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Update lzcomp
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@ -37,13 +37,16 @@ struct command * compress (const unsigned char * data, unsigned short * size, un
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} else {
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struct command * compressed_sequences[COMPRESSION_METHODS];
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unsigned short lengths[COMPRESSION_METHODS];
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unsigned flags = compressor -> methods;
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unsigned flags = 0;
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for (current = 0; current < COMPRESSION_METHODS; current ++) {
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lengths[current] = *size;
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if (!flags) flags = (++ compressor) -> methods;
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compressed_sequences[current] = compressor -> function(data, bitflipped, lengths + current, -- flags);
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if (flags == compressor -> methods) {
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flags = 0;
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compressor ++;
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}
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result = select_command_sequence(compressed_sequences, lengths, COMPRESSION_METHODS, size);
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compressed_sequences[current] = compressor -> function(data, bitflipped, lengths + current, flags ++);
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}
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result = select_optimal_sequence(compressed_sequences, lengths, size);
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for (current = 0; current < COMPRESSION_METHODS; current ++) free(compressed_sequences[current]);
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}
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free(bitflipped);
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@ -1,8 +1,47 @@
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#include "proto.h"
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struct command * select_command_sequence (struct command ** sequences, const unsigned short * lengths, unsigned count, unsigned short * final_length) {
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struct command * select_optimal_sequence (struct command ** sequences, const unsigned short * lengths, unsigned short * final_length) {
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struct command * compressor_sequences[NUM_COMPRESSORS * 2];
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unsigned short compressor_lengths[NUM_COMPRESSORS * 2];
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struct command * inverted_sequences[COMPRESSION_METHODS];
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unsigned short inverted_lengths[COMPRESSION_METHODS];
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unsigned p, current, method = 0;
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for (current = 0; current < NUM_COMPRESSORS; current ++) {
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compressor_sequences[current] = select_command_sequence(sequences + method, lengths + method, compressors[current].methods, compressor_lengths + current);
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compressor_sequences[current + NUM_COMPRESSORS] = select_command_sequence(sequences + method, lengths + method, -(int) compressors[current].methods,
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compressor_lengths + (current + NUM_COMPRESSORS));
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for (p = 0; p < compressors[current].methods; p ++) {
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inverted_sequences[method + compressors[current].methods - 1 - p] = sequences[method + p];
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inverted_lengths[method + compressors[current].methods - 1 - p] = lengths[method + p];
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}
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method += compressors[current].methods;
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}
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unsigned short final_lengths[8];
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struct command * final_sequences[8] = {
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select_command_sequence(compressor_sequences, compressor_lengths, NUM_COMPRESSORS, final_lengths),
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select_command_sequence(compressor_sequences, compressor_lengths, -NUM_COMPRESSORS, final_lengths + 1),
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select_command_sequence(compressor_sequences + NUM_COMPRESSORS, compressor_lengths + NUM_COMPRESSORS, NUM_COMPRESSORS, final_lengths + 2),
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select_command_sequence(compressor_sequences + NUM_COMPRESSORS, compressor_lengths + NUM_COMPRESSORS, -NUM_COMPRESSORS, final_lengths + 3),
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select_command_sequence(sequences, lengths, COMPRESSION_METHODS, final_lengths + 4),
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select_command_sequence(sequences, lengths, -COMPRESSION_METHODS, final_lengths + 5),
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select_command_sequence(inverted_sequences, inverted_lengths, COMPRESSION_METHODS, final_lengths + 6),
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select_command_sequence(inverted_sequences, inverted_lengths, -COMPRESSION_METHODS, final_lengths + 7)
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};
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for (current = 0; current < (2 * NUM_COMPRESSORS); current ++) free(compressor_sequences[current]);
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struct command * result = select_command_sequence(final_sequences, final_lengths, 8, final_length);
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for (current = 0; current < 8; current ++) free(final_sequences[current]);
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return result;
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}
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struct command * select_command_sequence (struct command ** sequences, const unsigned short * lengths, int count, unsigned short * final_length) {
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// negative count indicates iterating backwards
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unsigned short min_sequence = 0, min_length = compressed_length(*sequences, *lengths);
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unsigned short seq, len;
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int backwards = 0;
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if (count < 0) {
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backwards = 1;
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count = -count;
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}
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for (seq = 1; seq < count; seq ++) {
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len = compressed_length(sequences[seq], lengths[seq]);
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if (len < min_length) {
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@ -15,7 +54,9 @@ struct command * select_command_sequence (struct command ** sequences, const uns
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memcpy(current, sequences[min_sequence], *final_length * sizeof(struct command));
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struct command * new;
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for (seq = 1; seq < count; seq ++) {
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if (backwards) seq = count - seq;
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new = merge_command_sequences(current, *final_length, sequences[(seq + min_sequence) % count], lengths[(seq + min_sequence) % count], final_length);
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if (backwards) seq = count - seq; // restore the value for the loop
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free(current);
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current = new;
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}
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@ -17,7 +17,7 @@ void optimize (struct command * commands, unsigned short count) {
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next -> command = 7;
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continue;
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}
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if (next -> command == commands -> command) {
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if (next -> command == commands -> command)
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switch (commands -> command) {
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case 0:
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if ((commands -> value + commands -> count) != next -> value) break;
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@ -40,8 +40,6 @@ void optimize (struct command * commands, unsigned short count) {
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}
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next -> count = (commands -> count + next -> count) - MAX_COMMAND_COUNT;
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commands -> count = MAX_COMMAND_COUNT;
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break;
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}
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}
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commands = next;
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}
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@ -3,6 +3,7 @@
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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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@ -48,7 +49,8 @@ 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_command_sequence(struct command **, const unsigned short *, unsigned, unsigned short *);
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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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