| // -*- mode: ObjC -*- |
| |
| // This file is part of class-dump, a utility for examining the Objective-C segment of Mach-O files. |
| // Copyright (C) 1997-2019 Steve Nygard. |
| |
| #import "CDMachOFileDataCursor.h" |
| |
| #import "CDMachOFile.h" |
| #import "CDLCSegment.h" |
| #import "CDSection.h" |
| |
| @implementation CDMachOFileDataCursor |
| { |
| __weak CDMachOFile *_machOFile; |
| NSUInteger _ptrSize; |
| CDByteOrder _byteOrder; |
| } |
| |
| - (id)initWithFile:(CDMachOFile *)machOFile; |
| { |
| return [self initWithFile:machOFile offset:0]; |
| } |
| |
| - (id)initWithFile:(CDMachOFile *)machOFile offset:(NSUInteger)offset; |
| { |
| if ((self = [super initWithData:machOFile.data])) { |
| self.machOFile = machOFile; |
| [self setOffset:offset]; |
| } |
| |
| return self; |
| } |
| |
| - (id)initWithFile:(CDMachOFile *)machOFile address:(NSUInteger)address; |
| { |
| if ((self = [super initWithData:machOFile.data])) { |
| self.machOFile = machOFile; |
| [self setAddress:address]; |
| } |
| |
| return self; |
| } |
| |
| - (id)initWithSection:(CDSection *)section; |
| { |
| if ((self = [super initWithData:[section data]])) { |
| self.machOFile = section.segment.machOFile; |
| } |
| |
| return self; |
| } |
| |
| #pragma mark - |
| |
| - (void)setMachOFile:(CDMachOFile *)machOFile; |
| { |
| _machOFile = machOFile; |
| _ptrSize = machOFile.ptrSize; |
| _byteOrder = machOFile.byteOrder; |
| } |
| |
| - (void)setAddress:(NSUInteger)address; |
| { |
| NSUInteger dataOffset = [_machOFile dataOffsetForAddress:address]; |
| [self setOffset:dataOffset]; |
| } |
| |
| #pragma mark - Read using the current byteOrder |
| |
| - (uint16_t)readInt16; |
| { |
| if (_byteOrder == CDByteOrder_LittleEndian) |
| return [self readLittleInt16]; |
| |
| return [self readBigInt16]; |
| } |
| |
| - (uint32_t)readInt32; |
| { |
| if (_byteOrder == CDByteOrder_LittleEndian) |
| return [self readLittleInt32]; |
| |
| return [self readBigInt32]; |
| } |
| |
| - (uint64_t)readInt64; |
| { |
| if (_byteOrder == CDByteOrder_LittleEndian) |
| return [self readLittleInt64]; |
| |
| return [self readBigInt64]; |
| } |
| |
| - (uint32_t)peekInt32; |
| { |
| NSUInteger savedOffset = self.offset; |
| uint32_t val = [self readInt32]; |
| self.offset = savedOffset; |
| |
| return val; |
| } |
| |
| - (uint64_t)readPtr; |
| { |
| switch (_ptrSize) { |
| case sizeof(uint32_t): return [self readInt32]; |
| case sizeof(uint64_t): return [self readInt64]; |
| } |
| [NSException raise:NSInternalInconsistencyException format:@"The ptrSize must be either 4 (32-bit) or 8 (64-bit)"]; |
| return 0; |
| } |
| |
| @end |