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libwebp/examples/webpinfo.c

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// Copyright 2017 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// Command-line tool to print out the chunk level structure of WebP files
// along with basic integrity checks.
//
// Author: Hui Su (huisu@google.com)
#include <assert.h>
#include <stdio.h>
#ifdef HAVE_CONFIG_H
#include "webp/config.h"
#endif
#include "../imageio/imageio_util.h"
#include "webp/decode.h"
#include "webp/format_constants.h"
#include "webp/mux_types.h"
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif
#define LOG_ERROR(MESSAGE) \
do { \
if (webp_info->show_diagnosis_) { \
fprintf(stderr, "Error: %s\n", MESSAGE); \
} \
} while (0)
#define LOG_WARN(MESSAGE) \
do { \
if (webp_info->show_diagnosis_) { \
fprintf(stderr, "Warning: %s\n", MESSAGE); \
} \
} while (0)
static const char* const kFormats[3] = {
"Unknown",
"Lossy",
"Lossless"
};
static const char* const kLosslessTransforms[4] = {
"Predictor",
"Cross Color",
"Subtract Green",
"Color Indexing"
};
static const char* const kAlphaFilterMethods[4] = {
"None",
"Horizontal",
"Vertical",
"Gradient"
};
typedef enum {
WEBP_INFO_OK = 0,
WEBP_INFO_TRUNCATED_DATA,
WEBP_INFO_PARSE_ERROR,
WEBP_INFO_INVALID_PARAM,
WEBP_INFO_BITSTREAM_ERROR,
WEBP_INFO_MISSING_DATA,
WEBP_INFO_INVALID_COMMAND
} WebPInfoStatus;
typedef enum ChunkID {
CHUNK_VP8,
CHUNK_VP8L,
CHUNK_VP8X,
CHUNK_ALPHA,
CHUNK_ANIM,
CHUNK_ANMF,
CHUNK_ICCP,
CHUNK_EXIF,
CHUNK_XMP,
CHUNK_UNKNOWN,
CHUNK_TYPES = CHUNK_UNKNOWN
} ChunkID;
typedef struct {
size_t start_;
size_t end_;
const uint8_t* buf_;
} MemBuffer;
typedef struct {
size_t offset_;
size_t size_;
const uint8_t* payload_;
ChunkID id_;
} ChunkData;
typedef struct WebPInfo {
int canvas_width_;
int canvas_height_;
int loop_count_;
int num_frames_;
int chunk_counts_[CHUNK_TYPES];
int anmf_subchunk_counts_[3]; // 0 VP8; 1 VP8L; 2 ALPH.
uint32_t bgcolor_;
int feature_flags_;
int has_alpha_;
// Used for parsing ANMF chunks.
int frame_width_, frame_height_;
size_t anim_frame_data_size_;
int is_processing_anim_frame_, seen_alpha_subchunk_, seen_image_subchunk_;
// Print output control.
int quiet_, show_diagnosis_, show_summary_;
int parse_bitstream_;
} WebPInfo;
static void WebPInfoInit(WebPInfo* const webp_info) {
memset(webp_info, 0, sizeof(*webp_info));
}
static const char kWebPChunkTags[CHUNK_TYPES][4] = {
{ 'V', 'P', '8', ' ' },
{ 'V', 'P', '8', 'L' },
{ 'V', 'P', '8', 'X' },
{ 'A', 'L', 'P', 'H' },
{ 'A', 'N', 'I', 'M' },
{ 'A', 'N', 'M', 'F' },
{ 'I', 'C', 'C', 'P' },
{ 'E', 'X', 'I', 'F' },
{ 'X', 'M', 'P', ' ' },
};
// -----------------------------------------------------------------------------
// Data reading.
static int GetLE16(const uint8_t* const data) {
return (data[0] << 0) | (data[1] << 8);
}
static int GetLE24(const uint8_t* const data) {
return GetLE16(data) | (data[2] << 16);
}
static uint32_t GetLE32(const uint8_t* const data) {
return GetLE16(data) | ((uint32_t)GetLE16(data + 2) << 16);
}
static int ReadLE16(const uint8_t** data) {
const int val = GetLE16(*data);
*data += 2;
return val;
}
static int ReadLE24(const uint8_t** data) {
const int val = GetLE24(*data);
*data += 3;
return val;
}
static uint32_t ReadLE32(const uint8_t** data) {
const uint32_t val = GetLE32(*data);
*data += 4;
return val;
}
static int ReadFileToWebPData(const char* const filename,
WebPData* const webp_data) {
const uint8_t* data;
size_t size;
if (!ImgIoUtilReadFile(filename, &data, &size)) return 0;
webp_data->bytes = data;
webp_data->size = size;
return 1;
}
// -----------------------------------------------------------------------------
// MemBuffer object.
