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//===-- DataEncoder.cpp ---------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Utility/DataEncoder.h"
#include "lldb/Utility/DataBufferHeap.h"
#include "lldb/Utility/Endian.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/ErrorHandling.h"
#include <cstddef>
#include <cstring>
using namespace lldb;
using namespace lldb_private;
using namespace llvm::support::endian;
DataEncoder::DataEncoder()
: m_data_sp(new DataBufferHeap()), m_byte_order(endian::InlHostByteOrder()),
m_addr_size(sizeof(void *)) {}
DataEncoder::DataEncoder(const void *data, uint32_t length, ByteOrder endian,
uint8_t addr_size)
: m_data_sp(new DataBufferHeap(data, length)), m_byte_order(endian),
m_addr_size(addr_size) {}
DataEncoder::DataEncoder(ByteOrder endian, uint8_t addr_size)
: m_data_sp(new DataBufferHeap()), m_byte_order(endian),
m_addr_size(addr_size) {}
DataEncoder::~DataEncoder() = default;
llvm::ArrayRef<uint8_t> DataEncoder::GetData() const {
return llvm::ArrayRef<uint8_t>(m_data_sp->GetBytes(), GetByteSize());
}
size_t DataEncoder::GetByteSize() const { return m_data_sp->GetByteSize(); }
// Extract a single unsigned char from the binary data and update the offset
// pointed to by "offset_ptr".
//
// RETURNS the byte that was extracted, or zero on failure.
uint32_t DataEncoder::PutU8(uint32_t offset, uint8_t value) {
if (ValidOffset(offset)) {
m_data_sp->GetBytes()[offset] = value;
return offset + 1;
}
return UINT32_MAX;
}
uint32_t DataEncoder::PutU16(uint32_t offset, uint16_t value) {
if (ValidOffsetForDataOfSize(offset, sizeof(value))) {
if (m_byte_order != endian::InlHostByteOrder())
write16be(m_data_sp->GetBytes() + offset, value);
else
write16le(m_data_sp->GetBytes() + offset, value);
return offset + sizeof(value);
}
return UINT32_MAX;
}
uint32_t DataEncoder::PutU32(uint32_t offset, uint32_t value) {
if (ValidOffsetForDataOfSize(offset, sizeof(value))) {
if (m_byte_order != endian::InlHostByteOrder())
write32be(m_data_sp->GetBytes() + offset, value);
else
write32le(m_data_sp->GetBytes() + offset, value);
return offset + sizeof(value);
}
return UINT32_MAX;
}
uint32_t DataEncoder::PutU64(uint32_t offset, uint64_t value) {
if (ValidOffsetForDataOfSize(offset, sizeof(value))) {
if (m_byte_order != endian::InlHostByteOrder())
write64be(m_data_sp->GetBytes() + offset, value);
else
write64le(m_data_sp->GetBytes() + offset, value);
return offset + sizeof(value);
}
return UINT32_MAX;
}
uint32_t DataEncoder::PutUnsigned(uint32_t offset, uint32_t byte_size,
uint64_t value) {
switch (byte_size) {
case 1:
return PutU8(offset, value);
case 2:
return PutU16(offset, value);
case 4:
return PutU32(offset, value);
case 8:
return PutU64(offset, value);
default:
llvm_unreachable("GetMax64 unhandled case!");
}
return UINT32_MAX;
}
uint32_t DataEncoder::PutData(uint32_t offset, const void *src,
uint32_t src_len) {
if (src == nullptr || src_len == 0)
return offset;
if (ValidOffsetForDataOfSize(offset, src_len)) {
memcpy(m_data_sp->GetBytes() + offset, src, src_len);
return offset + src_len;
}
return UINT32_MAX;
}
uint32_t DataEncoder::PutAddress(uint32_t offset, lldb::addr_t addr) {
return PutUnsigned(offset, m_addr_size, addr);
}
uint32_t DataEncoder::PutCString(uint32_t offset, const char *cstr) {
if (cstr != nullptr)
return PutData(offset, cstr, strlen(cstr) + 1);
return UINT32_MAX;
}
void DataEncoder::AppendU8(uint8_t value) {
m_data_sp->AppendData(&value, sizeof(value));
}
void DataEncoder::AppendU16(uint16_t value) {
uint32_t offset = m_data_sp->GetByteSize();
m_data_sp->SetByteSize(m_data_sp->GetByteSize() + sizeof(value));
PutU16(offset, value);
}
void DataEncoder::AppendU32(uint32_t value) {
uint32_t offset = m_data_sp->GetByteSize();
m_data_sp->SetByteSize(m_data_sp->GetByteSize() + sizeof(value));
PutU32(offset, value);
}
void DataEncoder::AppendU64(uint64_t value) {
uint32_t offset = m_data_sp->GetByteSize();
m_data_sp->SetByteSize(m_data_sp->GetByteSize() + sizeof(value));
PutU64(offset, value);
}
void DataEncoder::AppendAddress(lldb::addr_t addr) {
switch (m_addr_size) {
case 4:
AppendU32(addr);
break;
case 8:
AppendU64(addr);
break;
default:
llvm_unreachable("AppendAddress unhandled case!");
}
}
void DataEncoder::AppendData(llvm::StringRef data) {
const char *bytes = data.data();
const size_t length = data.size();
if (bytes && length > 0)
m_data_sp->AppendData(bytes, length);
}
void DataEncoder::AppendData(llvm::ArrayRef<uint8_t> data) {
const uint8_t *bytes = data.data();
const size_t length = data.size();
if (bytes && length > 0)
m_data_sp->AppendData(bytes, length);
}
void DataEncoder::AppendCString(llvm::StringRef data) {
const char *bytes = data.data();
const size_t length = data.size();
if (bytes) {
if (length > 0)
m_data_sp->AppendData(bytes, length);
if (length == 0 || bytes[length - 1] != '\0')
AppendU8(0);
}
}
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