Sweden-Number/dlls/dbghelp/minidump.c

/*
 * File minidump.c - management of dumps (read & write)
 *
 * Copyright (C) 2004-2005, Eric Pouech
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <time.h>

#define NONAMELESSUNION
#define NONAMELESSSTRUCT

#include "dbghelp_private.h"
#include "ntstatus.h"
#include "winnls.h"
#include "winreg.h"
#include "winternl.h"
#include "psapi.h"
#include "wine/debug.h"

WINE_DEFAULT_DEBUG_CHANNEL(dbghelp);

struct dump_memory
{
    ULONG                               base;
    ULONG                               size;
    ULONG                               rva;
};

struct dump_module
{
    unsigned                            is_elf;
    ULONG                               base;
    ULONG                               size;
    DWORD                               timestamp;
    DWORD                               checksum;
    char                                name[MAX_PATH];
};

struct dump_context
{
    /* process & thread information */
    HANDLE                              hProcess;
    DWORD                               pid;
    void*                               pcs_buffer;
    SYSTEM_PROCESS_INFORMATION*         spi;
    /* module information */
    struct dump_module*                 module;
    unsigned                            num_module;
    /* exception information */
    /* output information */
    MINIDUMP_TYPE                       type;
    HANDLE                              hFile;
    RVA                                 rva;
    struct dump_memory*                 mem;
    unsigned                            num_mem;
    /* callback information */
    MINIDUMP_CALLBACK_INFORMATION*      cb;
};

/******************************************************************
 *		fetch_process_info
 *
 * reads system wide process information, and make spi point to the record
 * for process of id 'pid'
 */
static BOOL fetch_process_info(struct dump_context* dc)
{
    ULONG       buf_size = 0x1000;
    NTSTATUS    nts;

    dc->pcs_buffer = NULL;
    if (!(dc->pcs_buffer = HeapAlloc(GetProcessHeap(), 0, buf_size))) return FALSE;
    for (;;)
    {
        nts = NtQuerySystemInformation(SystemProcessInformation, 
                                       dc->pcs_buffer, buf_size, NULL);
        if (nts != STATUS_INFO_LENGTH_MISMATCH) break;
        dc->pcs_buffer = HeapReAlloc(GetProcessHeap(), 0, dc->pcs_buffer, 
                                     buf_size *= 2);
        if (!dc->pcs_buffer) return FALSE;
    }

    if (nts == STATUS_SUCCESS)
    {
        dc->spi = dc->pcs_buffer;
        for (;;)
        {
            if (dc->spi->dwProcessID == dc->pid) return TRUE;
            if (!dc->spi->dwOffset) break;
            dc->spi = (SYSTEM_PROCESS_INFORMATION*)     
                ((char*)dc->spi + dc->spi->dwOffset);
        }
    }
    HeapFree(GetProcessHeap(), 0, dc->pcs_buffer);
    dc->pcs_buffer = NULL;
    dc->spi = NULL;
    return FALSE;
}

/******************************************************************
 *		fetch_thread_info
 *
 * fetches some information about thread of id 'tid'
 */
static BOOL fetch_thread_info(struct dump_context* dc, int thd_idx,
                              MINIDUMP_THREAD* mdThd, CONTEXT* ctx)
{
    NT_TIB                      tib;
    DWORD                       tid = dc->spi->ti[thd_idx].dwThreadID;
    HANDLE                      hThread;
    THREAD_BASIC_INFORMATION    tbi;

    memset(ctx, 0, sizeof(*ctx));

    mdThd->ThreadId = dc->spi->ti[thd_idx].dwThreadID;
    mdThd->SuspendCount = 0;
    mdThd->Teb = 0;
    mdThd->Stack.StartOfMemoryRange = 0;
    mdThd->Stack.Memory.DataSize = 0;
    mdThd->Stack.Memory.Rva = 0;
    mdThd->ThreadContext.DataSize = 0;
    mdThd->ThreadContext.Rva = 0;
    mdThd->PriorityClass = dc->spi->ti[thd_idx].dwBasePriority; /* FIXME */
    mdThd->Priority = dc->spi->ti[thd_idx].dwCurrentPriority;

