vgmstream/audacious/vfs.cc
2021-09-04 21:57:23 +02:00

121 lines
3.7 KiB
C++

#include <glib.h>
#include <cstdlib>
#include <libaudcore/plugin.h>
extern "C" {
#include "../src/vgmstream.h"
}
#include "plugin.h"
#include "vfs.h"
typedef struct {
STREAMFILE sf;
VFSFile *vfsFile;
offv_t offset;
char name[32768];
} VFS_STREAMFILE;
static STREAMFILE *open_vfs_by_VFSFILE(VFSFile *file, const char *path);
static size_t read_vfs(VFS_STREAMFILE *streamfile, uint8_t *dest, offv_t offset, size_t length) {
size_t bytes_read;
if (/*!streamfile->vfsFile ||*/ !dest || length <= 0 || offset < 0)
return 0;
// if the offsets don't match, then we need to perform a seek
if (streamfile->offset != offset) {
int ok = streamfile->vfsFile->fseek(offset, VFS_SEEK_SET);
if (ok != 0) return 0;
streamfile->offset = offset;
}
bytes_read = streamfile->vfsFile->fread(dest, 1, length);
streamfile->offset += bytes_read;
return bytes_read;
}
static void close_vfs(VFS_STREAMFILE *streamfile) {
//if (streamfile->vfsFile)
delete streamfile->vfsFile; //fcloses the internal file too
free(streamfile);
}
static size_t get_size_vfs(VFS_STREAMFILE *streamfile) {
//if (!streamfile->vfsFile)
// return 0;
return streamfile->vfsFile->fsize();
}
static size_t get_offset_vfs(VFS_STREAMFILE *streamfile) {
return streamfile->offset;
}
static void get_name_vfs(VFS_STREAMFILE *streamfile, char *buffer, size_t length) {
strncpy(buffer, streamfile->name, length);
buffer[length - 1] = '\0';
}
static STREAMFILE *open_vfs_impl(VFS_STREAMFILE *streamfile, const char *const filename, size_t buffersize) {
if (!filename)
return NULL;
return open_vfs(filename);
}
STREAMFILE *open_vfs_by_VFSFILE(VFSFile *file, const char *path) {
VFS_STREAMFILE *streamfile = (VFS_STREAMFILE *)malloc(sizeof(VFS_STREAMFILE));
if (!streamfile)
return NULL;
// success, set our pointers
memset(streamfile, 0, sizeof(VFS_STREAMFILE));
streamfile->sf.read = (size_t (*)(STREAMFILE *, uint8_t *, offv_t, size_t))read_vfs;
streamfile->sf.get_size = (size_t (*)(STREAMFILE *))get_size_vfs;
streamfile->sf.get_offset = (offv_t (*)(STREAMFILE *))get_offset_vfs;
streamfile->sf.get_name = (void (*)(STREAMFILE *, char *, size_t))get_name_vfs;
streamfile->sf.open = (STREAMFILE *(*)(STREAMFILE *, const char *, size_t))open_vfs_impl;
streamfile->sf.close = (void (*)(STREAMFILE *))close_vfs;
streamfile->vfsFile = file;
streamfile->offset = 0;
strncpy(streamfile->name, path, sizeof(streamfile->name));
streamfile->name[sizeof(streamfile->name) - 1] = '\0';
// for reference, actual file path ("name" has protocol path, file://...).
// name should work for all situations but in case it's needed again maybe
// get_name should always return realname, as it's used to open companion VFSFiles
//{
// gchar *realname = g_filename_from_uri(path, NULL, NULL);
// strncpy(streamfile->realname, realname, sizeof(streamfile->realname));
// streamfile->realname[sizeof(streamfile->realname) - 1] = '\0';
// g_free(realname);
//}
return &streamfile->sf;
}
STREAMFILE *open_vfs(const char *path) {
VFSFile *vfsFile = new VFSFile(path, "rb");
if (!vfsFile || !*vfsFile) {
delete vfsFile;
return NULL;
}
#if 0 // files that don't exist seem blocked by probe.cc before reaching here
bool infile_exists = vfsFile && *vfsFile;
if (!infile_exists) {
/* allow non-existing files in some cases */
if (!vgmstream_is_virtual_filename(path)) {
delete vfsFile;
return NULL;
}
vfsFile = NULL;
}
#endif
return open_vfs_by_VFSFILE(vfsFile, path);
}