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