    if ((hThread = OpenThread(THREAD_ALL_ACCESS, FALSE, tid)) == NULL)
    {
        FIXME("Couldn't open thread %lu (%lu)\n", 
              dc->spi->ti[thd_idx].dwThreadID, GetLastError());
        return FALSE;
    }
    
    if (NtQueryInformationThread(hThread, ThreadBasicInformation,
                                 &tbi, sizeof(tbi), NULL) == STATUS_SUCCESS)
    {
        mdThd->Teb = (ULONG_PTR)tbi.TebBaseAddress;
        if (tbi.ExitStatus == STILL_ACTIVE && tid != GetCurrentThreadId() &&
            (mdThd->SuspendCount = SuspendThread(hThread)) != (DWORD)-1)
        {
            mdThd->SuspendCount--;
            ctx->ContextFlags = CONTEXT_FULL;
            if (!GetThreadContext(hThread, ctx))
                memset(ctx, 0, sizeof(*ctx));

            if (ReadProcessMemory(dc->hProcess, tbi.TebBaseAddress, 
                                  &tib, sizeof(tib), NULL))
            {
#ifdef __i386__
                /* limiting the stack dumping to the size actually used */
                if (ctx->Esp)
                    mdThd->Stack.StartOfMemoryRange = (ctx->Esp - 4);
                else
                    mdThd->Stack.StartOfMemoryRange = (ULONG_PTR)tib.StackLimit;
                mdThd->Stack.Memory.DataSize = (ULONG_PTR)tib.StackBase - 
                    mdThd->Stack.StartOfMemoryRange;
#else
#error unsupported CPU                            
#endif
            }
            ResumeThread(hThread);
        }
    }
    CloseHandle(hThread);
    return TRUE;
}

/******************************************************************
 *		add_module
 *
 * Add a module to a dump context
 */
static BOOL add_module(struct dump_context* dc, const char* name,
                       DWORD base, DWORD size, DWORD timestamp, DWORD checksum,
                       BOOL is_elf)
{
    if (!dc->module)
        dc->module = HeapAlloc(GetProcessHeap(), 0,
                               ++dc->num_module * sizeof(*dc->module));
    else
        dc->module = HeapReAlloc(GetProcessHeap(), 0, dc->module,
                                 ++dc->num_module * sizeof(*dc->module));
    if (!dc->module) return FALSE;
    if (is_elf ||
        !GetModuleFileNameExA(dc->hProcess, (HMODULE)base, 
                              dc->module[dc->num_module - 1].name,
                              sizeof(dc->module[dc->num_module - 1].name)))
        lstrcpynA(dc->module[dc->num_module - 1].name, name,
                  sizeof(dc->module[dc->num_module - 1].name));
    dc->module[dc->num_module - 1].base = base;
    dc->module[dc->num_module - 1].size = size;
    dc->module[dc->num_module - 1].timestamp = timestamp;
    dc->module[dc->num_module - 1].checksum = checksum;
    dc->module[dc->num_module - 1].is_elf = is_elf;

    return TRUE;
}

/******************************************************************
 *		fetch_pe_module_info_cb
 *
 * Callback for accumulating in dump_context a PE modules set
 */
static BOOL WINAPI fetch_pe_module_info_cb(char* name, DWORD base, DWORD size,
                                           void* user)
{
    struct dump_context*        dc = (struct dump_context*)user;
    IMAGE_NT_HEADERS            nth;

    if (pe_load_nt_header(dc->hProcess, base, &nth))
        add_module((struct dump_context*)user, name, base, size, 
                   nth.FileHeader.TimeDateStamp, nth.OptionalHeader.CheckSum,
                   FALSE);
    return TRUE;
}

/******************************************************************
 *		fetch_elf_module_info_cb
 *
 * Callback for accumulating in dump_context an ELF modules set
 */
static BOOL fetch_elf_module_info_cb(const char* name, unsigned long base, 
                                     void* user)
{
    struct dump_context*        dc = (struct dump_context*)user;
    DWORD size, checksum;

