/**
 * @file op_fileio.c
 * Reading from / writing to files
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon
 * @author Philippe Elie
 */

#include <unistd.h>

#include "op_fileio.h"

#include "op_libiberty.h"

#include <errno.h>
#include <string.h>
#include <stdlib.h>

static FILE * op_do_open_file(char const * name, char const * mode, int fatal)
{
	FILE * fp;

	fp = fopen(name, mode);

	if (!fp) {
		if (fatal) {
			fprintf(stderr,"oprofiled:op_do_open_file: %s: %s",
				name, strerror(errno));
			exit(EXIT_FAILURE);
		}
	}

	return fp;
}


FILE * op_try_open_file(char const * name, char const * mode)
{
	return op_do_open_file(name, mode, 0);
}


FILE * op_open_file(char const * name, char const * mode)
{
	return op_do_open_file(name, mode, 1);
}


void op_close_file(FILE * fp)
{
	if (fclose(fp))
		perror("oprofiled:op_close_file: ");
}


void op_write_file(FILE * fp, void const * buf, size_t size)
{
	size_t written;

	if (size == 0)
		return;

	written = fwrite(buf, size, 1, fp);

	if (written != 1) {
		fprintf(stderr,
			"oprofiled:op_write_file: wrote less than expected: %lu bytes.\n",
			(unsigned long)size);
		exit(EXIT_FAILURE);
	}
}


void op_write_u8(FILE * fp, u8 val)
{
	op_write_file(fp, &val, sizeof(val));
}


void op_write_u32(FILE * fp, u32 val)
{
	op_write_file(fp, &val, sizeof(val));
}


void op_write_u64(FILE * fp, u64 val)
{
	op_write_file(fp, &val, sizeof(val));
}

unsigned long op_read_long_from_file(char const * filename, int fatal)
{
	FILE * fp;
	unsigned long value;

	fp = fopen(filename, "r");
	if (fp == NULL) {
		if (!fatal)
			return (unsigned long)-1;
		fprintf(stderr,
			"op_read_long_from_file: Failed to open %s, reason %s\n",
			filename, strerror(errno));
		exit(EXIT_FAILURE);
	}

	if (fscanf(fp, "%lu", &value) != 1) {
		fclose(fp);
		if (!fatal)
			return (unsigned long)-1;
		fprintf(stderr,
			"op_read_long_from_file: Failed to convert contents of file %s to unsigned long\n",
			filename);
		exit(EXIT_FAILURE);
	}

	fclose(fp);

	return value;
}


u32 op_read_int_from_file(char const * filename, int fatal)
{
	FILE * fp;
	u32 value;

	fp = fopen(filename, "r");
	if (fp == NULL) {
		if (!fatal)
			return (u32)-1;
		fprintf(stderr,
			"op_read_int_from_file: Failed to open %s, reason %s\n",
			filename, strerror(errno));
		exit(EXIT_FAILURE);
	}

	if (fscanf(fp, "%u", &value) != 1) {
		fclose(fp);
		if (!fatal)
			return (u32)-1;
		fprintf(stderr,
			"op_read_int_from_file: Failed to convert contents of file %s to integer\n",
			filename);
		exit(EXIT_FAILURE);
	}

	fclose(fp);

	return value;
}


char * op_get_line(FILE * fp)
{
	char * buf;
	char * cp;
	int c;
	size_t max = 512;

	buf = xmalloc(max);
	cp = buf;

	while (1) {
		switch (c = getc(fp)) {
			case EOF:
				free(buf);
				return NULL;
				break;

			case '\n':
			case '\0':
				*cp = '\0';
				return buf;
				break;

			default:
				*cp = (char)c;
				cp++;
				if (((size_t)(cp - buf)) == max) {
					buf = xrealloc(buf, max + 128);
					cp = buf + max;
					max += 128;
				}
				break;
		}
	}
}


/* FIXME the debug info stuff should be handled by binutils */
unsigned long
calc_crc32(unsigned long crc, unsigned char * buf, size_t len)
{
	static const unsigned long crc32_table[256] =
	{
		0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
		0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
		0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
		0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
		0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
		0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
		0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
		0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
		0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
		0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
		0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
		0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
		0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
 		0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
		0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
		0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
		0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
		0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
		0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
		0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
		0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
		0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
		0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
		0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
		0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
		0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
		0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
		0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
		0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
		0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
		0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
		0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
		0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
		0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
		0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
		0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
		0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
		0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
		0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
		0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
		0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
		0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
		0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
		0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
		0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
		0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
		0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
		0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
		0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
		0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
		0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
		0x2d02ef8d
	};
	unsigned char * end;

	crc = ~crc & 0xffffffff;
	for (end = buf + len; buf < end; ++buf)
		crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8);
	return ~crc & 0xffffffff;
}