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Commit 5d9e5efb authored by Mark Salyzyn's avatar Mark Salyzyn
Browse files

libcutils: add fs_config_generate 

Bug: 19908228
Change-Id: Icb0e189a86758bb779b9bdf7c0d92216d297869f
parent 68651148

include/private/android_filesystem_config.h

+2 −0
Original line number Diff line number Diff line
@@ -215,6 +215,8 @@ __BEGIN_DECLS 
void fs_config(const char *path, int dir,

               unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities);



ssize_t fs_config_generate(char *buffer, size_t length, const struct fs_path_config *pc);



__END_DECLS



#endif

libcutils/fs_config.c

+21 −0
Original line number Diff line number Diff line
@@ -63,6 +63,8 @@ static inline uint64_t get8LE(const uint8_t* src) 
    return ((uint64_t) high << 32) | (uint64_t) low;

}



#define ALIGN(x, alignment) ( ((x) + ((alignment) - 1)) & ~((alignment) - 1) )



/* Rules for directories.

** These rules are applied based on "first match", so they

** should start with the most specific path and work their
@@ -261,3 +263,22 @@ void fs_config(const char *path, int dir, 
    *mode = (*mode & (~07777)) | pc->mode;

    *capabilities = pc->capabilities;

}



ssize_t fs_config_generate(char *buffer, size_t length, const struct fs_path_config *pc)

{

    struct fs_path_config_from_file *p = (struct fs_path_config_from_file *)buffer;

    size_t len = ALIGN(sizeof(*p) + strlen(pc->prefix) + 1, sizeof(uint64_t));



    if ((length < len) || (len > UINT16_MAX)) {

        return -ENOSPC;

    }

    memset(p, 0, len);

    uint16_t host_len = len;

    p->len = get2LE((const uint8_t *)&host_len);

    p->mode = get2LE((const uint8_t *)&(pc->mode));

    p->uid = get2LE((const uint8_t *)&(pc->uid));

    p->gid = get2LE((const uint8_t *)&(pc->gid));

    p->capabilities = get8LE((const uint8_t *)&(pc->capabilities));

    strcpy(p->prefix, pc->prefix);

    return len;

}