    /* FIXME: there's no relevant timestamp on ELF modules */
    /* NB: if we have a non-null base from the live-target use it (whenever
     * the ELF module is relocatable or not). If we have a null base (ELF
     * module isn't relocatable) then grab its base address from ELF file
     */
    if (!elf_fetch_file_info(name, base ? NULL : &base, &size, &checksum))
        size = checksum = 0;
    add_module(dc, name, base, size, 0 /* FIXME */, checksum, TRUE);
    return TRUE;
}

static void fetch_module_info(struct dump_context* dc)
{
    EnumerateLoadedModules(dc->hProcess, fetch_pe_module_info_cb, dc);
    /* Since we include ELF modules in a separate stream from the regular PE ones,
     * we can always include those ELF modules (they don't eat lots of space)
     * And it's always a good idea to have a trace of the loaded ELF modules for
     * a given application in a post mortem debugging condition.
     */
    elf_enum_modules(dc->hProcess, fetch_elf_module_info_cb, dc);
}

/******************************************************************
 *		add_memory_block
 *
 * Add a memory block to be dumped in a minidump
 * If rva is non 0, it's the rva in the minidump where has to be stored
 * also the rva of the memory block when written (this allows to reference
 * a memory block from outside the list of memory blocks).
 */
static void add_memory_block(struct dump_context* dc, ULONG64 base, ULONG size, ULONG rva)
{
    if (dc->mem)
        dc->mem = HeapReAlloc(GetProcessHeap(), 0, dc->mem, 
                              ++dc->num_mem * sizeof(*dc->mem));
    else
        dc->mem = HeapAlloc(GetProcessHeap(), 0, ++dc->num_mem * sizeof(*dc->mem));
    if (dc->mem)
    {
        dc->mem[dc->num_mem - 1].base = base;
        dc->mem[dc->num_mem - 1].size = size;
        dc->mem[dc->num_mem - 1].rva  = rva;
    }
    else dc->num_mem = 0;
}

/******************************************************************
 *		writeat
 *
 * Writes a chunk of data at a given position in the minidump
 */
static void writeat(struct dump_context* dc, RVA rva, void* data, unsigned size)
{
    DWORD       written;

    SetFilePointer(dc->hFile, rva, NULL, FILE_BEGIN);
    WriteFile(dc->hFile, data, size, &written, NULL);
}

/******************************************************************
 *		append
 *
 * writes a new chunk of data to the minidump, increasing the current
 * rva in dc
 */
static void append(struct dump_context* dc, void* data, unsigned size)
{
    writeat(dc, dc->rva, data, size);
    dc->rva += size;
}

/******************************************************************
 *		dump_exception_info
 *
 * Write in File the exception information from pcs
 */
static  void    dump_exception_info(struct dump_context* dc,
                                    const MINIDUMP_EXCEPTION_INFORMATION* except)
{
    MINIDUMP_EXCEPTION_STREAM   mdExcpt;
    EXCEPTION_RECORD            rec, *prec;
    CONTEXT                     ctx, *pctx;
    int                         i;

    mdExcpt.ThreadId = except->ThreadId;
    mdExcpt.__alignment = 0;
    if (except->ClientPointers)
    {
        EXCEPTION_POINTERS      ep;

        ReadProcessMemory(dc->hProcess, 
                          except->ExceptionPointers, &ep, sizeof(ep), NULL);
        ReadProcessMemory(dc->hProcess, 
                          ep.ExceptionRecord, &rec, sizeof(rec), NULL);
        ReadProcessMemory(dc->hProcess, 
                          ep.ContextRecord, &ctx, sizeof(ctx), NULL);
        prec = &rec;
        pctx = &ctx;
        
