diff options
Diffstat (limited to 'src/common')
| -rwxr-xr-x | src/common/Makefile.am | 16 | ||||
| -rwxr-xr-x | src/common/endianness.c | 166 | ||||
| -rwxr-xr-x | src/common/endianness.h | 54 |
3 files changed, 236 insertions, 0 deletions
diff --git a/src/common/Makefile.am b/src/common/Makefile.am new file mode 100755 index 0000000..323ba17 --- /dev/null +++ b/src/common/Makefile.am @@ -0,0 +1,16 @@ + +lib_LIBRARIES = libcommon.a + +libcommon_a_SOURCES = \ + endianness.h endianness.c + +libcommon_a_CFLAGS = $(AM_CFLAGS) + + +INCLUDES = + +AM_CPPFLAGS = + +AM_CFLAGS = $(DEBUG_CFLAGS) $(WARNING_FLAGS) + +SUBDIRS = diff --git a/src/common/endianness.c b/src/common/endianness.c new file mode 100755 index 0000000..202262a --- /dev/null +++ b/src/common/endianness.c @@ -0,0 +1,166 @@ + +/* OpenIDA - Outil d'analyse de fichiers binaires + * endianness.c - manipulation abstraite des nombres + * + * Copyright (C) 2008 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 "endianness.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. * +* endian = ordre des bits dans la source. * +* * +* Description : Lit un nombre non signé sur un octet. * +* * +* Retour : Bilan de l'opération : true en cas de succès, false sinon. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool read_u8(uint8_t *target, const uint8_t *data, off_t *pos, off_t len, SourceEndian endian) +{ + if ((len - *pos) < 1) return false; + + *target = data[*pos]; + + *pos += 1; + + return true; + +} + + +/****************************************************************************** +* * +* 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. * +* endian = ordre des bits dans la source. * +* * +* Description : Lit un nombre non signé sur deux octets. * +* * +* Retour : Bilan de l'opération : true en cas de succès, false sinon. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool read_u16(uint16_t *target, const uint8_t *data, off_t *pos, off_t len, SourceEndian endian) +{ + if ((len - *pos) < 2) return false; + + switch (endian) + { + + + + case SRE_BIG: + +#if __BYTE_ORDER == __LITTLE_ENDIAN + + *target = data[*pos + 1] | (uint16_t)data[*pos] << 8; + +#elif __BYTE_ORDER == __BIG_ENDIAN + + *target = data[*pos] | (uint16_t)data[*pos + 1] << 8; + +#else + +# error "TODO : PDP !" + +#endif + + break; + + + } + + *pos += 2; + + return true; + +} + + +/****************************************************************************** +* * +* 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. * +* endian = ordre des bits dans la source. * +* * +* Description : Lit un nombre non signé sur quatre octets. * +* * +* Retour : Bilan de l'opération : true en cas de succès, false sinon. * +* * +* Remarques : - * +* * +******************************************************************************/ + +bool read_u32(uint32_t *target, const uint8_t *data, off_t *pos, off_t len, SourceEndian endian) +{ + if ((len - *pos) < 4) return false; + + switch (endian) + { + + + + case SRE_BIG: + +#if __BYTE_ORDER == __LITTLE_ENDIAN + + *target = data[*pos + 3] | (uint16_t)data[*pos + 2] << 8; + *target |= data[*pos + 1] << 16 | (uint16_t)data[*pos] << 24; + +#elif __BYTE_ORDER == __BIG_ENDIAN + + *target = data[*pos] | (uint16_t)data[*pos + 1] << 8; + *target |= data[*pos + 2] << 16 | (uint16_t)data[*pos + 3] << 24; + +#else + +# error "TODO : PDP !" + +#endif + + break; + + + } + + *pos += 4; + + return true; + +} diff --git a/src/common/endianness.h b/src/common/endianness.h new file mode 100755 index 0000000..7ae9575 --- /dev/null +++ b/src/common/endianness.h @@ -0,0 +1,54 @@ + +/* OpenIDA - Outil d'analyse de fichiers binaires + * endianness.h - prototypes pour la manipulation abstraite des nombres + * + * Copyright (C) 2008 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_ENDIANNESS_H +#define _COMMON_ENDIANNESS_H + + +#include <stdbool.h> +#include <stdint.h> +#include <sys/types.h> + + +/* Type de boutismes existants */ +typedef enum _SourceEndian +{ + SRE_LITTLE, /* Petits boutistes */ + SRE_BIG, /* Gros boutistes */ + SRE_MIDDLE /* Moyens boutistes */ + +} SourceEndian; + + +/* Lit un nombre non signé sur un octet. */ +bool read_u8(uint8_t *, const uint8_t *, off_t *, off_t, SourceEndian ); + +/* Lit un nombre non signé sur deux octets. */ +bool read_u16(uint16_t *, const uint8_t *, off_t *, off_t, SourceEndian); + +/* Lit un nombre non signé sur quatre octets. */ +bool read_u32(uint32_t *, const uint8_t *, off_t *, off_t, SourceEndian); + + + +#endif /* _COMMON_ENDIANNESS_H */ |