Linux: Add Breakpad client.

breakpad/linux/minidump_file_writer.cc

Index: breakpad/linux/minidump_file_writer.cc
diff --git a/breakpad/linux/minidump_file_writer.cc b/breakpad/linux/minidump_file_writer.cc
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index 0000000000000000000000000000000000000000..6b024166b9fdae85af732b48acd5c745ccbddacb
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+++ b/breakpad/linux/minidump_file_writer.cc
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+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// minidump_file_writer.cc: Minidump file writer implementation.
+//
+// See minidump_file_writer.h for documentation.
+
+#include <fcntl.h>
+#include <limits.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "breakpad/linux/linux_syscall_support.h"
+#include "breakpad/linux/linux_libc_support.h"
+#include "client/minidump_file_writer-inl.h"
+#include "common/string_conversion.h"
+
+namespace google_breakpad {
+
+const MDRVA MinidumpFileWriter::kInvalidMDRVA = static_cast<MDRVA>(-1);
+
+MinidumpFileWriter::MinidumpFileWriter() : file_(-1), position_(0), size_(0) {
+}
+
+MinidumpFileWriter::~MinidumpFileWriter() {
+  Close();
+}
+
+bool MinidumpFileWriter::Open(const char *path) {
+  assert(file_ == -1);
+  file_ = sys_open(path, O_WRONLY | O_CREAT | O_EXCL, 0600);
+
+  return file_ != -1;
+}
+
+bool MinidumpFileWriter::Close() {
+  bool result = true;
+
+  if (file_ != -1) {
+    ftruncate(file_, position_);
+    result = (sys_close(file_) == 0);
+    file_ = -1;
+  }
+
+  return result;
+}
+
+bool MinidumpFileWriter::CopyStringToMDString(const wchar_t *str,
+                                              unsigned int length,
+                                              TypedMDRVA<MDString> *mdstring) {
+  bool result = true;
+  if (sizeof(wchar_t) == sizeof(u_int16_t)) {
+    // Shortcut if wchar_t is the same size as MDString's buffer
+    result = mdstring->Copy(str, mdstring->get()->length);
+  } else {
+    u_int16_t out[2];
+    int out_idx = 0;
+    
+    // Copy the string character by character
+    while (length && result) {
+      UTF32ToUTF16Char(*str, out);
+      if (!out[0])
+        return false;
+      
+      // Process one character at a time
+      --length;
+      ++str;
+      
+      // Append the one or two UTF-16 characters.  The first one will be non-
+      // zero, but the second one may be zero, depending on the conversion from
+      // UTF-32.
+      int out_count = out[1] ? 2 : 1;
+      int out_size = sizeof(u_int16_t) * out_count;
+      result = mdstring->CopyIndexAfterObject(out_idx, out, out_size);
+      out_idx += out_count;
+    }
+  }
+  return result;
+}
+
+bool MinidumpFileWriter::CopyStringToMDString(const char *str,
+                                              unsigned int length,
+                                              TypedMDRVA<MDString> *mdstring) {
+  bool result = true;
+  u_int16_t out[2];
+  int out_idx = 0;
+
+  // Copy the string character by character
+  while (length && result) {
+    int conversion_count = UTF8ToUTF16Char(str, length, out);
+    if (!conversion_count)
+      return false;
+    
+    // Move the pointer along based on the nubmer of converted characters
+    length -= conversion_count;
+    str += conversion_count;
+    
+    // Append the one or two UTF-16 characters
+    int out_count = out[1] ? 2 : 1;
+    int out_size = sizeof(u_int16_t) * out_count;
+    result = mdstring->CopyIndexAfterObject(out_idx, out, out_size);
+    out_idx += out_count;
+  }
+  return result;
+}
+
+template <typename CharType>
+bool MinidumpFileWriter::WriteStringCore(const CharType *str,
+                                         unsigned int length,
+                                         MDLocationDescriptor *location) {
+  assert(str);
+  assert(location);
+  // Calculate the mdstring length by either limiting to |length| as passed in
+  // or by finding the location of the NULL character.
+  unsigned int mdstring_length = 0;
+  if (!length)
+    length = INT_MAX;
+  for (; mdstring_length < length && str[mdstring_length]; ++mdstring_length)
+    ;
+
+  // Allocate the string buffer
+  TypedMDRVA<MDString> mdstring(this);
+  if (!mdstring.AllocateObjectAndArray(mdstring_length + 1, sizeof(u_int16_t)))
+    return false;
+
+  // Set length excluding the NULL and copy the string
+  mdstring.get()->length = mdstring_length * sizeof(u_int16_t);
+  bool result = CopyStringToMDString(str, mdstring_length, &mdstring);
+
+  // NULL terminate
+  if (result) {
+    u_int16_t ch = 0;
+    result = mdstring.CopyIndexAfterObject(mdstring_length, &ch, sizeof(ch));
+
+    if (result)
+      *location = mdstring.location();
+  }
+
+  return result;
+}
+
+bool MinidumpFileWriter::WriteString(const wchar_t *str, unsigned int length,
+                 MDLocationDescriptor *location) {
+  return WriteStringCore(str, length, location);
+}
+
+bool MinidumpFileWriter::WriteString(const char *str, unsigned int length,
+                 MDLocationDescriptor *location) {
+  return WriteStringCore(str, length, location);
+}
+
+bool MinidumpFileWriter::WriteMemory(const void *src, size_t size,
+                                     MDMemoryDescriptor *output) {
+  assert(src);
+  assert(output);
+  UntypedMDRVA mem(this);
+
+  if (!mem.Allocate(size))
+    return false;
+  if (!mem.Copy(src, mem.size()))
+    return false;
+
+  output->start_of_memory_range = reinterpret_cast<u_int64_t>(src);
+  output->memory = mem.location();
+
+  return true;
+}
+
+MDRVA MinidumpFileWriter::Allocate(size_t size) {
+  assert(size);
+  assert(file_ != -1);
+  size_t aligned_size = (size + 7) & ~7;  // 64-bit alignment
+
+  if (position_ + aligned_size > size_) {
+    size_t growth = aligned_size;
+    size_t minimal_growth = getpagesize();
+
+    // Ensure that the file grows by at least the size of a memory page
+    if (growth < minimal_growth)
+      growth = minimal_growth;
+
+    size_t new_size = size_ + growth;
+    if (ftruncate(file_, new_size) != 0)
+      return kInvalidMDRVA;
+
+    size_ = new_size;
+  }
+
+  MDRVA current_position = position_;
+  position_ += static_cast<MDRVA>(aligned_size);
+
+  return current_position;
+}
+
+bool MinidumpFileWriter::Copy(MDRVA position, const void *src, ssize_t size) {
+  assert(src);
+  assert(size);
+  assert(file_ != -1);
+
+  // Ensure that the data will fit in the allocated space
+  if (size + position > size_)
+    return false;
+
+  // Seek and write the data
+  if (sys_lseek(file_, position, SEEK_SET) == static_cast<off_t>(position)) {
+    if (sys_write(file_, src, size) == size)
+      return true;
+  }
+
+  return false;
+}
+
+bool UntypedMDRVA::Allocate(size_t size) {
+  assert(size_ == 0);
+  size_ = size;
+  position_ = writer_->Allocate(size_);
+  return position_ != MinidumpFileWriter::kInvalidMDRVA;
+}
+
+bool UntypedMDRVA::Copy(MDRVA position, const void *src, size_t size) {
+  assert(src);
+  assert(size);
+  assert(position + size <= position_ + size_);
+  return writer_->Copy(position, src, size);
+}
+
+}  // namespace google_breakpad