    }
    else
    {
        prec = except->ExceptionPointers->ExceptionRecord;
        pctx = except->ExceptionPointers->ContextRecord;
    }
    mdExcpt.ExceptionRecord.ExceptionCode = prec->ExceptionCode;
    mdExcpt.ExceptionRecord.ExceptionFlags = prec->ExceptionFlags;
    mdExcpt.ExceptionRecord.ExceptionRecord = (DWORD_PTR)prec->ExceptionRecord;
    mdExcpt.ExceptionRecord.ExceptionAddress = (DWORD_PTR)prec->ExceptionAddress;
    mdExcpt.ExceptionRecord.NumberParameters = prec->NumberParameters;
    mdExcpt.ExceptionRecord.__unusedAlignment = 0;
    for (i = 0; i < mdExcpt.ExceptionRecord.NumberParameters; i++)
        mdExcpt.ExceptionRecord.ExceptionInformation[i] = (DWORD_PTR)prec->ExceptionInformation[i];
    mdExcpt.ThreadContext.DataSize = sizeof(*pctx);
    mdExcpt.ThreadContext.Rva = dc->rva + sizeof(mdExcpt);

    append(dc, &mdExcpt, sizeof(mdExcpt));
    append(dc, pctx, sizeof(*pctx));
}

/******************************************************************
 *		dump_modules
 *
 * Write in File the modules from pcs
 */
static  void    dump_modules(struct dump_context* dc, BOOL dump_elf)
{
    MINIDUMP_MODULE             mdModule;
    MINIDUMP_MODULE_LIST        mdModuleList;
    char                        tmp[1024];
    MINIDUMP_STRING*            ms = (MINIDUMP_STRING*)tmp;
    ULONG                       i, nmod;
    RVA                         rva_base;
    DWORD                       flags_out;

    for (i = nmod = 0; i < dc->num_module; i++)
    {
        if ((dc->module[i].is_elf && dump_elf) ||
            (!dc->module[i].is_elf && !dump_elf))
            nmod++;
    }

    mdModuleList.NumberOfModules = 0;
    /* reserve space for mdModuleList
     * FIXME: since we don't support 0 length arrays, we cannot use the
     * size of mdModuleList
     * FIXME: if we don't ask for all modules in cb, we'll get a hole in the file
     */
    rva_base = dc->rva;
    dc->rva += sizeof(mdModuleList.NumberOfModules) + sizeof(mdModule) * nmod;
    for (i = 0; i < dc->num_module; i++)
    {
        if ((dc->module[i].is_elf && !dump_elf) ||
            (!dc->module[i].is_elf && dump_elf))
            continue;

        flags_out = ModuleWriteModule | ModuleWriteMiscRecord | ModuleWriteCvRecord;
        if (dc->type & MiniDumpWithDataSegs)
            flags_out |= ModuleWriteDataSeg;
        if (dc->type & MiniDumpWithProcessThreadData)
            flags_out |= ModuleWriteTlsData;
        if (dc->type & MiniDumpWithCodeSegs)
            flags_out |= ModuleWriteCodeSegs;
        ms->Length = MultiByteToWideChar(CP_ACP, 0, 
                                         dc->module[i].name, -1,
                                         NULL, 0) * sizeof(WCHAR);
        if (sizeof(ULONG) + ms->Length > sizeof(tmp))
            FIXME("Buffer overflow!!!\n");
        MultiByteToWideChar(CP_ACP, 0, dc->module[i].name, -1,
                            ms->Buffer, ms->Length/sizeof(WCHAR));

        if (dc->cb)
        {
            MINIDUMP_CALLBACK_INPUT     cbin;
            MINIDUMP_CALLBACK_OUTPUT    cbout;

            cbin.ProcessId = dc->pid;
            cbin.ProcessHandle = dc->hProcess;
            cbin.CallbackType = ModuleCallback;

            cbin.u.Module.FullPath = ms->Buffer;
            cbin.u.Module.BaseOfImage = dc->module[i].base;
            cbin.u.Module.SizeOfImage = dc->module[i].size;
            cbin.u.Module.CheckSum = dc->module[i].checksum;
            cbin.u.Module.TimeDateStamp = dc->module[i].timestamp;
            memset(&cbin.u.Module.VersionInfo, 0, sizeof(cbin.u.Module.VersionInfo));
            cbin.u.Module.CvRecord = NULL;
            cbin.u.Module.SizeOfCvRecord = 0;
            cbin.u.Module.MiscRecord = NULL;
            cbin.u.Module.SizeOfMiscRecord = 0;