static void InitMemBuffer(MemBuffer* const mem, const WebPData* webp_data) {
mem->buf_ = webp_data->bytes;
mem->start_ = 0;
mem->end_ = webp_data->size;
}
static size_t MemDataSize(const MemBuffer* const mem) {
return (mem->end_ - mem->start_);
}
static const uint8_t* GetBuffer(MemBuffer* const mem) {
return mem->buf_ + mem->start_;
}
static void Skip(MemBuffer* const mem, size_t size) {
mem->start_ += size;
}
static uint32_t ReadMemBufLE32(MemBuffer* const mem) {
const uint8_t* const data = mem->buf_ + mem->start_;
const uint32_t val = GetLE32(data);
assert(MemDataSize(mem) >= 4);
Skip(mem, 4);
return val;
}
// -----------------------------------------------------------------------------
// Lossy bitstream analysis.
static int GetBits(const uint8_t* const data, size_t data_size, size_t nb,
int* val, uint64_t* const bit_pos) {
*val = 0;
while (nb-- > 0) {
const uint64_t p = (*bit_pos)++;
if ((p >> 3) >= data_size) {
return 0;
} else {
const int bit = !!(data[p >> 3] & (128 >> ((p & 7))));
*val = (*val << 1) | bit;
}
}
return 1;
}
static int GetSignedBits(const uint8_t* const data, size_t data_size, size_t nb,
int* val, uint64_t* const bit_pos) {
int sign;
if (!GetBits(data, data_size, nb, val, bit_pos)) return 0;
if (!GetBits(data, data_size, 1, &sign, bit_pos)) return 0;
if (sign) *val = -(*val);
return 1;
}
#define GET_BITS(v, n) \
do { \
if (!GetBits(data, data_size, n, &(v), bit_pos)) { \
LOG_ERROR("Truncated lossy bitstream."); \
return WEBP_INFO_TRUNCATED_DATA; \
} \
} while (0)
#define GET_SIGNED_BITS(v, n) \
do { \
if (!GetSignedBits(data, data_size, n, &(v), bit_pos)) { \
LOG_ERROR("Truncated lossy bitstream."); \
return WEBP_INFO_TRUNCATED_DATA; \
} \
} while (0)
static WebPInfoStatus ParseLossySegmentHeader(const WebPInfo* const webp_info,
const uint8_t* const data,
size_t data_size,
uint64_t* const bit_pos) {
int use_segment;
GET_BITS(use_segment, 1);
printf(" Use segment: %d\n", use_segment);
if (use_segment) {
int update_map, update_data;
GET_BITS(update_map, 1);
GET_BITS(update_data, 1);
printf(" Update map: %d\n"
" Update data: %d\n",
update_map, update_data);
if (update_data) {
int i, a_delta;
int quantizer[4] = {0, 0, 0, 0};
int filter_strength[4] = {0, 0, 0, 0};
GET_BITS(a_delta, 1);
printf(" Absolute delta: %d\n", a_delta);
for (i = 0; i < 4; ++i) {
int bit;
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(quantizer[i], 7);
}
for (i = 0; i < 4; ++i) {
int bit;
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(filter_strength[i], 6);
}
printf(" Quantizer: %d %d %d %d\n", quantizer[0], quantizer[1],
quantizer[2], quantizer[3]);
printf(" Filter strength: %d %d %d %d\n", filter_strength[0],
filter_strength[1], filter_strength[2], filter_strength[3]);
}
if (update_map) {
int i;
int prob_segment[3] = {255, 255, 255};
for (i = 0; i < 3; ++i) {
int bit;
GET_BITS(bit, 1);
if (bit) GET_BITS(prob_segment[i], 8);
}
printf(" Prob segment: %d %d %d\n",
prob_segment[0], prob_segment[1], prob_segment[2]);
}
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ParseLossyFilterHeader(const WebPInfo* const webp_info,
const uint8_t* const data,
size_t data_size,
uint64_t* const bit_pos) {
int simple_filter, level, sharpness, use_lf_delta;
GET_BITS(simple_filter, 1);
GET_BITS(level, 6);
GET_BITS(sharpness, 3);
GET_BITS(use_lf_delta, 1);
printf(" Simple filter: %d\n", simple_filter);
printf(" Level: %d\n", level);
printf(" Sharpness: %d\n", sharpness);
printf(" Use lf delta: %d\n", use_lf_delta);
if (use_lf_delta) {
int update;
GET_BITS(update, 1);
printf(" Update lf delta: %d\n", update);
if (update) {
int i;
for (i = 0; i < 4 + 4; ++i) {
int temp;
GET_BITS(temp, 1);
if (temp) GET_BITS(temp, 7);
}
}
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ParseLossyHeader(const ChunkData* const chunk_data,
const WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_;
size_t data_size = chunk_data->size_ - CHUNK_HEADER_SIZE;
const uint32_t bits = (uint32_t)data[0] | (data[1] << 8) | (data[2] << 16);
const int key_frame = !(bits & 1);
const int profile = (bits >> 1) & 7;
const int display = (bits >> 4) & 1;
const uint32_t partition0_length = (bits >> 5);
WebPInfoStatus status = WEBP_INFO_OK;
uint64_t bit_position = 0;
uint64_t* const bit_pos = &bit_position;
int color_space, clamp_type;
printf(" Parsing lossy bitstream...\n");
// Calling WebPGetFeatures() in ProcessImageChunk() should ensure this.
