cog/Plugins/APL/APLFile.m

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#import "APLFile.h"
#import "ApeTag.h"
@implementation APLFile
+createWithFile:(NSString*)f { return [[APLFile alloc] initWithFile:f]; }
-(NSString*) readline:(NSFileHandle*)f { // rather hack-style substitution to fgets...
NSMutableData* d = [NSMutableData dataWithCapacity:100]; //it will grow, here should be most expected value (may gain few nanosecond from it =) )
while(true) {
NSData* byte = [f readDataOfLength:1];
if (!byte)
{
[f seekToFileOffset:([f offsetInFile]-[d length])];
return nil;
}
[d appendData:byte];
if (*((const char*)[byte bytes]) == '\n') break;
}
NSString* s = [[NSString alloc] initWithData:d encoding:NSUTF8StringEncoding]; //!handle encoding error (in case binary data starts not from newline, impossible on real apl, but who knows...)
return s;
}
- (NSURL *)urlForPath:(NSString *)path relativeTo:(NSString *)baseFilename
{
NSRange protocolRange = [path rangeOfString:@"://"];
if (protocolRange.location != NSNotFound)
return [NSURL URLWithString:path];
NSMutableString *unixPath = [path mutableCopy];
if (![unixPath hasPrefix:@"/"]) {
//Only relative paths would have windows backslashes.
[unixPath replaceOccurrencesOfString:@"\\" withString:@"/" options:0 range:NSMakeRange(0, [unixPath length])];
NSString *basePath = [[[baseFilename stringByStandardizingPath] stringByDeletingLastPathComponent] stringByAppendingString:@"/"];
[unixPath insertString:basePath atIndex:0];
}
NSURL *url = [NSURL URLWithString:[[NSURL fileURLWithPath:unixPath] absoluteString]];
[unixPath release];
return url;
}
-initWithFile:(NSString*)filename {
self = [super init];
if (self)
{
//startBlock must be always >= 0
NSFileHandle* f = (NSFileHandle*)[NSFileHandle fileHandleForReadingAtPath:filename];
if(!f){
NSLog(@"Failed to open apl file '%@' for reading", f);
return nil;
}
NSString* header = @"[Monkey's Audio Image Link File]\r\n";
NSData* da = [f readDataOfLength:[header length]];
if (!da) {
NSLog(@"Cannot read header");
return nil;
}
NSString* str = [[[NSString alloc] autorelease] initWithData:da encoding: NSASCIIStringEncoding];
if([str compare:header options:NSCaseInsensitiveSearch]) {
NSLog(@"APL header mismatch");
return nil;
}
//now read by lines, skip empty, up to line <tagline> (or any starting with '-' - may be other tags can be present)
NSString* line = nil;
NSScanner *scanner = nil;
//NSCharacterSet *whitespace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
while(line = [self readline:f]) {
if (![line compare:@"----- APE TAG (DO NOT TOUCH!!!) -----\r\n" options:NSCaseInsensitiveSearch]) break;
if([line characterAtIndex:0] == '-') break;
[scanner release];
scanner = [[NSScanner alloc] initWithString:line];
NSString* field = nil, *value = nil;
if (![scanner scanUpToString:@"=" intoString:&field]) continue;
if (![scanner scanString:@"=" intoString:nil]) continue;
if (![scanner scanUpToString:@"\r\n" intoString:&value]) continue;
if (![field compare:@"Image File" options:NSCaseInsensitiveSearch])
{
[file release];
file = [self urlForPath:value relativeTo:filename];
NSLog(@"APL refers to file '%@' read '%@'", file, value);
continue;
}
if (![field compare:@"Start Block" options:NSCaseInsensitiveSearch])
{
startBlock = [value intValue]; //!!! bugs with files over 2GB
//NSLog(@"APL start block %d (%@)", startBlock, value);
continue;
}
if (![field compare:@"Finish Block" options:NSCaseInsensitiveSearch])
{
endBlock = [value intValue]; //!!! bugs with files over 2GB
//NSLog(@"APL start block %d (%@)", endBlock, value);
continue;
}
}
[scanner release];
//check here for EOF? cocoa does not have this functionality :(
tag = [ApeTag createFromFileRead:f];
[f closeFile];
}
return self;
}
-(long)startBlock { return startBlock; }
-(long)endBlock { return endBlock; }
-(ApeTag*) tag { return tag; }
-(NSURL*) file { return file; }
@end