            cbout.u.ModuleWriteFlags = flags_out;
            if (!dc->cb->CallbackRoutine(dc->cb->CallbackParam, &cbin, &cbout))
                continue;
            flags_out &= cbout.u.ModuleWriteFlags;
        }
        if (flags_out & ModuleWriteModule)
        {
            mdModule.BaseOfImage = dc->module[i].base;
            mdModule.SizeOfImage = dc->module[i].size;
            mdModule.CheckSum = dc->module[i].checksum;
            mdModule.TimeDateStamp = dc->module[i].timestamp;
            mdModule.ModuleNameRva = dc->rva;
            ms->Length -= sizeof(WCHAR);
            append(dc, ms, sizeof(ULONG) + ms->Length);
            memset(&mdModule.VersionInfo, 0, sizeof(mdModule.VersionInfo)); /* FIXME */
            mdModule.CvRecord.DataSize = 0; /* FIXME */
            mdModule.CvRecord.Rva = 0; /* FIXME */
            mdModule.MiscRecord.DataSize = 0; /* FIXME */
            mdModule.MiscRecord.Rva = 0; /* FIXME */
            mdModule.Reserved0 = 0; /* FIXME */
            mdModule.Reserved1 = 0; /* FIXME */
            writeat(dc,
                    rva_base + sizeof(mdModuleList.NumberOfModules) + 
                        mdModuleList.NumberOfModules++ * sizeof(mdModule), 
                    &mdModule, sizeof(mdModule));
        }
    }
    writeat(dc, rva_base, &mdModuleList.NumberOfModules, 
            sizeof(mdModuleList.NumberOfModules));
}

/******************************************************************
 *		dump_system_info
 *
 * Dumps into File the information about the system
 */
static  void    dump_system_info(struct dump_context* dc)
{
    MINIDUMP_SYSTEM_INFO        mdSysInfo;
    SYSTEM_INFO                 sysInfo;
    OSVERSIONINFOW              osInfo;
    DWORD                       written;
    ULONG                       slen;

    GetSystemInfo(&sysInfo);
    osInfo.dwOSVersionInfoSize = sizeof(osInfo);
    GetVersionExW(&osInfo);

    mdSysInfo.ProcessorArchitecture = sysInfo.u.s.wProcessorArchitecture;
    mdSysInfo.ProcessorLevel = sysInfo.wProcessorLevel;
    mdSysInfo.ProcessorRevision = sysInfo.wProcessorRevision;
    mdSysInfo.u.s.NumberOfProcessors = sysInfo.dwNumberOfProcessors;
    mdSysInfo.u.s.ProductType = VER_NT_WORKSTATION; /* FIXME */
    mdSysInfo.MajorVersion = osInfo.dwMajorVersion;
    mdSysInfo.MinorVersion = osInfo.dwMinorVersion;
    mdSysInfo.BuildNumber = osInfo.dwBuildNumber;
    mdSysInfo.PlatformId = osInfo.dwPlatformId;

    mdSysInfo.CSDVersionRva = dc->rva + sizeof(mdSysInfo);
    mdSysInfo.u1.Reserved1 = 0;

    memset(&mdSysInfo.Cpu, 0, sizeof(mdSysInfo.Cpu));

    append(dc, &mdSysInfo, sizeof(mdSysInfo));

    slen = lstrlenW(osInfo.szCSDVersion) * sizeof(WCHAR);
    WriteFile(dc->hFile, &slen, sizeof(slen), &written, NULL);
    WriteFile(dc->hFile, osInfo.szCSDVersion, slen, &written, NULL);
    dc->rva += sizeof(ULONG) + slen;
}

