diff options
| -rw-r--r-- | libstore/decode.c | 73 |
1 files changed, 72 insertions, 1 deletions
diff --git a/libstore/decode.c b/libstore/decode.c index a809bf48..a6ef9e5e 100644 --- a/libstore/decode.c +++ b/libstore/decode.c @@ -24,13 +24,84 @@ #include "store.h" +/* Decodes the standard leaf device encoding that's common to various builtin + formats. */ +error_t +store_default_leaf_decode (struct store_enc *enc, struct store **store) +{ + char *misc; + error_t err; + int type, flags; + mach_port_t port; + size_t block_size, num_runs, name_len, misc_len; + + /* Make sure there are enough encoded ints and ports. */ + if (enc->cur_int + 6 > enc->ints_len || enc->cur_port + 1 > enc->ports_len) + return EINVAL; + + /* Read encoded ints. */ + type = enc->ints[enc->cur_int++]; + flags = enc->ints[enc->cur_int++]; + block_size = enc->ints[enc->cur_int++]; + num_runs = enc->ints[enc->cur_int++]; + name_len = enc->ints[enc->cur_int++]; + misc_len = enc->ints[enc->cur_int++]; + + /* Make sure there are enough encoded offsets and data. */ + if (enc->cur_offset + num_runs * 2 > enc->offsets_len + || enc->cur_data + name_len + misc_len > enc->data_len) + return EINVAL; + + if (ports->data[ports->cur_data + name_len - 1] != '\0') + return EINVAL; /* Name not terminated. */ + + misc = malloc (misc_len); + if (! misc) + return ENOMEM; + + /* Read encoded ports (be careful to deallocate this if we barf). */ + port = enc->ports[enc->cur_port++]; + + switch (type) + { + case STORAGE_DEVICE: + err = + _store_device_create (port, block_size, + ports->offsets + ports->curr_offset, num_runs, + store); + break; + case STORAGE_FILE: + err = + _store_file_create (port, block_size, + ports->offsets + ports->curr_offset, num_runs, + store); + break; + default: + err = EINVAL; + } + + if (err) + { + mach_port_deallocate (mach_task_self (), port); + free (misc); + } + else + { + (*store)->flags = flags; + (*store)->misc = misc; + (*store)->misc_len = misc_len; + } + + return err; +} + /* Decode ENC, either returning a new store in STORE, or an error. If nothing else is to be done with ENC, its contents may then be freed using store_enc_dealloc. */ error_t store_decode (struct store_enc *enc, struct store **store) { - if (enc->cur_ints >= enc->ints_len) + if (enc->cur_int >= enc->ints_len) /* The first int should always be the type. */ return EINVAL; |