moduzlib: New zlib-like module, based on uzlib.

extmod/moduzlib.c

+/*
+ * This file is part of the Micro Python project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2014 Paul Sokolovsky
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <time.h>
+#include <sys/time.h>
+#include <math.h>
+
+#include "mpconfig.h"
+#include "misc.h"
+#include "qstr.h"
+#include "nlr.h"
+#include "obj.h"
+#include "runtime.h"
+
+#if MICROPY_PY_UZLIB
+
+#include "uzlib/tinf.h"
+
+#if 0 // print debugging info
+#define DEBUG_printf DEBUG_printf
+#else // don't print debugging info
+#define DEBUG_printf(...) (void)0
+#endif
+
+STATIC int mod_uzlib_grow_buf(TINF_DATA *d, unsigned alloc_req)
+{
+    if (alloc_req < 256) {
+        alloc_req = 256;
+    }
+    DEBUG_printf("uzlib: Resizing buffer to " UINT_FMT " bytes\n", d->destSize + alloc_req);
+    d->destStart = m_renew(byte, d->destStart, d->destSize, d->destSize + alloc_req);
+    d->destSize += alloc_req;
+    return 0;
+}
+
+STATIC mp_obj_t mod_uzlib_decompress(uint n_args, mp_obj_t *args) {
+    mp_obj_t data = args[0];
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
+
+    TINF_DATA *decomp = m_new_obj(TINF_DATA);
+    DEBUG_printf("sizeof(TINF_DATA)=" UINT_FMT "\n", sizeof(*decomp));
+
+    decomp->destStart = m_new(byte, bufinfo.len);
+    decomp->destSize = bufinfo.len;
+    decomp->destGrow = mod_uzlib_grow_buf;
+    decomp->source = bufinfo.buf;
+
+    int st = tinf_zlib_uncompress_dyn(decomp, bufinfo.len);
+    if (st != 0) {
+        nlr_raise(mp_obj_new_exception_arg1(&mp_type_ValueError, MP_OBJ_NEW_SMALL_INT(st)));
+    }
+
+    mp_obj_t res = mp_obj_new_bytearray_by_ref(decomp->dest - decomp->destStart, decomp->destStart);
+    m_del_obj(TINF_DATA, decomp);
+    return res;
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_uzlib_decompress_obj, 1, 3, mod_uzlib_decompress);
+
+STATIC const mp_map_elem_t mp_module_uzlib_globals_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_uzlib) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_decompress), (mp_obj_t)&mod_uzlib_decompress_obj },
+};
+
+STATIC const mp_obj_dict_t mp_module_uzlib_globals = {
+    .base = {&mp_type_dict},
+    .map = {
+        .all_keys_are_qstrs = 1,
+        .table_is_fixed_array = 1,
+        .used = MP_ARRAY_SIZE(mp_module_uzlib_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_uzlib_globals_table),
+        .table = (mp_map_elem_t*)mp_module_uzlib_globals_table,
+    },
+};
+
+const mp_obj_module_t mp_module_uzlib = {
+    .base = { &mp_type_module },
+    .name = MP_QSTR_uzlib,
+    .globals = (mp_obj_dict_t*)&mp_module_uzlib_globals,
+};
+
+// Source files #include'd here to make sure they're compiled in
+// only if module is enabled by config setting.
+
+#include "uzlib/tinflate.c"
+#include "uzlib/tinfzlib.c"
+#include "uzlib/adler32.c"
+
+#endif //MICROPY_PY_UZLIB