modzlibd: Decompress part of "zlib" module, based on miniz tinfl.c .

extmod/modzlibd.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 "obj.h"
+#include "runtime.h"
+
+#if MICROPY_PY_ZLIBD
+
+#include "miniz/tinfl.c"
+
+#if 0 // print debugging info
+#define DEBUG_printf DEBUG_printf
+#else // don't print debugging info
+#define DEBUG_printf(...) (void)0
+#endif
+
+STATIC mp_obj_t mod_zlib_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);
+    tinfl_decompressor *decomp = m_new_obj(tinfl_decompressor);
+    tinfl_init(decomp);
+    DEBUG_printf("sizeof(tinfl_decompressor)=%d\n", sizeof(tinfl_decompressor));
+
+    byte *out = m_new(byte, bufinfo.len);
+    size_t out_len = bufinfo.len;
+    size_t in_buf_ofs = 0, dst_buf_ofs = 0;
+    size_t dst_buf_sz = bufinfo.len;
+
+    while (1) {
+        size_t in_buf_sz = bufinfo.len - in_buf_ofs;
+        DEBUG_printf("tinfl in: in_ofs=%d in_sz=%d dst_ofs=%d, dst_sz=%d\n", in_buf_ofs, in_buf_sz, dst_buf_ofs, dst_buf_sz);
+        tinfl_status st = tinfl_decompress(decomp,
+            bufinfo.buf + in_buf_ofs, &in_buf_sz,
+            out, out + dst_buf_ofs, &dst_buf_sz,
+            TINFL_FLAG_USING_NON_WRAPPING_OUTPUT_BUF | TINFL_FLAG_PARSE_ZLIB_HEADER);
+        DEBUG_printf("tinfl out: st=%d, in_sz=%d, out_sz=%d\n", st, in_buf_sz, dst_buf_sz);
+        in_buf_ofs += in_buf_sz;
+        dst_buf_ofs += dst_buf_sz;
+        if (st != TINFL_STATUS_HAS_MORE_OUTPUT) {
+            break;
+        }
+        out = m_renew(byte, out, out_len, dst_buf_ofs + 256);
+        out_len = dst_buf_ofs + 256;
+        dst_buf_sz = out_len - dst_buf_ofs;
+    }
+
+    m_del_obj(tinfl_decompressor, decomp);
+    return mp_obj_new_bytearray_by_ref(dst_buf_ofs, out);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_zlib_decompress_obj, 1, 3, mod_zlib_decompress);
+
+STATIC const mp_map_elem_t mp_module_zlib_globals_table[] = {
+    { MP_OBJ_NEW_QSTR(MP_QSTR___name__), MP_OBJ_NEW_QSTR(MP_QSTR_zlibd) },
+    { MP_OBJ_NEW_QSTR(MP_QSTR_decompress), (mp_obj_t)&mod_zlib_decompress_obj },
+};
+
+STATIC const mp_obj_dict_t mp_module_zlib_globals = {
+    .base = {&mp_type_dict},
+    .map = {
+        .all_keys_are_qstrs = 1,
+        .table_is_fixed_array = 1,
+        .used = MP_ARRAY_SIZE(mp_module_zlib_globals_table),
+        .alloc = MP_ARRAY_SIZE(mp_module_zlib_globals_table),
+        .table = (mp_map_elem_t*)mp_module_zlib_globals_table,
+    },
+};
+
+const mp_obj_module_t mp_module_zlibd = {
+    .base = { &mp_type_module },
+    .name = MP_QSTR_zlibd,
+    .globals = (mp_obj_dict_t*)&mp_module_zlib_globals,
+};
+
+#endif //MICROPY_PY_ZLIBD

py/builtin.h

@@ -89,3 +89,4 @@ extern struct _dummy_t mp_sys_stderr_obj;
 
 // extmod modules
 extern const mp_obj_module_t mp_module_uctypes;
+extern const mp_obj_module_t mp_module_zlibd;

py/builtintables.c

@@ -196,6 +196,9 @@ STATIC const mp_map_elem_t mp_builtin_module_table[] = {
 #if MICROPY_PY_UCTYPES
     { MP_OBJ_NEW_QSTR(MP_QSTR_uctypes), (mp_obj_t)&mp_module_uctypes },
 #endif
+#if MICROPY_PY_ZLIBD
+    { MP_OBJ_NEW_QSTR(MP_QSTR_zlibd), (mp_obj_t)&mp_module_zlibd },
+#endif
 
     // extra builtin modules as defined by a port
     MICROPY_PORT_BUILTIN_MODULES

py/mpconfig.h

@@ -368,10 +368,15 @@ typedef double mp_float_t;
 
 
 // Extended modules
+
 #ifndef MICROPY_PY_UCTYPES
 #define MICROPY_PY_UCTYPES (0)
 #endif
 
+#ifndef MICROPY_PY_ZLIBD
+#define MICROPY_PY_ZLIBD (0)
+#endif
+
 /*****************************************************************************/
 /* Hooks for a port to add builtins                                          */
 

py/py.mk

@@ -104,7 +104,8 @@ PY_O_BASENAME = \
 	smallint.o \
 	pfenv.o \
 	pfenv_printf.o \
-	../extmod/moductypes.o
+	../extmod/moductypes.o \
+	../extmod/modzlibd.o \
 
 # prepend the build destination prefix to the py object files
 PY_O = $(addprefix $(PY_BUILD)/, $(PY_O_BASENAME))

py/qstrdefs.h

@@ -450,3 +450,8 @@ Q(getter)
 Q(setter)
 Q(deleter)
 #endif
+
+#if MICROPY_PY_ZLIBD
+Q(zlibd)
+Q(decompress)
+#endif

unix/mpconfigport.h

@@ -54,6 +54,7 @@
 #define MICROPY_PY_GC_COLLECT_RETVAL (1)
 
 #define MICROPY_PY_UCTYPES          (1)
+#define MICROPY_PY_ZLIBD            (1)
 
 // Define to MICROPY_ERROR_REPORTING_DETAILED to get function, etc.
 // names in exception messages (may require more RAM).