Add the 3.3.3 sources for class-dump.

class-dump/src/CDDataCursor.m

+// -*- mode: ObjC -*-
+
+//  This file is part of class-dump, a utility for examining the Objective-C segment of Mach-O files.
+//  Copyright (C) 1997-1998, 2000-2001, 2004-2010 Steve Nygard.
+
+#import "CDDataCursor.h"
+
+@implementation CDDataCursor
+
+- (id)initWithData:(NSData *)someData;
+{
+    if ([super init] == nil)
+        return nil;
+
+    data = [someData retain];
+    offset = 0;
+    byteOrder = CDByteOrderLittleEndian;
+
+    return self;
+}
+
+- (void)dealloc;
+{
+    [data release];
+
+    [super dealloc];
+}
+
+- (NSData *)data;
+{
+    return data;
+}
+
+- (const void *)bytes;
+{
+    return [data bytes];
+}
+
+- (NSUInteger)offset;
+{
+    return offset;
+}
+
+// Return NO on failure.
+- (void)setOffset:(NSUInteger)newOffset;
+{
+    if (newOffset <= [data length]) {
+        offset = newOffset;
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to seek past end of data."];
+    }
+}
+
+- (void)advanceByLength:(NSUInteger)length;
+{
+    [self setOffset:offset + length];
+}
+
+- (NSUInteger)remaining;
+{
+    return [data length] - offset;
+}
+
+- (uint8_t)readByte;
+{
+    const uint8_t *ptr;
+
+    ptr = [data bytes] + offset;
+    offset += 1;
+
+    return *ptr;
+}
+
+- (uint16_t)readLittleInt16;
+{
+    uint16_t result;
+
+    if (offset + sizeof(result) <= [data length]) {
+        result = OSReadLittleInt16([data bytes], offset);
+        offset += sizeof(result);
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+        result = 0;
+    }
+
+    return result;
+}
+
+- (uint32_t)readLittleInt32;
+{
+    uint32_t result;
+
+    if (offset + sizeof(result) <= [data length]) {
+        result = OSReadLittleInt32([data bytes], offset);
+        offset += sizeof(result);
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+        result = 0;
+    }
+
+    return result;
+}
+
+- (uint64_t)readLittleInt64;
+{
+    uint64_t result;
+
+    if (offset + sizeof(result) <= [data length]) {
+        result = OSReadLittleInt64([data bytes], offset);
+        offset += sizeof(result);
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+        result = 0;
+    }
+
+    return result;
+}
+
+- (uint16_t)readBigInt16;
+{
+    uint16_t result;
+
+    if (offset + sizeof(result) <= [data length]) {
+        result = OSReadBigInt16([data bytes], offset);
+        offset += sizeof(result);
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+        result = 0;
+    }
+
+    return result;
+}
+
+- (uint32_t)readBigInt32;
+{
+    uint32_t result;
+
+    if (offset + sizeof(result) <= [data length]) {
+        result = OSReadBigInt32([data bytes], offset);
+        offset += sizeof(result);
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+        result = 0;
+    }
+
+    return result;
+}
+
+- (uint64_t)readBigInt64;
+{
+    uint64_t result;
+
+    if (offset + sizeof(result) <= [data length]) {
+        result = OSReadBigInt64([data bytes], offset);
+        offset += sizeof(result);
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+        result = 0;
+    }
+
+    return result;
+}
+
+- (float)readLittleFloat32;
+{
+    uint32_t val;
+
+    val = [self readLittleInt32];
+    return *(float *)&val;
+}
+
+- (float)readBigFloat32;
+{
+    uint32_t val;
+
+    val = [self readBigInt32];
+    return *(float *)&val;
+}
+
+- (double)readLittleFloat64;
+{
+    uint32_t v1, v2, *ptr;
+    double dval;
+
+    v1 = [self readLittleInt32];
+    v2 = [self readLittleInt32];
+    ptr = (uint32_t *)&dval;
+    *ptr++ = v1;
+    *ptr = v2;
+
+    return dval;
+}
+
+- (void)appendBytesOfLength:(NSUInteger)length intoData:(NSMutableData *)targetData;
+{
+    if (offset + length <= [data length]) {
+        [targetData appendBytes:[data bytes] + offset length:length];
+        offset += length;
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+    }
+}
+
+- (void)readBytesOfLength:(NSUInteger)length intoBuffer:(void *)buf;
+{
+    if (offset + length <= [data length]) {
+        memcpy(buf, [data bytes] + offset, length);
+        offset += length;
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+    }
+}
+
+- (BOOL)isAtEnd;
+{
+    return offset >= [data length];
+}
+
+- (CDByteOrder)byteOrder;
+{
+    return byteOrder;
+}
+
+- (void)setByteOrder:(CDByteOrder)newByteOrder;
+{
+    byteOrder = newByteOrder;
+}
+
+//
+// Read using the current byteOrder
+//
+
+- (uint16_t)readInt16;
+{
+    if (byteOrder == CDByteOrderLittleEndian)
+        return [self readLittleInt16];
+
+    return [self readBigInt16];
+}
+
+- (uint32_t)readInt32;
+{
+    if (byteOrder == CDByteOrderLittleEndian)
+        return [self readLittleInt32];
+
+    return [self readBigInt32];
+}
+
+- (uint64_t)readInt64;
+{
+    if (byteOrder == CDByteOrderLittleEndian)
+        return [self readLittleInt64];
+
+    return [self readBigInt64];
+}
+
+- (uint32_t)peekInt32;
+{
+    NSUInteger savedOffset;
+    uint32_t val;
+
+    savedOffset = offset;
+    val = [self readInt32];
+    offset = savedOffset;
+
+    return val;
+}
+
+- (NSString *)readCString;
+{
+    return [self readStringOfLength:strlen([data bytes] + offset) encoding:NSASCIIStringEncoding];
+}
+
+- (NSString *)readStringOfLength:(NSUInteger)length encoding:(NSStringEncoding)encoding;
+{
+    if (offset + length <= [data length]) {
+        NSString *str;
+
+        if (encoding == NSASCIIStringEncoding) {
+            char *buf;
+
+            // Jump through some hoops if the length is padded with zero bytes, as in the case of 10.5's Property List Editor and iSync Plug-in Maker.
+            buf = malloc(length + 1);
+            if (buf == NULL) {
+                NSLog(@"Error: malloc() failed.");
+                return nil;
+            }
+
+            strncpy(buf, [data bytes] + offset, length);
+            buf[length] = 0;
+
+            str = [[[NSString alloc] initWithBytes:buf length:strlen(buf) encoding:encoding] autorelease];
+            offset += length;
+            free(buf);
+            return str;
+        } else {
+            str = [[[NSString alloc] initWithBytes:[data bytes] + offset length:length encoding:encoding] autorelease];;
+            offset += length;
+            return str;
+        }
+    } else {
+        [NSException raise:NSRangeException format:@"Trying to read past end in %s", _cmd];
+    }
+
+    return nil;
+}
+
+@end