/*
  Copyright(c) 2014-2015 Intel Corporation
  All rights reserved.

  This library is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as
  published by the Free Software Foundation; either version 2.1 of
  the License, 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 Lesser General Public License for more details.

  Authors: Mengdong Lin <mengdong.lin@intel.com>
           Yao Jin <yao.jin@intel.com>
           Liam Girdwood <liam.r.girdwood@linux.intel.com>
*/

#include "list.h"
#include "tplg_local.h"
#include <ctype.h>

/* Get Private data from a file. */
static int tplg_parse_data_file(snd_config_t *cfg, struct tplg_elem *elem)
{
	struct snd_soc_tplg_private *priv = NULL;
	const char *value = NULL;
	char filename[MAX_FILE];
	char *env = getenv(ALSA_CONFIG_TPLG_VAR);
	FILE *fp;
	size_t size, bytes_read;
	int ret = 0;

	tplg_dbg("data DataFile: %s\n", elem->id);

	if (snd_config_get_string(cfg, &value) < 0)
		return -EINVAL;

	/* prepend alsa config directory to path */
	snprintf(filename, sizeof(filename), "%s/%s",
		env ? env : ALSA_TPLG_DIR, value);

	fp = fopen(filename, "r");
	if (fp == NULL) {
		SNDERR("error: invalid data file path '%s'\n",
			filename);
		ret = -errno;
		goto err;
	}

	fseek(fp, 0L, SEEK_END);
	size = ftell(fp);
	fseek(fp, 0L, SEEK_SET);
	if (size <= 0) {
		SNDERR("error: invalid data file size %zu\n", size);
		ret = -EINVAL;
		goto err;
	}
	if (size > TPLG_MAX_PRIV_SIZE) {
		SNDERR("error: data file too big %zu\n", size);
		ret = -EINVAL;
		goto err;
	}

	priv = calloc(1, sizeof(*priv) + size);
	if (!priv) {
		ret = -ENOMEM;
		goto err;
	}

	bytes_read = fread(&priv->data, 1, size, fp);
	if (bytes_read != size) {
		ret = -errno;
		goto err;
	}

	elem->data = priv;
	priv->size = size;
	elem->size = sizeof(*priv) + size;
	return 0;

err:
	if (priv)
		free(priv);
	return ret;
}

static void dump_priv_data(struct tplg_elem *elem)
{
	struct snd_soc_tplg_private *priv = elem->data;
	unsigned char *p = (unsigned char *)priv->data;
	unsigned int i, j = 0;

	tplg_dbg(" elem size = %d, priv data size = %d\n",
		elem->size, priv->size);

	for (i = 0; i < priv->size; i++) {
		if (j++ % 8 == 0)
			tplg_dbg("\n");

		tplg_dbg(" 0x%x", *p++);
	}

	tplg_dbg("\n\n");
}

/* get number of hex value elements in CSV list */
static int get_hex_num(const char *str)
{
	int commas = 0, values = 0, len = strlen(str);
	const char *end = str + len;

	/* we expect "0x0, 0x0, 0x0" */
	while (str < end) {

		/* skip white space */
		if (isspace(*str)) {
			str++;
			continue;
		}

		/* find delimeters */
		if (*str == ',') {
			commas++;
			str++;
			continue;
		}

		/* find 0x[0-9] values */
		if (*str == '0' && str + 2 <= end) {
			if (str[1] == 'x' && str[2] >= '0' && str[2] <= 'f') {
				values++;
				str += 3;
			} else {
				str++;
			}
		}

		str++;
	}

	/* there should always be one less comma than value */
	if (values -1 != commas)
		return -EINVAL;

	return values;
}

static int write_hex(char *buf, char *str, int width)
{
	long val;
	void *p = &val;

        errno = 0;
	val = strtol(str, NULL, 16);

	if ((errno == ERANGE && (val == LONG_MAX || val == LONG_MIN))
		|| (errno != 0 && val == 0)) {
		return -EINVAL;
        }

	switch (width) {
	case 1:
		*(unsigned char *)buf = *(unsigned char *)p;
		break;
	case 2:
		*(unsigned short *)buf = *(unsigned short *)p;
		break;
	case 4:
		*(unsigned int *)buf = *(unsigned int *)p;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

static int copy_data_hex(char *data, int off, const char *str, int width)
{
	char *tmp, *s = NULL, *p = data;
	int ret;

	tmp = strdup(str);
	if (tmp == NULL)
		return -ENOMEM;

	p += off;
	s = strtok(tmp, ",");

	while (s != NULL) {
		ret = write_hex(p, s, width);
		if (ret < 0) {
			free(tmp);
			return ret;
		}

		s = strtok(NULL, ",");
		p += width;
	}

	free(tmp);
	return 0;
}

static int tplg_parse_data_hex(snd_config_t *cfg, struct tplg_elem *elem,
	int width)
{
	struct snd_soc_tplg_private *priv;
	const char *value = NULL;
	int size, esize, off, num;
	int ret;

