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108 lines
5.2 KiB
C
108 lines
5.2 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#define NUM_COMPRESSORS 4
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#define COMPRESSION_METHODS 96 /* sum of all values for the methods field in compressors */
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#define MAX_FILE_SIZE 32768
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#define SHORT_COMMAND_COUNT 32
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#define MAX_COMMAND_COUNT 1024
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#define LOOKBACK_LIMIT 128 /* highest negative valid count for a copy command */
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#define LOOKAHEAD_LIMIT 3072 /* maximum lookahead distance for the first pass of multi-pass compression */
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#define MULTIPASS_SKIP_THRESHOLD 64
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#if __STDC_VERSION__ >= 201112L
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// <noreturn.h> forces "noreturn void", which is silly and redundant; this is simpler
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#define noreturn _Noreturn void
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#else
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#define noreturn void /* fallback */
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#endif
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struct command {
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unsigned command: 3; // commands 0-6 as per compression spec; command 7 is used as a dummy placeholder
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unsigned count: 12; // always equals the uncompressed data length
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signed value: 17; // offset for commands 0 (into source) and 4-6 (into decompressed output); repeated bytes for commands 1-2
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};
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struct compressor {
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unsigned methods;
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const char * name;
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struct command * (* function) (const unsigned char *, const unsigned char *, unsigned short *, unsigned);
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};
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struct options {
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const char * input;
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const char * output;
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unsigned method; // method to use, or >= COMPRESSION_METHODS to try them all
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unsigned char mode; // 0: compress, 1: compress to text, 2: uncompress, 3: dump commands as text
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unsigned char alignment; // 1 << value
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};
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// global.c
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extern const struct compressor compressors[];
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extern const unsigned char bit_flipping_table[];
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extern char option_name_buffer[];
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// main.c
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int main(int, char **);
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struct command * compress(const unsigned char *, unsigned short *, unsigned);
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// merging.c
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struct command * select_optimal_sequence(struct command **, const unsigned short *, unsigned short *);
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struct command * select_command_sequence(struct command **, const unsigned short *, int, unsigned short *);
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struct command * merge_command_sequences(const struct command *, unsigned short, const struct command *, unsigned short, unsigned short *);
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// mpcomp.c
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struct command * try_compress_multi_pass(const unsigned char *, const unsigned char *, unsigned short *, unsigned);
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struct command pick_command_for_pass(const unsigned char *, const unsigned char *, const unsigned char *, const short *, unsigned short,
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unsigned short, unsigned);
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struct command pick_repetition_for_pass(const unsigned char *, unsigned short, unsigned short, unsigned);
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struct command pick_copy_for_pass(const unsigned char *, const unsigned char *, const short *, unsigned char, unsigned short, unsigned short, unsigned);
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// nullcomp.c
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struct command * store_uncompressed(const unsigned char *, const unsigned char *, unsigned short *, unsigned);
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// options.c
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struct options get_options(int, char **);
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unsigned parse_numeric_option_argument(char ***, unsigned);
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int parse_compressor_option_argument(char ***);
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const char * get_argument_for_option(char ***, const char **);
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noreturn usage(const char *);
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noreturn list_compressors(void);
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// output.c
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void write_commands_to_textfile(const char *, const struct command *, unsigned, const unsigned char *, unsigned char);
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void write_commands_and_padding_to_textfile(const char *, const struct command *, unsigned, const unsigned char *, unsigned, unsigned);
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void write_command_to_textfile(FILE *, struct command, const unsigned char *);
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void write_commands_to_file(const char *, const struct command *, unsigned, const unsigned char *, unsigned char);
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void write_command_to_file(FILE *, struct command, const unsigned char *);
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void write_raw_data_to_file(const char *, const void *, unsigned);
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// packing.c
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void optimize(struct command *, unsigned short);
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void repack(struct command **, unsigned short *);
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// repcomp.c
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struct command * try_compress_repetitions(const unsigned char *, const unsigned char *, unsigned short *, unsigned);
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struct command find_repetition_at_position(const unsigned char *, unsigned short, unsigned short);
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// spcomp.c
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struct command * try_compress_single_pass(const unsigned char *, const unsigned char *, unsigned short *, unsigned);
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struct command find_best_copy(const unsigned char *, unsigned short, unsigned short, const unsigned char *, unsigned);
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unsigned short scan_forwards(const unsigned char *, unsigned short, const unsigned char *, unsigned short, short *);
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unsigned short scan_backwards(const unsigned char *, unsigned short, unsigned short, short *);
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struct command find_best_repetition(const unsigned char *, unsigned short, unsigned short);
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// uncomp.c
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struct command * get_commands_from_file(const unsigned char *, unsigned short * restrict, unsigned short * restrict);
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unsigned char * get_uncompressed_data(const struct command *, const unsigned char *, unsigned short *);
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// util.c
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noreturn error_exit(int, const char *, ...);
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unsigned char * read_file_into_buffer(const char *, unsigned short *);
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struct command pick_best_command(unsigned, struct command, ...);
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int is_better(struct command, struct command);
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short command_size(struct command);
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unsigned short compressed_length(const struct command *, unsigned short);
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