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/*
 * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
 *
 * This file is part of libass.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include "config.h"

#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <inttypes.h>
#include <strings.h>
#include <limits.h>

#include "ass_library.h"
#include "ass.h"
#include "ass_utils.h"

#if (defined(__i386__) || defined(__x86_64__)) && CONFIG_ASM

#include "x86/cpuid.h"

int has_sse2(void)
{
    uint32_t eax = 1, ebx, ecx, edx;
    ass_get_cpuid(&eax, &ebx, &ecx, &edx);
    return (!!(edx & (1 << 26)));
}

int has_avx(void)
{
    uint32_t eax = 1, ebx, ecx, edx;
    ass_get_cpuid(&eax, &ebx, &ecx, &edx);
    if(!(ecx & (1 << 27))){
        return 0;
    }
    uint32_t misc = ecx;
    eax = 0;
    ass_get_cpuid(&eax, &ebx, &ecx, &edx);
    if((ecx & (0x2 | 0x4)) != (0x2 | 0x4)){
        return 0;
    }
    return (!!(misc & (1 << 28)));
}

int has_avx2(void)
{
    uint32_t eax = 7, ebx, ecx, edx;
    ass_get_cpuid(&eax, &ebx, &ecx, &edx);
    return (!!(ebx & (1 << 5))) && has_avx();
}

#endif // ASM

void *ass_aligned_alloc(size_t alignment, size_t size)
{
    if (alignment & (alignment - 1))
        abort(); // not a power of 2
    if (size >= SIZE_MAX - alignment - sizeof(void *))
        return NULL;
    char *allocation = malloc(size + sizeof(void *) + alignment - 1);
    if (!allocation)
        return NULL;
    char *ptr = allocation + sizeof(void *);
    unsigned int misalign = (uintptr_t)ptr & (alignment - 1);
    if (misalign)
        ptr += alignment - misalign;
    *((void **)ptr - 1) = allocation;
    return ptr;
}

void ass_aligned_free(void *ptr)
{
    if (ptr)
        free(*((void **)ptr - 1));
}

void skip_spaces(char **str)
{
    char *p = *str;
    while ((*p == ' ') || (*p == '\t'))
        ++p;
    *str = p;
}

void rskip_spaces(char **str, char *limit)
{
    char *p = *str;
    while ((p > limit) && ((p[-1] == ' ') || (p[-1] == '\t')))
        --p;
    *str = p;
}

int mystrtoi(char **p, int *res)
{
    double temp_res;
    char *start = *p;
    temp_res = ass_strtod(*p, p);
    *res = (int) (temp_res + (temp_res > 0 ? 0.5 : -0.5));
    if (*p != start)
        return 1;
    else
        return 0;
}

int mystrtoll(char **p, long long *res)
{
    double temp_res;
    char *start = *p;
    temp_res = ass_strtod(*p, p);
    *res = (long long) (temp_res + (temp_res > 0 ? 0.5 : -0.5));
    if (*p != start)
        return 1;
    else
        return 0;
}

int mystrtou32(char **p, int base, uint32_t *res)
{
    char *start = *p;
    *res = strtoll(*p, p, base);
    if (*p != start)
        return 1;
    else
        return 0;
}

int mystrtod(char **p, double *res)
{
    char *start = *p;
    *res = ass_strtod(*p, p);
    if (*p != start)
        return 1;
    else
        return 0;
}

uint32_t string2color(ASS_Library *library, char *p, int hex)
{
    uint32_t color = 0;
    int base = hex ? 16 : 10;

    if (*p == '&')
        while (*p == '&')
            ++p;
    else
        ass_msg(library, MSGL_DBG2, "suspicious color format: \"%s\"\n", p);

    if (*p == 'H' || *p == 'h') {
        ++p;
        mystrtou32(&p, 16, &color);
    } else {
        mystrtou32(&p, base, &color);
    }

    while (*p == '&' || *p == 'H')
        ++p;

    {
        unsigned char *tmp = (unsigned char *) (&color);
        unsigned char b;
        b = tmp[0];
        tmp[0] = tmp[3];
        tmp[3] = b;
        b = tmp[1];
        tmp[1] = tmp[2];
        tmp[2] = b;
    }

    return color;
}

// Return a boolean value for a string
char parse_bool(char *str)
{
    skip_spaces(&str);
    if (!strncasecmp(str, "yes", 3))
        return 1;
    else if (strtol(str, NULL, 10) > 0)
        return 1;
    return 0;
}

int parse_ycbcr_matrix(char *str)
{
    skip_spaces(&str);
    if (*str == '\0')
        return YCBCR_DEFAULT;

    char *end = str + strlen(str);
    rskip_spaces(&end, str);

    // Trim a local copy of the input that we know is safe to
    // modify. The buffer is larger than any valid string + NUL,
    // so we can simply chop off the rest of the input.
    char buffer[16];
    size_t n = FFMIN(end - str, sizeof buffer - 1);
    strncpy(buffer, str, n);
    buffer[n] = '\0';

    if (!strcasecmp(buffer, "none"))
        return YCBCR_NONE;
    if (!strcasecmp(buffer, "tv.601"))
        return YCBCR_BT601_TV;
    if (!strcasecmp(buffer, "pc.601"))
        return YCBCR_BT601_PC;
    if (!strcasecmp(buffer, "tv.709"))
        return YCBCR_BT709_TV;
    if (!strcasecmp(buffer, "pc.709"))
        return YCBCR_BT709_PC;
    if (!strcasecmp(buffer, "tv.240m"))
        return YCBCR_SMPTE240M_TV;
    if (!strcasecmp(buffer, "pc.240m"))
        return YCBCR_SMPTE240M_PC;
    if (!strcasecmp(buffer, "tv.fcc"))
        return YCBCR_FCC_TV;
    if (!strcasecmp(buffer, "pc.fcc"))
        return YCBCR_FCC_PC;
    return YCBCR_UNKNOWN;
}