/******************************************************************
 *		dump_threads
 *
 * Dumps into File the information about running threads
 */
static  void    dump_threads(struct dump_context* dc)
{
    MINIDUMP_THREAD             mdThd;
    MINIDUMP_THREAD_LIST        mdThdList;
    unsigned                    i;
    RVA                         rva_base;
    DWORD                       flags_out;
    CONTEXT                     ctx;

    mdThdList.NumberOfThreads = 0;

    rva_base = dc->rva;
    dc->rva += sizeof(mdThdList.NumberOfThreads) +
        dc->spi->dwThreadCount * sizeof(mdThd);

    for (i = 0; i < dc->spi->dwThreadCount; i++)
    {
        fetch_thread_info(dc, i, &mdThd, &ctx);

        flags_out = ThreadWriteThread | ThreadWriteStack | ThreadWriteContext |
            ThreadWriteInstructionWindow;
        if (dc->type & MiniDumpWithProcessThreadData)
            flags_out |= ThreadWriteThreadData;
        if (dc->type & MiniDumpWithThreadInfo)
            flags_out |= ThreadWriteThreadInfo;

        if (dc->cb)
        {
            MINIDUMP_CALLBACK_INPUT     cbin;
            MINIDUMP_CALLBACK_OUTPUT    cbout;

            cbin.ProcessId = dc->pid;
            cbin.ProcessHandle = dc->hProcess;
            cbin.CallbackType = ThreadCallback;
            cbin.u.Thread.ThreadId = dc->spi->ti[i].dwThreadID;
            cbin.u.Thread.ThreadHandle = 0; /* FIXME */
            memcpy(&cbin.u.Thread.Context, &ctx, sizeof(CONTEXT));
            cbin.u.Thread.SizeOfContext = sizeof(CONTEXT);
            cbin.u.Thread.StackBase = mdThd.Stack.StartOfMemoryRange;
            cbin.u.Thread.StackEnd = mdThd.Stack.StartOfMemoryRange +
                mdThd.Stack.Memory.DataSize;

            cbout.u.ThreadWriteFlags = flags_out;
            if (!dc->cb->CallbackRoutine(dc->cb->CallbackParam, &cbin, &cbout))
                continue;
            flags_out &= cbout.u.ThreadWriteFlags;
        }
        if (flags_out & ThreadWriteThread)
        {
            if (ctx.ContextFlags && (flags_out & ThreadWriteContext))
            {
                mdThd.ThreadContext.Rva = dc->rva;
                mdThd.ThreadContext.DataSize = sizeof(CONTEXT);
                append(dc, &ctx, sizeof(CONTEXT));
            }
            if (mdThd.Stack.Memory.DataSize && (flags_out & ThreadWriteStack))
            {
                add_memory_block(dc, mdThd.Stack.StartOfMemoryRange,
                                 mdThd.Stack.Memory.DataSize,
                                 rva_base + sizeof(mdThdList.NumberOfThreads) +
                                     mdThdList.NumberOfThreads * sizeof(mdThd) +
                                     FIELD_OFFSET(MINIDUMP_THREAD, Stack.Memory.Rva));
            }
            writeat(dc, 
                    rva_base + sizeof(mdThdList.NumberOfThreads) +
                        mdThdList.NumberOfThreads * sizeof(mdThd),
                    &mdThd, sizeof(mdThd));
            mdThdList.NumberOfThreads++;
        }
        if (ctx.ContextFlags && (flags_out & ThreadWriteInstructionWindow))
        {
            /* FIXME: - Native dbghelp also dumps 0x80 bytes around EIP
             *        - also crop values across module boundaries, 
             *        - and don't make it i386 dependent 
             */
            /* add_memory_block(dc, ctx.Eip - 0x80, ctx.Eip + 0x80, 0); */
        }
    }
    writeat(dc, rva_base,
            &mdThdList.NumberOfThreads, sizeof(mdThdList.NumberOfThreads));
}

