add circuitpython code

1 files changed, 100 insertions, 0 deletions

diff --git a/circuitpython/shared-module/zlib/__init__.c b/circuitpython/shared-module/zlib/__init__.c
new file mode 100644
index 0000000..a057e6e
--- /dev/null
+++ b/circuitpython/shared-module/zlib/__init__.c
@@ -0,0 +1,100 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Mark Komus
+ *
+ * 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 <stdint.h>
+#include <assert.h>
+#include <string.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+#include "py/stream.h"
+#include "py/mperrno.h"
+#include "py/builtin.h"
+#include "py/objtuple.h"
+#include "py/binary.h"
+#include "py/parsenum.h"
+
+#include "shared-bindings/zlib/__init__.h"
+
+#define UZLIB_CONF_PARANOID_CHECKS (1)
+#include "lib/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
+
+mp_obj_t common_hal_zlib_decompress(mp_obj_t data, bool is_zlib) {
+    mp_buffer_info_t bufinfo;
+    mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
+
+    TINF_DATA *decomp = m_new_obj(TINF_DATA);
+    memset(decomp, 0, sizeof(*decomp));
+    DEBUG_printf("sizeof(TINF_DATA)=" UINT_FMT "\n", sizeof(*decomp));
+    uzlib_uncompress_init(decomp, NULL, 0);
+    mp_uint_t dest_buf_size = (bufinfo.len + 15) & ~15;
+    byte *dest_buf = m_new(byte, dest_buf_size);
+
+    decomp->dest = dest_buf;
+    decomp->dest_limit = dest_buf + dest_buf_size;
+    DEBUG_printf("zlib: Initial out buffer: " UINT_FMT " bytes\n", decomp->destSize);
+    decomp->source = bufinfo.buf;
+    decomp->source_limit = (unsigned char *)bufinfo.buf + bufinfo.len;
+    int st;
+
+    if (is_zlib) {
+        st = uzlib_zlib_parse_header(decomp);
+        if (st < 0) {
+            goto error;
+        }
+    }
+
+    while (1) {
+        st = uzlib_uncompress_chksum(decomp);
+        if (st < 0) {
+            goto error;
+        }
+        if (st == TINF_DONE) {
+            break;
+        }
+        size_t offset = decomp->dest - dest_buf;
+        dest_buf = m_renew(byte, dest_buf, dest_buf_size, dest_buf_size + 256);
+        dest_buf_size += 256;
+        decomp->dest = dest_buf + offset;
+        decomp->dest_limit = dest_buf + offset + 256;
+    }
+
+    mp_uint_t final_sz = decomp->dest - dest_buf;
+    DEBUG_printf("zlib: Resizing from " UINT_FMT " to final size: " UINT_FMT " bytes\n", dest_buf_size, final_sz);
+    dest_buf = (byte *)m_renew(byte, dest_buf, dest_buf_size, final_sz);
+    mp_obj_t res = mp_obj_new_bytearray_by_ref(final_sz, dest_buf);
+    m_del_obj(TINF_DATA, decomp);
+    return res;
+
+error:
+    mp_raise_type_arg(&mp_type_ValueError, MP_OBJ_NEW_SMALL_INT(st));
+}