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-rw-r--r--lunzip.h87
1 files changed, 38 insertions, 49 deletions
diff --git a/lunzip.h b/lunzip.h
index e9a9ea2..4437ec6 100644
--- a/lunzip.h
+++ b/lunzip.h
@@ -1,5 +1,5 @@
/* Lunzip - Decompressor for lzip files
- Copyright (C) 2010, 2011, 2012 Antonio Diaz Diaz.
+ Copyright (C) 2010, 2011, 2012, 2013 Antonio Diaz Diaz.
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
@@ -22,39 +22,26 @@
#define min(x,y) ((x) <= (y) ? (x) : (y))
#endif
-typedef unsigned char State;
+typedef int State;
enum { states = 12 };
static inline bool St_is_char( const State st ) { return st < 7; }
-static inline void St_set_char( State * const st )
+static inline State St_set_char( const State st )
{
- static const unsigned char next[states] =
- { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
- *st = next[*st];
+ static const State next[states] = { 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 4, 5 };
+ return next[st];
}
-static inline void St_set_match( State * const st )
- {
- static const unsigned char next[states] =
- { 7, 7, 7, 7, 7, 7, 7, 10, 10, 10, 10, 10 };
- *st = next[*st];
- }
+static inline State St_set_match( const State st )
+ { return ( ( st < 7 ) ? 7 : 10 ); }
-static inline void St_set_rep( State * const st )
- {
- static const unsigned char next[states] =
- { 8, 8, 8, 8, 8, 8, 8, 11, 11, 11, 11, 11 };
- *st = next[*st];
- }
+static inline State St_set_rep( const State st )
+ { return ( ( st < 7 ) ? 8 : 11 ); }
-static inline void St_set_short_rep( State * const st )
- {
- static const unsigned char next[states] =
- { 9, 9, 9, 9, 9, 9, 9, 11, 11, 11, 11, 11 };
- *st = next[*st];
- }
+static inline State St_set_short_rep( const State st )
+ { return ( ( st < 7 ) ? 9 : 11 ); }
enum {
@@ -88,23 +75,25 @@ enum {
max_dis_states = 4 };
-static inline int get_dis_state( int len )
- {
- len -= min_match_len;
- if( len >= max_dis_states ) len = max_dis_states - 1;
- return len;
- }
+static inline int get_dis_state( const int len )
+ { return min( len - min_match_len, max_dis_states - 1 ); }
+
+static inline int get_lit_state( const uint8_t prev_byte )
+ { return ( prev_byte >> ( 8 - literal_context_bits ) ); }
enum { bit_model_move_bits = 5,
bit_model_total_bits = 11,
bit_model_total = 1 << bit_model_total_bits };
-typedef unsigned int Bit_model;
+typedef int Bit_model;
static inline void Bm_init( Bit_model * const probability )
{ *probability = bit_model_total / 2; }
+static inline void Bm_array_init( Bit_model * const p, const int size )
+ { int i = 0; while( i < size ) p[i++] = bit_model_total / 2; }
+
struct Pretty_print
{
@@ -121,7 +110,7 @@ void Pp_init( struct Pretty_print * const pp, const char * const filenames[],
static inline void Pp_set_name( struct Pretty_print * const pp,
const char * const filename )
{
- if( filename && filename[0] && strcmp( filename, "-" ) )
+ if( filename && filename[0] && strcmp( filename, "-" ) != 0 )
pp->name = filename;
else pp->name = pp->stdin_name;
pp->first_post = true;
@@ -136,12 +125,12 @@ typedef uint32_t CRC32[256]; /* Table of CRCs of all 8-bit messages. */
extern CRC32 crc32;
-static inline void CRC32_init()
+static inline void CRC32_init( void )
{
- unsigned int n;
+ unsigned n;
for( n = 0; n < 256; ++n )
{
- unsigned int c = n;
+ unsigned c = n;
int k;
for( k = 0; k < 8; ++k )
{ if( c & 1 ) c = 0xEDB88320U ^ ( c >> 1 ); else c >>= 1; }
@@ -151,6 +140,7 @@ static inline void CRC32_init()
static inline void CRC32_update_byte( uint32_t * crc, const uint8_t byte )
{ *crc = crc32[(*crc^byte)&0xFF] ^ ( *crc >> 8 ); }
+
static inline void CRC32_update_buf( uint32_t * crc, const uint8_t * const buffer,
const int size )
{
@@ -160,16 +150,15 @@ static inline void CRC32_update_buf( uint32_t * crc, const uint8_t * const buffe
}
-static inline int real_bits( const unsigned int value )
+static inline int real_bits( unsigned value )
{
- int bits = 0, i = 1;
- unsigned int mask = 1;
- for( ; mask > 0; ++i, mask <<= 1 ) if( value & mask ) bits = i;
+ int bits = 0;
+ while( value > 0 ) { value >>= 1; ++bits; }
return bits;
}
-static const uint8_t magic_string[4] = { 'L', 'Z', 'I', 'P' };
+static const uint8_t magic_string[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */
typedef uint8_t File_header[6]; /* 0-3 magic bytes */
/* 4 version */
@@ -226,43 +215,43 @@ enum { Ft_size = 20 };
static inline int Ft_versioned_size( const int version )
{ return ( ( version >= 1 ) ? 20 : 12 ); }
-static inline uint32_t Ft_get_data_crc( const File_trailer data )
+static inline unsigned Ft_get_data_crc( const File_trailer data )
{
- uint32_t tmp = 0;
+ unsigned tmp = 0;
int i;
for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; }
return tmp;
}
-static inline void Ft_set_data_crc( File_trailer data, uint32_t crc )
+static inline void Ft_set_data_crc( File_trailer data, unsigned crc )
{
int i;
for( i = 0; i <= 3; ++i ) { data[i] = (uint8_t)crc; crc >>= 8; }
}
-static inline long long Ft_get_data_size( const File_trailer data )
+static inline unsigned long long Ft_get_data_size( const File_trailer data )
{
- long long tmp = 0;
+ unsigned long long tmp = 0;
int i;
for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; }
return tmp;
}
-static inline void Ft_set_data_size( File_trailer data, long long sz )
+static inline void Ft_set_data_size( File_trailer data, unsigned long long sz )
{
int i;
for( i = 4; i <= 11; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; }
}
-static inline long long Ft_get_member_size( const File_trailer data )
+static inline unsigned long long Ft_get_member_size( const File_trailer data )
{
- long long tmp = 0;
+ unsigned long long tmp = 0;
int i;
for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; }
return tmp;
}
-static inline void Ft_set_member_size( File_trailer data, long long sz )
+static inline void Ft_set_member_size( File_trailer data, unsigned long long sz )
{
int i;
for( i = 12; i <= 19; ++i ) { data[i] = (uint8_t)sz; sz >>= 8; }
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 17:16:01 +0000