/******************************************************************
 *		dump_memory_info
 *
 * dumps information about the memory of the process (stack of the threads)
 */
static void dump_memory_info(struct dump_context* dc)
{
    MINIDUMP_MEMORY_LIST        mdMemList;
    MINIDUMP_MEMORY_DESCRIPTOR  mdMem;
    DWORD                       written;
    unsigned                    i, pos, len;
    RVA                         rva_base;
    char                        tmp[1024];

    mdMemList.NumberOfMemoryRanges = dc->num_mem;
    append(dc, &mdMemList.NumberOfMemoryRanges,
           sizeof(mdMemList.NumberOfMemoryRanges));
    rva_base = dc->rva;
    dc->rva += mdMemList.NumberOfMemoryRanges * sizeof(mdMem);

    for (i = 0; i < dc->num_mem; i++)
    {
        mdMem.StartOfMemoryRange = dc->mem[i].base;
        mdMem.Memory.Rva = dc->rva;
        mdMem.Memory.DataSize = dc->mem[i].size;
        SetFilePointer(dc->hFile, dc->rva, NULL, FILE_BEGIN);
        for (pos = 0; pos < dc->mem[i].size; pos += sizeof(tmp))
        {
            len = min(dc->mem[i].size - pos, sizeof(tmp));
            if (ReadProcessMemory(dc->hProcess, 
                                  (void*)(ULONG)(dc->mem[i].base + pos), 
                                  tmp, len, NULL))
                WriteFile(dc->hFile, tmp, len, &written, NULL);
        }
        dc->rva += mdMem.Memory.DataSize;
        writeat(dc, rva_base + i * sizeof(mdMem), &mdMem, sizeof(mdMem));
        if (dc->mem[i].rva)
        {
            writeat(dc, dc->mem[i].rva, &mdMem.Memory.Rva, sizeof(mdMem.Memory.Rva));
        }
    }
}

static void dump_misc_info(struct dump_context* dc)
{
    MINIDUMP_MISC_INFO  mmi;

    mmi.SizeOfInfo = sizeof(mmi);
    mmi.Flags1 = MINIDUMP_MISC1_PROCESS_ID;
    mmi.ProcessId = dc->pid;
    /* FIXME: create/user/kernel time */
    append(dc, &mmi, sizeof(mmi));
}

/******************************************************************
 *		MiniDumpWriteDump (DEBUGHLP.@)
 *
 */
BOOL WINAPI MiniDumpWriteDump(HANDLE hProcess, DWORD pid, HANDLE hFile,
                              MINIDUMP_TYPE DumpType,
                              PMINIDUMP_EXCEPTION_INFORMATION ExceptionParam,
                              PMINIDUMP_USER_STREAM_INFORMATION UserStreamParam,
                              PMINIDUMP_CALLBACK_INFORMATION CallbackParam)
{
    MINIDUMP_HEADER     mdHead;
    MINIDUMP_DIRECTORY  mdDir;
    DWORD               i, nStreams, idx_stream;
    struct dump_context dc;

    dc.hProcess = hProcess;
    dc.hFile = hFile;
    dc.pid = pid;
    dc.module = NULL;
    dc.num_module = 0;
    dc.cb = CallbackParam;
    dc.type = DumpType;
    dc.mem = NULL;
    dc.num_mem = 0;
    dc.rva = 0;

    if (!fetch_process_info(&dc)) return FALSE;
    fetch_module_info(&dc);

    /* 1) init */
    nStreams = 6 + (ExceptionParam ? 1 : 0) +
        (UserStreamParam ? UserStreamParam->UserStreamCount : 0);

    if (DumpType & MiniDumpWithDataSegs)
        FIXME("NIY MiniDumpWithDataSegs\n");
    if (DumpType & MiniDumpWithFullMemory)
        FIXME("NIY MiniDumpWithFullMemory\n");
    if (DumpType & MiniDumpWithHandleData)
        FIXME("NIY MiniDumpWithHandleData\n");
    if (DumpType & MiniDumpFilterMemory)
        FIXME("NIY MiniDumpFilterMemory\n");
    if (DumpType & MiniDumpScanMemory)
        FIXME("NIY MiniDumpScanMemory\n");

    /* 2) write header */
    mdHead.Signature = MINIDUMP_SIGNATURE;
    mdHead.Version = MINIDUMP_VERSION;
    mdHead.NumberOfStreams = nStreams;
    mdHead.StreamDirectoryRva = sizeof(mdHead);
    mdHead.u.TimeDateStamp = time(NULL);
    mdHead.Flags = DumpType;
    append(&dc, &mdHead, sizeof(mdHead));

