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-rw-r--r--extmod/modbinascii.c208
1 files changed, 208 insertions, 0 deletions
diff --git a/extmod/modbinascii.c b/extmod/modbinascii.c
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+++ b/extmod/modbinascii.c
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+/*
+ * This file is part of the MicroPython 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 <assert.h>
+#include <string.h>
+
+#include "py/runtime.h"
+#include "py/binary.h"
+#include "py/objstr.h"
+
+#if MICROPY_PY_BINASCII
+
+#if MICROPY_PY_BUILTINS_BYTES_HEX
+STATIC mp_obj_t bytes_hex_as_bytes(size_t n_args, const mp_obj_t *args) {
+ return mp_obj_bytes_hex(n_args, args, &mp_type_bytes);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(bytes_hex_as_bytes_obj, 1, 2, bytes_hex_as_bytes);
+
+STATIC mp_obj_t bytes_fromhex_bytes(mp_obj_t data) {
+ return mp_obj_bytes_fromhex(MP_OBJ_FROM_PTR(&mp_type_bytes), data);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(bytes_fromhex_obj, bytes_fromhex_bytes);
+#endif
+
+// If ch is a character in the base64 alphabet, and is not a pad character, then
+// the corresponding integer between 0 and 63, inclusively, is returned.
+// Otherwise, -1 is returned.
+static int mod_binascii_sextet(byte ch) {
+ if (ch >= 'A' && ch <= 'Z') {
+ return ch - 'A';
+ } else if (ch >= 'a' && ch <= 'z') {
+ return ch - 'a' + 26;
+ } else if (ch >= '0' && ch <= '9') {
+ return ch - '0' + 52;
+ } else if (ch == '+') {
+ return 62;
+ } else if (ch == '/') {
+ return 63;
+ } else {
+ return -1;
+ }
+}
+
+STATIC mp_obj_t mod_binascii_a2b_base64(mp_obj_t data) {
+ mp_buffer_info_t bufinfo;
+ mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
+ byte *in = bufinfo.buf;
+
+ vstr_t vstr;
+ vstr_init(&vstr, (bufinfo.len / 4) * 3 + 1); // Potentially over-allocate
+ byte *out = (byte *)vstr.buf;
+
+ uint shift = 0;
+ int nbits = 0; // Number of meaningful bits in shift
+ bool hadpad = false; // Had a pad character since last valid character
+ for (size_t i = 0; i < bufinfo.len; i++) {
+ if (in[i] == '=') {
+ if ((nbits == 2) || ((nbits == 4) && hadpad)) {
+ nbits = 0;
+ break;
+ }
+ hadpad = true;
+ }
+
+ int sextet = mod_binascii_sextet(in[i]);
+ if (sextet == -1) {
+ continue;
+ }
+ hadpad = false;
+ shift = (shift << 6) | sextet;
+ nbits += 6;
+
+ if (nbits >= 8) {
+ nbits -= 8;
+ out[vstr.len++] = (shift >> nbits) & 0xFF;
+ }
+ }
+
+ if (nbits) {
+ mp_raise_ValueError(MP_ERROR_TEXT("incorrect padding"));
+ }
+
+ return mp_obj_new_bytes_from_vstr(&vstr);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_a2b_base64_obj, mod_binascii_a2b_base64);
+
+STATIC mp_obj_t mod_binascii_b2a_base64(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+ enum { ARG_newline };
+ static const mp_arg_t allowed_args[] = {
+ { MP_QSTR_newline, MP_ARG_BOOL, {.u_bool = true} },
+ };
+
+ mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
+ mp_arg_parse_all(n_args - 1, pos_args + 1, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
