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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
428 lines
17 KiB
C++
428 lines
17 KiB
C++
//===-- DataExtractor.h -----------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_DATAEXTRACTOR_H
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#define LLVM_SUPPORT_DATAEXTRACTOR_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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/// An auxiliary type to facilitate extraction of 3-byte entities.
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struct Uint24 {
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uint8_t Bytes[3];
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Uint24(uint8_t U) {
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Bytes[0] = Bytes[1] = Bytes[2] = U;
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}
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Uint24(uint8_t U0, uint8_t U1, uint8_t U2) {
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Bytes[0] = U0; Bytes[1] = U1; Bytes[2] = U2;
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}
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uint32_t getAsUint32(bool IsLittleEndian) const {
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int LoIx = IsLittleEndian ? 0 : 2;
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return Bytes[LoIx] + (Bytes[1] << 8) + (Bytes[2-LoIx] << 16);
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}
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};
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using uint24_t = Uint24;
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static_assert(sizeof(uint24_t) == 3, "sizeof(uint24_t) != 3");
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/// Needed by swapByteOrder().
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inline uint24_t getSwappedBytes(uint24_t C) {
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return uint24_t(C.Bytes[2], C.Bytes[1], C.Bytes[0]);
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}
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class DataExtractor {
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StringRef Data;
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uint8_t IsLittleEndian;
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uint8_t AddressSize;
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public:
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/// Construct with a buffer that is owned by the caller.
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///
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/// This constructor allows us to use data that is owned by the
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/// caller. The data must stay around as long as this object is
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/// valid.
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DataExtractor(StringRef Data, bool IsLittleEndian, uint8_t AddressSize)
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: Data(Data), IsLittleEndian(IsLittleEndian), AddressSize(AddressSize) {}
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/// Get the data pointed to by this extractor.
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StringRef getData() const { return Data; }
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/// Get the endianness for this extractor.
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bool isLittleEndian() const { return IsLittleEndian; }
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/// Get the address size for this extractor.
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uint8_t getAddressSize() const { return AddressSize; }
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/// Set the address size for this extractor.
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void setAddressSize(uint8_t Size) { AddressSize = Size; }
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/// Extract a C string from \a *offset_ptr.
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///
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/// Returns a pointer to a C String from the data at the offset
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/// pointed to by \a offset_ptr. A variable length NULL terminated C
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/// string will be extracted and the \a offset_ptr will be
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/// updated with the offset of the byte that follows the NULL
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/// terminator byte.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// A pointer to the C string value in the data. If the offset
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/// pointed to by \a offset_ptr is out of bounds, or if the
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/// offset plus the length of the C string is out of bounds,
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/// NULL will be returned.
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const char *getCStr(uint32_t *offset_ptr) const;
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/// Extract a C string from \a *OffsetPtr.
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///
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/// Returns a StringRef for the C String from the data at the offset
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/// pointed to by \a OffsetPtr. A variable length NULL terminated C
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/// string will be extracted and the \a OffsetPtr will be
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/// updated with the offset of the byte that follows the NULL
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/// terminator byte.
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///
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/// \param[in,out] OffsetPtr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// \return
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/// A StringRef for the C string value in the data. If the offset
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/// pointed to by \a OffsetPtr is out of bounds, or if the
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/// offset plus the length of the C string is out of bounds,
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/// a default-initialized StringRef will be returned.
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StringRef getCStrRef(uint32_t *OffsetPtr) const;
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/// Extract an unsigned integer of size \a byte_size from \a
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/// *offset_ptr.
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///
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/// Extract a single unsigned integer value and update the offset
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/// pointed to by \a offset_ptr. The size of the extracted integer
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/// is specified by the \a byte_size argument. \a byte_size should
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/// have a value greater than or equal to one and less than or equal
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/// to eight since the return value is 64 bits wide. Any
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/// \a byte_size values less than 1 or greater than 8 will result in
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/// nothing being extracted, and zero being returned.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @param[in] byte_size
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/// The size in byte of the integer to extract.