assert(chunk_data->size_ >= CHUNK_HEADER_SIZE + 10);
if (profile > 3) {
LOG_ERROR("Unknown profile.");
return WEBP_INFO_BITSTREAM_ERROR;
}
if (!display) {
LOG_ERROR("Frame is not displayable.");
return WEBP_INFO_BITSTREAM_ERROR;
}
data += 3;
data_size -= 3;
printf(" Key frame: %s\n"
" Profile: %d\n"
" Display: %s\n"
" Part. 0 length: %d\n",
key_frame ? "Yes" : "No", profile,
display ? "Yes" : "No", partition0_length);
if (key_frame) {
if (!(data[0] == 0x9d && data[1] == 0x01 && data[2] == 0x2a)) {
LOG_ERROR("Invalid lossy bitstream signature.");
return WEBP_INFO_BITSTREAM_ERROR;
}
printf(" Width: %d\n"
" X scale: %d\n"
" Height: %d\n"
" Y scale: %d\n",
((data[4] << 8) | data[3]) & 0x3fff, data[4] >> 6,
((data[6] << 8) | data[5]) & 0x3fff, data[6] >> 6);
data += 7;
data_size -= 7;
} else {
LOG_ERROR("Non-keyframe detected in lossy bitstream.");
return WEBP_INFO_BITSTREAM_ERROR;
}
if (partition0_length >= data_size) {
LOG_ERROR("Bad partition length.");
return WEBP_INFO_BITSTREAM_ERROR;
}
GET_BITS(color_space, 1);
GET_BITS(clamp_type, 1);
printf(" Color space: %d\n", color_space);
printf(" Clamp type: %d\n", clamp_type);
status = ParseLossySegmentHeader(webp_info, data, data_size, bit_pos);
if (status != WEBP_INFO_OK) return status;
status = ParseLossyFilterHeader(webp_info, data, data_size, bit_pos);
if (status != WEBP_INFO_OK) return status;
{ // Partition number and size.
const uint8_t* part_size = data + partition0_length;
int num_parts, i;
size_t part_data_size;
GET_BITS(num_parts, 2);
num_parts = 1 << num_parts;
if ((int)(data_size - partition0_length) < (num_parts - 1) * 3) {
LOG_ERROR("Truncated lossy bitstream.");
return WEBP_INFO_TRUNCATED_DATA;
}
part_data_size = data_size - partition0_length - (num_parts - 1) * 3;
printf(" Total partitions: %d\n", num_parts);
for (i = 1; i < num_parts; ++i) {
const size_t psize =
part_size[0] | (part_size[1] << 8) | (part_size[2] << 16);
if (psize > part_data_size) {
LOG_ERROR("Truncated partition.");
return WEBP_INFO_TRUNCATED_DATA;
}
printf(" Part. %d length: %d\n", i, (int)psize);
part_data_size -= psize;
part_size += 3;
}
}
// Quantizer.
