mirror of
https://github.com/n64decomp/sm64.git
synced 2024-11-14 05:15:09 -05:00
576 lines
15 KiB
C
576 lines
15 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#if defined(_WIN32) || defined(_WIN64)
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#include <io.h>
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#include <fcntl.h>
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#endif
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#include "libmio0.h"
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#include "utils.h"
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// defines
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#define MIO0_VERSION "0.1"
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#define GET_BIT(buf, bit) ((buf)[(bit) / 8] & (1 << (7 - ((bit) % 8))))
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// types
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typedef struct
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{
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int *indexes;
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int allocated;
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int count;
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int start;
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} lookback;
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// functions
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#define LOOKBACK_COUNT 256
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#define LOOKBACK_INIT_SIZE 128
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static lookback *lookback_init(void)
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{
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lookback *lb = malloc(LOOKBACK_COUNT * sizeof(*lb));
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for (int i = 0; i < LOOKBACK_COUNT; i++) {
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lb[i].allocated = LOOKBACK_INIT_SIZE;
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lb[i].indexes = malloc(lb[i].allocated * sizeof(*lb[i].indexes));
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lb[i].count = 0;
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lb[i].start = 0;
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}
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return lb;
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}
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static void lookback_free(lookback *lb)
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{
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for (int i = 0; i < LOOKBACK_COUNT; i++) {
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free(lb[i].indexes);
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}
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free(lb);
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}
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static inline void lookback_push(lookback *lkbk, unsigned char val, int index)
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{
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lookback *lb = &lkbk[val];
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if (lb->count == lb->allocated) {
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lb->allocated *= 4;
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lb->indexes = realloc(lb->indexes, lb->allocated * sizeof(*lb->indexes));
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}
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lb->indexes[lb->count++] = index;
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}
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static void PUT_BIT(unsigned char *buf, int bit, int val)
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{
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unsigned char mask = 1 << (7 - (bit % 8));
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unsigned int offset = bit / 8;
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buf[offset] = (buf[offset] & ~(mask)) | (val ? mask : 0);
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}
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// used to find longest matching stream in buffer
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// buf: buffer
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// start_offset: offset in buf to look back from
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// max_search: max number of bytes to find
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// found_offset: returned offset found (0 if none found)
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// returns max length of matching stream (0 if none found)
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static int find_longest(const unsigned char *buf, int start_offset, int max_search, int *found_offset, lookback *lkbk)
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{
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int best_length = 0;
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int best_offset = 0;
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int cur_length;
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int search_len;
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int farthest, off, i;
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int lb_idx;
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const unsigned char first = buf[start_offset];
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lookback *lb = &lkbk[first];
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// buf
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// | off start max
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// V |+i-> |+i-> |
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// |--------------raw-data-----------------|
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// |+i-> | |+i->
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// +cur_length
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// check at most the past 4096 values
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farthest = MAX(start_offset - 4096, 0);
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// find starting index
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for (lb_idx = lb->start; lb_idx < lb->count && lb->indexes[lb_idx] < farthest; lb_idx++) {}
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lb->start = lb_idx;
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for ( ; lb_idx < lb->count && lb->indexes[lb_idx] < start_offset; lb_idx++) {
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off = lb->indexes[lb_idx];
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// check at most requested max or up until start
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search_len = MIN(max_search, start_offset - off);
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for (i = 0; i < search_len; i++) {
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if (buf[start_offset + i] != buf[off + i]) {
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break;
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}
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}
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cur_length = i;
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// if matched up until start, continue matching in already matched parts
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if (cur_length == search_len) {
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// check at most requested max less current length
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search_len = max_search - cur_length;
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for (i = 0; i < search_len; i++) {
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if (buf[start_offset + cur_length + i] != buf[off + i]) {
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break;
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}
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}
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cur_length += i;
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}
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if (cur_length > best_length) {
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best_offset = start_offset - off;
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best_length = cur_length;
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}
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}
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// return best reverse offset and length (may be 0)
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*found_offset = best_offset;
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return best_length;
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}
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// decode MIO0 header
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// returns 1 if valid header, 0 otherwise
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int mio0_decode_header(const unsigned char *buf, mio0_header_t *head)
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{
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if (!memcmp(buf, "MIO0", 4)) {
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head->dest_size = read_u32_be(&buf[4]);
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head->comp_offset = read_u32_be(&buf[8]);