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///
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/// @return
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/// The unsigned integer value that was extracted, or zero on
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/// failure.
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uint64_t getUnsigned(uint32_t *offset_ptr, uint32_t byte_size) const;
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/// Extract an signed integer of size \a byte_size from \a *offset_ptr.
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///
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/// Extract a single signed integer value (sign extending if required)
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/// and update the offset pointed to by \a offset_ptr. The size of
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/// the extracted integer is specified by the \a byte_size argument.
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/// \a byte_size should have a value greater than or equal to one
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/// and less than or equal to eight since the return value is 64
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/// bits wide. Any \a byte_size values less than 1 or greater than
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/// 8 will result in nothing being extracted, and zero being returned.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @param[in] size
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/// The size in bytes of the integer to extract.
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///
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/// @return
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/// The sign extended signed integer value that was extracted,
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/// or zero on failure.
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int64_t getSigned(uint32_t *offset_ptr, uint32_t size) const;
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//------------------------------------------------------------------
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/// Extract an pointer from \a *offset_ptr.
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///
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/// Extract a single pointer from the data and update the offset
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/// pointed to by \a offset_ptr. The size of the extracted pointer
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/// is \a getAddressSize(), so the address size has to be
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/// set correctly prior to extracting any pointer values.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted pointer value as a 64 integer.
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uint64_t getAddress(uint32_t *offset_ptr) const {
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return getUnsigned(offset_ptr, AddressSize);
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}
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/// Extract a uint8_t value from \a *offset_ptr.
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///
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/// Extract a single uint8_t from the binary data at the offset
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/// pointed to by \a offset_ptr, and advance the offset on success.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted uint8_t value.
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uint8_t getU8(uint32_t *offset_ptr) const;
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/// Extract \a count uint8_t values from \a *offset_ptr.
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///
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/// Extract \a count uint8_t values from the binary data at the
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/// offset pointed to by \a offset_ptr, and advance the offset on
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/// success. The extracted values are copied into \a dst.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @param[out] dst
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/// A buffer to copy \a count uint8_t values into. \a dst must
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/// be large enough to hold all requested data.
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///
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/// @param[in] count
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/// The number of uint8_t values to extract.
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///
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/// @return
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/// \a dst if all values were properly extracted and copied,
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/// NULL otherise.
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uint8_t *getU8(uint32_t *offset_ptr, uint8_t *dst, uint32_t count) const;
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//------------------------------------------------------------------
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/// Extract a uint16_t value from \a *offset_ptr.
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///
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/// Extract a single uint16_t from the binary data at the offset
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/// pointed to by \a offset_ptr, and update the offset on success.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted uint16_t value.
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//------------------------------------------------------------------
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uint16_t getU16(uint32_t *offset_ptr) const;
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/// Extract \a count uint16_t values from \a *offset_ptr.
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///
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/// Extract \a count uint16_t values from the binary data at the
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/// offset pointed to by \a offset_ptr, and advance the offset on
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/// success. The extracted values are copied into \a dst.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @param[out] dst
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/// A buffer to copy \a count uint16_t values into. \a dst must
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/// be large enough to hold all requested data.
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///
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/// @param[in] count
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/// The number of uint16_t values to extract.
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///
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/// @return
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/// \a dst if all values were properly extracted and copied,
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/// NULL otherise.
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uint16_t *getU16(uint32_t *offset_ptr, uint16_t *dst, uint32_t count) const;
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/// Extract a 24-bit unsigned value from \a *offset_ptr and return it
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/// in a uint32_t.
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///
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/// Extract 3 bytes from the binary data at the offset pointed to by
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/// \a offset_ptr, construct a uint32_t from them and update the offset
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/// on success.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the 3 bytes if the value is extracted correctly. If the offset
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/// is out of bounds or there are not enough bytes to extract this value,
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/// the offset will be left unmodified.
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///
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/// @return
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/// The extracted 24-bit value represented in a uint32_t.
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uint32_t getU24(uint32_t *offset_ptr) const;
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/// Extract a uint32_t value from \a *offset_ptr.
