--- /dev/null
+/*
+ * image.c: Routines for manipulating an image stored in an
+ * extended PE/COFF file.
+ *
+ * Author:
+ * Miguel de Icaza (miguel@ximian.com)
+ *
+ * (C) 2001 Ximian, Inc. http://www.ximian.com
+ *
+ * TODO:
+ * Implement big-endian versions of the reading routines.
+ */
+#include <config.h>
+#include <stdio.h>
+#include <glib.h>
+#include <errno.h>
+#include <string.h>
+#include "image.h"
+#include "cil-coff.h"
+#include "rawbuffer.h"
+#include "endian.h"
+
+#define INVALID_ADDRESS 0xffffffff
+
+guint32
+cli_rva_image_map (cli_image_info_t *iinfo, guint32 addr)
+{
+ const int top = iinfo->cli_section_count;
+ section_table_t *tables = iinfo->cli_section_tables;
+ int i;
+
+ for (i = 0; i < top; i++){
+ if ((addr >= tables->st_virtual_address) &&
+ (addr < tables->st_virtual_address + tables->st_raw_data_size)){
+ return addr - tables->st_virtual_address + tables->st_raw_data_ptr;
+ }
+ tables++;
+ }
+ return INVALID_ADDRESS;
+}
+
+char *
+cli_rva_map (cli_image_info_t *iinfo, guint32 addr)
+{
+ const int top = iinfo->cli_section_count;
+ section_table_t *tables = iinfo->cli_section_tables;
+ int i;
+
+ for (i = 0; i < top; i++){
+ if ((addr >= tables->st_virtual_address) &&
+ (addr < tables->st_virtual_address + tables->st_raw_data_size)){
+ return iinfo->cli_sections [i] +
+ (addr - tables->st_virtual_address);
+ }
+ tables++;
+ }
+ return NULL;
+}
+
+/**
+ * mono_image_ensure_section_idx:
+ * @image: The image we are operating on
+ * @section: section number that we will load/map into memory
+ *
+ * This routine makes sure that we have an in-memory copy of
+ * an image section (.text, .rsrc, .data).
+ *
+ * Returns: TRUE on success
+ */
+int
+mono_image_ensure_section_idx (MonoImage *image, int section)
+{
+ cli_image_info_t *iinfo = image->image_info;
+ section_table_t *sect;
+ gboolean writable;
+
+ g_return_val_if_fail (section < iinfo->cli_section_count, FALSE);
+
+ if (iinfo->cli_sections [section] != NULL)
+ return TRUE;
+
+ sect = &iinfo->cli_section_tables [section];
+
+ writable = sect->st_flags & SECT_FLAGS_MEM_WRITE;
+
+ iinfo->cli_sections [section] = raw_buffer_load (
+ fileno (image->f), writable,
+ sect->st_raw_data_ptr, sect->st_raw_data_size);
+
+ if (iinfo->cli_sections [section] == NULL)
+ return FALSE;
+
+ return TRUE;
+}
+
+/**
+ * mono_image_ensure_section:
+ * @image: The image we are operating on
+ * @section: section name that we will load/map into memory
+ *
+ * This routine makes sure that we have an in-memory copy of
+ * an image section (.text, .rsrc, .data).
+ *
+ * Returns: TRUE on success
+ */
+int
+mono_image_ensure_section (MonoImage *image, const char *section)
+{
+ cli_image_info_t *ii = image->image_info;
+ int i;
+
+ for (i = 0; i < ii->cli_section_count; i++){
+ if (strncmp (ii->cli_section_tables [i].st_name, section, 8) != 0)
+ continue;
+
+ return mono_image_ensure_section_idx (image, i);
+ }
+ return FALSE;
+}
+
+static int
+load_section_tables (MonoImage *image, cli_image_info_t *iinfo)
+{
+ const int top = iinfo->cli_header.coff.coff_sections;
+ int i;
+
+ iinfo->cli_section_count = top;
+ iinfo->cli_section_tables = g_new0 (section_table_t, top);
+ iinfo->cli_sections = g_new0 (void *, top);
+
+ for (i = 0; i < top; i++){
+ section_table_t *t = &iinfo->cli_section_tables [i];
+
+ if (fread (t, sizeof (section_table_t), 1, image->f) != 1)
+ return FALSE;
+
+ t->st_virtual_size = le32_to_cpu (t->st_virtual_size);
+ t->st_virtual_address = le32_to_cpu (t->st_virtual_address);
+ t->st_raw_data_size = le32_to_cpu (t->st_raw_data_size);
+ t->st_raw_data_ptr = le32_to_cpu (t->st_raw_data_ptr);
+ t->st_reloc_ptr = le32_to_cpu (t->st_reloc_ptr);
