mirror of
https://github.com/FFmpeg/FFmpeg.git
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281 lines
7.5 KiB
C
281 lines
7.5 KiB
C
/*
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* TIFF Common Routines
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* Copyright (c) 2013 Thilo Borgmann <thilo.borgmann _at_ mail.de>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* TIFF Common Routines
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* @author Thilo Borgmann <thilo.borgmann _at_ mail.de>
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*/
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#include "libavutil/bprint.h"
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#include "tiff_common.h"
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int ff_tis_ifd(unsigned tag)
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{
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int i;
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for (i = 0; i < FF_ARRAY_ELEMS(ifd_tags); i++) {
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if (ifd_tags[i] == tag) {
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return i + 1;
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}
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}
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return 0;
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}
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unsigned ff_tget_short(GetByteContext *gb, int le)
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{
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return le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
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}
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unsigned ff_tget_long(GetByteContext *gb, int le)
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{
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return le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
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}
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double ff_tget_double(GetByteContext *gb, int le)
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{
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av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)};
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return i.f64;
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}
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unsigned ff_tget(GetByteContext *gb, int type, int le)
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{
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switch (type) {
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case TIFF_BYTE: return bytestream2_get_byte(gb);
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case TIFF_SHORT: return ff_tget_short(gb, le);
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case TIFF_LONG: return ff_tget_long(gb, le);
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default: return UINT_MAX;
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}
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}
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static const char *auto_sep(int count, const char *sep, int i, int columns)
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{
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if (sep)
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return i ? sep : "";
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if (i && i%columns) {
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return ", ";
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} else
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return columns < count ? "\n" : "";
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}
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static int bprint_to_avdict(AVBPrint *bp, const char *name,
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AVDictionary **metadata)
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{
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char *ap;
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int ret;
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if (!av_bprint_is_complete(bp)) {
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av_bprint_finalize(bp, NULL);
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return AVERROR(ENOMEM);
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}
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if ((ret = av_bprint_finalize(bp, &ap)) < 0)
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return ret;
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return av_dict_set(metadata, name, ap, AV_DICT_DONT_STRDUP_VAL);
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}
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int ff_tadd_rational_metadata(int count, const char *name, const char *sep,
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GetByteContext *gb, int le, AVDictionary **metadata)
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{
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AVBPrint bp;
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int32_t nom, denom;
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int i;
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if (count >= INT_MAX / sizeof(int64_t) || count <= 0)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(gb) < count * sizeof(int64_t))
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return AVERROR_INVALIDDATA;
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av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED);
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for (i = 0; i < count; i++) {
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nom = ff_tget_long(gb, le);
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denom = ff_tget_long(gb, le);
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av_bprintf(&bp, "%s%7"PRId32":%-7"PRId32, auto_sep(count, sep, i, 4), nom, denom);
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}
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return bprint_to_avdict(&bp, name, metadata);
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}
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int ff_tadd_long_metadata(int count, const char *name, const char *sep,
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GetByteContext *gb, int le, AVDictionary **metadata)
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{
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AVBPrint bp;
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int i;
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if (count >= INT_MAX / sizeof(int32_t) || count <= 0)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(gb) < count * sizeof(int32_t))
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return AVERROR_INVALIDDATA;
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av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED);
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for (i = 0; i < count; i++) {
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av_bprintf(&bp, "%s%7i", auto_sep(count, sep, i, 8), ff_tget_long(gb, le));
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}
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return bprint_to_avdict(&bp, name, metadata);
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}
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int ff_tadd_doubles_metadata(int count, const char *name, const char *sep,
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GetByteContext *gb, int le, AVDictionary **metadata)
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{
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AVBPrint bp;
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int i;
