352 lines
11 KiB
C++
352 lines
11 KiB
C++
//===-- DNBDataRef.cpp ------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Created by Greg Clayton on 1/11/06.
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//
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//===----------------------------------------------------------------------===//
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#include "DNBDataRef.h"
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#include "DNBLog.h"
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#include <assert.h>
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#include <ctype.h>
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#include <libkern/OSByteOrder.h>
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//----------------------------------------------------------------------
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// Constructor
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//----------------------------------------------------------------------
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DNBDataRef::DNBDataRef()
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: m_start(NULL), m_end(NULL), m_swap(false), m_ptrSize(0),
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m_addrPCRelative(INVALID_NUB_ADDRESS), m_addrTEXT(INVALID_NUB_ADDRESS),
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m_addrDATA(INVALID_NUB_ADDRESS) {}
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//----------------------------------------------------------------------
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// Constructor
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//----------------------------------------------------------------------
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DNBDataRef::DNBDataRef(const uint8_t *start, size_t size, bool swap)
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: m_start(start), m_end(start + size), m_swap(swap), m_ptrSize(0),
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m_addrPCRelative(INVALID_NUB_ADDRESS), m_addrTEXT(INVALID_NUB_ADDRESS),
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m_addrDATA(INVALID_NUB_ADDRESS) {}
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//----------------------------------------------------------------------
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// Destructor
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//----------------------------------------------------------------------
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DNBDataRef::~DNBDataRef() {}
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//----------------------------------------------------------------------
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// Get8
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//----------------------------------------------------------------------
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uint8_t DNBDataRef::Get8(offset_t *offset_ptr) const {
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uint8_t val = 0;
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if (ValidOffsetForDataOfSize(*offset_ptr, sizeof(val))) {
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val = *(m_start + *offset_ptr);
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*offset_ptr += sizeof(val);
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}
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return val;
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}
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//----------------------------------------------------------------------
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// Get16
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//----------------------------------------------------------------------
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uint16_t DNBDataRef::Get16(offset_t *offset_ptr) const {
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uint16_t val = 0;
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if (ValidOffsetForDataOfSize(*offset_ptr, sizeof(val))) {
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const uint8_t *p = m_start + *offset_ptr;
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memcpy(&val, p, sizeof(uint16_t));
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if (m_swap)
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val = OSSwapInt16(val);
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// Advance the offset
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*offset_ptr += sizeof(val);
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}
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return val;
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}
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//----------------------------------------------------------------------
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// Get32
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//----------------------------------------------------------------------
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uint32_t DNBDataRef::Get32(offset_t *offset_ptr) const {
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uint32_t val = 0;
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if (ValidOffsetForDataOfSize(*offset_ptr, sizeof(val))) {
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const uint8_t *p = m_start + *offset_ptr;
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memcpy(&val, p, sizeof(uint32_t));
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if (m_swap)
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val = OSSwapInt32(val);
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// Advance the offset
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*offset_ptr += sizeof(val);
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}
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return val;
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}
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//----------------------------------------------------------------------
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// Get64
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//----------------------------------------------------------------------
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uint64_t DNBDataRef::Get64(offset_t *offset_ptr) const {
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uint64_t val = 0;
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if (ValidOffsetForDataOfSize(*offset_ptr, sizeof(val))) {
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const uint8_t *p = m_start + *offset_ptr;
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memcpy(&val, p, sizeof(uint64_t));
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if (m_swap)
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val = OSSwapInt64(val);
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// Advance the offset
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*offset_ptr += sizeof(val);
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}
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return val;
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}
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//----------------------------------------------------------------------
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// GetMax32
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//
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// Used for calls when the size can vary. Fill in extra cases if they
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// are ever needed.
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//----------------------------------------------------------------------
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uint32_t DNBDataRef::GetMax32(offset_t *offset_ptr, uint32_t byte_size) const {
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switch (byte_size) {
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case 1:
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return Get8(offset_ptr);
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break;
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case 2:
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return Get16(offset_ptr);
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break;
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case 4:
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return Get32(offset_ptr);
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break;
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default:
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assert(false && "GetMax32 unhandled case!");
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break;
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}
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return 0;
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}
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//----------------------------------------------------------------------
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// GetMax64
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//
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// Used for calls when the size can vary. Fill in extra cases if they
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// are ever needed.
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//----------------------------------------------------------------------
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uint64_t DNBDataRef::GetMax64(offset_t *offset_ptr, uint32_t size) const {
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switch (size) {
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case 1:
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return Get8(offset_ptr);
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break;
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case 2:
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return Get16(offset_ptr);
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break;
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case 4:
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return Get32(offset_ptr);
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break;
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case 8:
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return Get64(offset_ptr);
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break;
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default:
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assert(false && "GetMax64 unhandled case!");
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break;
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}
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return 0;
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}
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//----------------------------------------------------------------------
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// GetPointer
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//
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// Extract a pointer value from the buffer. The pointer size must be
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// set prior to using this using one of the SetPointerSize functions.