+ t->st_lineno_ptr = le32_to_cpu (t->st_lineno_ptr);
+ t->st_reloc_count = le16_to_cpu (t->st_reloc_count);
+ t->st_line_count = le16_to_cpu (t->st_line_count);
+ }
+
+ for (i = 0; i < top; i++)
+ if (!mono_image_ensure_section_idx (image, i))
+ return FALSE;
+
+ return TRUE;
+}
+
+static gboolean
+load_cli_header (MonoImage *image, cli_image_info_t *iinfo)
+{
+ guint32 offset;
+ int n;
+
+ offset = cli_rva_image_map (iinfo, iinfo->cli_header.datadir.pe_cli_header.rva);
+ if (offset == INVALID_ADDRESS)
+ return FALSE;
+
+ if (fseek (image->f, offset, 0) != 0)
+ return FALSE;
+
+ if ((n = fread (&iinfo->cli_cli_header, sizeof (cli_header_t), 1, image->f)) != 1)
+ return FALSE;
+
+ /* Catch new uses of the fields that are supposed to be zero */
+
+ if ((iinfo->cli_cli_header.ch_eeinfo_table.rva != 0) ||
+ (iinfo->cli_cli_header.ch_helper_table.rva != 0) ||
+ (iinfo->cli_cli_header.ch_dynamic_info.rva != 0) ||
+ (iinfo->cli_cli_header.ch_delay_load_info.rva != 0) ||
+ (iinfo->cli_cli_header.ch_module_image.rva != 0) ||
+ (iinfo->cli_cli_header.ch_external_fixups.rva != 0) ||
+ (iinfo->cli_cli_header.ch_ridmap.rva != 0) ||
+ (iinfo->cli_cli_header.ch_debug_map.rva != 0) ||
+ (iinfo->cli_cli_header.ch_ip_map.rva != 0)){
+ g_message ("Some fields in the CLI header which should have been zero are not zero");
+ }
+
+ return TRUE;
+}
+
+static gboolean
+load_metadata_ptrs (MonoImage *image, cli_image_info_t *iinfo)
+{
+ metadata_t *metadata = &iinfo->cli_metadata;
+ guint32 offset, size;
+ guint16 streams;
+ int i;
+ char *ptr;
+
+ offset = cli_rva_image_map (iinfo, iinfo->cli_cli_header.ch_metadata.rva);
+ size = iinfo->cli_cli_header.ch_metadata.size;
+
+ metadata->raw_metadata = raw_buffer_load (fileno (image->f), FALSE, offset, size);
+ if (metadata->raw_metadata == NULL)
+ return FALSE;
+
+ ptr = metadata->raw_metadata;
+
+ if (strncmp (ptr, "BSJB", 4) == 0){
+ guint32 version_string_len;
+
+ ptr += 12;
+ version_string_len = read32 (ptr);
+ ptr += 4;
+ ptr += version_string_len;
+ if (((guint32) ptr) % 4)
+ ptr += 4 - (((guint32) ptr) %4);
+ } else
+ return FALSE;
+
+ /* skip over flags */
+ ptr += 2;
+
+ streams = read16 (ptr);
+ ptr += 2;
+
+ for (i = 0; i < streams; i++){
+ if (strncmp (ptr + 8, "#~", 3) == 0){
+ metadata->heap_tables.sh_offset = read32 (ptr);
+ metadata->heap_tables.sh_size = read32 (ptr + 4);
+ ptr += 8 + 3;
+ } else if (strncmp (ptr + 8, "#Strings", 9) == 0){
+ metadata->heap_strings.sh_offset = read32 (ptr);
+ metadata->heap_strings.sh_size = read32 (ptr + 4);
+ ptr += 8 + 9;
+ } else if (strncmp (ptr + 8, "#US", 4) == 0){
+ metadata->heap_us.sh_offset = read32 (ptr);
+ metadata->heap_us.sh_size = read32 (ptr + 4);
+ ptr += 8 + 4;
+ } else if (strncmp (ptr + 8, "#Blob", 6) == 0){
+ metadata->heap_blob.sh_offset = read32 (ptr);
+ metadata->heap_blob.sh_size = read32 (ptr + 4);
+ ptr += 8 + 6;
+ } else if (strncmp (ptr + 8, "#GUID", 6) == 0){
+ metadata->heap_guid.sh_offset = read32 (ptr);
+ metadata->heap_guid.sh_size = read32 (ptr + 4);
+ ptr += 8 + 6;
+ } else
+ g_message ("Unknown heap type: %s\n", ptr + 8);
+ if (((guint32)ptr) % 4){
+ ptr += 4 - (((guint32)ptr) % 4);
+ }
+ }
+ return TRUE;
+}
+
+/*
+ * Load representation of logical metadata tables, from the "#~" stream
+ */
+static gboolean
+load_tables (MonoImage *image, metadata_t *meta)
+{
+ char *heap_tables = meta->raw_metadata + meta->heap_tables.sh_offset;
+ guint32 *rows;
+ guint64 valid_mask;
+ int valid = 0, table;
+ int heap_sizes;
+
+ heap_sizes = heap_tables [6];
+ meta->idx_string_wide = ((heap_sizes & 0x01) == 1);
+ meta->idx_guid_wide = ((heap_sizes & 0x02) == 2);
+ meta->idx_blob_wide = ((heap_sizes & 0x04) == 4);
+
