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2.8 kB · 98 lines
C
at develop
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899/*cencoder.c - c source to a base64 encoding 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/cencode.h>
const int CHARS_PER_LINE = 72;
void base64_init_encodestate(base64_encodestate* state_in) { state_in->step = step_A; state_in->result = 0; state_in->stepcount = 0;}
char base64_encode_value(char value_in) { static const char* encoding = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; if (value_in > 63) return '='; return encoding[(int)value_in];}
int base64_encode_block(const char* plaintext_in, int length_in, char* code_out, base64_encodestate* state_in) { const char* plainchar = plaintext_in; const char* const plaintextend = plaintext_in + length_in; char* codechar = code_out; char result; char fragment;
result = state_in->result;
switch (state_in->step) { while (1) { case step_A: if (plainchar == plaintextend) { state_in->result = result; state_in->step = step_A; return codechar - code_out; } fragment = *plainchar++; result = (fragment & 0x0fc) >> 2; *codechar++ = base64_encode_value(result); result = (fragment & 0x003) << 4; case step_B: if (plainchar == plaintextend) { state_in->result = result; state_in->step = step_B; return codechar - code_out; } fragment = *plainchar++; result |= (fragment & 0x0f0) >> 4; *codechar++ = base64_encode_value(result); result = (fragment & 0x00f) << 2; case step_C: if (plainchar == plaintextend) { state_in->result = result; state_in->step = step_C; return codechar - code_out; } fragment = *plainchar++; result |= (fragment & 0x0c0) >> 6; *codechar++ = base64_encode_value(result); result = (fragment & 0x03f) >> 0; *codechar++ = base64_encode_value(result);
++(state_in->stepcount); if (state_in->stepcount == CHARS_PER_LINE / 4) { *codechar++ = '\n'; state_in->stepcount = 0; } } } /* control should not reach here */ return codechar - code_out;}
int base64_encode_blockend(char* code_out, base64_encodestate* state_in) { char* codechar = code_out;
switch (state_in->step) { case step_B: *codechar++ = base64_encode_value(state_in->result); *codechar++ = '='; *codechar++ = '='; break; case step_C: *codechar++ = base64_encode_value(state_in->result); *codechar++ = '='; break; case step_A: break; } *codechar++ = '\n';
return codechar - code_out;}