/* * Copyright © 2018, VideoLAN and dav1d authors * Copyright © 2018, Two Orioles, LLC * Copyright © 2019, James Almer <jamrial@gmail.com> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this *    list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, *    this list of conditions and the following disclaimer in the documentation *    and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef DAV1D_INPUT_PARSE_H#define DAV1D_INPUT_PARSE_H #include <limits.h> #include "dav1d/headers.h" static int leb128(FILE *const f, size_t *const len) {    uint64_t val = 0;    unsigned i = 0, more;    do {        uint8_t v;        if (fread(&v, 1, 1, f) < 1)            return -1;        more = v & 0x80;        val |= ((uint64_t) (v & 0x7F)) << (i * 7);        i++;    } while (more && i < 8);    if (val > UINT_MAX || more)        return -1;    *len = (size_t) val;    return i;} // these functions are based on an implementation from FFmpeg, and relicensed// with author's permission static int leb(const uint8_t *ptr, int sz, size_t *const len) {    uint64_t val = 0;    unsigned i = 0, more;    do {        if (!sz--) return -1;        const int v = *ptr++;        more = v & 0x80;        val |= ((uint64_t) (v & 0x7F)) << (i * 7);        i++;    } while (more && i < 8);    if (val > UINT_MAX || more)        return -1;    *len = (size_t) val;    return i;} static inline int parse_obu_header(const uint8_t *buf, int buf_size,                                   size_t *const obu_size,                                   enum Dav1dObuType *const type,                                   const int allow_implicit_size){    int ret, extension_flag, has_size_flag;     if (!buf_size)        return -1;    if (*buf & 0x80) // obu_forbidden_bit        return -1;     *type = (*buf & 0x78) >> 3;    extension_flag = (*buf & 0x4) >> 2;    has_size_flag  = (*buf & 0x2) >> 1;    // ignore obu_reserved_1bit    buf++;    buf_size--;     if (extension_flag) {        buf++;        buf_size--;        // ignore fields    }     if (has_size_flag) {        ret = leb(buf, buf_size, obu_size);        if (ret < 0)            return -1;        return (int) *obu_size + ret + 1 + extension_flag;    } else if (!allow_implicit_size)        return -1;     *obu_size = buf_size;    return buf_size + 1 + extension_flag;} #endif /* DAV1D_INPUT_PARSE_H */