summaryrefslogtreecommitdiffstats
path: root/decoder.h
diff options
context:
space:
mode:
Diffstat (limited to 'decoder.h')
-rw-r--r--decoder.h83
1 files changed, 44 insertions, 39 deletions
diff --git a/decoder.h b/decoder.h
index c81147f..65174b5 100644
--- a/decoder.h
+++ b/decoder.h
@@ -1,5 +1,5 @@
/* Lunzip - Decompressor for lzip files
- Copyright (C) 2010, 2011 Antonio Diaz Diaz.
+ Copyright (C) 2010, 2011, 2012 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
@@ -31,33 +31,27 @@ struct Range_decoder
bool Rd_read_block( struct Range_decoder * const rdec );
-static inline void Rd_init( struct Range_decoder * const rdec, const int ifd )
+static inline bool Rd_init( struct Range_decoder * const rdec, const int ifd )
{
rdec->partial_member_pos = 0;
rdec->buffer = (uint8_t *)malloc( rd_buffer_size );
- if( !rdec->buffer )
- {
- show_error( "Not enough memory. Find a machine with more memory.", 0, false );
- cleanup_and_fail( 1 );
- }
+ if( !rdec->buffer ) return false;
rdec->pos = 0;
rdec->stream_pos = 0;
rdec->code = 0;
rdec->range = 0xFFFFFFFFU;
rdec->infd = ifd;
rdec->at_stream_end = false;
+ return true;
}
static inline void Rd_free( struct Range_decoder * const rdec )
- { free( rdec->buffer ); rdec->buffer = 0; }
-
-static inline bool Rd_code_is_zero( struct Range_decoder * const rdec )
- { return ( rdec->code == 0 ); }
+ { free( rdec->buffer ); }
static inline bool Rd_finished( struct Range_decoder * const rdec )
{ return rdec->pos >= rdec->stream_pos && !Rd_read_block( rdec ); }
-static inline long long Rd_member_position( struct Range_decoder * const rdec )
+static inline long long Rd_member_position( const struct Range_decoder * const rdec )
{ return rdec->partial_member_pos + rdec->pos; }
static inline void Rd_reset_member_position( struct Range_decoder * const rdec )
@@ -65,10 +59,24 @@ static inline void Rd_reset_member_position( struct Range_decoder * const rdec )
static inline uint8_t Rd_get_byte( struct Range_decoder * const rdec )
{
- if( Rd_finished( rdec ) ) return 0;
+ if( Rd_finished( rdec ) ) return 0x55; /* make code != 0 */
return rdec->buffer[rdec->pos++];
}
+static inline int Rd_read_data( struct Range_decoder * const rdec,
+ uint8_t * const outbuf, const int size )
+ {
+ int rest = size;
+ while( rest > 0 && !Rd_finished( rdec ) )
+ {
+ const int rd = min( rest, rdec->stream_pos - rdec->pos );
+ memcpy( outbuf + size - rest, rdec->buffer + rdec->pos, rd );
+ rdec->pos += rd;
+ rest -= rd;
+ }
+ return ( rest > 0 ) ? size - rest : size;
+ }
+
static inline void Rd_load( struct Range_decoder * const rdec )
{
int i;
@@ -223,27 +231,27 @@ struct Literal_decoder
Bit_model bm_literal[1<<literal_context_bits][0x300];
};
-static inline void Lid_init( struct Literal_decoder * const literal_decoder )
+static inline void Lid_init( struct Literal_decoder * const lidec )
{
int i, j;
for( i = 0; i < 1<<literal_context_bits; ++i )
for( j = 0; j < 0x300; ++j )
- Bm_init( &literal_decoder->bm_literal[i][j] );
+ Bm_init( &lidec->bm_literal[i][j] );
}
-static inline int Lid_state( const int prev_byte )
+static inline int Lid_state( const uint8_t prev_byte )
{ return ( prev_byte >> ( 8 - literal_context_bits ) ); }
-static inline uint8_t Lid_decode( struct Literal_decoder * const literal_decoder,
+static inline uint8_t Lid_decode( struct Literal_decoder * const lidec,
struct Range_decoder * const rdec,
const uint8_t prev_byte )
- { return Rd_decode_tree( rdec, literal_decoder->bm_literal[Lid_state(prev_byte)], 8 ); }
