401 lines
8.8 KiB
C++
401 lines
8.8 KiB
C++
/*
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* This file is part of the DXX-Rebirth project <http://www.dxx-rebirth.com/>.
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* It is copyright by its individual contributors, as recorded in the
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* project's Git history. See COPYING.txt at the top level for license
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* terms and a link to the Git history.
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*/
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#include <string.h> // for mem* functions
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#if !defined(_WIN32) && !defined(macintosh)
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#endif
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#include "mvelib.h"
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#include "compiler-make_unique.h"
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static const char MVE_HEADER[] = "Interplay MVE File\x1A";
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static const short MVE_HDRCONST1 = 0x001A;
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static const short MVE_HDRCONST2 = 0x0100;
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static const short MVE_HDRCONST3 = 0x1133;
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mve_cb_Read mve_read;
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mve_cb_Alloc mve_alloc;
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mve_cb_Free mve_free;
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mve_cb_ShowFrame mve_showframe;
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mve_cb_SetPalette mve_setpalette;
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/*
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* private utility functions
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*/
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static int16_t _mve_get_short(const unsigned char *data);
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static uint16_t _mve_get_ushort(const unsigned char *data);
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/*
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* private functions for mvefile
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*/
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static int _mvefile_open(MVEFILE *movie, void *stream);
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static int _mvefile_read_header(const MVEFILE *movie);
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static void _mvefile_set_buffer_size(MVEFILE *movie, std::size_t buf_size);
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static int _mvefile_fetch_next_chunk(MVEFILE *movie);
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/*
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* private functions for mvestream
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*/
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static int _mvestream_open(MVESTREAM *movie, void *stream);
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static void _mvestream_reset(MVESTREAM *movie);
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/************************************************************
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* public MVEFILE functions
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************************************************************/
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/*
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* open an MVE file
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*/
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std::unique_ptr<MVEFILE> mvefile_open(void *stream)
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{
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/* create the file */
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auto file = make_unique<MVEFILE>();
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if (! _mvefile_open(file.get(), stream))
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{
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return nullptr;
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}
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/* initialize the file */
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_mvefile_set_buffer_size(file.get(), 1024);
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/* verify the file's header */
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if (! _mvefile_read_header(file.get()))
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{
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return nullptr;
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}
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/* now, prefetch the next chunk */
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_mvefile_fetch_next_chunk(file.get());
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return file;
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}
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/*
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* reset a MVE file
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*/
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static void mvefile_reset(MVEFILE *file)
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{
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/* initialize the file */
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_mvefile_set_buffer_size(file, 1024);
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/* verify the file's header */
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if (! _mvefile_read_header(file))
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{
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*file = {};
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}
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/* now, prefetch the next chunk */
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_mvefile_fetch_next_chunk(file);
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}
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static bool have_segment_header(const MVEFILE *movie)
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{
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/* if nothing is cached, fail */
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if (movie->next_segment >= movie->cur_chunk.size())
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return false;
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/* if we don't have enough data to get a segment, fail */
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if (movie->cur_chunk.size() - movie->next_segment < 4)
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return false;
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return true;
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}
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/*
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* get the size of the next segment
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*/
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int_fast32_t mvefile_get_next_segment_size(const MVEFILE *movie)
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{
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if (!have_segment_header(movie))
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return -1;
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/* otherwise, get the data length */
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return _mve_get_short(&movie->cur_chunk[movie->next_segment]);
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}
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/*
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* get type of next segment in chunk (0xff if no more segments in chunk)
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*/
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unsigned char mvefile_get_next_segment_major(const MVEFILE *movie)
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{
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if (!have_segment_header(movie))
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return 0xff;
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/* otherwise, get the data length */
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return movie->cur_chunk[movie->next_segment + 2];
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}
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/*
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* get subtype (version) of next segment in chunk (0xff if no more segments in
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* chunk)
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*/
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unsigned char mvefile_get_next_segment_minor(const MVEFILE *movie)
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{
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if (!have_segment_header(movie))
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return 0xff;
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/* otherwise, get the data length */
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return movie->cur_chunk[movie->next_segment + 3];
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}
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/*
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* see next segment (return NULL if no next segment)
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*/
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const unsigned char *mvefile_get_next_segment(const MVEFILE *movie)
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{
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if (!have_segment_header(movie))
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return NULL;
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/* otherwise, get the data length */
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return &movie->cur_chunk[movie->next_segment + 4];
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}
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/*
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* advance to next segment
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*/
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void mvefile_advance_segment(MVEFILE *movie)
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{
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if (!have_segment_header(movie))
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return;
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/* else, advance to next segment */
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movie->next_segment +=
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(4 + _mve_get_ushort(&movie->cur_chunk[movie->next_segment]));
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}
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/*
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* fetch the next chunk (return 0 if at end of stream)
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*/
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int mvefile_fetch_next_chunk(MVEFILE *movie)
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{
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return _mvefile_fetch_next_chunk(movie);
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}
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/************************************************************
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* public MVESTREAM functions
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************************************************************/
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/*
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* open an MVE stream
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*/
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MVESTREAM_ptr_t mve_open(void *stream)
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{
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/* allocate */
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auto movie = make_unique<MVESTREAM>();
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/* open */
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if (! _mvestream_open(movie.get(), stream))
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{
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return nullptr;
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}
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return MVESTREAM_ptr_t(movie.release());
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}