    /* 3) write stream directories */
    dc.rva += nStreams * sizeof(mdDir);
    idx_stream = 0;

    /* 3.1) write data stream directories */

    mdDir.StreamType = ThreadListStream;
    mdDir.Location.Rva = dc.rva;
    dump_threads(&dc);
    mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
    writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir), 
            &mdDir, sizeof(mdDir));

    mdDir.StreamType = ModuleListStream;
    mdDir.Location.Rva = dc.rva;
    dump_modules(&dc, FALSE);
    mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
    writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
            &mdDir, sizeof(mdDir));

    mdDir.StreamType = 0xfff0; /* FIXME: this is part of MS reserved streams */
    mdDir.Location.Rva = dc.rva;
    dump_modules(&dc, TRUE);
    mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
    writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
            &mdDir, sizeof(mdDir));

    mdDir.StreamType = MemoryListStream;
    mdDir.Location.Rva = dc.rva;
    dump_memory_info(&dc);
    mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
    writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
            &mdDir, sizeof(mdDir));

    mdDir.StreamType = SystemInfoStream;
    mdDir.Location.Rva = dc.rva;
    dump_system_info(&dc);
    mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
    writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
            &mdDir, sizeof(mdDir));

    mdDir.StreamType = MiscInfoStream;
    mdDir.Location.Rva = dc.rva;
    dump_misc_info(&dc);
    mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
    writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
            &mdDir, sizeof(mdDir));

    /* 3.2) write exception information (if any) */
    if (ExceptionParam)
    {
        mdDir.StreamType = ExceptionStream;
        mdDir.Location.Rva = dc.rva;
        dump_exception_info(&dc, ExceptionParam);
        mdDir.Location.DataSize = dc.rva - mdDir.Location.Rva;
        writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
                &mdDir, sizeof(mdDir));
    }

    /* 3.3) write user defined streams (if any) */
    if (UserStreamParam)
    {
        for (i = 0; i < UserStreamParam->UserStreamCount; i++)
        {
            mdDir.StreamType = UserStreamParam->UserStreamArray[i].Type;
            mdDir.Location.DataSize = UserStreamParam->UserStreamArray[i].BufferSize;
            mdDir.Location.Rva = dc.rva;
            writeat(&dc, mdHead.StreamDirectoryRva + idx_stream++ * sizeof(mdDir),
                    &mdDir, sizeof(mdDir));
            append(&dc, UserStreamParam->UserStreamArray[i].Buffer, 
                   UserStreamParam->UserStreamArray[i].BufferSize);
        }
    }

    HeapFree(GetProcessHeap(), 0, dc.pcs_buffer);
    HeapFree(GetProcessHeap(), 0, dc.mem);
    HeapFree(GetProcessHeap(), 0, dc.module);

    return TRUE;
}

/******************************************************************
 *		MiniDumpReadDumpStream (DEBUGHLP.@)
 *
 *
 */
BOOL WINAPI MiniDumpReadDumpStream(void* base, ULONG str_idx,
                                   PMINIDUMP_DIRECTORY* pdir,
                                   void** stream, ULONG* size)
{
    MINIDUMP_HEADER*    mdHead = (MINIDUMP_HEADER*)base;

    if (mdHead->Signature == MINIDUMP_SIGNATURE)
    {
        MINIDUMP_DIRECTORY* dir;
        int                 i;

        dir = (MINIDUMP_DIRECTORY*)((char*)base + mdHead->StreamDirectoryRva);
        for (i = 0; i < mdHead->NumberOfStreams; i++, dir++)
        {
            if (dir->StreamType == str_idx)
            {
                *pdir = dir;
                *stream = (char*)base + dir->Location.Rva;
                *size = dir->Location.DataSize;
                return TRUE;
            }
        }
    }
    SetLastError(ERROR_INVALID_PARAMETER);
    return FALSE;
}