+ { return Rd_decode_tree( rdec, lidec->bm_literal[Lid_state(prev_byte)], 8 ); }
-static inline uint8_t Lid_decode_matched( struct Literal_decoder * const literal_decoder,
+static inline uint8_t Lid_decode_matched( struct Literal_decoder * const lidec,
struct Range_decoder * const rdec,
const uint8_t prev_byte,
const uint8_t match_byte )
- { return Rd_decode_matched( rdec, literal_decoder->bm_literal[Lid_state(prev_byte)], match_byte ); }
+ { return Rd_decode_matched( rdec, lidec->bm_literal[Lid_state(prev_byte)], match_byte ); }
struct LZ_decoder
@@ -254,7 +262,7 @@ struct LZ_decoder
uint8_t * buffer; /* output buffer */
int pos; /* current pos in buffer */
int stream_pos; /* first byte not yet written to file */
- uint32_t crc_;
+ uint32_t crc;
int outfd; /* output file descriptor */
int member_version;
@@ -279,14 +287,14 @@ void LZd_flush_data( struct LZ_decoder * const decoder );
bool LZd_verify_trailer( struct LZ_decoder * const decoder,
struct Pretty_print * const pp );
-static inline uint8_t LZd_get_prev_byte( struct LZ_decoder * const decoder )
- {
- const int i =
- ( ( decoder->pos > 0 ) ? decoder->pos : decoder->buffer_size ) - 1;
- return decoder->buffer[i];
- }
+static inline uint8_t LZd_get_prev_byte( const struct LZ_decoder * const decoder )
+ {
+ const int i =
+ ( ( decoder->pos > 0 ) ? decoder->pos : decoder->buffer_size ) - 1;
+ return decoder->buffer[i];
+ }
-static inline uint8_t LZd_get_byte( struct LZ_decoder * const decoder,
+static inline uint8_t LZd_get_byte( const struct LZ_decoder * const decoder,
const int distance )
{
int i = decoder->pos - distance - 1;
@@ -320,7 +328,7 @@ static inline void LZd_copy_block( struct LZ_decoder * const decoder,
}
}
-static inline void LZd_init( struct LZ_decoder * const decoder,
+static inline bool LZd_init( struct LZ_decoder * const decoder,
const File_header header,
struct Range_decoder * const rdec, const int ofd )
{
@@ -329,14 +337,10 @@ static inline void LZd_init( struct LZ_decoder * const decoder,
decoder->dictionary_size = Fh_get_dictionary_size( header );
decoder->buffer_size = max( 65536, decoder->dictionary_size );
decoder->buffer = (uint8_t *)malloc( decoder->buffer_size );
- if( !decoder->buffer )
- {
- show_error( "Not enough memory. Find a machine with more memory.", 0, false );
- cleanup_and_fail( 1 );
- }
+ if( !decoder->buffer ) return false;
decoder->pos = 0;
decoder->stream_pos = 0;
- decoder->crc_ = 0xFFFFFFFFU;
+ decoder->crc = 0xFFFFFFFFU;
decoder->outfd = ofd;
decoder->member_version = Fh_version( header );
@@ -365,15 +369,16 @@ static inline void LZd_init( struct LZ_decoder * const decoder,
Led_init( &decoder->rep_match_len_decoder );
Lid_init( &decoder->literal_decoder );
decoder->buffer[decoder->buffer_size-1] = 0; /* prev_byte of first_byte */
+ return true;
}
static inline void LZd_free( struct LZ_decoder * const decoder )
- { free( decoder->buffer ); decoder->buffer = 0; }
+ { free( decoder->buffer ); }
-static inline uint32_t LZd_crc( struct LZ_decoder * const decoder )
- { return decoder->crc_ ^ 0xFFFFFFFFU; }
+static inline uint32_t LZd_crc( const struct LZ_decoder * const decoder )
+ { return decoder->crc ^ 0xFFFFFFFFU; }
-static inline long long LZd_data_position( struct LZ_decoder * const decoder )
+static inline long long LZd_data_position( const struct LZ_decoder * const decoder )
{ return decoder->partial_data_pos + decoder->pos; }
int LZd_decode_member( struct LZ_decoder * const decoder,
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-04 05:07:55 +0000