+ valid_mask = read64 (heap_tables + 8);
+ rows = (guint32 *) (heap_tables + 24);
+
+ for (table = 0; table < 64; table++){
+ if ((valid_mask & ((guint64) 1 << table)) == 0){
+ meta->tables [table].rows = 0;
+ continue;
+ }
+ if (table > 0x2b) {
+ g_warning("bits in valid must be zero above 0x2b (II - 23.1.6)");
+ }
+ meta->tables [table].rows = read32 (rows);
+ rows++;
+ valid++;
+ }
+
+ meta->tables_base = (heap_tables + 24) + (4 * valid);
+
+ /* They must be the same */
+ g_assert ((void *) meta->tables_base == (void *) rows);
+
+ mono_metadata_compute_table_bases (meta);
+ return TRUE;
+}
+
+static gboolean
+load_metadata (MonoImage *image, cli_image_info_t *iinfo)
+{
+ if (!load_metadata_ptrs (image, iinfo))
+ return FALSE;
+
+ return load_tables (image, &iinfo->cli_metadata);
+}
+
+/**
+ * mono_image_open:
+ * @fname: filename that points to the module we want to open
+ * @status: An error condition is returned in this field
+ *
+ * Retuns: An open image of type %MonoImage or NULL on error.
+ * if NULL, then check the value of @status for details on the error
+ */
+MonoImage *
+mono_image_open (const char *fname, enum MonoImageOpenStatus *status)
+{
+ cli_image_info_t *iinfo;
+ dotnet_header_t *header;
+ msdos_header_t msdos;
+ MonoImage *image;
+ int n;
+
+ image = g_new0 (MonoImage, 1);
+ image->f = fopen (fname, "r");
+ image->name = g_strdup (fname);
+ iinfo = g_new0 (cli_image_info_t, 1);
+ image->image_info = iinfo;
+
+ header = &iinfo->cli_header;
+
+ if (image->f == NULL){
+ if (status)
+ *status = MONO_IMAGE_ERROR_ERRNO;
+ mono_image_close (image);
+ return NULL;
+ }
+
+ if (status)
+ *status = MONO_IMAGE_IMAGE_INVALID;
+
+ if (fread (&msdos, sizeof (msdos), 1, image->f) != 1)
+ goto invalid_image;
+
+ if (!(msdos.msdos_header [0] == 0x4d && msdos.msdos_header [1] == 0x5a))
+ goto invalid_image;
+
+ if ((n = fread (header, sizeof (dotnet_header_t), 1, image->f)) != 1)
+ goto invalid_image;
+
+ /*
+ * FIXME: byte swap all addresses here for header.
+ */
+
+ if (!load_section_tables (image, iinfo))
+ goto invalid_image;
+
+ /* Load the CLI header */
+ if (!load_cli_header (image, iinfo))
+ goto invalid_image;
+
+ if (!load_metadata (image, iinfo))
+ goto invalid_image;
+
+ if (status)
+ *status = MONO_IMAGE_OK;
+
+ return image;
+
+invalid_image:
+ mono_image_close (image);
+ return NULL;
+}
+
+/**
+ * mono_image_close:
+ * @image: The image file we wish to close
+ *
+ * Closes an image file, deallocates all memory consumed and
+ * unmaps all possible sections of the file
+ */
+void
+mono_image_close (MonoImage *image)
+{
+ g_return_if_fail (image != NULL);
+
+ if (image->f)
+ fclose (image->f);
+
+ g_free (image->name);
+
+ if (image->image_info){
+ cli_image_info_t *ii = image->image_info;
+ int i;
+
+ if (ii->cli_metadata.raw_metadata != NULL)
+ raw_buffer_free (ii->cli_metadata.raw_metadata);
+
+ for (i = 0; i < ii->cli_section_count; i++){
+ if (!ii->cli_sections [i])
+ continue;
+ raw_buffer_free (ii->cli_sections [i]);
+ }
+ if (ii->cli_section_tables)
+ g_free (ii->cli_section_tables);
+ if (ii->cli_sections)
+ g_free (ii->cli_sections);
+ g_free (image->image_info);
+ }
+
+ g_free (image);
+}
+
+/**
+ * mono_image_strerror:
+ * @status: an code indicating the result from a recent operation
+ *
+ * Returns: a string describing the error
+ */
+const char *
+mono_image_strerror (enum MonoImageOpenStatus status)
+{
+ switch (status){
+ case MONO_IMAGE_OK:
+ return "success";
+ case MONO_IMAGE_ERROR_ERRNO:
+ return strerror (errno);
+ case MONO_IMAGE_IMAGE_INVALID:
+ return "File does not contain a valid CIL image";
+ }
+ return "Internal error";
+}
+
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