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  1. /*******************************************************************************
  2.  *
  3.  * Module Name: utfileio - simple file I/O routines
  4.  *
  5.  ******************************************************************************/
  6.  
  7. /*
  8.  * Copyright (C) 2000 - 2015, Intel Corp.
  9.  * All rights reserved.
  10.  *
  11.  * Redistribution and use in source and binary forms, with or without
  12.  * modification, are permitted provided that the following conditions
  13.  * are met:
  14.  * 1. Redistributions of source code must retain the above copyright
  15.  *    notice, this list of conditions, and the following disclaimer,
  16.  *    without modification.
  17.  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18.  *    substantially similar to the "NO WARRANTY" disclaimer below
  19.  *    ("Disclaimer") and any redistribution must be conditioned upon
  20.  *    including a substantially similar Disclaimer requirement for further
  21.  *    binary redistribution.
  22.  * 3. Neither the names of the above-listed copyright holders nor the names
  23.  *    of any contributors may be used to endorse or promote products derived
  24.  *    from this software without specific prior written permission.
  25.  *
  26.  * Alternatively, this software may be distributed under the terms of the
  27.  * GNU General Public License ("GPL") version 2 as published by the Free
  28.  * Software Foundation.
  29.  *
  30.  * NO WARRANTY
  31.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32.  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33.  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34.  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35.  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36.  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37.  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38.  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39.  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40.  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41.  * POSSIBILITY OF SUCH DAMAGES.
  42.  */
  43.  
  44. #include <acpi/acpi.h>
  45. #include "accommon.h"
  46. #include "actables.h"
  47. #include "acapps.h"
  48. #include "errno.h"
  49.  
  50. #ifdef ACPI_ASL_COMPILER
  51. #include "aslcompiler.h"
  52. #endif
  53.  
  54. #define _COMPONENT          ACPI_CA_DEBUGGER
  55. ACPI_MODULE_NAME("utfileio")
  56.  
  57. #ifdef ACPI_APPLICATION
  58. /* Local prototypes */
  59. static acpi_status
  60. acpi_ut_check_text_mode_corruption(u8 *table,
  61.                                    u32 table_length, u32 file_length);
  62.  
  63. static acpi_status
  64. acpi_ut_read_table(FILE * fp,
  65.                    struct acpi_table_header **table, u32 *table_length);
  66.  
  67. /*******************************************************************************
  68.  *
  69.  * FUNCTION:    acpi_ut_check_text_mode_corruption
  70.  *
  71.  * PARAMETERS:  table           - Table buffer
  72.  *              table_length    - Length of table from the table header
  73.  *              file_length     - Length of the file that contains the table
  74.  *
  75.  * RETURN:      Status
  76.  *
  77.  * DESCRIPTION: Check table for text mode file corruption where all linefeed
  78.  *              characters (LF) have been replaced by carriage return linefeed
  79.  *              pairs (CR/LF).
  80.  *
  81.  ******************************************************************************/
  82.  
  83. static acpi_status
  84. acpi_ut_check_text_mode_corruption(u8 *table, u32 table_length, u32 file_length)
  85. {
  86.         u32 i;
  87.         u32 pairs = 0;
  88.  
  89.         if (table_length != file_length) {
  90.                 ACPI_WARNING((AE_INFO,
  91.                               "File length (0x%X) is not the same as the table length (0x%X)",
  92.                               file_length, table_length));
  93.         }
  94.  
  95.         /* Scan entire table to determine if each LF has been prefixed with a CR */
  96.  
  97.         for (i = 1; i < file_length; i++) {
  98.                 if (table[i] == 0x0A) {
  99.                         if (table[i - 1] != 0x0D) {
  100.  
  101.                                 /* The LF does not have a preceding CR, table not corrupted */
  102.  
  103.                                 return (AE_OK);
  104.                         } else {
  105.                                 /* Found a CR/LF pair */
  106.  
  107.                                 pairs++;
  108.                         }
  109.                         i++;
  110.                 }
  111.         }
  112.  
  113.         if (!pairs) {
  114.                 return (AE_OK);
  115.         }
  116.  
