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py: Remove mp_obj_str_builder and use vstr instead.

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With this patch str/bytes construction is streamlined.  Always use a
vstr to build a str/bytes object.  If the size is known beforehand then
use vstr_init_len to allocate only required memory.  Otherwise use
vstr_init and the vstr will grow as needed.  Then use
mp_obj_new_str_from_vstr to create a str/bytes object using the vstr
memory.

Saves code ROM: 68 bytes on stmhal, 108 bytes on bare-arm, and 336 bytes
on unix x64.
This commit is contained in:
Damien George
2015-01-21 22:48:37 +00:00
parent 0b9ee86133
commit 05005f679e
18 changed files with 130 additions and 143 deletions
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8
extmod/moduhashlib.c
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@@ -63,10 +63,10 @@ MP_DEFINE_CONST_FUN_OBJ_2(hash_update_obj, hash_update);
STATIC mp_obj_t hash_digest(mp_obj_t self_in) {
mp_obj_hash_t *self = self_in;
byte *hash;
mp_obj_t o = mp_obj_str_builder_start(&mp_type_bytes, SHA256_BLOCK_SIZE, &hash);
sha256_final((SHA256_CTX*)self->state, hash);
return mp_obj_str_builder_end(o);
vstr_t vstr;
vstr_init_len(&vstr, SHA256_BLOCK_SIZE);
sha256_final((SHA256_CTX*)self->state, (byte*)vstr.buf);
return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
}
MP_DEFINE_CONST_FUN_OBJ_1(hash_digest_obj, hash_digest);