1 //===-- DNBDataRef.h --------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // Created by Greg Clayton on 1/11/06. 11 // 12 //===----------------------------------------------------------------------===// 13 // 14 // DNBDataRef is a class that can extract data in normal or byte 15 // swapped order from a data buffer that someone else owns. The data 16 // buffer needs to remain intact as long as the DNBDataRef object 17 // needs the data. Strings returned are pointers into the data buffer 18 // and will need to be copied if they are needed after the data buffer 19 // is no longer around. 20 // 21 //===----------------------------------------------------------------------===// 22 23 #ifndef __DNBDataRef_h__ 24 #define __DNBDataRef_h__ 25 26 #include "DNBDefs.h" 27 #include <stdint.h> 28 #include <stdio.h> 29 #include <string.h> 30 #include <limits.h> 31 32 class DNBDataRef 33 { 34 public: 35 // For use with Dump 36 typedef enum 37 { 38 TypeUInt8 = 0, 39 TypeChar, 40 TypeUInt16, 41 TypeUInt32, 42 TypeUInt64, 43 TypePointer, 44 TypeULEB128, 45 TypeSLEB128 46 } Type; 47 typedef uint32_t offset_t; 48 typedef nub_addr_t addr_t; 49 50 DNBDataRef(); 51 DNBDataRef(const uint8_t *start, size_t size, bool swap); 52 ~DNBDataRef(); 53 void Clear() 54 { 55 DNBDataRef::SetData(NULL, 0); 56 m_swap = false; 57 } 58 59 offset_t BytesLeft (offset_t offset) const 60 { 61 const offset_t size = GetSize(); 62 if (size > offset) 63 return size - offset; 64 return 0; 65 } 66 67 bool ValidOffset(offset_t offset) const 68 { 69 return BytesLeft(offset) > 0; 70 } 71 bool ValidOffsetForDataOfSize(offset_t offset, uint32_t num_bytes) const 72 { 73 return num_bytes <= BytesLeft (offset); 74 } 75 size_t GetSize() const { return m_end - m_start; } 76 const uint8_t * GetDataStart() const { return m_start; } 77 const uint8_t * GetDataEnd() const { return m_end; } 78 bool GetSwap() const { return m_swap; } 79 void SetSwap(bool swap) { m_swap = swap; } 80 void SetData(const uint8_t *start, size_t size) 81 { 82 m_start = start; 83 if (m_start != NULL) 84 m_end = start + size; 85 else 86 m_end = NULL; 87 } 88 uint8_t GetPointerSize() const { return m_ptrSize; } 89 void SetPointerSize(uint8_t size) { m_ptrSize = size; } 90 void SetEHPtrBaseAddrPCRelative(addr_t addr = INVALID_NUB_ADDRESS) { m_addrPCRelative = addr; } 91 void SetEHPtrBaseAddrTEXT(addr_t addr = INVALID_NUB_ADDRESS) { m_addrTEXT = addr; } 92 void SetEHPtrBaseAddrDATA(addr_t addr = INVALID_NUB_ADDRESS) { m_addrDATA = addr; } 93 uint8_t Get8(offset_t *offset_ptr) const; 94 uint16_t Get16(offset_t *offset_ptr) const; 95 uint32_t Get32(offset_t *offset_ptr) const; 96 uint64_t Get64(offset_t *offset_ptr) const; 97 uint32_t GetMax32(offset_t *offset_ptr, uint32_t byte_size) const; 98 uint64_t GetMax64(offset_t *offset_ptr, uint32_t byte_size) const; 99 uint64_t GetPointer(offset_t *offset_ptr) const; 100 // uint64_t GetDwarfEHPtr(offset_t *offset_ptr, uint32_t eh_ptr_enc) const; 101 const char * GetCStr(offset_t *offset_ptr, uint32_t fixed_length = 0) const; 102 const char * PeekCStr(offset_t offset) const 103 { 104 if (ValidOffset(offset)) 105 return (const char*)m_start + offset; 106 return NULL; 107 } 108 109 const uint8_t * GetData( offset_t *offset_ptr, uint32_t length) const; 110 uint64_t Get_ULEB128 (offset_t *offset_ptr) const; 111 int64_t Get_SLEB128 (offset_t *offset_ptr) const; 112 void Skip_LEB128 (offset_t *offset_ptr) const; 113 114 uint32_t Dump(offset_t startOffset, offset_t endOffset, uint64_t offsetBase, DNBDataRef::Type type, uint32_t numPerLine, const char *typeFormat = NULL); 115 protected: 116 const uint8_t * m_start; 117 const uint8_t * m_end; 118 bool m_swap; 119 uint8_t m_ptrSize; 120 addr_t m_addrPCRelative; 121 addr_t m_addrTEXT; 122 addr_t m_addrDATA; 123 }; 124 125 #endif // #ifndef __DNBDataRef_h__ 126