  117.         /*
  118.          * Entire table scanned, each CR is part of a CR/LF pair --
  119.          * meaning that the table was treated as a text file somewhere.
  120.          *
  121.          * NOTE: We can't "fix" the table, because any existing CR/LF pairs in the
  122.          * original table are left untouched by the text conversion process --
  123.          * meaning that we cannot simply replace CR/LF pairs with LFs.
  124.          */
  125.         acpi_os_printf("Table has been corrupted by text mode conversion\n");
  126.         acpi_os_printf("All LFs (%u) were changed to CR/LF pairs\n", pairs);
  127.         acpi_os_printf("Table cannot be repaired!\n");
  128.         return (AE_BAD_VALUE);
  129. }
  130.  
  131. /*******************************************************************************
  132.  *
  133.  * FUNCTION:    acpi_ut_read_table
  134.  *
  135.  * PARAMETERS:  fp              - File that contains table
  136.  *              table           - Return value, buffer with table
  137.  *              table_length    - Return value, length of table
  138.  *
  139.  * RETURN:      Status
  140.  *
  141.  * DESCRIPTION: Load the DSDT from the file pointer
  142.  *
  143.  ******************************************************************************/
  144.  
  145. static acpi_status
  146. acpi_ut_read_table(FILE * fp,
  147.                    struct acpi_table_header **table, u32 *table_length)
  148. {
  149.         struct acpi_table_header table_header;
  150.         u32 actual;
  151.         acpi_status status;
  152.         u32 file_size;
  153.         u8 standard_header = TRUE;
  154.         s32 count;
  155.  
  156.         /* Get the file size */
  157.  
  158.         file_size = cm_get_file_size(fp);
  159.         if (file_size == ACPI_UINT32_MAX) {
  160.                 return (AE_ERROR);
  161.         }
  162.  
  163.         if (file_size < 4) {
  164.                 return (AE_BAD_HEADER);
  165.         }
  166.  
  167.         /* Read the signature */
  168.  
  169.         fseek(fp, 0, SEEK_SET);
  170.  
  171.         count = fread(&table_header, 1, sizeof(struct acpi_table_header), fp);
  172.         if (count != sizeof(struct acpi_table_header)) {
  173.                 acpi_os_printf("Could not read the table header\n");
  174.                 return (AE_BAD_HEADER);
  175.         }
  176.  
  177.         /* The RSDP table does not have standard ACPI header */
  178.  
  179.         if (ACPI_VALIDATE_RSDP_SIG(table_header.signature)) {
  180.                 *table_length = file_size;
  181.                 standard_header = FALSE;
  182.         } else {
  183.  
  184. #if 0
  185.                 /* Validate the table header/length */
  186.  
  187.                 status = acpi_tb_validate_table_header(&table_header);
  188.                 if (ACPI_FAILURE(status)) {
  189.                         acpi_os_printf("Table header is invalid!\n");
  190.                         return (status);
  191.                 }
  192. #endif
  193.  
  194.                 /* File size must be at least as long as the Header-specified length */
  195.  
  196.                 if (table_header.length > file_size) {
  197.                         acpi_os_printf
  198.                             ("TableHeader length [0x%X] greater than the input file size [0x%X]\n",
  199.                              table_header.length, file_size);
  200.  
  201. #ifdef ACPI_ASL_COMPILER
  202.                         acpi_os_printf("File is corrupt or is ASCII text -- "
  203.                                        "it must be a binary file\n");
  204. #endif
  205.                         return (AE_BAD_HEADER);
  206.                 }
  207. #ifdef ACPI_OBSOLETE_CODE
  208.                 /* We only support a limited number of table types */
  209.  
  210.                 if (!ACPI_COMPARE_NAME
  211.                     ((char *)table_header.signature, ACPI_SIG_DSDT)
  212.                     && !ACPI_COMPARE_NAME((char *)table_header.signature,
  213.                                           ACPI_SIG_PSDT)
  214.                     && !ACPI_COMPARE_NAME((char *)table_header.signature,
  215.                                           ACPI_SIG_SSDT)) {
  216.                         acpi_os_printf
  217.                             ("Table signature [%4.4s] is invalid or not supported\n",
  218.                              (char *)table_header.signature);
  219.                         ACPI_DUMP_BUFFER(&table_header,
  220.                                          sizeof(struct acpi_table_header));
  221.                         return (AE_ERROR);
  222.                 }
  223. #endif
  224.  
