diff options
Diffstat (limited to 'src/ai/ai_scanner.cpp')
| -rw-r--r-- | src/ai/ai_scanner.cpp | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/src/ai/ai_scanner.cpp b/src/ai/ai_scanner.cpp index 11f4cdafd..be0dfa59d 100644 --- a/src/ai/ai_scanner.cpp +++ b/src/ai/ai_scanner.cpp @@ -416,3 +416,141 @@ char *AIScanner::GetAIConsoleList(char *p, const char *last) return p; } + +#if defined(ENABLE_NETWORK) +#include "../network/network_content.h" +#include "../md5.h" +#include "../tar_type.h" + +/** Helper for creating a MD5sum of all files within of an AI. */ +struct AIFileChecksumCreator : FileScanner { + byte md5sum[16]; ///< The final md5sum + + /** + * Initialise the md5sum to be all zeroes, + * so we can easily xor the data. + */ + AIFileChecksumCreator() + { + memset(this->md5sum, 0, sizeof(this->md5sum)); + } + + /* Add the file and calculate the md5 sum. */ + virtual bool AddFile(const char *filename, size_t basepath_length) + { + Md5 checksum; + uint8 buffer[1024]; + size_t len, size; + byte tmp_md5sum[16]; + + /* Open the file ... */ + FILE *f = FioFOpenFile(filename, "rb", DATA_DIR, &size); + if (f == NULL) return false; + + /* ... calculate md5sum... */ + while ((len = fread(buffer, 1, (size > sizeof(buffer)) ? sizeof(buffer) : size, f)) != 0 && size != 0) { + size -= len; + checksum.Append(buffer, len); + } + checksum.Finish(tmp_md5sum); + + FioFCloseFile(f); + + /* ... and xor it to the overall md5sum. */ + for (uint i = 0; i < sizeof(md5sum); i++) this->md5sum[i] ^= tmp_md5sum[i]; + + return true; + } +}; + +/** + * Check whether the AI given in info is the same as in ci based + * on the shortname and md5 sum. + * @param ci the information to compare to + * @param md5sum whether to check the MD5 checksum + * @param info the AI to get the shortname and md5 sum from + * @return true iff they're the same + */ +static bool IsSameAI(const ContentInfo *ci, bool md5sum, AIFileInfo *info) +{ + uint32 id = 0; + const char *str = info->GetShortName(); + for (int j = 0; j < 4 && *str != '\0'; j++, str++) id |= *str << (8 * j); + + if (id != ci->unique_id) return false; + if (!md5sum) return true; + + AIFileChecksumCreator checksum; + char path[MAX_PATH]; + strecpy(path, info->GetMainScript(), lastof(path)); + /* There'll always be at least 2 path separator characters in an AI's + * main script name as the search algorithm requires the main script to + * be in a subdirectory of the AI directory; so ai/<path>/main.nut. */ + *strrchr(path, PATHSEPCHAR) = '\0'; + *strrchr(path, PATHSEPCHAR) = '\0'; + TarList::iterator iter = _tar_list.find(path); + + if (iter != _tar_list.end()) { + /* The main script is in a tar file, so find all files that + * are in the same tar and add them to the MD5 checksumming. */ + TarFileList::iterator tar; + FOR_ALL_TARS(tar) { + /* Not in the same tar. */ + if (tar->second.tar_filename != iter->first) continue; + + /* Check the extension. */ + const char *ext = strrchr(tar->first.c_str(), '.'); + if (ext == NULL || strcasecmp(ext, ".nut") != 0) continue; + + /* Create the full path name, */ + seprintf(path, lastof(path), "%s%c%s", tar->second.tar_filename, PATHSEPCHAR, tar->first.c_str()); + checksum.AddFile(path, 0); + } + } else { + /* Add the path sep char back when searching a directory, so we are + * in the actual directory. */ + path[strlen(path)] = PATHSEPCHAR; + checksum.Scan(".nut", path); + } + + return memcmp(ci->md5sum, checksum.md5sum, sizeof(ci->md5sum)) == 0; +} + +/** + * Check whether we have an AI (library) with the exact characteristics as ci. + * @param ci the characteristics to search on (shortname and md5sum) + * @param md5sum whether to check the MD5 checksum + * @return true iff we have an AI (library) matching. + */ +bool AIScanner::HasAI(const ContentInfo *ci, bool md5sum) +{ + switch (ci->type) { + case CONTENT_TYPE_AI: + for (AIInfoList::iterator it = this->info_list.begin(); it != this->info_list.end(); it++) { + if (IsSameAI(ci, md5sum, (*it).second)) return true; + } + return false; + + case CONTENT_TYPE_AI_LIBRARY: + for (AILibraryList::iterator it = this->library_list.begin(); it != this->library_list.end(); it++) { + if (IsSameAI(ci, md5sum, (*it).second)) return true; + } + return false; + + default: + NOT_REACHED(); + } +} + +/** + * Check whether we have an AI (library) with the exact characteristics as ci. + * @param ci the characteristics to search on (shortname and md5sum) + * @param md5sum whether to check the MD5 checksum + * @return true iff we have an AI (library) matching. + */ +/*static */ bool AI::HasAI(const ContentInfo *ci, bool md5sum) +{ + return AI::ai_scanner->HasAI(ci, md5sum); +} + +#endif /* ENABLE_NETWORK */ |