esp-link/espfs/espfsformat.h

#ifndef ESPROFSFORMAT_H
#define ESPROFSFORMAT_H

/*
Stupid cpio-like tool to make read-only 'filesystems' that live on the flash SPI chip of the module.
Can (will) use lzf compression (when I come around to it) to make shit quicker. Aligns names, files,
headers on 4-byte boundaries so the SPI abstraction hardware in the ESP8266 doesn't crap on itself 
when trying to do a <4byte or unaligned read.
*/

/*
The idea 'borrows' from cpio: it's basically a concatenation of {header, filename, file} data.
Header, filename and file data is 32-bit aligned. The last file is indicated by data-less header
with the FLAG_LASTFILE flag set.
*/


#define FLAG_LASTFILE (1<<0)
#define FLAG_GZIP (1<<1)
#define COMPRESS_NONE 0
#define COMPRESS_HEATSHRINK 1
#define ESPFS_MAGIC 0x73665345

typedef struct {
	int32_t magic;
	int8_t flags;
	int8_t compression;
	int16_t nameLen;
	int32_t fileLenComp;
	int32_t fileLenDecomp;
} __attribute__((packed)) EspFsHeader;

#endif