{
int base_q, bit;
int dq_y1_dc = 0, dq_y2_dc = 0, dq_y2_ac = 0, dq_uv_dc = 0, dq_uv_ac = 0;
GET_BITS(base_q, 7);
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(dq_y1_dc, 4);
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(dq_y2_dc, 4);
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(dq_y2_ac, 4);
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(dq_uv_dc, 4);
GET_BITS(bit, 1);
if (bit) GET_SIGNED_BITS(dq_uv_ac, 4);
printf(" Base Q: %d\n", base_q);
printf(" DQ Y1 DC: %d\n", dq_y1_dc);
printf(" DQ Y2 DC: %d\n", dq_y2_dc);
printf(" DQ Y2 AC: %d\n", dq_y2_ac);
printf(" DQ UV DC: %d\n", dq_uv_dc);
printf(" DQ UV AC: %d\n", dq_uv_ac);
}
if ((*bit_pos >> 3) >= partition0_length) {
LOG_ERROR("Truncated lossy bitstream.");
return WEBP_INFO_TRUNCATED_DATA;
}
return WEBP_INFO_OK;
}
// -----------------------------------------------------------------------------
// Lossless bitstream analysis.
static int LLGetBits(const uint8_t* const data, size_t data_size, size_t nb,
int* val, uint64_t* const bit_pos) {
uint32_t i = 0;
*val = 0;
while (i < nb) {
const uint64_t p = (*bit_pos)++;
if ((p >> 3) >= data_size) {
return 0;
} else {
const int bit = !!(data[p >> 3] & (1 << ((p & 7))));
*val = *val | (bit << i);
++i;
}
}
return 1;
}
#define LL_GET_BITS(v, n) \
do { \
if (!LLGetBits(data, data_size, n, &(v), bit_pos)) { \
LOG_ERROR("Truncated lossless bitstream."); \
return WEBP_INFO_TRUNCATED_DATA; \
} \
} while (0)
static WebPInfoStatus ParseLosslessTransform(WebPInfo* const webp_info,
const uint8_t* const data,
size_t data_size,
uint64_t* const bit_pos) {
int use_transform, block_size, n_colors;
LL_GET_BITS(use_transform, 1);
printf(" Use transform: %s\n", use_transform ? "Yes" : "No");
if (use_transform) {
int type;
LL_GET_BITS(type, 2);
printf(" 1st transform: %s (%d)\n", kLosslessTransforms[type], type);
switch (type) {
case PREDICTOR_TRANSFORM:
case CROSS_COLOR_TRANSFORM:
LL_GET_BITS(block_size, 3);
block_size = 1 << (block_size + 2);
printf(" Tran. block size: %d\n", block_size);
break;
case COLOR_INDEXING_TRANSFORM:
LL_GET_BITS(n_colors, 8);
n_colors += 1;
printf(" No. of colors: %d\n", n_colors);
break;
default: break;
}
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ParseLosslessHeader(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_;
size_t data_size = chunk_data->size_ - CHUNK_HEADER_SIZE;
uint64_t bit_position = 0;
uint64_t* const bit_pos = &bit_position;
WebPInfoStatus status;
printf(" Parsing lossless bitstream...\n");
if (data_size < VP8L_FRAME_HEADER_SIZE) {
LOG_ERROR("Truncated lossless bitstream.");
return WEBP_INFO_TRUNCATED_DATA;
}
if (data[0] != VP8L_MAGIC_BYTE) {
LOG_ERROR("Invalid lossless bitstream signature.");
return WEBP_INFO_BITSTREAM_ERROR;
}
data += 1;
data_size -= 1;
{
int width, height, has_alpha, version;
LL_GET_BITS(width, 14);
LL_GET_BITS(height, 14);
LL_GET_BITS(has_alpha, 1);
LL_GET_BITS(version, 3);
width += 1;
height += 1;
printf(" Width: %d\n", width);
printf(" Height: %d\n", height);
printf(" Alpha: %d\n", has_alpha);
printf(" Version: %d\n", version);
}
status = ParseLosslessTransform(webp_info, data, data_size, bit_pos);
if (status != WEBP_INFO_OK) return status;
return WEBP_INFO_OK;
}
static WebPInfoStatus ParseAlphaHeader(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_;
size_t data_size = chunk_data->size_ - CHUNK_HEADER_SIZE;
if (data_size <= ALPHA_HEADER_LEN) {
LOG_ERROR("Truncated ALPH chunk.");
return WEBP_INFO_TRUNCATED_DATA;
}
printf(" Parsing ALPH chunk...\n");
{
const int compression_method = (data[0] >> 0) & 0x03;
const int filter = (data[0] >> 2) & 0x03;
const int pre_processing = (data[0] >> 4) & 0x03;
const int reserved_bits = (data[0] >> 6) & 0x03;
printf(" Compression: %d\n", compression_method);
printf(" Filter: %s (%d)\n",
kAlphaFilterMethods[filter], filter);
printf(" Pre-processing: %d\n", pre_processing);
if (compression_method > ALPHA_LOSSLESS_COMPRESSION) {
LOG_ERROR("Invalid Alpha compression method.");
return WEBP_INFO_BITSTREAM_ERROR;
}
if (pre_processing > ALPHA_PREPROCESSED_LEVELS) {
LOG_ERROR("Invalid Alpha pre-processing method.");
return WEBP_INFO_BITSTREAM_ERROR;
}
if (reserved_bits != 0) {
LOG_WARN("Reserved bits in ALPH chunk header are not all 0.");
}
data += ALPHA_HEADER_LEN;
data_size -= ALPHA_HEADER_LEN;
if (compression_method == ALPHA_LOSSLESS_COMPRESSION) {
uint64_t bit_pos = 0;
WebPInfoStatus status =
ParseLosslessTransform(webp_info, data, data_size, &bit_pos);
if (status != WEBP_INFO_OK) return status;
}
}
return WEBP_INFO_OK;
}
// -----------------------------------------------------------------------------
// Chunk parsing.
