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Support reading and writing ESP32 file timestamps stored in the metadata #67

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Support reading and writing ESP32 file timestamps stored in the metadata #67

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16d9570
Support reading and writing ESP32 file timestamps stored in the metadata
ewpa May 20, 2019
b593dc7
When interchanging file modified timestamps to and from the host system
ewpa May 22, 2019
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26 changes: 26 additions & 0 deletions main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -13,6 +13,7 @@
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <utime.h>
#include <unistd.h>
#include <cstring>
#include <string>
Expand All @@ -25,6 +26,12 @@
#include <direct.h>
#endif

#if CONFIG_SPIFFS_USE_MTIME
#if SPIFFS_OBJ_META_LEN != 4
#error You must set both CONFIG_SPIFFS_USE_MTIME=1 and CONFIG_SPIFFS_META_LENGTH=4 for ESP IDF MTIME compatibility.
#endif
#endif

static std::vector<uint8_t> s_flashmem;

static std::string s_dirName;
Expand Down Expand Up @@ -154,6 +161,16 @@ int addFile(char* name, const char* path)
std::cout << "file size: " << size << std::endl;
}

// read and update file modification time
#if CONFIG_SPIFFS_USE_MTIME
struct stat sbuff;
stat(path, &sbuff);
uint8_t meta[4]; // mtime is stored in the meta character array in little-endian order
meta[0] = sbuff.st_mtime & 0xFF; meta[1] = (sbuff.st_mtime>>8) & 0xFF;
meta[2] = (sbuff.st_mtime>>16) & 0xFF; meta[3] = (sbuff.st_mtime>>24) & 0xFF;
SPIFFS_fupdate_meta(&s_fs, dst, meta);
#endif

size_t left = size;
uint8_t data_byte;
while (left > 0) {
Expand Down Expand Up @@ -369,6 +386,15 @@ bool unpackFile(spiffs_dirent *spiffsFile, const char *destPath)
// Close file.
fclose(dst);

// Update file modification time.
#if CONFIG_SPIFFS_USE_MTIME
spiffs_stat sstat;
SPIFFS_stat(&s_fs, (const char*)spiffsFile->name, &sstat);
uint32_t meta = (sstat.meta[0]<<0) | (sstat.meta[1]<<8) | (sstat.meta[2]<<16) | (sstat.meta[3]<<24); // mtime is retrieved from the meta character array in little-endian order
struct utimbuf times;
times.actime = times.modtime = meta;
utime(destPath, &times);
#endif

return true;
}
Expand Down