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;
57 using boost::shared_ptr;
68 Kumu::GenRandomValue (id);
69 id.EncodeHex (buffer, 64);
70 return string (buffer);
74 /** Create a digest for a file.
75 * @param filename File name.
76 * @param progress Pointer to a progress reporting function, or 0. The function will be called
77 * with a progress value between 0 and 1.
81 dcp::make_digest (boost::filesystem::path filename, boost::function<void (float)>* progress)
83 Kumu::FileReader reader;
84 Kumu::Result_t r = reader.OpenRead (filename.string().c_str ());
85 if (ASDCP_FAILURE (r)) {
86 boost::throw_exception (FileError ("could not open file to compute digest", filename, r));
92 int const buffer_size = 65536;
93 Kumu::ByteString read_buffer (buffer_size);
95 Kumu::fsize_t done = 0;
96 Kumu::fsize_t const size = reader.Size ();
99 Kumu::Result_t r = reader.Read (read_buffer.Data(), read_buffer.Capacity(), &read);
101 if (r == Kumu::RESULT_ENDOFFILE) {
103 } else if (ASDCP_FAILURE (r)) {
104 boost::throw_exception (FileError ("could not read file to compute digest", filename, r));
107 SHA1_Update (&sha, read_buffer.Data(), read);
110 (*progress) (float (done) / size);
115 byte_t byte_buffer[SHA_DIGEST_LENGTH];
116 SHA1_Final (byte_buffer, &sha);
119 return Kumu::base64encode (byte_buffer, SHA_DIGEST_LENGTH, digest, 64);
122 /** Convert a content kind to a string which can be used in a
123 * <ContentKind> node.
124 * @param kind ContentKind.
128 dcp::content_kind_to_string (ContentKind kind)
140 return "transitional";
147 case PUBLIC_SERVICE_ANNOUNCEMENT:
150 return "advertisement";
156 /** Convert a string from a <ContentKind> node to a libdcp ContentKind.
157 * Reasonably tolerant about varying case.
158 * @param kind Content kind string.
159 * @return libdcp ContentKind.
162 dcp::content_kind_from_string (string kind)
164 transform (kind.begin(), kind.end(), kind.begin(), ::tolower);
166 if (kind == "feature") {
168 } else if (kind == "short") {
170 } else if (kind == "trailer") {
172 } else if (kind == "test") {
174 } else if (kind == "transitional") {
176 } else if (kind == "rating") {
178 } else if (kind == "teaser") {
180 } else if (kind == "policy") {
182 } else if (kind == "psa") {
183 return PUBLIC_SERVICE_ANNOUNCEMENT;
184 } else if (kind == "advertisement") {
185 return ADVERTISEMENT;
191 /** Decompress a JPEG2000 image to a bitmap.
192 * @param data JPEG2000 data.
193 * @param size Size of data in bytes.
194 * @param reduce A power of 2 by which to reduce the size of the decoded image;
195 * e.g. 0 reduces by (2^0 == 1), ie keeping the same size.
196 * 1 reduces by (2^1 == 2), ie halving the size of the image.
197 * This is useful for scaling 4K DCP images down to 2K.
200 shared_ptr<dcp::XYZFrame>
201 dcp::decompress_j2k (uint8_t* data, int64_t size, int reduce)
203 opj_dinfo_t* decoder = opj_create_decompress (CODEC_J2K);
204 opj_dparameters_t parameters;
205 opj_set_default_decoder_parameters (¶meters);
206 parameters.cp_reduce = reduce;
207 opj_setup_decoder (decoder, ¶meters);
208 opj_cio_t* cio = opj_cio_open ((opj_common_ptr) decoder, data, size);
209 opj_image_t* image = opj_decode (decoder, cio);
211 opj_destroy_decompress (decoder);
213 boost::throw_exception (DCPReadError (String::compose ("could not decode JPEG2000 codestream of %1 bytes.", size)));
216 opj_destroy_decompress (decoder);
219 image->x1 = rint (float(image->x1) / pow (2, reduce));
220 image->y1 = rint (float(image->y1) / pow (2, reduce));
221 return shared_ptr<XYZFrame> (new XYZFrame (image));
224 /** @param s A string.
225 * @return true if the string contains only space, newline or tab characters, or is empty.
228 dcp::empty_or_white_space (string s)
230 for (size_t i = 0; i < s.length(); ++i) {
231 if (s[i] != ' ' && s[i] != '\n' && s[i] != '\t') {
239 /** Set up various bits that the library needs. Should be called one
240 * by client applications.
