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83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
//===- MSFCommon.cpp - Common types and functions for MSF files -----------===//
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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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#include "llvm/DebugInfo/MSF/MSFCommon.h"
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#include "llvm/DebugInfo/MSF/MSFError.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include <cstdint>
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#include <cstring>
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using namespace llvm;
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using namespace llvm::msf;
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Error llvm::msf::validateSuperBlock(const SuperBlock &SB) {
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// Check the magic bytes.
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if (std::memcmp(SB.MagicBytes, Magic, sizeof(Magic)) != 0)
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return make_error<MSFError>(msf_error_code::invalid_format,
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"MSF magic header doesn't match");
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if (!isValidBlockSize(SB.BlockSize))
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return make_error<MSFError>(msf_error_code::invalid_format,
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"Unsupported block size.");
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// We don't support directories whose sizes aren't a multiple of four bytes.
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if (SB.NumDirectoryBytes % sizeof(support::ulittle32_t) != 0)
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return make_error<MSFError>(msf_error_code::invalid_format,
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"Directory size is not multiple of 4.");
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// The number of blocks which comprise the directory is a simple function of
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// the number of bytes it contains.
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uint64_t NumDirectoryBlocks =
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bytesToBlocks(SB.NumDirectoryBytes, SB.BlockSize);
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// The directory, as we understand it, is a block which consists of a list of
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// block numbers. It is unclear what would happen if the number of blocks
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// couldn't fit on a single block.
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if (NumDirectoryBlocks > SB.BlockSize / sizeof(support::ulittle32_t))
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return make_error<MSFError>(msf_error_code::invalid_format,
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"Too many directory blocks.");
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if (SB.BlockMapAddr == 0)
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return make_error<MSFError>(msf_error_code::invalid_format,
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"Block 0 is reserved");
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if (SB.BlockMapAddr >= SB.NumBlocks)
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return make_error<MSFError>(msf_error_code::invalid_format,
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"Block map address is invalid.");
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if (SB.FreeBlockMapBlock != 1 && SB.FreeBlockMapBlock != 2)
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return make_error<MSFError>(
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msf_error_code::invalid_format,
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"The free block map isn't at block 1 or block 2.");
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return Error::success();
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}
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MSFStreamLayout llvm::msf::getFpmStreamLayout(const MSFLayout &Msf,
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bool IncludeUnusedFpmData,
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bool AltFpm) {
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MSFStreamLayout FL;
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uint32_t NumFpmIntervals =
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getNumFpmIntervals(Msf, IncludeUnusedFpmData, AltFpm);
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uint32_t FpmBlock = AltFpm ? Msf.alternateFpmBlock() : Msf.mainFpmBlock();
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for (uint32_t I = 0; I < NumFpmIntervals; ++I) {
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FL.Blocks.push_back(support::ulittle32_t(FpmBlock));
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FpmBlock += msf::getFpmIntervalLength(Msf);
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}
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if (IncludeUnusedFpmData)
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FL.Length = NumFpmIntervals * Msf.SB->BlockSize;
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else
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FL.Length = divideCeil(Msf.SB->NumBlocks, 8);
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return FL;
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}
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