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am e1b87e1a: am 48257704: Merge "libcutils: add fs_config_generate"

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* commit 'e1b87e1a0ee5d9b774fde68df8593b2fdeca4bb2':
  libcutils: add fs_config_generate
This commit is contained in:
Mark Salyzyn 2015-04-16 00:10:35 +00:00 • committed by Android Git Automerger
commit c130d96e9c
2 changed files with 23 additions and 0 deletions
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2
include/private/android_filesystem_config.h
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@ -215,6 +215,8 @@ __BEGIN_DECLS
void fs_config(const char *path, int dir, void fs_config(const char *path, int dir,
unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities); 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 __END_DECLS
#endif #endif

21
libcutils/fs_config.c
View file

@ -63,6 +63,8 @@ static inline uint64_t get8LE(const uint8_t* src)
return ((uint64_t) high << 32) | (uint64_t) low; return ((uint64_t) high << 32) | (uint64_t) low;
} }
#define ALIGN(x, alignment) ( ((x) + ((alignment) - 1)) & ~((alignment) - 1) )
/* Rules for directories. /* Rules for directories.
** These rules are applied based on "first match", so they ** These rules are applied based on "first match", so they
** should start with the most specific path and work their ** 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; *mode = (*mode & (~07777)) | pc->mode;
*capabilities = pc->capabilities; *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;
}