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429 lines
17 KiB
C++
429 lines
17 KiB
C++
//===-- DataExtractor.h -----------------------------------------*- 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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#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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