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if (count >= INT_MAX / sizeof(int64_t) || count <= 0)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(gb) < count * sizeof(int64_t))
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return AVERROR_INVALIDDATA;
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av_bprint_init(&bp, 10 * count, 100 * count);
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for (i = 0; i < count; i++) {
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av_bprintf(&bp, "%s%.15g", auto_sep(count, sep, i, 4), ff_tget_double(gb, le));
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}
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return bprint_to_avdict(&bp, name, metadata);
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}
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int ff_tadd_shorts_metadata(int count, const char *name, const char *sep,
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GetByteContext *gb, int le, int is_signed, AVDictionary **metadata)
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{
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AVBPrint bp;
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int i;
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if (count >= INT_MAX / sizeof(int16_t) || count <= 0)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(gb) < count * sizeof(int16_t))
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return AVERROR_INVALIDDATA;
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av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED);
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for (i = 0; i < count; i++) {
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int v = is_signed ? (int16_t)ff_tget_short(gb, le) : ff_tget_short(gb, le);
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av_bprintf(&bp, "%s%5i", auto_sep(count, sep, i, 8), v);
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}
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return bprint_to_avdict(&bp, name, metadata);
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}
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int ff_tadd_bytes_metadata(int count, const char *name, const char *sep,
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GetByteContext *gb, int le, int is_signed, AVDictionary **metadata)
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{
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AVBPrint bp;
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int i;
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if (count >= INT_MAX / sizeof(int8_t) || count < 0)
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return AVERROR_INVALIDDATA;
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if (bytestream2_get_bytes_left(gb) < count * sizeof(int8_t))
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return AVERROR_INVALIDDATA;
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av_bprint_init(&bp, 10 * count, AV_BPRINT_SIZE_UNLIMITED);
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for (i = 0; i < count; i++) {
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int v = is_signed ? (int8_t)bytestream2_get_byte(gb) : bytestream2_get_byte(gb);
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av_bprintf(&bp, "%s%3i", auto_sep(count, sep, i, 16), v);
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}
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return bprint_to_avdict(&bp, name, metadata);
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}
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int ff_tadd_string_metadata(int count, const char *name,
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GetByteContext *gb, int le, AVDictionary **metadata)
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{
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char *value;
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if (bytestream2_get_bytes_left(gb) < count || count < 0)
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return AVERROR_INVALIDDATA;
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value = av_malloc(count + 1);
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if (!value)
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return AVERROR(ENOMEM);
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bytestream2_get_bufferu(gb, value, count);
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value[count] = 0;
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av_dict_set(metadata, name, value, AV_DICT_DONT_STRDUP_VAL);
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return 0;
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}
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int ff_tdecode_header(GetByteContext *gb, int *le, int *ifd_offset)
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{
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if (bytestream2_get_bytes_left(gb) < 8) {
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return AVERROR_INVALIDDATA;
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}
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*le = bytestream2_get_le16u(gb);
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if (*le == AV_RB16("II")) {
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*le = 1;
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} else if (*le == AV_RB16("MM")) {
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*le = 0;
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} else {
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return AVERROR_INVALIDDATA;
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}
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if (ff_tget_short(gb, *le) != 42) {
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return AVERROR_INVALIDDATA;
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}
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*ifd_offset = ff_tget_long(gb, *le);
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return 0;
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}
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int ff_tread_tag(GetByteContext *gb, int le, unsigned *tag, unsigned *type,
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unsigned *count, int *next)
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{
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int ifd_tag;
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int valid_type;
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*tag = ff_tget_short(gb, le);
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*type = ff_tget_short(gb, le);
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*count = ff_tget_long (gb, le);
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ifd_tag = ff_tis_ifd(*tag);
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valid_type = *type != 0 && *type < FF_ARRAY_ELEMS(type_sizes);
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*next = bytestream2_tell(gb) + 4;
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// check for valid type
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if (!valid_type) {
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return AVERROR_INVALIDDATA;
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}
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// seek to offset if this is an IFD-tag or
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// if count values do not fit into the offset value
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if (ifd_tag || (*count > 4 || !(type_sizes[*type] * (*count) <= 4 || *type == TIFF_STRING))) {
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bytestream2_seek(gb, ff_tget_long (gb, le), SEEK_SET);
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}
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return 0;
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}
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