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head->uncomp_offset = read_u32_be(&buf[12]);
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return 1;
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}
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return 0;
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}
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void mio0_encode_header(unsigned char *buf, const mio0_header_t *head)
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{
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memcpy(buf, "MIO0", 4);
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write_u32_be(&buf[4], head->dest_size);
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write_u32_be(&buf[8], head->comp_offset);
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write_u32_be(&buf[12], head->uncomp_offset);
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}
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int mio0_decode(const unsigned char *in, unsigned char *out, unsigned int *end)
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{
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mio0_header_t head;
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unsigned int bytes_written = 0;
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int bit_idx = 0;
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int comp_idx = 0;
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int uncomp_idx = 0;
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int valid;
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// extract header
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valid = mio0_decode_header(in, &head);
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// verify MIO0 header
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if (!valid) {
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return -2;
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}
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// decode data
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while (bytes_written < head.dest_size) {
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if (GET_BIT(&in[MIO0_HEADER_LENGTH], bit_idx)) {
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// 1 - pull uncompressed data
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out[bytes_written] = in[head.uncomp_offset + uncomp_idx];
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bytes_written++;
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uncomp_idx++;
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} else {
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// 0 - read compressed data
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int idx;
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int length;
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int i;
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const unsigned char *vals = &in[head.comp_offset + comp_idx];
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comp_idx += 2;
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length = ((vals[0] & 0xF0) >> 4) + 3;
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idx = ((vals[0] & 0x0F) << 8) + vals[1] + 1;
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for (i = 0; i < length; i++) {
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out[bytes_written] = out[bytes_written - idx];
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bytes_written++;
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}
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}
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bit_idx++;
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}
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if (end) {
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*end = head.uncomp_offset + uncomp_idx;
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}
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return bytes_written;
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}
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int mio0_encode(const unsigned char *in, unsigned int length, unsigned char *out)
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{
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unsigned char *bit_buf;
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unsigned char *comp_buf;
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unsigned char *uncomp_buf;
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unsigned int bit_length;
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unsigned int comp_offset;
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unsigned int uncomp_offset;
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unsigned int bytes_proc = 0;
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int bytes_written;
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int bit_idx = 0;
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int comp_idx = 0;
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int uncomp_idx = 0;
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lookback *lookbacks;
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// initialize lookback buffer
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lookbacks = lookback_init();
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// allocate some temporary buffers worst case size
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bit_buf = malloc((length + 7) / 8); // 1-bit/byte
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comp_buf = malloc(length); // 16-bits/2bytes
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uncomp_buf = malloc(length); // all uncompressed
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memset(bit_buf, 0, (length + 7) / 8);
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// encode data
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// special case for first byte
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lookback_push(lookbacks, in[0], 0);
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uncomp_buf[uncomp_idx] = in[0];
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uncomp_idx += 1;
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bytes_proc += 1;
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PUT_BIT(bit_buf, bit_idx++, 1);
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while (bytes_proc < length) {
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int offset;
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int max_length = MIN(length - bytes_proc, 18);
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int longest_match = find_longest(in, bytes_proc, max_length, &offset, lookbacks);
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// push current byte before checking next longer match
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lookback_push(lookbacks, in[bytes_proc], bytes_proc);
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if (longest_match > 2) {
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int lookahead_offset;
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// lookahead to next byte to see if longer match
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int lookahead_length = MIN(length - bytes_proc - 1, 18);
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int lookahead_match = find_longest(in, bytes_proc + 1, lookahead_length, &lookahead_offset, lookbacks);
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// better match found, use uncompressed + lookahead compressed
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if ((longest_match + 1) < lookahead_match) {
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// uncompressed byte
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uncomp_buf[uncomp_idx] = in[bytes_proc];
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uncomp_idx++;
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PUT_BIT(bit_buf, bit_idx, 1);
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bytes_proc++;
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longest_match = lookahead_match;
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offset = lookahead_offset;
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bit_idx++;
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lookback_push(lookbacks, in[bytes_proc], bytes_proc);
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}
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// first byte already pushed above
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for (int i = 1; i < longest_match; i++) {
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lookback_push(lookbacks, in[bytes_proc + i], bytes_proc + i);
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}
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// compressed block
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comp_buf[comp_idx] = (((longest_match - 3) & 0x0F) << 4) |
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(((offset - 1) >> 8) & 0x0F);
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comp_buf[comp_idx + 1] = (offset - 1) & 0xFF;
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comp_idx += 2;
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PUT_BIT(bit_buf, bit_idx, 0);
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bytes_proc += longest_match;
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} else {
