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extmod/moduzlib: DecompIO: Add support for gzip-formatted streams. 

This uses extension introduced in CPython 3.5: if wbits (dictionary size
code) has value 16 + 8..15, it means that gzip-formatted stream expected.
This commit is contained in:
Paul Sokolovsky 2016-09-24 15:30:11 +03:00
parent d8a4d9d67c
commit 7b901d6fb7
1 changed files with 11 additions and 2 deletions
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13
extmod/moduzlib.c
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@ -81,10 +81,18 @@ STATIC mp_obj_t decompio_make_new(const mp_obj_type_t *type, size_t n_args, size
if (n_args > 1) {
dict_opt = mp_obj_get_int(args[1]);
}
if (dict_opt >= 0) {
if (dict_opt >= 16) {
int st = uzlib_gzip_parse_header(&o->decomp);
if (st != TINF_OK) {
goto header_error;
}
dict_sz = 1 << (dict_opt - 16);
} else if (dict_opt >= 0) {
dict_opt = uzlib_zlib_parse_header(&o->decomp);
if (dict_opt < 0) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "zlib header"));
header_error:
nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "compression header"));
}
dict_sz = 1 << dict_opt;
} else {
@ -212,6 +220,7 @@ const mp_obj_module_t mp_module_uzlib = {
#include "uzlib/tinflate.c"
#include "uzlib/tinfzlib.c"
#include "uzlib/tinfgzip.c"
#include "uzlib/adler32.c"
#include "uzlib/crc32.c"