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sukhanov |
/****************************************************************************/
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/* */
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/* Module: jamcrc.c */
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/* */
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/* Copyright (C) Altera Corporation 1997 */
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/* */
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/* Description: Functions to calculate Cyclic Redundancy Check codes */
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/* */
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/****************************************************************************/
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/****************************************************************************/
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/* */
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/* Actel version 1.1 May 2003 */
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/* */
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/****************************************************************************/
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#include "jamexprt.h"
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#include "jamdefs.h"
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#include "jamexec.h"
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#include "jamutil.h"
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/****************************************************************************/
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/* */
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void jam_crc_init(unsigned short *shift_register)
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/* */
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/* Description: This function initializes CRC shift register. It must */
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/* be called before jam_crc_update(). */
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/* */
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/* Returns: Nothing */
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/* */
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/****************************************************************************/
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{
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*shift_register = 0xffff; /* start with all ones in shift reg */
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}
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/****************************************************************************/
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/* */
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void jam_crc_update
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(
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unsigned short *shift_register,
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int data
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)
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/* */
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/* Description: This function updates crc shift register by shifting */
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/* in the new data bits. Must be called for each bytes in */
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/* the order that they appear in the data stream. */
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/* */
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/* Returns: Nothing */
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/* */
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/****************************************************************************/
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{
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int bit, feedback;
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unsigned short shift_register_copy;
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shift_register_copy = *shift_register; /* copy it to local variable */
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for (bit = 0; bit < 8; bit++) /* compute for each bit */
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{
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feedback = (data ^ shift_register_copy) & 0x01;
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shift_register_copy >>= 1; /* shift the shift register */
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if (feedback)
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{
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shift_register_copy ^= 0x8408; /* invert selected bits */
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}
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data >>= 1; /* get the next bit of input_byte */
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}
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*shift_register = shift_register_copy;
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}
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/****************************************************************************/
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/* */
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unsigned short jam_get_crc_value(unsigned short *shift_register)
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/* */
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/* Description: The content of the shift_register is the CRC of all */
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/* bytes passed to jam_crc_update() since the last call */
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/* to jam_crc_init(). */
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/* */
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/* Returns: CRC value from shift register. */
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/* */
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/***************************************************************************/
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{
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/* CRC is complement of shift register */
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return((unsigned short)~(*shift_register));
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}
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int jam_hexchar(int ch)
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{
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int value;
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if (jam_isdigit((char) ch)) value = (ch - '0');
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else value = (jam_toupper((char) ch) - 'A') + 10;
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return (value);
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}
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/****************************************************************************/
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/* */
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JAM_RETURN_TYPE jam_check_crc
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(
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char *program,
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long program_size,
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unsigned short *expected_crc,
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unsigned short *actual_crc
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)
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/* */
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/* Description: This function reads the entire input stream and */
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/* computes the CRC of everything up to the CRC statement */
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/* itself (and the preceding new-line, if applicable). */
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/* Carriage return characters (0x0d) which are followed */
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/* by new-line characters (0x0a) are ignored, so the CRC */
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/* will not change when the file is converted from MS-DOS */
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/* text format (with CR-LF) to UNIX text format (only LF) */
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/* and visa-versa. */
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/* */
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/* Returns: JAMC_SUCCESS for success, else appropriate error code */
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/* */
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/****************************************************************************/
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{
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BOOL comment = FALSE;
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BOOL quoted_string = FALSE;
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BOOL in_statement = FALSE;
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BOOL in_instruction = FALSE;
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BOOL found_expected_crc = FALSE;
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int ch = 0;
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long position = 0L;
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long left_quote_position = -1L;
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unsigned short crc_shift_register = 0;
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unsigned short crc_shift_register_backup[4] = {0};
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int ch_queue[4] = {0};
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unsigned short tmp_expected_crc = 0;
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unsigned short tmp_actual_crc = 0;
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JAM_RETURN_TYPE status = JAMC_SUCCESS;
