1 /* crypto/evp/bio_b64.c */
2 /* Copyright (C) 1995-1997 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
66 static int b64_write(BIO *h,char *buf,int num);
67 static int b64_read(BIO *h,char *buf,int size);
68 /*static int b64_puts(BIO *h,char *str); */
69 /*static int b64_gets(BIO *h,char *str,int size); */
70 static long b64_ctrl(BIO *h,int cmd,long arg1,char *arg2);
71 static int b64_new(BIO *h);
72 static int b64_free(BIO *data);
74 static int b64_write();
75 static int b64_read();
76 /*static int b64_puts(); */
77 /*static int b64_gets(); */
78 static long b64_ctrl();
80 static int b64_free();
83 #define B64_BLOCK_SIZE 1024
88 typedef struct b64_struct
90 /*BIO *bio; moved to the BIO structure */
93 int tmp_len; /* used to find the start when decoding */
94 int tmp_nl; /* If true, scan until '\n' */
96 int start; /* have we started decoding yet? */
97 int cont; /* <= 0 when finished */
98 EVP_ENCODE_CTX base64;
99 char buf[EVP_ENCODE_LENGTH(B64_BLOCK_SIZE)+10];
100 char tmp[B64_BLOCK_SIZE];
103 static BIO_METHOD methods_b64=
105 BIO_TYPE_BASE64,"base64 encoding",
108 NULL, /* b64_puts, */
109 NULL, /* b64_gets, */
115 BIO_METHOD *BIO_f_base64()
117 return(&methods_b64);
120 static int b64_new(bi)
125 ctx=(BIO_B64_CTX *)Malloc(sizeof(BIO_B64_CTX));
126 if (ctx == NULL) return(0);
142 static int b64_free(a)
145 if (a == NULL) return(0);
153 static int b64_read(b,out,outl)
158 int ret=0,i,ii,j,k,x,n,num;
162 if (out == NULL) return(0);
163 ctx=(BIO_B64_CTX *)b->ptr;
165 if ((ctx == NULL) || (b->next_bio == NULL)) return(0);
167 if (ctx->encode != B64_DECODE)
169 ctx->encode=B64_DECODE;
172 EVP_DecodeInit(&(ctx->base64));
175 /* First check if there are bytes decoded/encoded */
176 if (ctx->buf_len > 0)
178 i=ctx->buf_len-ctx->buf_off;
179 if (i > outl) i=outl;
180 memcpy(out,&(ctx->buf[ctx->buf_off]),i);
185 if (ctx->buf_len == ctx->buf_off)
192 /* At this point, we have room of outl bytes and an empty
193 * buffer, so we should read in some more. */
197 if (ctx->cont <= 0) break;
199 i=BIO_read(b->next_bio,&(ctx->tmp[ctx->tmp_len]),
200 B64_BLOCK_SIZE-ctx->tmp_len);
204 /* Should be continue next time we are called? */
205 if (!BIO_should_retry(b->next_bio))
211 /* We need to scan, a line at a time until we
212 * have a valid line if we are starting. */
215 q=p=(unsigned char *)ctx->tmp;
218 if (*(q++) != '\n') continue;
220 /* due to a previous very long line,
221 * we need to keep on scanning for a '\n'
222 * before we even start looking for
223 * base64 encoded stuff. */
231 k=EVP_DecodeUpdate(&(ctx->base64),
232 (unsigned char *)ctx->buf,
234 if ((k <= 0) && (num == 0) && (ctx->start))
235 EVP_DecodeInit(&ctx->base64);
238 if (p != (unsigned char *)
241 i-=(p- (unsigned char *)
243 for (x=0; x < i; x++)
245 EVP_DecodeInit(&ctx->base64);
253 /* we fell off the end without starting */
256 /* Is this is one long chunk?, if so, keep on
257 * reading until a new line. */
258 if (p == (unsigned char *)&(ctx->tmp[0]))
263 else if (p != q) /* finished on a '\n' */
266 for (ii=0; ii<n; ii++)
270 /* else finished on a '\n' */
276 i=EVP_DecodeUpdate(&(ctx->base64),
277 (unsigned char *)ctx->buf,&ctx->buf_len,
278 (unsigned char *)ctx->tmp,i);
287 if (ctx->buf_len <= outl)
292 memcpy(out,ctx->buf,i);
295 if (ctx->buf_off == ctx->buf_len)
303 BIO_clear_retry_flags(b);
304 BIO_copy_next_retry(b);
305 return((ret == 0)?ctx->cont:ret);
308 static int b64_write(b,in,inl)
316 ctx=(BIO_B64_CTX *)b->ptr;
317 BIO_clear_retry_flags(b);
319 if (ctx->encode != B64_ENCODE)
321 ctx->encode=B64_ENCODE;
324 EVP_EncodeInit(&(ctx->base64));
327 n=ctx->buf_len-ctx->buf_off;
330 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
333 BIO_copy_next_retry(b);
339 /* at this point all pending data has been written */
341 if ((in == NULL) || (inl <= 0)) return(0);
346 n=(inl > B64_BLOCK_SIZE)?B64_BLOCK_SIZE:inl;
347 EVP_EncodeUpdate(&(ctx->base64),
348 (unsigned char *)ctx->buf,&ctx->buf_len,
349 (unsigned char *)in,n);
357 i=BIO_write(b->next_bio,&(ctx->buf[ctx->buf_off]),n);
360 BIO_copy_next_retry(b);
361 return((ret == 0)?i:ret);
372 static long b64_ctrl(b,cmd,num,ptr)
382 ctx=(BIO_B64_CTX *)b->ptr;
389 ctx->encode=B64_NONE;
390 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
392 case BIO_CTRL_EOF: /* More to read */
396 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
398 case BIO_CTRL_WPENDING: /* More to write in buffer */
399 ret=ctx->buf_len-ctx->buf_off;
400 if ((ret == 0) && (ctx->base64.num != 0))
403 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
405 case BIO_CTRL_PENDING: /* More to read in buffer */
406 ret=ctx->buf_len-ctx->buf_off;
408 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
411 /* do a final write */
413 while (ctx->buf_len != ctx->buf_off)
415 i=b64_write(b,NULL,0);
422 if (ctx->base64.num != 0)
425 EVP_EncodeFinal(&(ctx->base64),
426 (unsigned char *)ctx->buf,
428 /* push out the bytes */
431 /* Finally flush the underlying BIO */
432 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
435 case BIO_C_DO_STATE_MACHINE:
436 BIO_clear_retry_flags(b);
437 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
438 BIO_copy_next_retry(b);
447 ret=BIO_ctrl(b->next_bio,cmd,num,ptr);