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3.0 kB · 83 lines
C
at develop
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384/*cdecoder.c - c source to a base64 decoding algorithm implementation
This is part of the libb64 project, and has been placed in the public domain.For details, see http://sourceforge.net/projects/libb64*/
#include <minizinc/_thirdparty/b64/cdecode.h>
int base64_decode_value(char value_in) { static const char decoding[] = {62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -2, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51}; static const char decoding_size = sizeof(decoding); value_in -= 43; if (value_in < 0 || value_in >= decoding_size) return -1; return decoding[(int)value_in];}
void base64_init_decodestate(base64_decodestate* state_in) { state_in->step = step_a; state_in->plainchar = 0;}
int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in) { const char* codechar = code_in; char* plainchar = plaintext_out; char fragment;
*plainchar = state_in->plainchar;
switch (state_in->step) { while (1) { case step_a: do { if (codechar == code_in + length_in) { state_in->step = step_a; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar = (fragment & 0x03f) << 2; case step_b: do { if (codechar == code_in + length_in) { state_in->step = step_b; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar++ |= (fragment & 0x030) >> 4; *plainchar = (fragment & 0x00f) << 4; case step_c: do { if (codechar == code_in + length_in) { state_in->step = step_c; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar++ |= (fragment & 0x03c) >> 2; *plainchar = (fragment & 0x003) << 6; case step_d: do { if (codechar == code_in + length_in) { state_in->step = step_d; state_in->plainchar = *plainchar; return plainchar - plaintext_out; } fragment = (char)base64_decode_value(*codechar++); } while (fragment < 0); *plainchar++ |= (fragment & 0x03f); } } /* control should not reach here */ return plainchar - plaintext_out;}