--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libiberty/simple-object.c	Sun Aug 21 07:07:55 2011 +0900
@@ -0,0 +1,422 @@
+/* simple-object.c -- simple routines to read and write object files.
+   Copyright 2010 Free Software Foundation, Inc.
+   Written by Ian Lance Taylor, Google.
+
+This program is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+This program 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 General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+#include "config.h"
+#include "libiberty.h"
+#include "simple-object.h"
+
+#include <errno.h>
+
+#ifdef HAVE_STDLIB_H
+#include <stdlib.h>
+#endif
+
+#ifdef HAVE_STDINT_H
+#include <stdint.h>
+#endif
+
+#ifdef HAVE_STRING_H
+#include <string.h>
+#endif
+
+#ifdef HAVE_INTTYPES_H
+#include <inttypes.h>
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET 0
+#endif
+
+#include "simple-object-common.h"
+
+/* The known object file formats.  */
+
+static const struct simple_object_functions * const format_functions[] =
+{
+  &simple_object_elf_functions,
+  &simple_object_mach_o_functions,
+  &simple_object_coff_functions
+};
+
+/* Read data from a file using the simple_object error reporting
+   conventions.  */
+
+int
+simple_object_internal_read (int descriptor, off_t offset,
+			     unsigned char *buffer, size_t size,
+			     const char **errmsg, int *err)
+{
+  ssize_t got;
+
+  if (lseek (descriptor, offset, SEEK_SET) < 0)
+    {
+      *errmsg = "lseek";
+      *err = errno;
+      return 0;
+    }
+
+  got = read (descriptor, buffer, size);
+  if (got < 0)
+    {
+      *errmsg = "read";
+      *err = errno;
+      return 0;
+    }
+
+  if ((size_t) got < size)
+    {
+      *errmsg = "file too short";
+      *err = 0;
+      return 0;
+    }
+
+  return 1;
+}
+
+/* Write data to a file using the simple_object error reporting
+   conventions.  */
+
+int
+simple_object_internal_write (int descriptor, off_t offset,
+			      const unsigned char *buffer, size_t size,
+			      const char **errmsg, int *err)
+{
+  ssize_t wrote;
+
+  if (lseek (descriptor, offset, SEEK_SET) < 0)
+    {
+      *errmsg = "lseek";
+      *err = errno;
+      return 0;
+    }
+
+  wrote = write (descriptor, buffer, size);
+  if (wrote < 0)
+    {
+      *errmsg = "write";
+      *err = errno;
+      return 0;
+    }
+
+  if ((size_t) wrote < size)
+    {
+      *errmsg = "short write";
+      *err = 0;
+      return 0;
+    }
+
+  return 1;
+}
+
+/* Open for read.  */
+
+simple_object_read *
+simple_object_start_read (int descriptor, off_t offset,
+			  const char *segment_name, const char **errmsg,
+			  int *err)
+{
+  unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN];
+  size_t len, i;
+
+  if (!simple_object_internal_read (descriptor, offset, header,
+				    SIMPLE_OBJECT_MATCH_HEADER_LEN,
+				    errmsg, err))
+    return NULL;
+
+  len = sizeof (format_functions) / sizeof (format_functions[0]);
+  for (i = 0; i < len; ++i)
+    {
+      void *data;
+
+      data = format_functions[i]->match (header, descriptor, offset,
+					 segment_name, errmsg, err);
+      if (data != NULL)
+	{
+	  simple_object_read *ret;
+
+	  ret = XNEW (simple_object_read);
+	  ret->descriptor = descriptor;
+	  ret->offset = offset;
+	  ret->functions = format_functions[i];
+	  ret->data = data;
+	  return ret;
+	}
+    }
+
+  *errmsg = "file not recognized";
+  *err = 0;
+  return NULL;
+}
+
+/* Find all sections.  */
+
+const char *
+simple_object_find_sections (simple_object_read *sobj,
+			     int (*pfn) (void *, const char *, off_t, off_t),
+			     void *data,
+			     int *err)
+{
+  return sobj->functions->find_sections (sobj, pfn, data, err);
+}
+
+/* Internal data passed to find_one_section.  */
+
+struct find_one_section_data
+{
+  /* The section we are looking for.  */
+  const char *name;
+  /* Where to store the section offset.  */
+  off_t *offset;
+  /* Where to store the section length.  */
+  off_t *length;
+  /* Set if the name is found.  */
+  int found;
+};
+
+/* Internal function passed to find_sections.  */
+
+static int
+find_one_section (void *data, const char *name, off_t offset, off_t length)
+{
+  struct find_one_section_data *fosd = (struct find_one_section_data *) data;
+
+  if (strcmp (name, fosd->name) != 0)
+    return 1;
+
+  *fosd->offset = offset;
+  *fosd->length = length;
+  fosd->found = 1;
+
+  /* Stop iteration.  */
+  return 0;
+}
+
+/* Find a section.  */
+
+int
+simple_object_find_section (simple_object_read *sobj, const char *name,
+			    off_t *offset, off_t *length,
+			    const char **errmsg, int *err)
+{
+  struct find_one_section_data fosd;
+
+  fosd.name = name;
+  fosd.offset = offset;
