243 lines
7.5 KiB
C
243 lines
7.5 KiB
C
// Copyright (c) 2014 Paul Sokolovsky
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// SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
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//
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// SPDX-License-Identifier: MIT
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#include <stdio.h>
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#include <assert.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "py/binary.h"
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#include "extmod/modubinascii.h"
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static void check_not_unicode(const mp_obj_t arg) {
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#if MICROPY_CPYTHON_COMPAT
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if (MP_OBJ_IS_STR(arg)) {
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mp_raise_TypeError(translate("a bytes-like object is required"));
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}
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#endif
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}
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mp_obj_t mod_binascii_hexlify(size_t n_args, const mp_obj_t *args) {
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// Second argument is for an extension to allow a separator to be used
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// between values.
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const char *sep = NULL;
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mp_buffer_info_t bufinfo;
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check_not_unicode(args[0]);
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mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
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// Code below assumes non-zero buffer length when computing size with
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// separator, so handle the zero-length case here.
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if (bufinfo.len == 0) {
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return mp_const_empty_bytes;
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}
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vstr_t vstr;
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size_t out_len = bufinfo.len * 2;
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if (n_args > 1) {
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// 1-char separator between hex numbers
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out_len += bufinfo.len - 1;
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sep = mp_obj_str_get_str(args[1]);
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}
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vstr_init_len(&vstr, out_len);
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byte *in = bufinfo.buf, *out = (byte *)vstr.buf;
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for (mp_uint_t i = bufinfo.len; i--;) {
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byte d = (*in >> 4);
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if (d > 9) {
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d += 'a' - '9' - 1;
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}
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*out++ = d + '0';
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d = (*in++ & 0xf);
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if (d > 9) {
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d += 'a' - '9' - 1;
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}
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*out++ = d + '0';
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if (sep != NULL && i != 0) {
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*out++ = *sep;
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}
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_binascii_hexlify_obj, 1, 2, mod_binascii_hexlify);
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mp_obj_t mod_binascii_unhexlify(mp_obj_t data) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
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if ((bufinfo.len & 1) != 0) {
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mp_raise_ValueError(translate("odd-length string"));
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}
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vstr_t vstr;
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vstr_init_len(&vstr, bufinfo.len / 2);
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byte *in = bufinfo.buf, *out = (byte *)vstr.buf;
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byte hex_byte = 0;
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for (mp_uint_t i = bufinfo.len; i--;) {
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byte hex_ch = *in++;
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if (unichar_isxdigit(hex_ch)) {
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hex_byte += unichar_xdigit_value(hex_ch);
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} else {
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mp_raise_ValueError(translate("non-hex digit found"));
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}
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if (i & 1) {
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hex_byte <<= 4;
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} else {
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*out++ = hex_byte;
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hex_byte = 0;
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}
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_unhexlify_obj, mod_binascii_unhexlify);
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// If ch is a character in the base64 alphabet, and is not a pad character, then
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// the corresponding integer between 0 and 63, inclusively, is returned.
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// Otherwise, -1 is returned.
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static int mod_binascii_sextet(byte ch) {
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if (ch >= 'A' && ch <= 'Z') {
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return ch - 'A';
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} else if (ch >= 'a' && ch <= 'z') {
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return ch - 'a' + 26;
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} else if (ch >= '0' && ch <= '9') {
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return ch - '0' + 52;
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} else if (ch == '+') {
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return 62;
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} else if (ch == '/') {
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return 63;
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} else {
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return -1;
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}
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}
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mp_obj_t mod_binascii_a2b_base64(mp_obj_t data) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
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byte *in = bufinfo.buf;
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vstr_t vstr;
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vstr_init(&vstr, (bufinfo.len / 4) * 3 + 1); // Potentially over-allocate
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byte *out = (byte *)vstr.buf;
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uint shift = 0;
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int nbits = 0; // Number of meaningful bits in shift
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bool hadpad = false; // Had a pad character since last valid character
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for (size_t i = 0; i < bufinfo.len; i++) {