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//----------------------------------------------------------------------
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uint64_t DNBDataRef::GetPointer(offset_t *offset_ptr) const {
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// Must set pointer size prior to using this call
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assert(m_ptrSize != 0);
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return GetMax64(offset_ptr, m_ptrSize);
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}
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//----------------------------------------------------------------------
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// GetCStr
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//----------------------------------------------------------------------
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const char *DNBDataRef::GetCStr(offset_t *offset_ptr,
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uint32_t fixed_length) const {
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const char *s = NULL;
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if (m_start < m_end) {
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s = (const char *)m_start + *offset_ptr;
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// Advance the offset
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if (fixed_length)
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*offset_ptr += fixed_length;
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else
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*offset_ptr += strlen(s) + 1;
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}
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return s;
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}
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//----------------------------------------------------------------------
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// GetData
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//----------------------------------------------------------------------
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const uint8_t *DNBDataRef::GetData(offset_t *offset_ptr,
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uint32_t length) const {
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const uint8_t *data = NULL;
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if (length > 0 && ValidOffsetForDataOfSize(*offset_ptr, length)) {
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data = m_start + *offset_ptr;
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*offset_ptr += length;
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}
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return data;
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}
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//----------------------------------------------------------------------
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// Get_ULEB128
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//----------------------------------------------------------------------
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uint64_t DNBDataRef::Get_ULEB128(offset_t *offset_ptr) const {
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uint64_t result = 0;
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if (m_start < m_end) {
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int shift = 0;
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const uint8_t *src = m_start + *offset_ptr;
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uint8_t byte;
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int bytecount = 0;
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while (src < m_end) {
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bytecount++;
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byte = *src++;
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result |= (uint64_t)(byte & 0x7f) << shift;
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shift += 7;
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if ((byte & 0x80) == 0)
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break;
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}
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*offset_ptr += bytecount;
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}
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return result;
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}
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//----------------------------------------------------------------------
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// Get_SLEB128
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//----------------------------------------------------------------------
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int64_t DNBDataRef::Get_SLEB128(offset_t *offset_ptr) const {
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int64_t result = 0;
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if (m_start < m_end) {
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int shift = 0;
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int size = sizeof(uint32_t) * 8;
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const uint8_t *src = m_start + *offset_ptr;
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uint8_t byte = 0;
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int bytecount = 0;
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while (src < m_end) {
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bytecount++;
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byte = *src++;
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result |= (int64_t)(byte & 0x7f) << shift;
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shift += 7;
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if ((byte & 0x80) == 0)
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break;
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}
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// Sign bit of byte is 2nd high order bit (0x40)
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if (shift < size && (byte & 0x40))
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result |= -(1ll << shift);
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*offset_ptr += bytecount;
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}
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return result;
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}
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//----------------------------------------------------------------------
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// Skip_LEB128
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//
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// Skips past ULEB128 and SLEB128 numbers (just updates the offset)
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//----------------------------------------------------------------------
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void DNBDataRef::Skip_LEB128(offset_t *offset_ptr) const {
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if (m_start < m_end) {
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const uint8_t *start = m_start + *offset_ptr;
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const uint8_t *src = start;
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while ((src < m_end) && (*src++ & 0x80))
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/* Do nothing */;
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*offset_ptr += src - start;
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}
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}
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uint32_t DNBDataRef::Dump(uint32_t startOffset, uint32_t endOffset,
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uint64_t offsetBase, DNBDataRef::Type type,
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uint32_t numPerLine, const char *format) {
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uint32_t offset;
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uint32_t count;
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char str[1024];
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str[0] = '\0';
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size_t str_offset = 0;
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for (offset = startOffset, count = 0;
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ValidOffset(offset) && offset < endOffset; ++count) {
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if ((count % numPerLine) == 0) {
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// Print out any previous string
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if (str[0] != '\0')
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DNBLog("%s", str);
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// Reset string offset and fill the current line string with address:
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str_offset = 0;
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str_offset += snprintf(str, sizeof(str), "0x%8.8llx:",
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(uint64_t)(offsetBase + (offset - startOffset)));
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}
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// Make sure we don't pass the bounds of our current string buffer on each
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// iteration through this loop
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if (str_offset >= sizeof(str)) {
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// The last snprintf consumed our string buffer, we will need to dump this
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// out
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// and reset the string with no address
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DNBLog("%s", str);
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str_offset = 0;
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str[0] = '\0';
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}
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// We already checked that there is at least some room in the string str
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// above, so it is safe to make
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// the snprintf call each time through this loop
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switch (type) {
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case TypeUInt8:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " %2.2x", Get8(&offset));
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break;
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case TypeChar: {
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char ch = Get8(&offset);
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " %c", isprint(ch) ? ch : ' ');
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} break;
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case TypeUInt16:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " %4.4x", Get16(&offset));
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break;
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case TypeUInt32:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " %8.8x", Get32(&offset));
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break;
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case TypeUInt64:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " %16.16llx", Get64(&offset));
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break;
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case TypePointer:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " 0x%llx", GetPointer(&offset));
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break;
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case TypeULEB128:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " 0x%llx", Get_ULEB128(&offset));
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break;
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case TypeSLEB128:
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str_offset += snprintf(str + str_offset, sizeof(str) - str_offset,
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format ? format : " %lld", Get_SLEB128(&offset));
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break;
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}
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}
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if (str[0] != '\0')
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DNBLog("%s", str);
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return offset; // Return the offset at which we ended up
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}
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