|
1 | | -#define_XOPEN_SOURCE// IOV_MAX |
| 1 | +// Test for MinGW. |
| 2 | +#if defined(__MINGW32__) || defined(__MINGW64__) |
| 3 | +# defineMINGW |
| 4 | +#endif |
| 5 | + |
| 6 | +// Decide if the writev(2) system call needs to be emulated as a series of |
| 7 | +// write(2) calls. At least MinGW does not support writev(2). |
| 8 | +#ifdefMINGW |
| 9 | +# defineEMULATE_WRITEV |
| 10 | +#endif |
| 11 | + |
| 12 | +// Include the necessary system header when using the system's writev(2). |
| 13 | +#ifndefEMULATE_WRITEV |
| 14 | +# define_XOPEN_SOURCE// Unlock IOV_MAX |
| 15 | +# include<sys/uio.h> |
| 16 | +#endif |
2 | 17 |
|
3 | 18 | #include<stdbool.h> |
4 | 19 | #include<stdlib.h> |
|
8 | 23 | #include<getopt.h> |
9 | 24 | #include<errno.h> |
10 | 25 | #include<limits.h> |
11 | | -#include<sys/uio.h> |
| 26 | + |
12 | 27 | #include"../include/libbase64.h" |
13 | 28 |
|
14 | 29 | // Size of the buffer for the "raw" (not base64-encoded) data in bytes. |
@@ -50,6 +65,59 @@ struct buffer{ |
50 | 65 | char*enc; |
51 | 66 | }; |
52 | 67 |
|
| 68 | +// Optionally emulate writev(2) as a series of write calls. |
| 69 | +#ifdefEMULATE_WRITEV |
| 70 | + |
| 71 | +// Quick and dirty definition of IOV_MAX as it is probably not defined. |
| 72 | +#ifndefIOV_MAX |
| 73 | +# defineIOV_MAX 1024 |
| 74 | +#endif |
| 75 | + |
| 76 | +// Quick and dirty definition of this system struct, for local use only. |
| 77 | +structiovec{ |
| 78 | + |
| 79 | +// Opaque data pointer. |
| 80 | +void*iov_base; |
| 81 | + |
| 82 | +// Length of the data in bytes. |
| 83 | +size_tiov_len; |
| 84 | +}; |
| 85 | + |
| 86 | +staticssize_t |
| 87 | +writev (constintfd, conststructiovec*iov, intiovcnt) |
| 88 | +{ |
| 89 | +ssize_tr, nwrite=0; |
| 90 | + |
| 91 | +// Reset the error marker. |
| 92 | +errno=0; |
| 93 | + |
| 94 | +while (iovcnt-->0){ |
| 95 | + |
| 96 | +// Write the vector; propagate errors back to the caller. Note |
| 97 | +// that this loses information about how much vectors have been |
| 98 | +// successfully written, but that also seems to be the case |
| 99 | +// with the real function. The API is somewhat flawed. |
| 100 | +if ((r=write(fd, iov->iov_base, iov->iov_len)) <0){ |
| 101 | +returnr; |
| 102 | + } |
| 103 | + |
| 104 | +// Update the total write count. |
| 105 | +nwrite+=r; |
| 106 | + |
| 107 | +// Return early after a partial write; the caller should retry. |
| 108 | +if ((size_t) r!=iov->iov_len){ |
| 109 | +break; |
| 110 | + } |
| 111 | + |
| 112 | +// Move to the next vector. |
| 113 | +iov++; |
| 114 | + } |
| 115 | + |
| 116 | +returnnwrite; |
| 117 | +} |
| 118 | + |
| 119 | +#endif// EMULATE_WRITEV |
| 120 | + |
53 | 121 | staticbool |
54 | 122 | buffer_alloc (conststructconfig*config, structbuffer*buf) |
55 | 123 | { |
@@ -272,29 +340,75 @@ encode (const struct config *config, struct buffer *buf) |
272 | 340 | return true; |
273 | 341 | } |
274 | 342 |
|
275 | | -staticint |
| 343 | +staticinlinesize_t |
| 344 | +find_newline (constchar*p, constsize_tavail) |
| 345 | +{ |
| 346 | +// This is very naive and can probably be improved by vectorization. |
| 347 | +for (size_tlen=0; len<avail; len++){ |
| 348 | +if (p[len] =='\n'){ |
| 349 | +returnlen; |
| 350 | + } |
| 351 | + } |
| 352 | + |
| 353 | +returnavail; |
| 354 | +} |
| 355 | + |
| 356 | +staticbool |
276 | 357 | decode (conststructconfig*config, structbuffer*buf) |
277 | 358 | { |
278 | | -size_tnread, nout; |
| 359 | +size_tavail; |
279 | 360 | structbase64_statestate; |
280 | 361 |
|
281 | 362 | // Initialize the decoder's state structure. |
282 | 363 | base64_stream_decode_init(&state, 0); |
283 | 364 |
|
284 | 365 | // Read encoded data into the buffer. Use the smallest buffer size to |
285 | 366 | // be on the safe side: the decoded output will fit the raw buffer. |
286 | | -while ((nread=fread(buf->enc, 1, BUFFER_RAW_SIZE, config->fp)) >0){ |
| 367 | +while ((avail=fread(buf->enc, 1, BUFFER_RAW_SIZE, config->fp)) >0){ |
| 368 | +char*start=buf->enc; |
| 369 | +char*outbuf=buf->raw; |
| 370 | +size_tototal=0; |
| 371 | + |
| 372 | +// By popular demand, this utility tries to be bug-compatible |
| 373 | +// with GNU `base64'. That includes silently ignoring newlines |
| 374 | +// in the input. Tokenize the input on newline characters. |
| 375 | +while (avail>0){ |
| 376 | + |
| 377 | +// Find the offset of the next newline character, which |
| 378 | +// is also the length of the next chunk. |
| 379 | +size_toutlen, len=find_newline(start, avail); |
| 380 | + |
| 381 | +// Ignore empty chunks. |
| 382 | +if (len==0){ |
| 383 | +start++; |
| 384 | +avail--; |
| 385 | +continue; |
| 386 | + } |
287 | 387 |
|
288 | | -// Decode the input into the raw buffer. |
289 | | -if (base64_stream_decode(&state, buf->enc, nread, |
290 | | -buf->raw, &nout) ==0){ |
291 | | -fprintf(stderr, "%s: %s: decoding error\n", |
292 | | -config->name, config->file); |
293 | | -return false; |
| 388 | +// Decode the chunk into the raw buffer. |
| 389 | +if (base64_stream_decode(&state, start, len, |
| 390 | +outbuf, &outlen) ==0){ |
| 391 | +fprintf(stderr, "%s: %s: decoding error\n", |
| 392 | +config->name, config->file); |
| 393 | +return false; |
| 394 | + } |
| 395 | + |
| 396 | +// Update the output buffer pointer and total size. |
| 397 | +outbuf+=outlen; |
| 398 | +ototal+=outlen; |
| 399 | + |
| 400 | +// Bail out if the whole string has been consumed. |
| 401 | +if (len==avail){ |
| 402 | +break; |
| 403 | + } |
| 404 | + |
| 405 | +// Move the start pointer past the newline. |
| 406 | +start+=len+1; |
| 407 | +avail-=len+1; |
294 | 408 | } |
295 | 409 |
|
296 | 410 | // Append the raw data to the output stream. |
297 | | -if (write_stdout(config, buf->raw, nout) == false){ |
| 411 | +if (write_stdout(config, buf->raw, ototal) == false){ |
298 | 412 | return false; |
299 | 413 | } |
300 | 414 | } |
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