void ass_msg(ASS_Library *priv, int lvl, char *fmt, ...)
{
    va_list va;
    va_start(va, fmt);
    priv->msg_callback(lvl, fmt, va, priv->msg_callback_data);
    va_end(va);
}

unsigned ass_utf8_get_char(char **str)
{
    uint8_t *strp = (uint8_t *) * str;
    unsigned c = *strp++;
    unsigned mask = 0x80;
    int len = -1;
    while (c & mask) {
        mask >>= 1;
        len++;
    }
    if (len <= 0 || len > 4)
        goto no_utf8;
    c &= mask - 1;
    while ((*strp & 0xc0) == 0x80) {
        if (len-- <= 0)
            goto no_utf8;
        c = (c << 6) | (*strp++ & 0x3f);
    }
    if (len)
        goto no_utf8;
    *str = (char *) strp;
    return c;

  no_utf8:
    strp = (uint8_t *) * str;
    c = *strp++;
    *str = (char *) strp;
    return c;
}

/**
 * Original version from http://www.cprogramming.com/tutorial/utf8.c
 * \brief Converts a single UTF-32 code point to UTF-8
 * \param dest Buffer to write to. Writes a NULL terminator.
 * \param ch 32-bit character code to convert
 * \return number of bytes written
 * converts a single character and ASSUMES YOU HAVE ENOUGH SPACE
 */
unsigned ass_utf8_put_char(char *dest, uint32_t ch)
{
    char *orig_dest = dest;

    if (ch < 0x80) {
        *dest++ = (char)ch;
    } else if (ch < 0x800) {
        *dest++ = (ch >> 6) | 0xC0;
        *dest++ = (ch & 0x3F) | 0x80;
    } else if (ch < 0x10000) {
        *dest++ = (ch >> 12) | 0xE0;
        *dest++ = ((ch >> 6) & 0x3F) | 0x80;
        *dest++ = (ch & 0x3F) | 0x80;
    } else if (ch < 0x110000) {
        *dest++ = (ch >> 18) | 0xF0;
        *dest++ = ((ch >> 12) & 0x3F) | 0x80;
        *dest++ = ((ch >> 6) & 0x3F) | 0x80;
        *dest++ = (ch & 0x3F) | 0x80;
    }

    *dest = '\0';
    return dest - orig_dest;
}

/**
 * \brief find style by name
 * \param track track
 * \param name style name
 * \return index in track->styles
 * Returns 0 if no styles found => expects at least 1 style.
 * Parsing code always adds "Default" style in the beginning.
 */
int lookup_style(ASS_Track *track, char *name)
{
    int i;
    // '*' seem to mean literally nothing;
    // VSFilter removes them as soon as it can
    while (*name == '*')
        ++name;
    // VSFilter then normalizes the case of "Default"
    // (only in contexts where this function is called)
    if (strcasecmp(name, "Default") == 0)
        name = "Default";
    for (i = track->n_styles - 1; i >= 0; --i) {
        if (strcmp(track->styles[i].Name, name) == 0)
            return i;
    }
    i = track->default_style;
    ass_msg(track->library, MSGL_WARN,
            "[%p]: Warning: no style named '%s' found, using '%s'",
            track, name, track->styles[i].Name);
    return i;
}

/**
 * \brief find style by name as in \r
 * \param track track
 * \param name style name
 * \param len style name length
 * \return style in track->styles
 * Returns NULL if no style has the given name.
 */
ASS_Style *lookup_style_strict(ASS_Track *track, char *name, size_t len)
{
    int i;
    for (i = track->n_styles - 1; i >= 0; --i) {
        if (strncmp(track->styles[i].Name, name, len) == 0 &&
            track->styles[i].Name[len] == '\0')
            return track->styles + i;
    }
    ass_msg(track->library, MSGL_WARN,
            "[%p]: Warning: no style named '%.*s' found",
            track, (int) len, name);
    return NULL;
}

#ifdef CONFIG_ENCA
void *ass_guess_buffer_cp(ASS_Library *library, unsigned char *buffer,
                          int buflen, char *preferred_language,
                          char *fallback)
{
    const char **languages;
    size_t langcnt;
    EncaAnalyser analyser;
    EncaEncoding encoding;
    char *detected_sub_cp = NULL;
    int i;

    languages = enca_get_languages(&langcnt);
    ass_msg(library, MSGL_V, "ENCA supported languages");
    for (i = 0; i < langcnt; i++) {
        ass_msg(library, MSGL_V, "lang %s", languages[i]);
    }

    for (i = 0; i < langcnt; i++) {
        const char *tmp;

        if (strcasecmp(languages[i], preferred_language) != 0)
            continue;
        analyser = enca_analyser_alloc(languages[i]);
        encoding = enca_analyse_const(analyser, buffer, buflen);
        tmp = enca_charset_name(encoding.charset, ENCA_NAME_STYLE_ICONV);
        if (tmp && encoding.charset != ENCA_CS_UNKNOWN) {
            detected_sub_cp = strdup(tmp);
            ass_msg(library, MSGL_INFO, "ENCA detected charset: %s", tmp);
        }
        enca_analyser_free(analyser);
    }

    free(languages);

    if (!detected_sub_cp) {
        detected_sub_cp = strdup(fallback);
        ass_msg(library, MSGL_INFO,
               "ENCA detection failed: fallback to %s", fallback);
    }

    return detected_sub_cp;
}
#endif