	tplg_dbg(" data: %s\n", elem->id);

	if (snd_config_get_string(cfg, &value) < 0)
		return -EINVAL;

	num = get_hex_num(value);
	if (num <= 0) {
		SNDERR("error: malformed hex variable list %s\n", value);
		return -EINVAL;
	}

	size = num * width;
	priv = elem->data;

	if (size > TPLG_MAX_PRIV_SIZE) {
		SNDERR("error: data too big %d\n", size);
		return -EINVAL;
	}

	if (priv != NULL) {
		off = priv->size;
		esize = elem->size + size;
		priv = realloc(priv, esize);
	} else {
		off = 0;
		esize = sizeof(*priv) + size;
		priv = calloc(1, esize);
	}

	if (!priv)
		return -ENOMEM;

	elem->data = priv;
	priv->size += size;
	elem->size = esize;

	ret = copy_data_hex(priv->data, off, value, width);

	dump_priv_data(elem);
	return ret;
}


/* Parse Private data.
 *
 * Object private data can either be from file or defined as bytes, shorts,
 * words.
 */
int tplg_parse_data(snd_tplg_t *tplg, snd_config_t *cfg,
	void *private ATTRIBUTE_UNUSED)
{
	snd_config_iterator_t i, next;
	snd_config_t *n;
	const char *id, *val = NULL;
	int err = 0;
	struct tplg_elem *elem;

	elem = tplg_elem_new_common(tplg, cfg, NULL, SND_TPLG_TYPE_DATA);
	if (!elem)
		return -ENOMEM;

	snd_config_for_each(i, next, cfg) {

		n = snd_config_iterator_entry(i);
		if (snd_config_get_id(n, &id) < 0) {
			continue;
		}

		if (strcmp(id, "file") == 0) {
			err = tplg_parse_data_file(n, elem);
			if (err < 0) {
				SNDERR("error: failed to parse data file\n");
				return err;
			}
			continue;
		}

		if (strcmp(id, "bytes") == 0) {
			err = tplg_parse_data_hex(n, elem, 1);
			if (err < 0) {
				SNDERR("error: failed to parse data bytes\n");
				return err;
			}
			continue;
		}

		if (strcmp(id, "shorts") == 0) {
			err = tplg_parse_data_hex(n, elem, 2);
			if (err < 0) {
				SNDERR("error: failed to parse data shorts\n");
				return err;
			}
			continue;
		}

		if (strcmp(id, "words") == 0) {
			err = tplg_parse_data_hex(n, elem, 4);
			if (err < 0) {
				SNDERR("error: failed to parse data words\n");
				return err;
			}
			continue;
		}

		if (strcmp(id, "index") == 0) {
			if (snd_config_get_string(n, &val) < 0)
				return -EINVAL;

			elem->index = atoi(val);
			tplg_dbg("\t%s: %d\n", id, elem->index);
			continue;
		}

		if (strcmp(id, "type") == 0) {
			if (snd_config_get_string(n, &val) < 0)
				return -EINVAL;

			elem->vendor_type = atoi(val);
			tplg_dbg("\t%s: %d\n", id, elem->index);
			continue;
		}
	}

	return err;
}

/* copy private data into the bytes extended control */
int tplg_copy_data(struct tplg_elem *elem, struct tplg_elem *ref)
{
	struct snd_soc_tplg_private *priv;
	int priv_data_size;

	if (!ref)
		return -EINVAL;

	tplg_dbg("Data '%s' used by '%s'\n", ref->id, elem->id);
	priv_data_size = ref->data->size;

	switch (elem->type) {
	case SND_TPLG_TYPE_MIXER:
		elem->mixer_ctrl = realloc(elem->mixer_ctrl,
			elem->size + priv_data_size);
		if (!elem->mixer_ctrl)
			return -ENOMEM;
		priv = &elem->mixer_ctrl->priv;
		break;

	case SND_TPLG_TYPE_ENUM:
		elem->enum_ctrl = realloc(elem->enum_ctrl,
			elem->size + priv_data_size);
		if (!elem->enum_ctrl)
			return -ENOMEM;
		priv = &elem->enum_ctrl->priv;
		break;

	case SND_TPLG_TYPE_BYTES:
		elem->bytes_ext = realloc(elem->bytes_ext,
			elem->size + priv_data_size);
		if (!elem->bytes_ext)
			return -ENOMEM;
		priv = &elem->bytes_ext->priv;
		break;


	case SND_TPLG_TYPE_DAPM_WIDGET:
		elem->widget = realloc(elem->widget,
			elem->size + priv_data_size);
		if (!elem->widget)
			return -ENOMEM;
		priv = &elem->widget->priv;
		break;

	default:
		SNDERR("error: elem '%s': type %d private data not supported \n",
			elem->id, elem->type);
		return -EINVAL;
	}

	elem->size += priv_data_size;
	priv->size = priv_data_size;
	ref->compound_elem = 1;
	memcpy(priv->data, ref->data->data, priv_data_size);
	return 0;
}
