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/* gst-matcher.cpp - Match GStreamer packages
*
* Copyright (c) 2010-2016 Daniel Nicoletti <dantti12@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gst-matcher.h"
#include "apt-utils.h"
#include <regex.h>
#include <gst/gst.h>
static bool inited = false;
GstMatcher::GstMatcher(gchar **values)
{
if (!inited) {
gst_init(NULL, NULL);
inited = true;
}
// The search term from PackageKit daemon:
// gstreamer0.10(urisource-foobar)
// gstreamer0.10(decoder-audio/x-wma)(wmaversion=3)
const char *pkreg =
"^gstreamer\\(0.10\\|1\\)\\(\\.0\\)\\?"
"(\\(encoder\\|decoder\\|urisource\\|urisink\\|element\\)-\\([^)]\\+\\))"
"\\((.*)\\)\\?";
regex_t pkre;
if (regcomp(&pkre, pkreg, 0) != 0) {
g_debug("Regex compilation error: %s", pkreg);
return;
}
gchar *value;
for (uint i = 0; i < g_strv_length(values); ++i) {
value = values[i];
regmatch_t matches[6];
if (regexec(&pkre, value, 6, matches, 0) != REG_NOMATCH) {
Match mvals;
string version, type, data, opt;
bool native = false;
// Appends the version "0.10"
version = "\nGstreamer-Version: ";
version.append(string(value, matches[1].rm_so, matches[1].rm_eo - matches[1].rm_so));
// type (encode|decoder...)
type = string(value, matches[3].rm_so, matches[3].rm_eo - matches[3].rm_so);
// data "audio/x-wma"
data = string(value, matches[4].rm_so, matches[4].rm_eo - matches[4].rm_so);
// opt "wmaversion=3"
if (matches[5].rm_so != -1) {
// remove the '(' ')' that the regex matched
opt = string(value, matches[5].rm_so + 1, matches[5].rm_eo - matches[5].rm_so - 2);
if (!opt.empty()) {
size_t start_pos = 0;
// This is hardcoded in pk-gstreamer-install, so we also hardcode it here
const string arch_64 = ")(64bit";
if (ends_with(opt.c_str(), arch_64.c_str())) {
/* The ()(64bit) suffix is an RPM artifact, where it is used to distinguish
* between the primary and secondary architecture in a 2-arch system.
* It doesn't translate precisely to DPKG, where multi-arch is not limited
* to one secondary architecture. Let's use it the same way RPM would and
* only match the native arch.
*/
native = true;
opt.erase(opt.end() - arch_64.length(), opt.end());
}
// Replace all ")(" with "," - convert from input to serialized caps format
while ((start_pos = opt.find(")(", start_pos)) != string::npos) {
if (start_pos == opt.length() - 2) {
// Avoid trailing comma
opt.erase(start_pos, 2);
break;
}
opt.replace(start_pos, 2, ",");
start_pos++;
}
}
}
if (type.compare("encoder") == 0) {
type = "Gstreamer-Encoders: ";
} else if (type.compare("decoder") == 0) {
type = "Gstreamer-Decoders: ";
} else if (type.compare("urisource") == 0) {
type = "Gstreamer-Uri-Sources: ";
} else if (type.compare("urisink") == 0) {
type = "Gstreamer-Uri-Sinks: ";
} else if (type.compare("element") == 0) {
type = "Gstreamer-Elements: ";
}
gchar *capsString;
if (opt.empty()) {
capsString = g_strdup_printf("%s", data.c_str());
} else {
capsString = g_strdup_printf("%s, %s", data.c_str(), opt.c_str());
}
GstCaps *caps = gst_caps_from_string(capsString);
g_free(capsString);
if (caps == NULL) {
continue;
}
mvals.version = version;
mvals.type = type;
mvals.data = data;
mvals.opt = opt;
mvals.caps = caps;
mvals.native = native;
m_matches.push_back(mvals);
} else {
g_debug("gstmatcher: Did not match: %s", value);
}
}
regfree(&pkre);
}
GstMatcher::~GstMatcher()
{
for (const Match &match : m_matches) {
gst_caps_unref(static_cast<GstCaps *>(match.caps));
}
}
bool GstMatcher::matches(string record, bool native)
{
for (const Match &match : m_matches) {
// Tries to find "Gstreamer-version: xxx"
if (record.find(match.version) != string::npos) {
size_t found;
if (match.native && !native)
continue;
found = record.find(match.type);
// Tries to find the type "Gstreamer-Uri-Sinks: "
if (found != string::npos) {
found += match.type.size(); // skips the "Gstreamer-Uri-Sinks: " string
size_t endOfLine;
endOfLine = record.find('\n', found);
GstCaps *caps;
caps = gst_caps_from_string(record.substr(found, endOfLine - found).c_str());
if (caps == NULL) {
continue;
}
// if the record is capable of intersect them we found the package
bool provides = gst_caps_can_intersect(static_cast<GstCaps *>(match.caps), caps);
gst_caps_unref(caps);
if (provides) {
return true;
}
}
}
}
return false;
}
bool GstMatcher::hasMatches() const
{
return !m_matches.empty();
}
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