+  fosd.length = length;
+  fosd.found = 0;
+
+  *errmsg = simple_object_find_sections (sobj, find_one_section,
+					 (void *) &fosd, err);
+  if (*errmsg != NULL)
+    return 0;
+  if (!fosd.found)
+    return 0;
+  return 1;
+}
+
+/* Fetch attributes.  */
+
+simple_object_attributes *
+simple_object_fetch_attributes (simple_object_read *sobj, const char **errmsg,
+				int *err)
+{
+  void *data;
+  simple_object_attributes *ret;
+
+  data = sobj->functions->fetch_attributes (sobj, errmsg, err);
+  if (data == NULL)
+    return NULL;
+  ret = XNEW (simple_object_attributes);
+  ret->functions = sobj->functions;
+  ret->data = data;
+  return ret;
+}
+
+/* Release an simple_object_read.  */
+
+void
+simple_object_release_read (simple_object_read *sobj)
+{
+  sobj->functions->release_read (sobj->data);
+  XDELETE (sobj);
+}
+
+/* Merge attributes.  */
+
+const char *
+simple_object_attributes_merge (simple_object_attributes *to,
+				simple_object_attributes *from,
+				int *err)
+{
+  if (to->functions != from->functions)
+    {
+      *err = 0;
+      return "different object file format";
+    }
+  return to->functions->attributes_merge (to->data, from->data, err);
+}
+
+/* Release an attributes structure.  */
+
+void
+simple_object_release_attributes (simple_object_attributes *attrs)
+{
+  attrs->functions->release_attributes (attrs->data);
+  XDELETE (attrs);
+}
+
+/* Start creating an object file.  */
+
+simple_object_write *
+simple_object_start_write (simple_object_attributes *attrs,
+			   const char *segment_name, const char **errmsg,
+			   int *err)
+{
+  void *data;
+  simple_object_write *ret;
+
+  data = attrs->functions->start_write (attrs->data, errmsg, err);
+  if (data == NULL)
+    return NULL;
+  ret = XNEW (simple_object_write);
+  ret->functions = attrs->functions;
+  ret->segment_name = xstrdup (segment_name);
+  ret->sections = NULL;
+  ret->last_section = NULL;
+  ret->data = data;
+  return ret;
+}
+
+/* Start creating a section.  */
+
+simple_object_write_section *
+simple_object_write_create_section (simple_object_write *sobj, const char *name,
+				    unsigned int align,
+				    const char **errmsg ATTRIBUTE_UNUSED,
+				    int *err ATTRIBUTE_UNUSED)
+{
+  simple_object_write_section *ret;
+
+  ret = XNEW (simple_object_write_section);
+  ret->next = NULL;
+  ret->name = xstrdup (name);
+  ret->align = align;
+  ret->buffers = NULL;
+  ret->last_buffer = NULL;
+
+  if (sobj->last_section == NULL)
+    {
+      sobj->sections = ret;
+      sobj->last_section = ret;
+    }
+  else
+    {
+      sobj->last_section->next = ret;
+      sobj->last_section = ret;
+    }
+
+  return ret;
+}
+
+/* Add data to a section.  */
+
+const char *
+simple_object_write_add_data (simple_object_write *sobj ATTRIBUTE_UNUSED,
+			      simple_object_write_section *section,
+			      const void *buffer,
+			      size_t size, int copy,
+			      int *err ATTRIBUTE_UNUSED)
+{
+  struct simple_object_write_section_buffer *wsb;
+
+  wsb = XNEW (struct simple_object_write_section_buffer);
+  wsb->next = NULL;
+  wsb->size = size;
+
+  if (!copy)
+    {
+      wsb->buffer = buffer;
+      wsb->free_buffer = NULL;
+    }
+  else
+    {
+      wsb->free_buffer = (void *) XNEWVEC (char, size);
+      memcpy (wsb->free_buffer, buffer, size);
+      wsb->buffer = wsb->free_buffer;
+    }
+
+  if (section->last_buffer == NULL)
+    {
+      section->buffers = wsb;
+      section->last_buffer = wsb;
+    }
+  else
+    {
+      section->last_buffer->next = wsb;
+      section->last_buffer = wsb;
+    }
+
+  return NULL;
+}
+
+/* Write the complete object file.  */
+
+const char *
+simple_object_write_to_file (simple_object_write *sobj, int descriptor,
+			     int *err)
+{
+  return sobj->functions->write_to_file (sobj, descriptor, err);
+}
+
+/* Release an simple_object_write.  */
+
+void
+simple_object_release_write (simple_object_write *sobj)
+{
+  simple_object_write_section *section;
+
+  free (sobj->segment_name);
+
+  section = sobj->sections;
+  while (section != NULL)
+    {
+      struct simple_object_write_section_buffer *buffer;
+      simple_object_write_section *next_section;
+
+      buffer = section->buffers;
+      while (buffer != NULL)
+	{
+	  struct simple_object_write_section_buffer *next_buffer;
+
+	  if (buffer->free_buffer != NULL)
+	    XDELETEVEC (buffer->free_buffer);
+	  next_buffer = buffer->next;
+	  XDELETE (buffer);
+	  buffer = next_buffer;
+	}
+
+      next_section = section->next;
+      free (section->name);
+      XDELETE (section);
+      section = next_section;
+    }
+
+  sobj->functions->release_write (sobj->data);
+  XDELETE (sobj);
+}