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/*
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* reset an MVE stream
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*/
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void mve_reset(MVESTREAM *movie)
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{
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_mvestream_reset(movie);
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}
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/*
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* set segment type handler
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*/
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void mve_set_handler(MVESTREAM *movie, unsigned char major, MVESEGMENTHANDLER handler)
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{
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if (major < 32)
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movie->handlers[major] = handler;
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}
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/*
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* set segment handler context
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*/
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void mve_set_handler_context(MVESTREAM *movie, void *context)
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{
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movie->context = context;
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}
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/*
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* play next chunk
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*/
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int mve_play_next_chunk(MVESTREAM *movie)
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{
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/* loop over segments */
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auto major = mvefile_get_next_segment_major(movie->movie.get());
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while (major != 0xff)
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{
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/* check whether to handle the segment */
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if (major < movie->handlers.size() && movie->handlers[major])
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{
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auto minor = mvefile_get_next_segment_minor(movie->movie.get());
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auto len = mvefile_get_next_segment_size(movie->movie.get());
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auto data = mvefile_get_next_segment(movie->movie.get());
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if (! movie->handlers[major](major, minor, data, len, movie->context))
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return 0;
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}
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/* advance to next segment */
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mvefile_advance_segment(movie->movie.get());
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major = mvefile_get_next_segment_major(movie->movie.get());
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}
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if (! mvefile_fetch_next_chunk(movie->movie.get()))
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return 0;
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/* return status */
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return 1;
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}
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/************************************************************
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* private functions
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************************************************************/
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/*
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* allocate an MVEFILE
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*/
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MVEFILE::MVEFILE() :
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stream(nullptr),
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next_segment(0)
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{
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}
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/*
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* free an MVE file
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*/
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MVEFILE::~MVEFILE()
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{
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}
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/*
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* open the file stream in thie object
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*/
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static int _mvefile_open(MVEFILE *file, void *stream)
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{
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file->stream = stream;
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if (! file->stream)
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return 0;
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return 1;
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}
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/*
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* read and verify the header of the recently opened file
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*/
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static int _mvefile_read_header(const MVEFILE *movie)
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{
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unsigned char buffer[26];
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/* check the file is open */
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if (! movie->stream)
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return 0;
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/* check the file is long enough */
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if (! mve_read(movie->stream, buffer, 26))
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return 0;
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/* check the signature */
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if (memcmp(buffer, MVE_HEADER, 20))
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return 0;
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/* check the hard-coded constants */
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if (_mve_get_short(buffer+20) != MVE_HDRCONST1)
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return 0;
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if (_mve_get_short(buffer+22) != MVE_HDRCONST2)
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return 0;
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if (_mve_get_short(buffer+24) != MVE_HDRCONST3)
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return 0;
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return 1;
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}
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static void _mvefile_set_buffer_size(MVEFILE *movie, std::size_t buf_size)
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{
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/* check if this would be a redundant operation */
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if (buf_size <= movie->cur_chunk.size())
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return;
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/* allocate new buffer */
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/* copy old data */
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/* free old buffer */
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/* install new buffer */
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movie->cur_chunk.resize(100 + buf_size);
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}
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static int _mvefile_fetch_next_chunk(MVEFILE *movie)
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{
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unsigned char buffer[4];
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unsigned short length;
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/* fail if not open */
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if (! movie->stream)
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return 0;
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/* fail if we can't read the next segment descriptor */
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if (! mve_read(movie->stream, buffer, 4))
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return 0;
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/* pull out the next length */
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length = _mve_get_short(buffer);
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/* make sure we've got sufficient space */
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_mvefile_set_buffer_size(movie, length);
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/* read the chunk */
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if (! mve_read(movie->stream, &movie->cur_chunk[0], length))
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return 0;
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movie->cur_chunk.resize(length);
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movie->next_segment = 0;
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return 1;
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}
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static int16_t _mve_get_short(const unsigned char *data)
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{
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short value;
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value = data[0] | (data[1] << 8);
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return value;
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}
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static uint16_t _mve_get_ushort(const unsigned char *data)
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{
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unsigned short value;
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value = data[0] | (data[1] << 8);
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return value;
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}
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/*
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* allocate an MVESTREAM
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*/
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MVESTREAM::MVESTREAM() :
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/* allocate and zero-initialize everything */
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movie(nullptr),
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context(0),
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handlers{}
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{
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}
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MVESTREAM::~MVESTREAM()
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{
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}
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/*
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* open an MVESTREAM object
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*/
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static int _mvestream_open(MVESTREAM *movie, void *stream)
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{
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movie->movie = mvefile_open(stream);
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return (movie->movie == NULL) ? 0 : 1;
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}
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/*
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* reset an MVESTREAM
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*/
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static void _mvestream_reset(MVESTREAM *movie)
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{
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mvefile_reset(movie->movie.get());
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}
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