Unite most info tools into just one binary
Turn this into more of an fq alternative, when used with jq. Also don't say that TIFF files are Exif.
This commit is contained in:
237
tools/info.c
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237
tools/info.c
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//
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// info.c: acquire information about JPEG/TIFF/BMFF/WebP files in JSON format
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//
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// Copyright (c) 2021 - 2023, Přemysl Eric Janouch <p@janouch.name>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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//
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#include "info.h"
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#include <jv.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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// --- ISO/IEC base media file format ------------------------------------------
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// ISO/IEC 14496-12:2015(E), used to be publicly available, now there's only:
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// https://mpeg.chiariglione.org/standards/mpeg-4/iso-base-media-file-format/text-isoiec-14496-12-5th-edition
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// but people have managed to archive the final version as well:
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// https://b.goeswhere.com/ISO_IEC_14496-12_2015.pdf
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//
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// ISO/IEC 23008-12:2017 Information technology -
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// High efficiency coding and media delivery in heterogeneous environments -
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// Part 12: Image File Format + Cor 1:2020 Technical Corrigendum 1
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// https://standards.iso.org/ittf/PubliclyAvailableStandards/
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static jv
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parse_bmff_box(jv o, const char *type, const uint8_t *data, size_t len)
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{
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// TODO(p): Parse out "uuid"'s uint8_t[16] initial field, present as hex.
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// TODO(p): Parse out "ftyp" contents: 14496-12:2015 4.3
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// TODO(p): Parse out other important boxes: 14496-12:2015 8+
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return add_to_subarray(o, "boxes", jv_string(type));
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}
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static bool
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detect_bmff(const uint8_t *p, size_t len)
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{
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// 4.2 Object Structure--this box need not be present, nor at the beginning
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// TODO(p): What does `aligned(8)` mean? It's probably in bits.
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return len >= 8 && !memcmp(p + 4, "ftyp", 4);
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}
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static jv
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parse_bmff(jv o, const uint8_t *p, size_t len)
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{
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if (!detect_bmff(p, len))
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return add_error(o, "not BMFF at all or unsupported");
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const uint8_t *end = p + len;
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while (p < end) {
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if (end - p < 8) {
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o = add_warning(o, "box framing mismatch");
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break;
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}
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char type[5] = "";
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memcpy(type, p + 4, 4);
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uint64_t box_size = u32be(p);
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const uint8_t *data = p + 8;
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if (box_size == 1) {
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if (end - p < 16) {
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o = add_warning(o, "unexpected EOF");
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break;
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}
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box_size = u64be(data);
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data += 8;
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} else if (!box_size)
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box_size = end - p;
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if (box_size > (uint64_t) (end - p)) {
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o = add_warning(o, "unexpected EOF");
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break;
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}
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size_t data_len = box_size - (data - p);
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o = parse_bmff_box(o, type, data, data_len);
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p += box_size;
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}
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return o;
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}
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// --- WebP --------------------------------------------------------------------
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// libwebp won't let us simply iterate over all chunks, so handroll it.
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//
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// https://github.com/webmproject/libwebp/blob/master/doc/webp-container-spec.txt
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// https://github.com/webmproject/libwebp/blob/master/doc/webp-lossless-bitstream-spec.txt
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// https://datatracker.ietf.org/doc/html/rfc6386
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//
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// Pretty versions, hopefully not outdated:
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// https://developers.google.com/speed/webp/docs/riff_container
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// https://developers.google.com/speed/webp/docs/webp_lossless_bitstream_specification
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static bool
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detect_webp(const uint8_t *p, size_t len)
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{
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return len >= 12 && !memcmp(p, "RIFF", 4) && !memcmp(p + 8, "WEBP", 4);
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}
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static jv
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parse_webp(jv o, const uint8_t *p, size_t len)
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{
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if (!detect_webp(p, len))
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return add_error(o, "not a WEBP file");
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// TODO(p): This can still be parseable.
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// TODO(p): Warn on trailing data.
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uint32_t size = u32le(p + 4);
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if (8 + size < len)
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return add_error(o, "truncated file");
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const uint8_t *end = p + 8 + size;
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p += 12;
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jv chunks = jv_array();
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while (p < end) {
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if (end - p < 8) {
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o = add_warning(o, "framing mismatch");
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printf("%ld", end - p);
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break;
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}
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uint32_t chunk_size = u32le(p + 4);
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uint32_t chunk_advance = (chunk_size + 1) & ~1;
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if (p + 8 + chunk_advance > end) {
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o = add_warning(o, "runaway chunk payload");
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break;
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}
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char fourcc[5] = "";
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memcpy(fourcc, p, 4);
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chunks = jv_array_append(chunks, jv_string(fourcc));
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p += 8;
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// TODO(p): Decode VP8 and VP8L chunk metadata.
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if (!strcmp(fourcc, "EXIF"))
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o = parse_exif(o, p, chunk_size);
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if (!strcmp(fourcc, "ICCP"))
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o = parse_icc(o, p, chunk_size);
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p += chunk_advance;
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}
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return jv_set(o, jv_string("chunks"), chunks);
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}
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// --- I/O ---------------------------------------------------------------------
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static struct {
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const char *name;
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bool (*detect) (const uint8_t *, size_t);
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jv (*parse) (jv, const uint8_t *, size_t);
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} formats[] = {
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{"JPEG", detect_jpeg, parse_jpeg},
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{"TIFF", detect_tiff, parse_tiff},
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{"BMFF", detect_bmff, parse_bmff},
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{"WebP", detect_webp, parse_webp},
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};
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static jv
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parse_any(jv o, const uint8_t *p, size_t len)
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{
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// TODO(p): Also see if the file extension is appropriate.
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for (size_t i = 0; i < sizeof formats / sizeof *formats; i++) {
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if (!formats[i].detect(p, len))
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continue;
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if (getenv("INFO_IDENTIFY"))
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o = jv_set(o, jv_string("format"), jv_string(formats[i].name));
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return formats[i].parse(o, p, len);
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}
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return add_error(o, "unsupported file format");
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}
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static jv
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do_file(const char *filename, jv o)
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{
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const char *err = NULL;
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FILE *fp = fopen(filename, "rb");
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if (!fp) {
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err = strerror(errno);
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goto error;
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}
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uint8_t *data = NULL, buf[256 << 10];
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size_t n, len = 0;
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while ((n = fread(buf, sizeof *buf, sizeof buf / sizeof *buf, fp))) {
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data = realloc(data, len + n);
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memcpy(data + len, buf, n);
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len += n;
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}
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if (ferror(fp)) {
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err = strerror(errno);
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goto error_read;
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}
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#if 0
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// Not sure if I want to ensure their existence...
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o = jv_object_set(o, jv_string("info"), jv_array());
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o = jv_object_set(o, jv_string("warnings"), jv_array());
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#endif
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o = parse_any(o, data, len);
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error_read:
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fclose(fp);
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free(data);
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error:
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if (err)
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o = add_error(o, err);
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return o;
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}
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int
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main(int argc, char *argv[])
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{
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// XXX: Can't use `xargs -P0`, there's a risk of non-atomic writes.
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// Usage: find . -print0 | xargs -0 ./info
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for (int i = 1; i < argc; i++) {
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const char *filename = argv[i];
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jv o = jv_object();
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o = jv_object_set(o, jv_string("filename"), jv_string(filename));
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o = do_file(filename, o);
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jv_dumpf(o, stdout, 0 /* JV_PRINT_SORTED would discard information. */);
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fputc('\n', stdout);
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}
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return 0;
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}
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