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// uncompressed byte
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uncomp_buf[uncomp_idx] = in[bytes_proc];
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uncomp_idx++;
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PUT_BIT(bit_buf, bit_idx, 1);
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bytes_proc++;
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}
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bit_idx++;
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}
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// compute final sizes and offsets
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// +7 so int division accounts for all bits
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bit_length = ((bit_idx + 7) / 8);
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// compressed data after control bits and aligned to 4-byte boundary
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comp_offset = ALIGN(MIO0_HEADER_LENGTH + bit_length, 4);
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uncomp_offset = comp_offset + comp_idx;
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bytes_written = uncomp_offset + uncomp_idx;
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// output header
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memcpy(out, "MIO0", 4);
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write_u32_be(&out[4], length);
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write_u32_be(&out[8], comp_offset);
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write_u32_be(&out[12], uncomp_offset);
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// output data
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memcpy(&out[MIO0_HEADER_LENGTH], bit_buf, bit_length);
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memcpy(&out[comp_offset], comp_buf, comp_idx);
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memcpy(&out[uncomp_offset], uncomp_buf, uncomp_idx);
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// free allocated buffers
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free(bit_buf);
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free(comp_buf);
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free(uncomp_buf);
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lookback_free(lookbacks);
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return bytes_written;
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}
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static FILE *mio0_open_out_file(const char *out_file) {
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if (strcmp(out_file, "-") == 0) {
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#if defined(_WIN32) || defined(_WIN64)
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_setmode(_fileno(stdout), _O_BINARY);
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#endif
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return stdout;
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} else {
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return fopen(out_file, "wb");
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}
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}
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int mio0_decode_file(const char *in_file, unsigned long offset, const char *out_file)
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{
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mio0_header_t head;
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FILE *in;
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FILE *out;
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unsigned char *in_buf = NULL;
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unsigned char *out_buf = NULL;
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long file_size;
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int ret_val = 0;
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size_t bytes_read;
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int bytes_decoded;
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int bytes_written;
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int valid;
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in = fopen(in_file, "rb");
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if (in == NULL) {
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return 1;
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}
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// allocate buffer to read from offset to end of file
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fseek(in, 0, SEEK_END);
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file_size = ftell(in);
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in_buf = malloc(file_size - offset);
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fseek(in, offset, SEEK_SET);
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// read bytes
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bytes_read = fread(in_buf, 1, file_size - offset, in);
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if (bytes_read != file_size - offset) {
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ret_val = 2;
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goto free_all;
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}
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// verify header
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valid = mio0_decode_header(in_buf, &head);
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if (!valid) {
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ret_val = 3;
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goto free_all;
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}
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out_buf = malloc(head.dest_size);
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// decompress MIO0 encoded data
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bytes_decoded = mio0_decode(in_buf, out_buf, NULL);
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if (bytes_decoded < 0) {
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ret_val = 3;
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goto free_all;
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}
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// open output file
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out = mio0_open_out_file(out_file);
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if (out == NULL) {
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ret_val = 4;
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goto free_all;
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}
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// write data to file
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bytes_written = fwrite(out_buf, 1, bytes_decoded, out);
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if (bytes_written != bytes_decoded) {
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ret_val = 5;
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}
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// clean up
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if (out != stdout) {
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fclose(out);
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}
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free_all:
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if (out_buf) {
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free(out_buf);
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}
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if (in_buf) {
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free(in_buf);
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}
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fclose(in);
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return ret_val;
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}
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int mio0_encode_file(const char *in_file, const char *out_file)
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{
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FILE *in;
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FILE *out;
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unsigned char *in_buf = NULL;
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unsigned char *out_buf = NULL;
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size_t file_size;
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size_t bytes_read;
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int bytes_encoded;
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int bytes_written;
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int ret_val = 0;
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in = fopen(in_file, "rb");
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if (in == NULL) {
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return 1;
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}
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// allocate buffer to read entire contents of files
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fseek(in, 0, SEEK_END);
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file_size = ftell(in);
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fseek(in, 0, SEEK_SET);
