2 Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 * @brief Utility methods.
25 #include "exceptions.h"
27 #include "argb_frame.h"
28 #include "certificates.h"
29 #include "gamma_lut.h"
30 #include "xyz_frame.h"
31 #include "compose.hpp"
33 #include "KM_fileio.h"
35 #include <xmlsec/xmldsig.h>
36 #include <xmlsec/dl.h>
37 #include <xmlsec/app.h>
38 #include <xmlsec/crypto.h>
39 #include <libxml++/nodes/element.h>
40 #include <libxml++/document.h>
41 #include <openssl/sha.h>
42 #include <boost/filesystem.hpp>
51 using std::stringstream;
58 using boost::shared_ptr;
59 using boost::optional;
60 using boost::function;
71 Kumu::GenRandomValue (id);
72 id.EncodeHex (buffer, 64);
73 return string (buffer);
77 /** Create a digest for a file.
78 * @param filename File name.
79 * @param progress Optional progress reporting function. The function will be called
80 * with a progress value between 0 and 1.
84 dcp::make_digest (boost::filesystem::path filename, function<void (float)> progress)
86 Kumu::FileReader reader;
87 Kumu::Result_t r = reader.OpenRead (filename.string().c_str ());
88 if (ASDCP_FAILURE (r)) {
89 boost::throw_exception (FileError ("could not open file to compute digest", filename, r));
95 int const buffer_size = 65536;
96 Kumu::ByteString read_buffer (buffer_size);
98 Kumu::fsize_t done = 0;
99 Kumu::fsize_t const size = reader.Size ();
102 Kumu::Result_t r = reader.Read (read_buffer.Data(), read_buffer.Capacity(), &read);
104 if (r == Kumu::RESULT_ENDOFFILE) {
106 } else if (ASDCP_FAILURE (r)) {
107 boost::throw_exception (FileError ("could not read file to compute digest", filename, r));
110 SHA1_Update (&sha, read_buffer.Data(), read);
113 progress (float (done) / size);
118 byte_t byte_buffer[SHA_DIGEST_LENGTH];
119 SHA1_Final (byte_buffer, &sha);
122 return Kumu::base64encode (byte_buffer, SHA_DIGEST_LENGTH, digest, 64);
125 /** Convert a content kind to a string which can be used in a
126 * <ContentKind> node.
127 * @param kind ContentKind.
131 dcp::content_kind_to_string (ContentKind kind)
143 return "transitional";
150 case PUBLIC_SERVICE_ANNOUNCEMENT:
153 return "advertisement";
159 /** Convert a string from a <ContentKind> node to a libdcp ContentKind.
160 * Reasonably tolerant about varying case.
161 * @param kind Content kind string.
162 * @return libdcp ContentKind.
165 dcp::content_kind_from_string (string kind)
167 transform (kind.begin(), kind.end(), kind.begin(), ::tolower);
169 if (kind == "feature") {
171 } else if (kind == "short") {
173 } else if (kind == "trailer") {
175 } else if (kind == "test") {
177 } else if (kind == "transitional") {
179 } else if (kind == "rating") {
181 } else if (kind == "teaser") {
183 } else if (kind == "policy") {
185 } else if (kind == "psa") {
186 return PUBLIC_SERVICE_ANNOUNCEMENT;
187 } else if (kind == "advertisement") {
188 return ADVERTISEMENT;
194 /** Decompress a JPEG2000 image to a bitmap.
195 * @param data JPEG2000 data.
196 * @param size Size of data in bytes.
197 * @param reduce A power of 2 by which to reduce the size of the decoded image;
198 * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
199 * 1 reduces by (2^1 == 2), ie halving the size of the image.
200 * This is useful for scaling 4K DCP images down to 2K.
203 shared_ptr<dcp::XYZFrame>
204 dcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
206 opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
207 opj_dparameters_t parameters;
208 opj_set_default_decoder_parameters (¶meters);
209 parameters.cp_reduce = reduce;
210 opj_setup_decoder (decoder, ¶meters);
211 opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, data, size);
212 opj_image_t* image = opj_decode (decoder, cio);
214 opj_destroy_decompress (decoder);
216 boost::throw_exception (DCPReadError (String::compose ("could not decode JPEG2000 codestream of %1 bytes.", size)));
219 opj_destroy_decompress (decoder);
222 image->x1 = rint (float(image->x1) / pow (2, reduce));
223 image->y1 = rint (float(image->y1) / pow (2, reduce));
224 return shared_ptr<XYZFrame> (new XYZFrame (image));
227 /** @param s A string.
