/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2005.
 *
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 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
 *  General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *                                                                   USA
 */

#include "dtc.h"

void data_free(struct data d)
{
        struct marker *m, *nm;

        m = d.markers;
        while (m) {
                nm = m->next;
                free(m->ref);
                free(m);
                m = nm;
        }

        if (d.val)
                free(d.val);
}

struct data data_grow_for(struct data d, int xlen)
{
        struct data nd;
        int newsize;

        if (xlen == 0)
                return d;

        nd = d;

        newsize = xlen;

        while ((d.len + xlen) > newsize)
                newsize *= 2;

        nd.val = xrealloc(d.val, newsize);

        return nd;
}

struct data data_copy_mem(const char *mem, int len)
{
        struct data d;

        d = data_grow_for(empty_data, len);

        d.len = len;
        memcpy(d.val, mem, len);

        return d;
}

static char get_oct_char(const char *s, int *i)
{
        char x[4];
        char *endx;
        long val;

        x[3] = '\0';
        strncpy(x, s + *i, 3);

        val = strtol(x, &endx, 8);

        assert(endx > x);

        (*i) += endx - x;
        return val;
}

static char get_hex_char(const char *s, int *i)
{
        char x[3];
        char *endx;
        long val;

        x[2] = '\0';
        strncpy(x, s + *i, 2);

        val = strtol(x, &endx, 16);
        if (!(endx  > x))
                die("\\x used with no following hex digits\n");

        (*i) += endx - x;
        return val;
}

struct data data_copy_escape_string(const char *s, int len)
{
        int i = 0;
        struct data d;
        char *q;

        d = data_grow_for(empty_data, strlen(s)+1);

        q = d.val;
        while (i < len) {
                char c = s[i++];

                if (c != '\\') {
                        q[d.len++] = c;
                        continue;
                }

                c = s[i++];
                assert(c);
                switch (c) {
                case 'a':
                        q[d.len++] = '\a';
                        break;
                case 'b':
                        q[d.len++] = '\b';
                        break;
                case 't':
                        q[d.len++] = '\t';
                        break;
                case 'n':
                        q[d.len++] = '\n';
                        break;
                case 'v':
                        q[d.len++] = '\v';
                        break;
                case 'f':
                        q[d.len++] = '\f';
                        break;
                case 'r':
                        q[d.len++] = '\r';
                        break;
                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                        i--; /* need to re-read the first digit as
                              * part of the octal value */
                        q[d.len++] = get_oct_char(s, &i);
                        break;
                case 'x':
                        q[d.len++] = get_hex_char(s, &i);
                        break;
                default:
                        q[d.len++] = c;
                }
        }

        q[d.len++] = '\0';
        return d;
}

struct data data_copy_file(FILE *f, size_t maxlen)
{
        struct data d = empty_data;

        while (!feof(f) && (d.len < maxlen)) {
                size_t chunksize, ret;

                if (maxlen == -1)
                        chunksize = 4096;
                else
                        chunksize = maxlen - d.len;

                d = data_grow_for(d, chunksize);
                ret = fread(d.val + d.len, 1, chunksize, f);

                if (ferror(f))
                        die("Error reading file into data: %s", strerror(errno));

                if (d.len + ret < d.len)
                        die("Overflow reading file into data\n");

                d.len += ret;
        }

        return d;
}

struct data data_append_data(struct data d, const void *p, int len)
{
        d = data_grow_for(d, len);
        memcpy(d.val + d.len, p, len);
        d.len += len;
        return d;
}

struct data data_insert_at_marker(struct data d, struct marker *m,
                                  const void *p, int len)
{
        d = data_grow_for(d, len);
        memmove(d.val + m->offset + len, d.val + m->offset, d.len - m->offset);
        memcpy(d.val + m->offset, p, len);
        d.len += len;

        /* Adjust all markers after the one we're inserting at */
        m = m->next;
        for_each_marker(m)
                m->offset += len;
        return d;
}

static struct data data_append_markers(struct data d, struct marker *m)
{
        struct marker **mp = &d.markers;

        /* Find the end of the markerlist */
        while (*mp)
                mp = &((*mp)->next);
        *mp = m;
        return d;
}

struct data data_merge(struct data d1, struct data d2)
{
        struct data d;
        struct marker *m2 = d2.markers;

        d = data_append_markers(data_append_data(d1, d2.val, d2.len), m2);

        /* Adjust for the length of d1 */
        for_each_marker(m2)
                m2->offset += d1.len;

        d2.markers = NULL; /* So data_free() doesn't clobber them */
        data_free(d2);

        return d;
}

struct data data_append_cell(struct data d, cell_t word)
{
        cell_t beword = cpu_to_fdt32(word);

        return data_append_data(d, &beword, sizeof(beword));
}

struct data data_append_re(struct data d, const struct fdt_reserve_entry *re)
{
        struct fdt_reserve_entry bere;

        bere.address = cpu_to_fdt64(re->address);
        bere.size = cpu_to_fdt64(re->size);

        return data_append_data(d, &bere, sizeof(bere));
}

struct data data_append_addr(struct data d, uint64_t addr)
{
        uint64_t beaddr = cpu_to_fdt64(addr);

        return data_append_data(d, &beaddr, sizeof(beaddr));
}

struct data data_append_byte(struct data d, uint8_t byte)
{
        return data_append_data(d, &byte, 1);
}

struct data data_append_zeroes(struct data d, int len)
{
        d = data_grow_for(d, len);

        memset(d.val + d.len, 0, len);
        d.len += len;
        return d;
}

struct data data_append_align(struct data d, int align)
{
        int newlen = ALIGN(d.len, align);
        return data_append_zeroes(d, newlen - d.len);
}

struct data data_add_marker(struct data d, enum markertype type, char *ref)
{
        struct marker *m;

        m = xmalloc(sizeof(*m));
        m->offset = d.len;
        m->type = type;
        m->ref = ref;
        m->next = NULL;

        return data_append_markers(d, m);
}

int data_is_one_string(struct data d)
{
        int i;
        int len = d.len;

        if (len == 0)
                return 0;

        for (i = 0; i < len-1; i++)
                if (d.val[i] == '\0')
                        return 0;

        if (d.val[len-1] != '\0')
                return 0;

        return 1;
}