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jam_program = program;
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jam_program_size = program_size;
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status = jam_seek(0);
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jam_crc_init(&crc_shift_register);
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while ((status == JAMC_SUCCESS) && (!found_expected_crc))
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{
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ch = jam_getc();
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if ((ch != EOF) && (ch != JAMC_RETURN_CHAR))
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{
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jam_crc_update(&crc_shift_register, ch);
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if ((!comment) && (!quoted_string))
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{
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if (ch == JAMC_COMMENT_CHAR)
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{
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/* beginning of comment */
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comment = TRUE;
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}
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else if (ch == JAMC_QUOTE_CHAR)
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{
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/* beginning of quoted string */
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quoted_string = TRUE;
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left_quote_position = position;
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}
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}
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/*
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* Check if this is the CRC statement
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*/
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if ((!comment) && (!quoted_string) &&
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in_statement && in_instruction &&
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(jam_isspace((char) ch_queue[3])) &&
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(ch_queue[2] == 'C') &&
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(ch_queue[1] == 'R') &&
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(ch_queue[0] == 'C') &&
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(jam_isspace((char) ch)))
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{
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status = JAMC_SYNTAX_ERROR;
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crc_shift_register = crc_shift_register_backup[3];
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/* skip over any additional white space */
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do { ch = jam_getc(); } while
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((ch != EOF) && (jam_isspace((char) ch)));
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if (jam_is_hex_char((char) ch))
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{
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/* get remaining three characters of CRC */
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ch_queue[2] = jam_getc();
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ch_queue[1] = jam_getc();
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ch_queue[0] = jam_getc();
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if ((jam_is_hex_char((char) ch_queue[2])) &&
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(jam_is_hex_char((char) ch_queue[1])) &&
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(jam_is_hex_char((char) ch_queue[0])))
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{
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tmp_expected_crc = (unsigned short)
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((jam_hexchar(ch) << 12) |
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(jam_hexchar(ch_queue[2]) << 8) |
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(jam_hexchar(ch_queue[1]) << 4) |
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jam_hexchar(ch_queue[0]));
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/* skip over any additional white space */
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do { ch = jam_getc(); } while
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((ch != EOF) && (jam_isspace((char) ch)));
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if (ch == JAMC_SEMICOLON_CHAR)
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{
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status = JAMC_SUCCESS;
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found_expected_crc = TRUE;
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}
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}
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}
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}
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/* check if we are reading the instruction name */
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if ((!comment) && (!quoted_string) && (!in_statement) &&
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(jam_is_name_char((char) ch)))
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{
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in_statement = TRUE;
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in_instruction = TRUE;
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}
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/* check if we are finished reading the instruction name */
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if ((!comment) && (!quoted_string) && in_statement &&
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in_instruction && (!jam_is_name_char((char) ch)))
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{
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in_instruction = FALSE;
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}
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if ((!comment) && (!quoted_string) && in_statement &&
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(ch == JAMC_SEMICOLON_CHAR))
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{
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/* end of statement */
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in_statement = FALSE;
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}
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if (comment &&
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((ch == JAMC_NEWLINE_CHAR) || (ch == JAMC_RETURN_CHAR)))
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{
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/* end of comment */
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comment = FALSE;
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}
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else if (quoted_string && (ch == JAMC_QUOTE_CHAR) &&
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(position > left_quote_position))
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{
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/* end of quoted string */
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quoted_string = FALSE;
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}
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}
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if (ch == EOF)
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{
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/* end of file */
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status = JAMC_UNEXPECTED_END;
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}
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++position; /* position of next character to be read */
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if (ch != JAMC_RETURN_CHAR)
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{
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ch_queue[3] = ch_queue[2];
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ch_queue[2] = ch_queue[1];
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ch_queue[1] = ch_queue[0];
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ch_queue[0] = ch;
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crc_shift_register_backup[3] = crc_shift_register_backup[2];
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crc_shift_register_backup[2] = crc_shift_register_backup[1];
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crc_shift_register_backup[1] = crc_shift_register_backup[0];
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crc_shift_register_backup[0] = crc_shift_register;
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}
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}
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tmp_actual_crc = jam_get_crc_value(&crc_shift_register);
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if (found_expected_crc && (expected_crc != NULL))
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{
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*expected_crc = tmp_expected_crc;
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}
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if (actual_crc != NULL)
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{
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*actual_crc = tmp_actual_crc;
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}
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if (found_expected_crc && (status == JAMC_SUCCESS) &&
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(tmp_expected_crc != tmp_actual_crc))
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{
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status = JAMC_CRC_ERROR;
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}
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return (status);
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}
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