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https://github.com/reactos/CMake.git
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420 lines
10 KiB
C++
420 lines
10 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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#include "cmStandardIncludes.h" // to get CMAKE_USE_MACH_PARSER first
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#include "cmMachO.h"
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#include <cmsys/FStream.hxx>
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// Include the Mach-O format information system header.
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#include <mach-o/loader.h>
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#include <mach-o/fat.h>
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/**
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https://developer.apple.com/library/mac/documentation/
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DeveloperTools/Conceptual/MachORuntime/index.html
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A Mach-O file has 3 major regions: header, load commands and segments.
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Data Structures are provided from <mach-o/loader.h> which
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correspond to the file structure.
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The header can be either a struct mach_header or struct mach_header_64.
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One can peek at the first 4 bytes to identify the type of header.
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Following is the load command region which starts with
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struct load_command, and is followed by n number of load commands.
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In the case of a universal binary (an archive of multiple Mach-O files),
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the file begins with a struct fat_header and is followed by multiple
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struct fat_arch instances. The struct fat_arch indicates the offset
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for each Mach-O file.
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*/
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namespace {
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// peek in the file
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template <typename T>
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bool peek(cmsys::ifstream& fin, T &v)
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{
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std::streampos p = fin.tellg();
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if(!fin.read(reinterpret_cast<char*>(&v), sizeof(T)))
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{
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return false;
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}
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fin.seekg(p);
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return fin.good();
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}
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// read from the file and fill a data structure
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template <typename T>
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bool read(cmsys::ifstream& fin, T& v)
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{
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if(!fin.read(reinterpret_cast<char*>(&v), sizeof(T)))
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{
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return false;
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}
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return true;
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}
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// read from the file and fill multiple data structures where
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// the vector has been resized
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template <typename T>
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bool read(cmsys::ifstream& fin, std::vector<T>& v)
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{
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// nothing to read
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if(v.empty())
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{
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return true;
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}
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if(!fin.read(reinterpret_cast<char*>(&v[0]), sizeof(T) * v.size()))
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{
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return false;
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}
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return true;
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}
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}
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// Contains header and load commands for a single Mach-O file
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class cmMachOHeaderAndLoadCommands
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{
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public:
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// A load_command and its associated data
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struct RawLoadCommand
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{
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uint32_t type(const cmMachOHeaderAndLoadCommands* m) const
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{
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if(this->LoadCommand.size() < sizeof(load_command))
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{
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return 0;
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}
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const load_command* cmd =
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reinterpret_cast<const load_command*>(&this->LoadCommand[0]);
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return m->swap(cmd->cmd);
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}
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std::vector<char> LoadCommand;
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};
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cmMachOHeaderAndLoadCommands(bool _swap)
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: Swap(_swap)
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{
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}
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virtual ~cmMachOHeaderAndLoadCommands()
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{
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}
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virtual bool read_mach_o(cmsys::ifstream& fin) = 0;
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const std::vector<RawLoadCommand>& load_commands() const
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{
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return this->LoadCommands;
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}
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uint32_t swap(uint32_t v) const
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{
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if(this->Swap)
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{
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char* c = reinterpret_cast<char*>(&v);
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std::swap(c[0], c[3]);
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std::swap(c[1], c[2]);
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}
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return v;
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}
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protected:
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bool read_load_commands(uint32_t ncmds, uint32_t sizeofcmds,
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cmsys::ifstream& fin);
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bool Swap;
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std::vector<RawLoadCommand> LoadCommands;
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};
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// Implementation for reading Mach-O header and load commands.
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// This is 32 or 64 bit arch specific.
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template <class T>
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class cmMachOHeaderAndLoadCommandsImpl : public cmMachOHeaderAndLoadCommands
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{
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public:
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cmMachOHeaderAndLoadCommandsImpl(bool _swap)
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: cmMachOHeaderAndLoadCommands(_swap)
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{
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}
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bool read_mach_o(cmsys::ifstream& fin)
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{
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if(!read(fin, this->Header))
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{
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return false;
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}
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this->Header.cputype = swap(this->Header.cputype);
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this->Header.cpusubtype = swap(this->Header.cpusubtype);
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this->Header.filetype = swap(this->Header.filetype);
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this->Header.ncmds = swap(this->Header.ncmds);
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this->Header.sizeofcmds = swap(this->Header.sizeofcmds);
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this->Header.flags = swap(this->Header.flags);
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return read_load_commands(this->Header.ncmds,
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this->Header.sizeofcmds,
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fin);
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}
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protected:
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T Header;
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};
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bool cmMachOHeaderAndLoadCommands::read_load_commands(uint32_t ncmds,
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uint32_t sizeofcmds,
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cmsys::ifstream& fin)
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{
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uint32_t size_read = 0;
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this->LoadCommands.resize(ncmds);
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for(uint32_t i = 0; i<ncmds; i++)
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{
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load_command lc;
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if(!peek(fin, lc))
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{
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return false;
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}
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lc.cmd = swap(lc.cmd);
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lc.cmdsize = swap(lc.cmdsize);
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size_read += lc.cmdsize;
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RawLoadCommand& c = this->LoadCommands[i];
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c.LoadCommand.resize(lc.cmdsize);
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if(!read(fin, c.LoadCommand))
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{
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return false;
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}
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}
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if(size_read != sizeofcmds)
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{
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this->LoadCommands.clear();
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return false;
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}
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return true;
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}
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//----------------------------------------------------------------------------
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class cmMachOInternal
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{
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public:
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cmMachOInternal(const char* fname);
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~cmMachOInternal();
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// read a Mach-O file
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bool read_mach_o(uint32_t file_offset);
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// the file we are reading
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cmsys::ifstream Fin;
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// The archs in the universal binary
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// If the binary is not a universal binary, this will be empty.
