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Added get_xxxx_signed() functions.

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committer: mfx <mfx> 1027515231 +0000
This commit is contained in:
Markus F.X.J. Oberhumer 2002-07-24 12:53:51 +00:00
parent f4aa80e6b4
commit 9c1feb24e6
1 changed files with 45 additions and 3 deletions
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48
src/bele.h
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@ -1,4 +1,4 @@
/* bele.h -- /* bele.h -- access memory in BigEndian and LittleEndian byte order
This file is part of the UPX executable compressor. This file is part of the UPX executable compressor.
@ -31,7 +31,7 @@
/************************************************************************* /*************************************************************************
// access memory in BigEndian and LittleEndian byte order // core
**************************************************************************/ **************************************************************************/
inline unsigned get_be16(const void *bb) inline unsigned get_be16(const void *bb)
@ -145,6 +145,48 @@ inline void set_le32(void *bb, unsigned v)
} }
/*************************************************************************
// get signed values, i.e. sign-extend
**************************************************************************/
inline int sign_extend(int v, int bits)
{
const int sign_bit = 1 << (bits - 1);
v |= -(v & sign_bit);
return v;
}
inline int get_be16_signed(const void *bb)
{
int v = get_be16(bb);
return sign_extend(v, 16);
}
inline int get_be32_signed(const void *bb)
{
int v = get_be32(bb);
return sign_extend(v, 32);
}
inline int get_le16_signed(const void *bb)
{
int v = get_le16(bb);
return sign_extend(v, 16);
}
inline int get_le24_signed(const void *bb)
{
int v = get_le24(bb);
return sign_extend(v, 24);
}
inline int get_le32_signed(const void *bb)
{
int v = get_le32(bb);
return sign_extend(v, 32);
}
/************************************************************************* /*************************************************************************
// classes for portable unaligned access // classes for portable unaligned access
**************************************************************************/ **************************************************************************/
@ -279,7 +321,7 @@ int le32_compare(const void *e1, const void *e2);
// just for testing... // just for testing...
#if 0 && defined(__i386__) && defined(__GNUC__) #if 0 && defined(__i386__) && defined(__GNUC_VERSION_HEX__)
# if (__GNUC_VERSION_HEX__ >= 0x030100) # if (__GNUC_VERSION_HEX__ >= 0x030100)
typedef unsigned short LE16_unaligned __attribute__((__packed__,__aligned__(1))); typedef unsigned short LE16_unaligned __attribute__((__packed__,__aligned__(1)));
typedef unsigned int LE32_unaligned __attribute__((__packed__,__aligned__(1))); typedef unsigned int LE32_unaligned __attribute__((__packed__,__aligned__(1)));