(Oh, adding base64 stuff)

base64/base64.c

@@ -0,0 +1,40 @@
+#include	<string.h>
+#include	"cencode.h"
+#include	"cdecode.h"
+
+/**
+ * \brief  base64-encode an input buffer
+ * \param  in 		Sequence of bytes to be encoded
+ * \param  in_len 	Length of the input sequence
+ * \param  out 	Pointer to the buffer that will contain the output (its length must be at least 2*in_len + 1)
+ */
+
+void
+base64_encode ( const char *in, size_t in_len, char **out )
+{
+	char pad[100] = { 0 };
+	base64_encodestate e_state;
+
+	base64_init_encodestate ( &e_state );
+	base64_encode_block ( in, in_len, *out, &e_state );
+	base64_encode_blockend ( pad, &e_state );
+	
+	pad[ strlen(pad) - 1 ] = 0;
+	strcat ( *out, pad );
+}		/* -----  end of function base64_encode  ----- */
+
+/**
+ * \brief  base64-decode a base64 string
+ * \param  in 		base64 string to be decoded
+ * \param  out 	Pointer to the buffer that will contain the output (its length should be at least the same like the length of in)
+ */
+
+void
+base64_decode ( const char *in, char **out )
+{
+	base64_decodestate d_state;
+
+	base64_init_decodestate ( &d_state );
+	base64_decode_block ( in, strlen ( in ), *out, &d_state );
+}		/* -----  end of function base64_decode  ----- */
+

base64/cdecode.c

@@ -0,0 +1,88 @@
+/*
+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 "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;
+}
+

base64/cdecode.h

@@ -0,0 +1,28 @@
+/*
+cdecode.h - c header for a base64 decoding algorithm
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#ifndef BASE64_CDECODE_H
+#define BASE64_CDECODE_H
+
+typedef enum
+{
+	step_a, step_b, step_c, step_d
+} base64_decodestep;
+
+typedef struct
+{
+	base64_decodestep step;
+	char plainchar;
+} base64_decodestate;
+
+void base64_init_decodestate(base64_decodestate* state_in);
+
+int base64_decode_value(char value_in);
+
+int base64_decode_block(const char* code_in, const int length_in, char* plaintext_out, base64_decodestate* state_in);
+
+#endif /* BASE64_CDECODE_H */

base64/cencode.c

@@ -0,0 +1,109 @@
+/*
+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 "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;
+}
+

base64/cencode.h

@@ -0,0 +1,31 @@
+/*
+cencode.h - c header for a base64 encoding algorithm
+
+This is part of the libb64 project, and has been placed in the public domain.
+For details, see http://sourceforge.net/projects/libb64
+*/
+
+#ifndef BASE64_CENCODE_H
+#define BASE64_CENCODE_H
+
+typedef enum
+{
+	step_A, step_B, step_C
+} base64_encodestep;
+
+typedef struct
+{
+	base64_encodestep step;
+	char result;
+	int stepcount;
+} base64_encodestate;
+
+void base64_init_encodestate(base64_encodestate* state_in);
+
+char base64_encode_value(char value_in);
+
+int base64_encode_block(const char* plaintext_in, int length_in, char* code_out, base64_encodestate* state_in);
+
+int base64_encode_blockend(char* code_out, base64_encodestate* state_in);
+
+#endif /* BASE64_CENCODE_H */