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#ifndef VFS_H
#define VFS_H
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef struct {
char path[256];
uint64_t offset;
uint64_t size;
} VfsEntry;
typedef struct {
char magic[4];
uint32_t num_files;
} VfsHeader;
typedef struct {
FILE* f;
uint64_t start;
uint64_t size;
uint64_t pos;
int is_pak;
} VfsFile;
void vfs_init(const char* pak_path);
void vfs_shutdown(void);
// Basic API
void* vfs_read(const char* path, size_t* out_size);
void vfs_free(void* data);
// Extended API for VFS-like behavior
VfsFile* vfs_open(const char* path);
size_t vfs_fread(void* ptr, size_t size, size_t nmemb, VfsFile* file);
int vfs_fseek(VfsFile* file, int64_t offset, int whence);
int64_t vfs_ftell(VfsFile* file);
void vfs_fclose(VfsFile* file);
#ifdef VFS_IMPLEMENTATION
#include <errno.h>
// Note: These must be defined in the implementation file or all.h
// LOG_INFO, LOG_ERROR, LOG_WARN, log_message
// If you don't have them, you can define fallbacks here.
static VfsEntry* g_entries = NULL;
static uint32_t g_num_entries = 0;
static char g_pak_path[512] = {0};
static int g_disk_mode = 0;
void vfs_init(const char* pak_path) {
const char* debug_env = getenv("DEBUG");
if (debug_env && (strcmp(debug_env, "1") == 0 || strcmp(debug_env, "true") == 0)) {
g_disk_mode = 1;
log_message(stdout, LOG_INFO, "VFS: Operating in Disk Mode (DEBUG enabled)");
return;
}
FILE* f = fopen(pak_path, "rb");
if (!f) {
log_message(stderr, LOG_ERROR, "VFS: Failed to open pak file: %s (Error: %s)", pak_path, strerror(errno));
log_message(stderr, LOG_WARN, "VFS: Falling back to Disk Mode");
g_disk_mode = 1;
return;
}
VfsHeader header;
if (fread(&header, sizeof(VfsHeader), 1, f) != 1) {
log_message(stderr, LOG_ERROR, "VFS: Failed to read header from %s", pak_path);
fclose(f);
g_disk_mode = 1;
return;
}
if (memcmp(header.magic, "DRP1", 4) != 0) {
log_message(stderr, LOG_ERROR, "VFS: Invalid magic in %s", pak_path);
fclose(f);
g_disk_mode = 1;
return;
}
g_num_entries = header.num_files;
g_entries = (VfsEntry*)malloc(sizeof(VfsEntry) * g_num_entries);
if (fread(g_entries, sizeof(VfsEntry), g_num_entries, f) != g_num_entries) {
log_message(stderr, LOG_ERROR, "VFS: Failed to read index table from %s", pak_path);
free(g_entries);
g_entries = NULL;
fclose(f);
g_disk_mode = 1;
return;
}
fclose(f);
strncpy(g_pak_path, pak_path, sizeof(g_pak_path) - 1);
log_message(stdout, LOG_INFO, "VFS: Loaded %u files from %s", g_num_entries, pak_path);
}
void vfs_shutdown(void) {
if (g_entries) {
free(g_entries);
g_entries = NULL;
}
}
VfsFile* vfs_open(const char* path) {
if (g_disk_mode) {
FILE* f = fopen(path, "rb");
if (!f) return NULL;
VfsFile* vf = (VfsFile*)malloc(sizeof(VfsFile));
vf->f = f;
fseek(f, 0, SEEK_END);
vf->size = ftell(f);
fseek(f, 0, SEEK_SET);
vf->start = 0;
vf->pos = 0;
vf->is_pak = 0;
return vf;
}
for (uint32_t i = 0; i < g_num_entries; i++) {
if (strcmp(g_entries[i].path, path) == 0) {
FILE* f = fopen(g_pak_path, "rb");
if (!f) return NULL;
VfsFile* vf = (VfsFile*)malloc(sizeof(VfsFile));
vf->f = f;
vf->start = g_entries[i].offset;
vf->size = g_entries[i].size;
vf->pos = 0;
vf->is_pak = 1;
fseek(f, (long)vf->start, SEEK_SET);
return vf;
}
}
log_message(stderr, LOG_WARN, "VFS: File not found: %s", path);
return NULL;
}
size_t vfs_fread(void* ptr, size_t size, size_t nmemb, VfsFile* file) {
size_t total_to_read = size * nmemb;
if (file->pos + total_to_read > file->size) {
total_to_read = (size_t)(file->size - file->pos);
}
if (total_to_read <= 0) return 0;
size_t read_bytes = fread(ptr, 1, total_to_read, file->f);
file->pos += read_bytes;
return read_bytes / size;
}
int vfs_fseek(VfsFile* file, int64_t offset, int whence) {
int64_t new_pos;
switch (whence) {
case SEEK_SET: new_pos = offset; break;
case SEEK_CUR: new_pos = (int64_t)file->pos + offset; break;
case SEEK_END: new_pos = (int64_t)file->size + offset; break;
default: return -1;
}
if (new_pos < 0) new_pos = 0;
if (new_pos > (int64_t)file->size) new_pos = (int64_t)file->size;
file->pos = (uint64_t)new_pos;
return fseek(file->f, (long)(file->start + file->pos), SEEK_SET);
}
int64_t vfs_ftell(VfsFile* file) {
return (int64_t)file->pos;
}
void vfs_fclose(VfsFile* file) {
if (file->f) fclose(file->f);
free(file);
}
void* vfs_read(const char* path, size_t* out_size) {
VfsFile* f = vfs_open(path);
if (!f) return NULL;
void* data = malloc((size_t)f->size);
if (!data) {
vfs_fclose(f);
return NULL;
}
if (vfs_fread(data, 1, (size_t)f->size, f) != f->size) {
free(data);
vfs_fclose(f);
return NULL;
}
if (out_size) *out_size = (size_t)f->size;
vfs_fclose(f);
return data;
}
void vfs_free(void* data) {
free(data);
}
#endif // VFS_IMPLEMENTATION
#endif // VFS_H
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