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build: skip missing fseek64 on emscripten

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bnnm 2021-09-12 21:29:07 +02:00
parent 3fe5967764
commit b0ee80e21c
2 changed files with 51 additions and 5 deletions
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25
doc/BUILD.md
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@ -362,6 +362,31 @@ For integration and "API" usage, easiest would be checking how `vgmstream_cli.c`
A cleaner API/.h and build methods is planned for the future (low priority though).
# emscripten / wasm
It's possible to build vgmstream components with emscripten (in-browser support).
Follow emscripten's installation instructions:
- https://emscripten.org/docs/getting_started/downloads.html
- https://emscripten.org/docs/compiling/Building-Projects.html#building-projects
Then should be buildable on Linux (Windows should be possible too but has some issues at the moment), for example:
```
git clone https://github.com/vgmstream/vgmstream
cd vgmstream
mkdir -p build && cd build
# quickest example, some can be enabled
emcmake cmake -DBUILD_STATIC=ON -DUSE_JANSSON=OFF -DUSE_FFMPEG=OFF -DUSE_VORBIS=OFF -DUSE_MPEG=OFF -DUSE_G7221=OFF -DUSE_G719=OFF -DUSE_ATRAC9=OFF -DUSE_SPEEX=OFF -DUSE_MPEG=OFF -S .. -B .
emmake make
```
Or with the base makefiles (may need to rename output to .js ATM):
```
git clone https://github.com/vgmstream/vgmstream
cd vgmstream
make vgmstream-cli CC=emcc AR=emar strip=echo
```
## External libraries
Support for some codecs is done with external libs, instead of copying their code in vgmstream. There are various reasons for this:
- each lib may have complex or conflicting ways to compile that aren't simple to replicate

31
src/streamfile.c
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@ -7,6 +7,18 @@
#include <unistd.h>
#endif
/* For (rarely needed) +2GB file support we use fseek64/ftell64. Those are usually available
* but may depend on compiler.
* - MSVC: +VS2008 should work
* - GCC/MingW: should be available
* - GCC/Linux: should be available but some systems may need __USE_FILE_OFFSET64,
* that we (probably) don't want since that turns off_t to off64_t
* - Clang: seems only defined on Linux/GNU environments, somehow emscripten is out
* (unsure about Clang Win since apparently they define _MSC_VER)
* - Android: API +24 if not using __USE_FILE_OFFSET64
* Not sure if fopen64 is needed in some cases. May be work adding some compiler flag to control this manually.
*/
/* MSVC fixes (though mingw uses MSVCRT but not MSC_VER, maybe use AND?) */
#if defined(__MSVCRT__) || defined(_MSC_VER)
#include <io.h>
@ -20,8 +32,14 @@
#endif
*/
#define fseek_v _fseeki64 //fseek/fseeko
#define ftell_v _ftelli64 //ftell/ftello
#define fopen_v fopen
#if (_MSC_VER >= 1400)
#define fseek_v _fseeki64
#define ftell_v _ftelli64
#else
#define fseek_v fseek
#define ftell_v ftell
#endif
#ifdef fileno
#undef fileno
@ -34,10 +52,13 @@
#define off_t __int64
#endif
#elif defined(XBMC)
#elif defined(XBMC) || defined(__EMSCRIPTEN__) || defined (__ANDROID__)
#define fopen_v fopen
#define fseek_v fseek
#define ftell_v ftell
#else
#define fopen_v fopen
#define fseek_v fseeko64 //fseeko
#define ftell_v ftello64 //ftello
#endif
@ -252,7 +273,7 @@ static STREAMFILE* open_stdio_streamfile_buffer(const char* const filename, size
FILE* infile = NULL;
STREAMFILE* sf = NULL;
infile = fopen(filename,"rb");
infile = fopen_v(filename,"rb");
if (!infile) {
/* allow non-existing files in some cases */
if (!vgmstream_is_virtual_filename(filename))
@ -1471,7 +1492,7 @@ void dump_streamfile(STREAMFILE* sf, int num) {
get_streamfile_filename(sf, filename, sizeof(filename));
snprintf(dumpname, sizeof(dumpname), "%s_%02i.dump", filename, num);
f = fopen(dumpname,"wb");
f = fopen_v(dumpname,"wb");
if (!f) return;
}