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///
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/// Extract a single uint32_t from the binary data at the offset
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/// pointed to by \a offset_ptr, and update the offset on success.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted uint32_t value.
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uint32_t getU32(uint32_t *offset_ptr) const;
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/// Extract \a count uint32_t values from \a *offset_ptr.
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///
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/// Extract \a count uint32_t values from the binary data at the
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/// offset pointed to by \a offset_ptr, and advance the offset on
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/// success. The extracted values are copied into \a dst.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @param[out] dst
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/// A buffer to copy \a count uint32_t values into. \a dst must
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/// be large enough to hold all requested data.
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///
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/// @param[in] count
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/// The number of uint32_t values to extract.
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///
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/// @return
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/// \a dst if all values were properly extracted and copied,
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/// NULL otherise.
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uint32_t *getU32(uint32_t *offset_ptr, uint32_t *dst, uint32_t count) const;
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/// Extract a uint64_t value from \a *offset_ptr.
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///
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/// Extract a single uint64_t from the binary data at the offset
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/// pointed to by \a offset_ptr, and update the offset on success.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted uint64_t value.
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uint64_t getU64(uint32_t *offset_ptr) const;
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/// Extract \a count uint64_t values from \a *offset_ptr.
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///
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/// Extract \a count uint64_t values from the binary data at the
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/// offset pointed to by \a offset_ptr, and advance the offset on
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/// success. The extracted values are copied into \a dst.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @param[out] dst
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/// A buffer to copy \a count uint64_t values into. \a dst must
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/// be large enough to hold all requested data.
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///
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/// @param[in] count
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/// The number of uint64_t values to extract.
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///
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/// @return
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/// \a dst if all values were properly extracted and copied,
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/// NULL otherise.
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uint64_t *getU64(uint32_t *offset_ptr, uint64_t *dst, uint32_t count) const;
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/// Extract a signed LEB128 value from \a *offset_ptr.
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///
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/// Extracts an signed LEB128 number from this object's data
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/// starting at the offset pointed to by \a offset_ptr. The offset
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/// pointed to by \a offset_ptr will be updated with the offset of
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/// the byte following the last extracted byte.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted signed integer value.
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int64_t getSLEB128(uint32_t *offset_ptr) const;
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/// Extract a unsigned LEB128 value from \a *offset_ptr.
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///
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/// Extracts an unsigned LEB128 number from this object's data
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/// starting at the offset pointed to by \a offset_ptr. The offset
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/// pointed to by \a offset_ptr will be updated with the offset of
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/// the byte following the last extracted byte.
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///
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/// @param[in,out] offset_ptr
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/// A pointer to an offset within the data that will be advanced
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/// by the appropriate number of bytes if the value is extracted
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/// correctly. If the offset is out of bounds or there are not
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/// enough bytes to extract this value, the offset will be left
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/// unmodified.
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///
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/// @return
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/// The extracted unsigned integer value.
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uint64_t getULEB128(uint32_t *offset_ptr) const;
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/// Test the validity of \a offset.
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///
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/// @return
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/// \b true if \a offset is a valid offset into the data in this
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/// object, \b false otherwise.
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bool isValidOffset(uint32_t offset) const { return Data.size() > offset; }
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/// Test the availability of \a length bytes of data from \a offset.
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///
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/// @return
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/// \b true if \a offset is a valid offset and there are \a
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/// length bytes available at that offset, \b false otherwise.
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bool isValidOffsetForDataOfSize(uint32_t offset, uint32_t length) const {
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return offset + length >= offset && isValidOffset(offset + length - 1);
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}
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/// Test the availability of enough bytes of data for a pointer from
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/// \a offset. The size of a pointer is \a getAddressSize().
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///
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/// @return
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/// \b true if \a offset is a valid offset and there are enough
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/// bytes for a pointer available at that offset, \b false
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/// otherwise.
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bool isValidOffsetForAddress(uint32_t offset) const {
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return isValidOffsetForDataOfSize(offset, AddressSize);
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}
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};
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} // namespace llvm
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#endif
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