ported double tracking from TC

deps/libmpq/FAQ

@@ -0,0 +1,68 @@
+FAQ - Frequently Asked Questions
+================================
+
+Q: What is libmpq?
+A: libmpq is a library for manipulating MoPaQ mpq archives mostly used
+   used by Blizzard in their games.
+
+Q: What can i do with libmpq?
+A: With libmpq you can write applications which can extract, create
+   and manipulate mpq archives.
+
+Q: Is it legal?
+A: Yes, i think so. I have no idea why it should not, all informations
+   about the fileformat are available.
+
+Q: Is there a description of the functions?
+A: Since version 0.4.0 libmpq comes with a API documentation for
+   developers. The documentation is written as manual pages.
+
+Q: Can i help?
+A: Yes, help is needed, not only with developing, also with testing.
+   A good point to start is using a recent SVN version of libmpq and
+   trying to use it with every mpq archive you could get :)
+
+Q: Can you give a small example to demonstrate the usage?
+A: Of course :) The example below takes first parameter as mpq archive
+   and extracts the first file to a buffer.
+
+   /*
+    *  Compile with:
+    *
+    *  x86_32:
+    *
+    *  gcc \
+    *    -D_FILE_OFFSET_BITS=64 \
+    *    -D_LARGE_FILES=1 \
+    *    -D_LARGEFILE_SOURCE=1 \
+    *    mpq-example.c -o mpq-example -lmpq -lz -lbz2 -I/usr/local/include/libmpq
+    *
+    *  x86_64:
+    *
+    *  gcc \
+    *    -D_LARGE_FILES=1 \
+    *    mpq-example.c -o mpq-example -lmpq -lz -lbz2 -I/usr/local/include/libmpq
+    */
+
+   #include <mpq.h>
+   #include <stdlib.h>
+   #include <limits.h>
+
+   int main(int argc, char **argv) {
+           mpq_archive_s *mpq_archive;
+           off_t out_size;
+           char *out_buf;
+
+           /* open the mpq archive given as first parameter. */
+           libmpq__archive_open(&mpq_archive, argv[1], -1);
+
+           /* get size of first file (0) and malloc output buffer. */
+           libmpq__file_unpacked_size(mpq_archive, 0, &out_size);
+           out_buf = malloc(out_size);
+
+           /* read, decrypt and unpack file to output buffer. */
+           libmpq__file_read(mpq_archive, 0, out_buf, out_size, NULL);
+
+           /* close the mpq archive. */
+           libmpq__archive_close(mpq_archive);
+   }