mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
b01282e23e
This reduces the virtual memory usage of Emacs for me by 30%. We now have a simpler implementation that uses read(), rather mmap()ing the whole executable.
70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
#ifndef COSMOPOLITAN_ZIPOS_H_
|
|
#define COSMOPOLITAN_ZIPOS_H_
|
|
#include "libc/thread/thread.h"
|
|
#if !(__ASSEMBLER__ + __LINKER__ + 0)
|
|
COSMOPOLITAN_C_START_
|
|
|
|
#define ZIPOS_PATH_MAX 1024
|
|
|
|
#define ZIPOS_SYNTHETIC_DIRECTORY -2
|
|
|
|
struct stat;
|
|
struct iovec;
|
|
struct Zipos;
|
|
|
|
struct ZiposUri {
|
|
uint32_t len;
|
|
char path[ZIPOS_PATH_MAX];
|
|
};
|
|
|
|
struct ZiposHandle {
|
|
struct ZiposHandle *next;
|
|
struct Zipos *zipos;
|
|
int64_t handle; /* original upstream open()'d handle */
|
|
uint64_t size; /* accessible bytes stored at data[] */
|
|
uint64_t mapsize; /* the full byte size of this struct */
|
|
uint64_t pos; /* the file position, relative start */
|
|
int cfile; /* byte offset into zipos->cdir ents */
|
|
uint8_t data[]; /* original file content or dir name */
|
|
};
|
|
|
|
struct Zipos {
|
|
_Atomic(unsigned) once;
|
|
int cnt; /* element count, accessible via `index` */
|
|
int cdirsize; /* number of bytes accessible via `cdir` */
|
|
uint64_t dev; /* remembers st_dev, of zipos image file */
|
|
int *index; /* points to cdirsize+cnt*4 mmap'd bytes */
|
|
uint8_t *cdir; /* points after index, in the above mmap */
|
|
const char *progpath;
|
|
struct ZiposHandle *freelist;
|
|
char *mapend;
|
|
size_t maptotal;
|
|
pthread_mutex_t lock;
|
|
};
|
|
|
|
int __zipos_close(int);
|
|
void __zipos_lock(void);
|
|
void __zipos_unlock(void);
|
|
void __zipos_free(struct ZiposHandle *);
|
|
struct Zipos *__zipos_get(void) pureconst;
|
|
size_t __zipos_normpath(char *, const char *, size_t);
|
|
int __zipos_find(struct Zipos *, struct ZiposUri *);
|
|
int __zipos_scan(struct Zipos *, struct ZiposUri *);
|
|
ssize_t __zipos_parseuri(const char *, struct ZiposUri *);
|
|
uint64_t __zipos_inode(struct Zipos *, int64_t, const void *, size_t);
|
|
int __zipos_open(struct ZiposUri *, int);
|
|
int __zipos_access(struct ZiposUri *, int);
|
|
int __zipos_stat(struct ZiposUri *, struct stat *);
|
|
int __zipos_fstat(struct ZiposHandle *, struct stat *);
|
|
int __zipos_stat_impl(struct Zipos *, int, struct stat *);
|
|
ssize_t __zipos_read(struct ZiposHandle *, const struct iovec *, size_t,
|
|
ssize_t);
|
|
int64_t __zipos_seek(struct ZiposHandle *, int64_t, unsigned);
|
|
int __zipos_fcntl(int, int, uintptr_t);
|
|
int __zipos_notat(int, const char *);
|
|
void *__zipos_mmap(void *, uint64_t, int32_t, int32_t, struct ZiposHandle *,
|
|
int64_t);
|
|
|
|
COSMOPOLITAN_C_END_
|
|
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
|
|
#endif /* COSMOPOLITAN_ZIPOS_H_ */
|