1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | <?php /** * Handles loading data from raw git objects * * @author Christopher Han <xiphux@gmail.com> * @copyright Copyright (c) 2012 Christopher Han * @package GitPHP * @subpackage Git */ class GitPHP_GitObjectLoader { /** * The project * * @var GitPHP_Project */ protected $project; /** * The list of packs * * @var GitPHP_Pack[] */ protected $packs = array(); /** * Whether packs have been read * * @var boolean */ protected $packsRead = false; /** * Constructor * * @param GitPHP_Project $project project */ public function __construct($project) { if (!$project) throw new Exception('Project is required'); $this->project = $project; } /** * Gets the project * * @return GitPHP_Project project */ public function GetProject() { return $this->project; } /** * Gets the raw content of an object * * @param string $hash object hash * @param int $type returns the object type * @return string object data */ public function GetObject($hash, &$type = 0) { if (!preg_match('/^[0-9A-Fa-f]{40}$/', $hash)) { return false; } if (GitPHP_DebugLog::GetInstance()->GetEnabled()) $autolog = new GitPHP_DebugAutoLog(); // first check if it's unpacked $path = $this->project->GetPath() . '/objects/' . substr($hash, 0, 2) . '/' . substr($hash, 2); if (file_exists($path)) { list($header, $data) = explode("\0", gzuncompress(file_get_contents($path)), 2); if (preg_match('/^([A-Za-z]+) /', $header, $typestr)) { switch ($typestr[1]) { case 'commit': $type = GitPHP_Pack::OBJ_COMMIT; break; case 'tree': $type = GitPHP_Pack::OBJ_TREE; break; case 'blob': $type = GitPHP_Pack::OBJ_BLOB; break; case 'tag': $type = GitPHP_Pack::OBJ_TAG; break; } } return $data; } if (!$this->packsRead) { $this->ReadPacks(); } // then try packs foreach ($this->packs as $pack) { $data = $pack->GetObject($hash, $type); if ($data !== false) { return $data; } } return false; } /** * Read the list of packs in the repository */ private function ReadPacks() { $dh = opendir($this->project->GetPath() . '/objects/pack'); if ($dh !== false) { while (($file = readdir($dh)) !== false) { if (preg_match('/^pack-([0-9A-Fa-f]{40})\.pack$/', $file, $regs)) { $this->packs[] = new GitPHP_Pack($this->project, $regs[1], $this); } } } $this->packsRead = true; } /** * Ensures a hash prefix is unique * * @param string $hash full hash * @param string $prefix abbreviated hash prefix */ public function EnsureUniqueHash($hash, $prefix) { if (empty($hash) || empty($prefix)) return null; if (!(preg_match('/[0-9A-Fa-f]{40}/', $hash))) return $hash; if (preg_match('/[0-9A-Fa-f]{40}/', $prefix)) return $prefix; $hashMap = array(); $matches = $this->FindHashObjects($prefix); foreach ($matches as $matchingHash) { $hashMap[$matchingHash] = 1; } if (!$this->packsRead) { $this->ReadPacks(); } foreach ($this->packs as $pack) { $matches = $pack->FindHashes($prefix); foreach ($matches as $matchingHash) { $hashMap[$matchingHash] = 1; } } if (count($hashMap) == 0) { return $hash; } if (count($hashMap) == 1) { return $prefix; } for ($len = strlen($prefix)+1; $len < 40; $len++) { $prefix = substr($hash, 0, $len); foreach (array_keys($hashMap) as $matchingHash) { if (substr_compare($matchingHash, $prefix, 0, $len) !== 0) { unset($hashMap[$matchingHash]); } } if (count($hashMap) == 1) { return $prefix; } } return $hash; } /** * Expands an abbreviated hash to the full hash * * @param string $abbrevHash abbreviated hash * @return string full hash */ public function ExpandHash($abbrevHash) { if (!(preg_match('/[0-9A-Fa-f]{4,39}/', $abbrevHash))) { return $abbrevHash; } $matches = $this->FindHashObjects($abbrevHash); if (!$this->packsRead) { $this->ReadPacks(); } foreach ($this->packs as $pack) { $matches = array_merge($matches, $pack->FindHashes($abbrevHash)); } $matches = array_unique($matches); if (count($matches) < 1) return $abbrevHash; if (count($matches) > 1) { throw new GitPHP_AmbiguousHashException($abbrevHash); } return $matches[0]; } /** * Finds loose hash files matching a given prefix * * @param string $prefix hash prefix * @return string[] array of hashes */ private function FindHashObjects($prefix) { $matches = array(); if (empty($prefix)) { return $matches; } $subdir = substr($prefix, 0, 2); $fulldir = $this->project->GetPath() . '/objects/' . $subdir; if (!is_dir($fulldir)) { return $matches; } $prefixlen = strlen($prefix); $dh = opendir($fulldir); if ($dh !== false) { while (($file = readdir($dh)) !== false) { $fullhash = $subdir . $file; if (substr_compare($fullhash, $prefix, 0, $prefixlen) === 0) { $matches[] = $fullhash; } } } return $matches; } } |