228 * @return true if the string contains only space, newline or tab characters, or is empty.
231 dcp::empty_or_white_space (string s)
233 for (size_t i = 0; i < s.length(); ++i) {
234 if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
242 /** Set up various bits that the library needs. Should be called one
243 * by client applications.
248 if (xmlSecInit() < 0) {
249 throw MiscError ("could not initialise xmlsec");
252 #ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
253 if (xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) {
254 throw MiscError ("unable to load default xmlsec-crypto library");
258 if (xmlSecCryptoAppInit(0) < 0) {
259 throw MiscError ("could not initialise crypto");
262 if (xmlSecCryptoInit() < 0) {
263 throw MiscError ("could not initialise xmlsec-crypto");
267 bool dcp::operator== (dcp::Size const & a, dcp::Size const & b)
269 return (a.width == b.width && a.height == b.height);
272 bool dcp::operator!= (dcp::Size const & a, dcp::Size const & b)
277 ostream& dcp::operator<< (ostream& s, dcp::Size const & a)
279 s << a.width << "x" << a.height;
283 /** Decode a base64 string. The base64 decode routine in KM_util.cpp
284 * gives different values to both this and the command-line base64
285 * for some inputs. Not sure why.
287 * @param in base64-encoded string.
288 * @param out Output buffer.
289 * @param out_length Length of output buffer.
290 * @return Number of characters written to the output buffer.
293 dcp::base64_decode (string const & in, unsigned char* out, int out_length)
295 BIO* b64 = BIO_new (BIO_f_base64 ());
297 /* This means the input should have no newlines */
298 BIO_set_flags (b64, BIO_FLAGS_BASE64_NO_NL);
300 /* Copy our input string, removing newlines */
301 char in_buffer[in.size() + 1];
303 for (size_t i = 0; i < in.size(); ++i) {
304 if (in[i] != '\n' && in[i] != '\r') {
309 BIO* bmem = BIO_new_mem_buf (in_buffer, p - in_buffer);
310 bmem = BIO_push (b64, bmem);
311 int const N = BIO_read (bmem, out, out_length);
317 /** Convert a struct tm to a string of the form
318 * 2014-01-26T21:39:00+01:00
319 * @param tm struct tm.
320 * @return Time as a string.
323 dcp::tm_to_string (struct tm* tm)
326 strftime (buffer, 64, "%Y-%m-%dT%H:%M:%S", tm);
331 offset = tm->tm_gmtoff / 60;
333 TIME_ZONE_INFORMATION tz;
334 GetTimeZoneInformation (&tz);
338 return string (buffer) + utc_offset_to_string (offset);
341 /** @param b Offset from UTC to local time in minutes.
342 * @return string of the form e.g. -01:00.
345 dcp::utc_offset_to_string (int b)
347 bool const negative = (b < 0);
348 b = negative ? -b : b;
350 int const hours = b / 60;
351 int const minutes = b % 60;
360 o << setw(2) << setfill('0') << hours << ":" << setw(2) << setfill('0') << minutes;
364 /** Convert a boost::posix_time::ptime to a string of the form
365 * 2014-01-26T21:39:00+01:00.
366 * @param t boost::posix_time::ptime.
367 * @return Time as a string.
370 dcp::ptime_to_string (boost::posix_time::ptime t)
372 struct tm t_tm = boost::posix_time::to_tm (t);
373 return tm_to_string (&t_tm);
377 /** @param p Path to open.
378 * @param t mode flags, as for fopen(3).
379 * @return FILE pointer or 0 on error.
381 * Apparently there is no way to create an ofstream using a UTF-8
382 * filename under Windows. We are hence reduced to using fopen
386 dcp::fopen_boost (boost::filesystem::path p, string t)
388 #ifdef LIBDCP_WINDOWS
389 wstring w (t.begin(), t.end());
390 /* c_str() here should give a UTF-16 string */
391 return _wfopen (p.c_str(), w.c_str ());
393 return fopen (p.c_str(), t.c_str ());
397 optional<boost::filesystem::path>
398 dcp::relative_to_root (boost::filesystem::path root, boost::filesystem::path file)
400 boost::filesystem::path::const_iterator i = root.begin ();
401 boost::filesystem::path::const_iterator j = file.begin ();
403 while (i != root.end() && j != file.end() && *i == *j) {
408 if (i != root.end ()) {
409 return optional<boost::filesystem::path> ();
412 boost::filesystem::path rel;
413 while (j != file.end ()) {