225 lines
7.6 KiB
C
225 lines
7.6 KiB
C
/*
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* This file is part of the Micro Python project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014 Paul Sokolovsky
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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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/nlr.h"
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#include "py/runtime.h"
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#include "py/binary.h"
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#include "modubinascii.h"
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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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mp_get_buffer_raise(args[0], &bufinfo, MP_BUFFER_READ);
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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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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "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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nlr_raise(mp_obj_new_exception_msg_varg(&mp_type_ValueError, "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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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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if (bufinfo.len % 4 != 0) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "incorrect padding"));
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}
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vstr_t vstr;
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byte *in = bufinfo.buf;
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if (bufinfo.len == 0) {
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vstr_init_len(&vstr, 0);
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}
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else {
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vstr_init_len(&vstr, ((bufinfo.len / 4) * 3) - ((in[bufinfo.len-1] == '=') ? ((in[bufinfo.len-2] == '=') ? 2 : 1 ) : 0));
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}
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byte *out = (byte*)vstr.buf;
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for (mp_uint_t i = bufinfo.len; i; i -= 4) {
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char hold[4];
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for (int j = 4; j--;) {
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if (in[j] >= 'A' && in[j] <= 'Z') {
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hold[j] = in[j] - 'A';
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} else if (in[j] >= 'a' && in[j] <= 'z') {
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hold[j] = in[j] - 'a' + 26;
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} else if (in[j] >= '0' && in[j] <= '9') {
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hold[j] = in[j] - '0' + 52;
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} else if (in[j] == '+') {
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hold[j] = 62;
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} else if (in[j] == '/') {
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hold[j] = 63;
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} else if (in[j] == '=') {
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if (j < 2 || i > 4) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "incorrect padding"));
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}
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hold[j] = 64;
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} else {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "invalid character"));
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}
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}
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in += 4;
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*out++ = (hold[0]) << 2 | (hold[1]) >> 4;
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if (hold[2] != 64) {
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*out++ = (hold[1] & 0x0F) << 4 | hold[2] >> 2;
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if (hold[3] != 64) {
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*out++ = (hold[2] & 0x03) << 6 | hold[3];
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}
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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_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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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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}
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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
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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_ubinascii) },
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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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};
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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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.name = MP_QSTR_ubinascii,
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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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