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+/* Xlunzip - Test tool for the lunzip linux module
+ Copyright (C) 2016-2018 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
+ the Free Software Foundation, either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef max
+ #define max(x,y) ((x) >= (y) ? (x) : (y))
+#endif
+#ifndef min
+ #define min(x,y) ((x) <= (y) ? (x) : (y))
+#endif
+
+void * resize_buffer( void * buf, const unsigned min_size );
+
+enum {
+ min_dictionary_bits = 12,
+ min_dictionary_size = 1 << min_dictionary_bits,
+ max_dictionary_bits = 29,
+ max_dictionary_size = 1 << max_dictionary_bits,
+ min_member_size = 36 };
+
+
+/* defined in main.c */
+extern int verbosity;
+
+struct Pretty_print
+ {
+ const char * name;
+ char * padded_name;
+ const char * stdin_name;
+ unsigned longest_name;
+ bool first_post;
+ };
+
+static inline void Pp_init( struct Pretty_print * const pp,
+ const char * const filenames[],
+ const int num_filenames )
+ {
+ unsigned stdin_name_len;
+ int i;
+ pp->name = 0;
+ pp->padded_name = 0;
+ pp->stdin_name = "(stdin)";
+ pp->longest_name = 0;
+ pp->first_post = false;
+
+ if( verbosity <= 0 ) return;
+ stdin_name_len = strlen( pp->stdin_name );
+ for( i = 0; i < num_filenames; ++i )
+ {
+ const char * const s = filenames[i];
+ const unsigned len = (strcmp( s, "-" ) == 0) ? stdin_name_len : strlen( s );
+ if( len > pp->longest_name ) pp->longest_name = len;
+ }
+ if( pp->longest_name == 0 ) pp->longest_name = stdin_name_len;
+ }
+
+static inline void Pp_set_name( struct Pretty_print * const pp,
+ const char * const filename )
+ {
+ unsigned name_len, padded_name_len, i = 0;
+
+ if( filename && filename[0] && strcmp( filename, "-" ) != 0 )
+ pp->name = filename;
+ else pp->name = pp->stdin_name;
+ name_len = strlen( pp->name );
+ padded_name_len = max( name_len, pp->longest_name ) + 4;
+ pp->padded_name = resize_buffer( pp->padded_name, padded_name_len + 1 );
+ while( i < 2 ) pp->padded_name[i++] = ' ';
+ while( i < name_len + 2 ) { pp->padded_name[i] = pp->name[i-2]; ++i; }
+ pp->padded_name[i++] = ':';
+ while( i < padded_name_len ) pp->padded_name[i++] = ' ';
+ pp->padded_name[i] = 0;
+ pp->first_post = true;
+ }
+
+static inline void Pp_reset( struct Pretty_print * const pp )
+ { if( pp->name && pp->name[0] ) pp->first_post = true; }
+void Pp_show_msg( struct Pretty_print * const pp, const char * const msg );
+
+
+static const uint8_t lzip_magic[4] = { 0x4C, 0x5A, 0x49, 0x50 }; /* "LZIP" */
+
+typedef uint8_t Lzip_header[6]; /* 0-3 magic bytes */
+ /* 4 version */
+ /* 5 coded_dict_size */
+enum { Lh_size = 6 };
+
+static inline bool Lh_verify_magic( const Lzip_header data )
+ { return ( memcmp( data, lzip_magic, 4 ) == 0 ); }
+
+/* detect (truncated) header */
+static inline bool Lh_verify_prefix( const Lzip_header data, const int sz )
+ {
+ int i; for( i = 0; i < sz && i < 4; ++i )
+ if( data[i] != lzip_magic[i] ) return false;
+ return ( sz > 0 );
+ }
+
+/* detect corrupt header */
+static inline bool Lh_verify_corrupt( const Lzip_header data )
+ {
+ int matches = 0;
+ int i; for( i = 0; i < 4; ++i )
+ if( data[i] == lzip_magic[i] ) ++matches;
+ return ( matches > 1 && matches < 4 );
+ }
+
+static inline uint8_t Lh_version( const Lzip_header data )
+ { return data[4]; }
+
+static inline bool Lh_verify_version( const Lzip_header data )
+ { return ( data[4] == 1 ); }
+
+static inline unsigned Lh_get_dictionary_size( const Lzip_header data )
+ {
+ unsigned sz = ( 1 << ( data[5] & 0x1F ) );
+ if( sz > min_dictionary_size )
+ sz -= ( sz / 16 ) * ( ( data[5] >> 5 ) & 7 );
+ return sz;
+ }
+
+
+typedef uint8_t Lzip_trailer[20];
+ /* 0-3 CRC32 of the uncompressed data */
+ /* 4-11 size of the uncompressed data */
+ /* 12-19 member size including header and trailer */
+enum { Lt_size = 20 };
+
+static inline unsigned Lt_get_data_crc( const Lzip_trailer data )
+ {
+ unsigned tmp = 0;
+ int i; for( i = 3; i >= 0; --i ) { tmp <<= 8; tmp += data[i]; }
+ return tmp;
+ }
+
+static inline unsigned long long Lt_get_data_size( const Lzip_trailer data )
+ {
+ unsigned long long tmp = 0;
+ int i; for( i = 11; i >= 4; --i ) { tmp <<= 8; tmp += data[i]; }
+ return tmp;
+ }
+
+static inline unsigned long long Lt_get_member_size( const Lzip_trailer data )
+ {
+ unsigned long long tmp = 0;
+ int i; for( i = 19; i >= 12; --i ) { tmp <<= 8; tmp += data[i]; }
+ return tmp;
+ }
+
+
+/* defined in in_place.c */
+int decompress_in_place( const int infd, struct Pretty_print * const pp,
+ const bool testing );
+
+/* defined in main.c */
+int convert_retval( const int retval );
+long flush( void * buf, unsigned long size );
+void show_error( const char * const msg, const int errcode, const bool help );
+void show_file_error( const char * const filename, const char * const msg,
+ const int errcode );