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std::vector<fat_arch> FatArchs;
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// the error message while parsing
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std::string ErrorMessage;
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// the list of Mach-O's
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std::vector<cmMachOHeaderAndLoadCommands*> MachOList;
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};
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cmMachOInternal::cmMachOInternal(const char* fname)
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: Fin(fname)
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{
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// Quit now if the file could not be opened.
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if(!this->Fin || !this->Fin.get() )
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{
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this->ErrorMessage = "Error opening input file.";
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return;
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}
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if(!this->Fin.seekg(0))
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{
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this->ErrorMessage = "Error seeking to beginning of file.";
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return;
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}
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// Read the binary identification block.
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uint32_t magic = 0;
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if(!peek(this->Fin, magic))
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{
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this->ErrorMessage = "Error reading Mach-O identification.";
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return;
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}
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// Verify the binary identification.
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if(!(magic == MH_CIGAM ||
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magic == MH_MAGIC ||
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magic == MH_CIGAM_64 ||
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magic == MH_MAGIC_64 ||
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magic == FAT_CIGAM ||
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magic == FAT_MAGIC))
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{
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this->ErrorMessage = "File does not have a valid Mach-O identification.";
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return;
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}
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if(magic == FAT_MAGIC || magic == FAT_CIGAM)
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{
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// this is a universal binary
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fat_header header;
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if(!read(this->Fin, header))
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{
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this->ErrorMessage = "Error reading fat header.";
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return;
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}
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// read fat_archs
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this->FatArchs.resize(OSSwapBigToHostInt32(header.nfat_arch));
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if(!read(this->Fin, this->FatArchs))
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{
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this->ErrorMessage = "Error reading fat header archs.";
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return;
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}
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// parse each Mach-O file
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for(size_t i=0; i<this->FatArchs.size(); i++)
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{
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const fat_arch& arch = this->FatArchs[i];
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if(!this->read_mach_o(OSSwapBigToHostInt32(arch.offset)))
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{
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return;
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}
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}
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}
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else
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{
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// parse Mach-O file at the beginning of the file
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this->read_mach_o(0);
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}
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}
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cmMachOInternal::~cmMachOInternal()
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{
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for(size_t i=0; i<this->MachOList.size(); i++)
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{
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delete this->MachOList[i];
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}
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}
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bool cmMachOInternal::read_mach_o(uint32_t file_offset)
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{
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if(!this->Fin.seekg(file_offset))
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{
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this->ErrorMessage = "Failed to locate Mach-O content.";
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return false;
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}
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uint32_t magic;
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if(!peek(this->Fin, magic))
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{
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this->ErrorMessage = "Error reading Mach-O identification.";
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return false;
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}
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cmMachOHeaderAndLoadCommands* f = NULL;
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if(magic == MH_CIGAM || magic == MH_MAGIC)
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{
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bool swap = false;
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if(magic == MH_CIGAM)
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{
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swap = true;
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}
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f = new cmMachOHeaderAndLoadCommandsImpl<mach_header>(swap);
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}
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else if(magic == MH_CIGAM_64 || magic == MH_MAGIC_64)
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{
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bool swap = false;
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if(magic == MH_CIGAM_64)
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{
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swap = true;
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}
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f = new cmMachOHeaderAndLoadCommandsImpl<mach_header_64>(swap);
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}
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if(f && f->read_mach_o(this->Fin))
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{
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this->MachOList.push_back(f);
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}
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else
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{
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delete f;
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this->ErrorMessage = "Failed to read Mach-O header.";
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return false;
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}
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return true;
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}
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//============================================================================
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// External class implementation.
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//----------------------------------------------------------------------------
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cmMachO::cmMachO(const char* fname): Internal(0)
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{
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this->Internal = new cmMachOInternal(fname);
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}
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//----------------------------------------------------------------------------
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cmMachO::~cmMachO()
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{
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delete this->Internal;
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}
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std::string const& cmMachO::GetErrorMessage() const
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{
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return this->Internal->ErrorMessage;
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}
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//----------------------------------------------------------------------------
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bool cmMachO::Valid() const
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{
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return !this->Internal->MachOList.empty();
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}
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bool cmMachO::GetInstallName(std::string& install_name)
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{
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if(this->Internal->MachOList.empty())
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{
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return false;
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}
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// grab the first Mach-O and get the install name from that one
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cmMachOHeaderAndLoadCommands* macho = this->Internal->MachOList[0];
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for(size_t i=0; i<macho->load_commands().size(); i++)
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{
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const cmMachOHeaderAndLoadCommands::RawLoadCommand &cmd =
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macho->load_commands()[i];
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uint32_t lc_cmd = cmd.type(macho);
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if(lc_cmd == LC_ID_DYLIB ||
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lc_cmd == LC_LOAD_WEAK_DYLIB ||
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lc_cmd == LC_LOAD_DYLIB)
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{
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if(sizeof(dylib_command) < cmd.LoadCommand.size())
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{
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uint32_t namelen = cmd.LoadCommand.size() - sizeof(dylib_command);
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install_name.assign(&cmd.LoadCommand[sizeof(dylib_command)], namelen);
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return true;
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}
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}
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}
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return false;
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}
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void cmMachO::PrintInfo(std::ostream& /*os*/) const
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{
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}
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