+ uint8_t newline = args[ARG_newline].u_bool;
+ mp_buffer_info_t bufinfo;
+ mp_get_buffer_raise(pos_args[0], &bufinfo, MP_BUFFER_READ);
+
+ vstr_t vstr;
+ vstr_init_len(&vstr, ((bufinfo.len != 0) ? (((bufinfo.len - 1) / 3) + 1) * 4 : 0) + newline);
+
+ // First pass, we convert input buffer to numeric base 64 values
+ byte *in = bufinfo.buf, *out = (byte *)vstr.buf;
+ mp_uint_t i;
+ for (i = bufinfo.len; i >= 3; i -= 3) {
+ *out++ = (in[0] & 0xFC) >> 2;
+ *out++ = (in[0] & 0x03) << 4 | (in[1] & 0xF0) >> 4;
+ *out++ = (in[1] & 0x0F) << 2 | (in[2] & 0xC0) >> 6;
+ *out++ = in[2] & 0x3F;
+ in += 3;
+ }
+ if (i != 0) {
+ *out++ = (in[0] & 0xFC) >> 2;
+ if (i == 2) {
+ *out++ = (in[0] & 0x03) << 4 | (in[1] & 0xF0) >> 4;
+ *out++ = (in[1] & 0x0F) << 2;
+ } else {
+ *out++ = (in[0] & 0x03) << 4;
+ *out++ = 64;
+ }
+ *out = 64;
+ }
+
+ // Second pass, we convert number base 64 values to actual base64 ascii encoding
+ out = (byte *)vstr.buf;
+ for (mp_uint_t j = vstr.len - newline; j--;) {
+ if (*out < 26) {
+ *out += 'A';
+ } else if (*out < 52) {
+ *out += 'a' - 26;
+ } else if (*out < 62) {
+ *out += '0' - 52;
+ } else if (*out == 62) {
+ *out = '+';
+ } else if (*out == 63) {
+ *out = '/';
+ } else {
+ *out = '=';
+ }
+ out++;
+ }
+ if (newline) {
+ *out = '\n';
+ }
+ return mp_obj_new_bytes_from_vstr(&vstr);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_KW(mod_binascii_b2a_base64_obj, 1, mod_binascii_b2a_base64);
+
+#if MICROPY_PY_BINASCII_CRC32
+#include "lib/uzlib/tinf.h"
+
+STATIC mp_obj_t mod_binascii_crc32(size_t n_args, const mp_obj_t *args) {
+ mp_buffer_info_t bufinfo;
+ mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
+ uint32_t crc = (n_args > 1) ? mp_obj_get_int_truncated(args[1]) : 0;
+ crc = uzlib_crc32(bufinfo.buf, bufinfo.len, crc ^ 0xffffffff);
+ return mp_obj_new_int_from_uint(crc ^ 0xffffffff);
+}
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_binascii_crc32_obj, 1, 2, mod_binascii_crc32);
+#endif
+
+STATIC const mp_rom_map_elem_t mp_module_binascii_globals_table[] = {
+ { MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_binascii) },
+ #if MICROPY_PY_BUILTINS_BYTES_HEX
+ { MP_ROM_QSTR(MP_QSTR_hexlify), MP_ROM_PTR(&bytes_hex_as_bytes_obj) },
+ { MP_ROM_QSTR(MP_QSTR_unhexlify), MP_ROM_PTR(&bytes_fromhex_obj) },
+ #endif
+ { MP_ROM_QSTR(MP_QSTR_a2b_base64), MP_ROM_PTR(&mod_binascii_a2b_base64_obj) },
+ { MP_ROM_QSTR(MP_QSTR_b2a_base64), MP_ROM_PTR(&mod_binascii_b2a_base64_obj) },
+ #if MICROPY_PY_BINASCII_CRC32
+ { MP_ROM_QSTR(MP_QSTR_crc32), MP_ROM_PTR(&mod_binascii_crc32_obj) },
+ #endif
+};
+
+STATIC MP_DEFINE_CONST_DICT(mp_module_binascii_globals, mp_module_binascii_globals_table);
+
+const mp_obj_module_t mp_module_binascii = {
+ .base = { &mp_type_module },
+ .globals = (mp_obj_dict_t *)&mp_module_binascii_globals,
+};
+
+MP_REGISTER_MODULE(MP_QSTR_binascii, mp_module_binascii);
+
+#endif // MICROPY_PY_BINASCII
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