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Very first cut of data decompression
This is a best effort implementation, mostly done with gazing at a hex editor and after the third beer. :) The decompressed .bsp maps are loading fine, but who knows if things are really correct...
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1 changed files with 91 additions and 2 deletions
93
pakextract.c
93
pakextract.c
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@ -178,10 +178,99 @@ read_directory(FILE *fd, int listOnly)
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static void extract_compressed(FILE* in, directory *d)
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{
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FILE *out;
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int offset;
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int read;
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int written;
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int x;
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int num;
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unsigned char *in_buf;
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unsigned char *out_buf;
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// TODO: implement according to https://gist.github.com/DanielGibson/8bde6241c93e5efe8b75e5e00d0b9858
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fprintf(stderr, "## TODO: Implement support for compressed files to extract '%s'!!\n", d->file_name);
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if ((out = fopen(d->file_name, "w")) == NULL)
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{
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perror("Couldn't open outputfile");
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return;
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}
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if ((in_buf = malloc(d->compressed_length)) == NULL)
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{
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perror("Couldn't allocate memory");
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return;
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}
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if ((out_buf = calloc(1, d->file_length)) == NULL)
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{
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perror("Couldn't allocate memory");
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return;
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}
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fseek(in, d->file_pos, SEEK_SET);
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fread(in_buf, d->compressed_length, 1, in);
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read = 0;
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written = 0;
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while (read < d->compressed_length)
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{
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x = in_buf[read];
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++read;
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// x + 1 bytes of uncompressed data
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if (x < 64)
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{
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num = x + 1;
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memmove(out_buf + written, in_buf + read, num);
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read += num;
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written += num;
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continue;
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}
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// x - 62 zeros
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else if (x < 128)
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{
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num = x - 62;
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memset(out_buf + written, 0, num);
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written += num;
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continue;
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}
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// x - 126 times the next byte
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else if (x < 192)
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{
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num = x - 126;
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memset(out_buf + written, in_buf[read], num);
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++read;
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written += num;
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continue;
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}
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// Reference previously uncompressed data
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else if (x < 254)
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{
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num = x - 190;
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offset = (int)in_buf[read] + 2;
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++read;
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memmove(out_buf + written, (out_buf + written) - offset, num);
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written += num;
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}
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// Terminate
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else if (x == 255)
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{
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break;
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}
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}
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fwrite(out_buf, d->file_length, 1, out);
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fclose(out);
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free(in_buf);
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free(out_buf);
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}
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#endif
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