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if (in[i] == '=') {
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if ((nbits == 2) || ((nbits == 4) && hadpad)) {
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nbits = 0;
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break;
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}
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hadpad = true;
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}
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int sextet = mod_binascii_sextet(in[i]);
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if (sextet == -1) {
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continue;
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}
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hadpad = false;
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shift = (shift << 6) | sextet;
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nbits += 6;
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if (nbits >= 8) {
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nbits -= 8;
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out[vstr.len++] = (shift >> nbits) & 0xFF;
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}
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}
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if (nbits) {
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mp_raise_ValueError(translate("incorrect padding"));
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}
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_a2b_base64_obj, mod_binascii_a2b_base64);
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mp_obj_t mod_binascii_b2a_base64(mp_obj_t data) {
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check_not_unicode(data);
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(data, &bufinfo, MP_BUFFER_READ);
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vstr_t vstr;
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vstr_init_len(&vstr, ((bufinfo.len != 0) ? (((bufinfo.len - 1) / 3) + 1) * 4 : 0) + 1);
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// First pass, we convert input buffer to numeric base 64 values
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byte *in = bufinfo.buf, *out = (byte *)vstr.buf;
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mp_uint_t i;
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for (i = bufinfo.len; i >= 3; i -= 3) {
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*out++ = (in[0] & 0xFC) >> 2;
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*out++ = (in[0] & 0x03) << 4 | (in[1] & 0xF0) >> 4;
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*out++ = (in[1] & 0x0F) << 2 | (in[2] & 0xC0) >> 6;
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*out++ = in[2] & 0x3F;
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in += 3;
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}
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if (i != 0) {
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*out++ = (in[0] & 0xFC) >> 2;
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if (i == 2) {
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*out++ = (in[0] & 0x03) << 4 | (in[1] & 0xF0) >> 4;
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*out++ = (in[1] & 0x0F) << 2;
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} else {
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*out++ = (in[0] & 0x03) << 4;
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*out++ = 64;
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}
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*out = 64;
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}
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// Second pass, we convert number base 64 values to actual base64 ascii encoding
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out = (byte *)vstr.buf;
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for (mp_uint_t j = vstr.len - 1; j--;) {
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if (*out < 26) {
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*out += 'A';
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} else if (*out < 52) {
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*out += 'a' - 26;
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} else if (*out < 62) {
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*out += '0' - 52;
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} else if (*out == 62) {
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*out = '+';
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} else if (*out == 63) {
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*out = '/';
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} else {
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*out = '=';
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}
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out++;
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}
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*out = '\n';
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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MP_DEFINE_CONST_FUN_OBJ_1(mod_binascii_b2a_base64_obj, mod_binascii_b2a_base64);
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#if MICROPY_PY_UBINASCII_CRC32
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#include "../../lib/uzlib/src/tinf.h"
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mp_obj_t mod_binascii_crc32(size_t n_args, const mp_obj_t *args) {
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mp_buffer_info_t bufinfo;
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check_not_unicode(args[0]);
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mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
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uint32_t crc = (n_args > 1) ? mp_obj_get_int_truncated(args[1]) : 0;
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crc = uzlib_crc32(bufinfo.buf, bufinfo.len, crc ^ 0xffffffff);
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return mp_obj_new_int_from_uint(crc ^ 0xffffffff);
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mod_binascii_crc32_obj, 1, 2, mod_binascii_crc32);
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#endif
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#if MICROPY_PY_UBINASCII
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STATIC const mp_rom_map_elem_t mp_module_binascii_globals_table[] = {
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{ MP_ROM_QSTR(MP_QSTR___name__), MP_ROM_QSTR(MP_QSTR_binascii) },
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{ MP_ROM_QSTR(MP_QSTR_hexlify), MP_ROM_PTR(&mod_binascii_hexlify_obj) },
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{ MP_ROM_QSTR(MP_QSTR_unhexlify), MP_ROM_PTR(&mod_binascii_unhexlify_obj) },
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{ MP_ROM_QSTR(MP_QSTR_a2b_base64), MP_ROM_PTR(&mod_binascii_a2b_base64_obj) },
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{ MP_ROM_QSTR(MP_QSTR_b2a_base64), MP_ROM_PTR(&mod_binascii_b2a_base64_obj) },
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#if MICROPY_PY_UBINASCII_CRC32
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{ MP_ROM_QSTR(MP_QSTR_crc32), MP_ROM_PTR(&mod_binascii_crc32_obj) },
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#endif
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};
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STATIC MP_DEFINE_CONST_DICT(mp_module_binascii_globals, mp_module_binascii_globals_table);
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const mp_obj_module_t mp_module_ubinascii = {
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.base = { &mp_type_module },
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.globals = (mp_obj_dict_t *)&mp_module_binascii_globals,
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};
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#endif // MICROPY_PY_UBINASCII
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