bool Caching_Stream::open(const Input_Stream_Position& position)
{
bool status;
if (CFURLResourceIsReachable(m_metaDataUrl, NULL) &&
CFURLResourceIsReachable(m_fileUrl, NULL)) {
m_cacheable = false;
m_writable = false;
m_useCache = true;
m_cacheMetaDataWritten = false;
readMetaData();
CS_TRACE("Playing file from cache\n");
CS_TRACE_CFURL(m_fileUrl);
status = m_fileStream->open(position);
} else {
m_cacheable = false;
m_writable = false;
m_useCache = false;
m_cacheMetaDataWritten = false;
CS_TRACE("File not cached\n");
status = m_target->open(position);
}
return status;
}
Boolean path_exists(CFTypeRef path) {
if (CFGetTypeID(path) == CFStringGetTypeID()) {
CFURLRef url = CFURLCreateWithFileSystemPath(NULL, path, kCFURLPOSIXPathStyle, true);
Boolean result = CFURLResourceIsReachable(url, NULL);
CFRelease(url);
return result;
} else if (CFGetTypeID(path) == CFURLGetTypeID()) {
return CFURLResourceIsReachable(path, NULL);
} else {
return false;
}
}
// Resolve a path and append it to the CLI settings structure
// The FSEvents API will, internally, resolve paths using a similar scheme.
// Performing this ahead of time makes things less confusing, IMHO.
static void append_path(const char* path)
{
#ifdef DEBUG
fprintf(stderr, "\n");
fprintf(stderr, "append_path called for: %s\n", path);
#endif
#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
#ifdef DEBUG
fprintf(stderr, "compiled against 10.6+, using CFURLCreateFileReferenceURL\n");
#endif
CFURLRef url = CFURLCreateFromFileSystemRepresentation(NULL, (const UInt8*)path, (CFIndex)strlen(path), false);
CFURLRef placeholder = CFURLCopyAbsoluteURL(url);
CFRelease(url);
CFMutableArrayRef imaginary = NULL;
// if we don't have an existing url, spin until we get to a parent that
// does exist, saving any imaginary components for appending back later
while(!CFURLResourceIsReachable(placeholder, NULL)) {
#ifdef DEBUG
fprintf(stderr, "path does not exist\n");
#endif
CFStringRef child;
if (imaginary == NULL) {
imaginary = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
}
child = CFURLCopyLastPathComponent(placeholder);
CFArrayInsertValueAtIndex(imaginary, 0, child);
CFRelease(child);
url = CFURLCreateCopyDeletingLastPathComponent(NULL, placeholder);
CFRelease(placeholder);
placeholder = url;
#ifdef DEBUG
fprintf(stderr, "parent: ");
CFShow(placeholder);
#endif
}
#ifdef DEBUG
fprintf(stderr, "path exists\n");
#endif
// realpath() doesn't always return the correct case for a path, so this
// is a funky workaround that converts a path into a (volId/inodeId) pair
// and asks what the path should be for that. since it looks at the actual
// inode instead of returning the same case passed in like realpath()
// appears to do for HFS+, it should always be correct.
url = CFURLCreateFileReferenceURL(NULL, placeholder, NULL);
CFRelease(placeholder);
placeholder = CFURLCreateFilePathURL(NULL, url, NULL);
CFRelease(url);
#ifdef DEBUG
fprintf(stderr, "path resolved to: ");
CFShow(placeholder);
#endif
// if we stripped off any imaginary path components, append them back on
if (imaginary != NULL) {
CFIndex count = CFArrayGetCount(imaginary);
for (CFIndex i = 0; i<count; i++) {
CFStringRef component = CFArrayGetValueAtIndex(imaginary, i);
#ifdef DEBUG
fprintf(stderr, "appending component: ");
CFShow(component);
#endif
url = CFURLCreateCopyAppendingPathComponent(NULL, placeholder, component, false);
CFRelease(placeholder);
placeholder = url;
}
CFRelease(imaginary);
}
#ifdef DEBUG
fprintf(stderr, "result: ");
CFShow(placeholder);
#endif
CFStringRef cfPath = CFURLCopyFileSystemPath(placeholder, kCFURLPOSIXPathStyle);
CFArrayAppendValue(config.paths, cfPath);
CFRelease(cfPath);
CFRelease(placeholder);
#else
#ifdef DEBUG
fprintf(stderr, "compiled against 10.5, using realpath()\n");
#endif
char fullPath[PATH_MAX + 1];
if (realpath(path, fullPath) == NULL) {
#ifdef DEBUG
fprintf(stderr, " realpath not directly resolvable from path\n");
#endif
if (path[0] != '/') {
#ifdef DEBUG
fprintf(stderr, " passed path is not absolute\n");
#endif
size_t len;
getcwd(fullPath, sizeof(fullPath));
#ifdef DEBUG
fprintf(stderr, " result of getcwd: %s\n", fullPath);
#endif
len = strlen(fullPath);
fullPath[len] = '/';
strlcpy(&fullPath[len + 1], path, sizeof(fullPath) - (len + 1));
} else {
#ifdef DEBUG
fprintf(stderr, " assuming path does not YET exist\n");
#endif
strlcpy(fullPath, path, sizeof(fullPath));
}
}
#ifdef DEBUG
fprintf(stderr, " resolved path to: %s\n", fullPath);
fprintf(stderr, "\n");
#endif
CFStringRef pathRef = CFStringCreateWithCString(kCFAllocatorDefault,
fullPath,
kCFStringEncodingUTF8);
CFArrayAppendValue(config.paths, pathRef);
CFRelease(pathRef);
#endif
}
