0x7f) << shift;
+
+        shift += 7;
+        (*pos)++;
+
+        if ((data[*pos - 1] & 0x80) == 0x00) break;
+
+    }
+
+    return (i < 8);
+
+}
+
+
+/******************************************************************************
+*                                                                             *
+*  Paramètres  : target = lieu d'enregistrement de la lecture. [OUT]          *
+*                data   = flux de données à analyser.                         *
+*                pos    = position courante dans ce flux. [OUT]               *
+*                len    = taille totale des données à analyser.               *
+*                                                                             *
+*  Description : Lit un nombre signé encodé au format LEB128.                 *
+*                                                                             *
+*  Retour      : Bilan de l'opération : true en cas de succès, false sinon.   *
+*                                                                             *
+*  Remarques   : -                                                            *
+*                                                                             *
+******************************************************************************/
+
+bool read_leb128(leb128_t *target, const bin_t *data, off_t *pos, off_t len)
+{
+    int shift;                              /* Décallage à appliquer       */
+    off_t i;                                /* Boucle de parcours          */
+
+    shift = 0;
+    *target = 0;
+
+    for (i = 0; i < 8; i++)
+    {
+        /* On évite les débordements... */
+        if (*pos >= len) return false;
+
+        *target |= (data[*pos] & 0x7f) << shift;
+
+        shift += 7;
+
+        if ((data[(*pos)++] & 0x80) == 0x00) break;
+
+    }
+
+    if (shift < (8 * sizeof(int64_t)) && (data[*pos - 1] & 0x40) == 0x40)
+        *target |= - (1 << shift);
+
+    return (i < 8);
+
+}
diff --git a/src/common/leb128.h b/src/common/leb128.h
new file mode 100644
index 0000000..0364cf7
--- /dev/null
+++ b/src/common/leb128.h
@@ -0,0 +1,49 @@
+
+/* OpenIDA - Outil d'analyse de fichiers binaires
+ * leb128.h - prototypes pour le support des valeurs encodées au format LEB128.
+ *
+ * Copyright (C) 2010 Cyrille Bagard
+ *
+ *  This file is part of OpenIDA.
+ *
+ *  OpenIDA 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 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  OpenIDA 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 Foobar.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef _COMMON_LEB128_H
+#define _COMMON_LEB128_H
+
+
+#include <stdbool.h>
+
+
+#include "../arch/archbase.h"
+
+
+
+/* Nouveaux types */
+typedef uint64_t uleb128_t;
+typedef int64_t leb128_t;
+
+
+
+/* Lit un nombre non signé encodé au format LEB128. */
+bool read_uleb128(uleb128_t *, const bin_t *, off_t *, off_t);
+
+/* Lit un nombre signé encodé au format LEB128. */
+bool read_leb128(leb128_t *, const bin_t *, off_t *, off_t);
+
+
+
+#endif  /* _COMMON_LEB128_H */