245 if (xmlSecInit() < 0) {
246 throw MiscError ("could not initialise xmlsec");
249 #ifdef XMLSEC_CRYPTO_DYNAMIC_LOADING
250 if (xmlSecCryptoDLLoadLibrary(BAD_CAST XMLSEC_CRYPTO) < 0) {
251 throw MiscError ("unable to load default xmlsec-crypto library");
255 if (xmlSecCryptoAppInit(0) < 0) {
256 throw MiscError ("could not initialise crypto");
259 if (xmlSecCryptoInit() < 0) {
260 throw MiscError ("could not initialise xmlsec-crypto");
264 bool dcp::operator== (dcp::Size const & a, dcp::Size const & b)
266 return (a.width == b.width && a.height == b.height);
269 bool dcp::operator!= (dcp::Size const & a, dcp::Size const & b)
274 /** Decode a base64 string. The base64 decode routine in KM_util.cpp
275 * gives different values to both this and the command-line base64
276 * for some inputs. Not sure why.
278 * @param in base64-encoded string.
279 * @param out Output buffer.
280 * @param out_length Length of output buffer.
281 * @return Number of characters written to the output buffer.
284 dcp::base64_decode (string const & in, unsigned char* out, int out_length)
286 BIO* b64 = BIO_new (BIO_f_base64 ());
288 /* This means the input should have no newlines */
289 BIO_set_flags (b64, BIO_FLAGS_BASE64_NO_NL);
291 /* Copy our input string, removing newlines */
292 char in_buffer[in.size() + 1];
294 for (size_t i = 0; i < in.size(); ++i) {
295 if (in[i] != '\n' && in[i] != '\r') {
300 BIO* bmem = BIO_new_mem_buf (in_buffer, p - in_buffer);
301 bmem = BIO_push (b64, bmem);
302 int const N = BIO_read (bmem, out, out_length);
308 /** Convert a struct tm to a string of the form
309 * 2014-01-26T21:39:00+01:00
310 * @param tm struct tm.
311 * @return Time as a string.
314 dcp::tm_to_string (struct tm* tm)
317 strftime (buffer, 64, "%Y-%m-%dT%H:%M:%S", tm);
322 offset = tm->tm_gmtoff / 60;
324 TIME_ZONE_INFORMATION tz;
325 GetTimeZoneInformation (&tz);
329 return string (buffer) + utc_offset_to_string (offset);
332 /** @param b Offset from UTC to local time in minutes.
333 * @return string of the form e.g. -01:00.
336 dcp::utc_offset_to_string (int b)
338 bool const negative = (b < 0);
339 b = negative ? -b : b;
341 int const hours = b / 60;
342 int const minutes = b % 60;
351 o << setw(2) << setfill('0') << hours << ":" << setw(2) << setfill('0') << minutes;
355 /** Convert a boost::posix_time::ptime to a string of the form
356 * 2014-01-26T21:39:00+01:00.
357 * @param t boost::posix_time::ptime.
358 * @return Time as a string.
361 dcp::ptime_to_string (boost::posix_time::ptime t)
363 struct tm t_tm = boost::posix_time::to_tm (t);
364 return tm_to_string (&t_tm);
368 /** @param p Path to open.
369 * @param t mode flags, as for fopen(3).
370 * @return FILE pointer or 0 on error.
372 * Apparently there is no way to create an ofstream using a UTF-8
373 * filename under Windows. We are hence reduced to using fopen
377 dcp::fopen_boost (boost::filesystem::path p, string t)
379 #ifdef LIBDCP_WINDOWS
380 wstring w (t.begin(), t.end());
381 /* c_str() here should give a UTF-16 string */
382 return _wfopen (p.c_str(), w.c_str ());
384 return fopen (p.c_str(), t.c_str ());
388 boost::optional<boost::filesystem::path>
389 dcp::relative_to_root (boost::filesystem::path root, boost::filesystem::path file)
391 boost::filesystem::path::const_iterator i = root.begin ();
392 boost::filesystem::path::const_iterator j = file.begin ();
394 while (i != root.end() && j != file.end() && *i == *j) {
399 if (i != root.end ()) {
400 return boost::optional<boost::filesystem::path> ();
403 boost::filesystem::path rel;
404 while (j != file.end ()) {