  225.                 *table_length = table_header.length;
  226.         }
  227.  
  228.         /* Allocate a buffer for the table */
  229.  
  230.         *table = acpi_os_allocate((size_t) file_size);
  231.         if (!*table) {
  232.                 acpi_os_printf
  233.                     ("Could not allocate memory for ACPI table %4.4s (size=0x%X)\n",
  234.                      table_header.signature, *table_length);
  235.                 return (AE_NO_MEMORY);
  236.         }
  237.  
  238.         /* Get the rest of the table */
  239.  
  240.         fseek(fp, 0, SEEK_SET);
  241.         actual = fread(*table, 1, (size_t) file_size, fp);
  242.         if (actual == file_size) {
  243.                 if (standard_header) {
  244.  
  245.                         /* Now validate the checksum */
  246.  
  247.                         status = acpi_tb_verify_checksum((void *)*table,
  248.                                                          ACPI_CAST_PTR(struct
  249.                                                                        acpi_table_header,
  250.                                                                        *table)->
  251.                                                          length);
  252.  
  253.                         if (status == AE_BAD_CHECKSUM) {
  254.                                 status =
  255.                                     acpi_ut_check_text_mode_corruption((u8 *)
  256.                                                                        *table,
  257.                                                                        file_size,
  258.                                                                        (*table)->
  259.                                                                        length);
  260.                                 return (status);
  261.                         }
  262.                 }
  263.                 return (AE_OK);
  264.         }
  265.  
  266.         if (actual > 0) {
  267.                 acpi_os_printf("Warning - reading table, asked for %X got %X\n",
  268.                                file_size, actual);
  269.                 return (AE_OK);
  270.         }
  271.  
  272.         acpi_os_printf("Error - could not read the table file\n");
  273.         acpi_os_free(*table);
  274.         *table = NULL;
  275.         *table_length = 0;
  276.         return (AE_ERROR);
  277. }
  278.  
  279. /*******************************************************************************
  280.  *
  281.  * FUNCTION:    acpi_ut_read_table_from_file
  282.  *
  283.  * PARAMETERS:  filename         - File where table is located
  284.  *              table            - Where a pointer to the table is returned
  285.  *
  286.  * RETURN:      Status
  287.  *
  288.  * DESCRIPTION: Get an ACPI table from a file
  289.  *
  290.  ******************************************************************************/
  291.  
  292. acpi_status
  293. acpi_ut_read_table_from_file(char *filename, struct acpi_table_header ** table)
  294. {
  295.         FILE *file;
  296.         u32 file_size;
  297.         u32 table_length;
  298.         acpi_status status = AE_ERROR;
  299.  
  300.         /* Open the file, get current size */
  301.  
  302.         file = fopen(filename, "rb");
  303.         if (!file) {
  304.                 perror("Could not open input file");
  305.  
  306.                 if (errno == ENOENT) {
  307.                         return (AE_NOT_EXIST);
  308.                 }
  309.  
  310.                 return (status);
  311.         }
  312.  
  313.         file_size = cm_get_file_size(file);
  314.         if (file_size == ACPI_UINT32_MAX) {
  315.                 goto exit;
  316.         }
  317.  
  318.         /* Get the entire file */
  319.  
  320.         fprintf(stderr,
  321.                 "Reading ACPI table from file %12s - Length %.8u (0x%06X)\n",
  322.                 filename, file_size, file_size);
  323.  
  324.         status = acpi_ut_read_table(file, table, &table_length);
  325.         if (ACPI_FAILURE(status)) {
  326.                 acpi_os_printf("Could not get table from the file\n");
  327.         }
  328.  
  329. exit:
  330.         fclose(file);
  331.         return (status);
  332. }
  333.  
  334. #endif
  335.