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in_buf = malloc(file_size);
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// read bytes
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bytes_read = fread(in_buf, 1, file_size, in);
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if (bytes_read != file_size) {
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ret_val = 2;
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goto free_all;
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}
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// allocate worst case length
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out_buf = malloc(MIO0_HEADER_LENGTH + ((file_size+7)/8) + file_size);
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// compress data in MIO0 format
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bytes_encoded = mio0_encode(in_buf, file_size, out_buf);
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// open output file
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out = mio0_open_out_file(out_file);
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if (out == NULL) {
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ret_val = 4;
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goto free_all;
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}
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// write data to file
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bytes_written = fwrite(out_buf, 1, bytes_encoded, out);
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if (bytes_written != bytes_encoded) {
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ret_val = 5;
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}
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// clean up
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if (out != stdout) {
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fclose(out);
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}
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free_all:
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if (out_buf) {
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free(out_buf);
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}
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if (in_buf) {
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free(in_buf);
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}
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fclose(in);
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return ret_val;
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}
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// mio0 standalone executable
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#ifdef MIO0_STANDALONE
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typedef struct
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{
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char *in_filename;
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char *out_filename;
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unsigned int offset;
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int compress;
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} arg_config;
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static arg_config default_config =
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{
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NULL,
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NULL,
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0,
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1
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};
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static void print_usage(void)
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{
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ERROR("Usage: mio0 [-c / -d] [-o OFFSET] FILE [OUTPUT]\n"
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"\n"
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"mio0 v" MIO0_VERSION ": MIO0 compression and decompression tool\n"
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"\n"
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"Optional arguments:\n"
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" -c compress raw data into MIO0 (default: compress)\n"
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" -d decompress MIO0 into raw data\n"
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" -o OFFSET starting offset in FILE (default: 0)\n"
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"\n"
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"File arguments:\n"
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" FILE input file\n"
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" [OUTPUT] output file (default: FILE.out), \"-\" for stdout\n");
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exit(1);
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}
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// parse command line arguments
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static void parse_arguments(int argc, char *argv[], arg_config *config)
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{
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int i;
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int file_count = 0;
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if (argc < 2) {
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print_usage();
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exit(1);
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}
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-' && argv[i][1] != '\0') {
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switch (argv[i][1]) {
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case 'c':
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config->compress = 1;
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break;
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case 'd':
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config->compress = 0;
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break;
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case 'o':
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if (++i >= argc) {
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print_usage();
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}
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config->offset = strtoul(argv[i], NULL, 0);
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break;
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default:
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print_usage();
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break;
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}
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} else {
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switch (file_count) {
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case 0:
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config->in_filename = argv[i];
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break;
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case 1:
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config->out_filename = argv[i];
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break;
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default: // too many
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print_usage();
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break;
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}
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file_count++;
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}
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}
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if (file_count < 1) {
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print_usage();
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}
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}
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int main(int argc, char *argv[])
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{
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char out_filename[FILENAME_MAX];
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arg_config config;
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int ret_val;
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// get configuration from arguments
|
|
config = default_config;
|
|
parse_arguments(argc, argv, &config);
|
|
if (config.out_filename == NULL) {
|
|
config.out_filename = out_filename;
|
|
sprintf(config.out_filename, "%s.out", config.in_filename);
|
|
}
|
|
|
|
// operation
|
|
if (config.compress) {
|
|
ret_val = mio0_encode_file(config.in_filename, config.out_filename);
|
|
} else {
|
|
ret_val = mio0_decode_file(config.in_filename, config.offset, config.out_filename);
|
|
}
|
|
|
|
switch (ret_val) {
|
|
case 1:
|
|
ERROR("Error opening input file \"%s\"\n", config.in_filename);
|
|
break;
|
|
case 2:
|
|
ERROR("Error reading from input file \"%s\"\n", config.in_filename);
|
|
break;
|
|
case 3:
|
|
ERROR("Error decoding MIO0 data. Wrong offset (0x%X)?\n", config.offset);
|
|
break;
|
|
case 4:
|
|
ERROR("Error opening output file \"%s\"\n", config.out_filename);
|
|
break;
|
|
case 5:
|
|
ERROR("Error writing bytes to output file \"%s\"\n", config.out_filename);
|
|
break;
|
|
}
|
|
|
|
return ret_val;
|
|
}
|
|
#endif // MIO0_STANDALONE
|
|
|