static WebPInfoStatus ParseRIFFHeader(const WebPInfo* const webp_info,
MemBuffer* const mem) {
const size_t min_size = RIFF_HEADER_SIZE + CHUNK_HEADER_SIZE;
size_t riff_size;
if (MemDataSize(mem) < min_size) {
LOG_ERROR("Truncated data detected when parsing RIFF header.");
return WEBP_INFO_TRUNCATED_DATA;
}
if (memcmp(GetBuffer(mem), "RIFF", CHUNK_SIZE_BYTES) ||
memcmp(GetBuffer(mem) + CHUNK_HEADER_SIZE, "WEBP", CHUNK_SIZE_BYTES)) {
LOG_ERROR("Corrupted RIFF header.");
return WEBP_INFO_PARSE_ERROR;
}
riff_size = GetLE32(GetBuffer(mem) + TAG_SIZE);
if (riff_size < CHUNK_HEADER_SIZE) {
LOG_ERROR("RIFF size is too small.");
return WEBP_INFO_PARSE_ERROR;
}
if (riff_size > MAX_CHUNK_PAYLOAD) {
LOG_ERROR("RIFF size is over limit.");
return WEBP_INFO_PARSE_ERROR;
}
riff_size += CHUNK_HEADER_SIZE;
if (!webp_info->quiet_) {
printf("RIFF HEADER:\n");
printf(" File size: %6d\n", (int)riff_size);
}
if (riff_size < mem->end_) {
LOG_WARN("RIFF size is smaller than the file size.");
mem->end_ = riff_size;
} else if (riff_size > mem->end_) {
LOG_ERROR("Truncated data detected when parsing RIFF payload.");
return WEBP_INFO_TRUNCATED_DATA;
}
Skip(mem, RIFF_HEADER_SIZE);
return WEBP_INFO_OK;
}
static WebPInfoStatus ParseChunk(const WebPInfo* const webp_info,
MemBuffer* const mem,
ChunkData* const chunk_data) {
memset(chunk_data, 0, sizeof(*chunk_data));
if (MemDataSize(mem) < CHUNK_HEADER_SIZE) {
LOG_ERROR("Truncated data detected when parsing chunk header.");
return WEBP_INFO_TRUNCATED_DATA;
} else {
const size_t chunk_start_offset = mem->start_;
const uint32_t fourcc = ReadMemBufLE32(mem);
const uint32_t payload_size = ReadMemBufLE32(mem);
const uint32_t payload_size_padded = payload_size + (payload_size & 1);
const size_t chunk_size = CHUNK_HEADER_SIZE + payload_size_padded;
int i;
if (payload_size > MAX_CHUNK_PAYLOAD) {
LOG_ERROR("Size of chunk payload is over limit.");
return WEBP_INFO_INVALID_PARAM;
}
if (payload_size_padded > MemDataSize(mem)){
LOG_ERROR("Truncated data detected when parsing chunk payload.");
return WEBP_INFO_TRUNCATED_DATA;
}
for (i = 0; i < CHUNK_TYPES; ++i) {
if (!memcmp(kWebPChunkTags[i], &fourcc, TAG_SIZE)) break;
}
chunk_data->offset_ = chunk_start_offset;
chunk_data->size_ = chunk_size;
chunk_data->id_ = (ChunkID)i;
chunk_data->payload_ = GetBuffer(mem);
if (chunk_data->id_ == CHUNK_ANMF) {
if (payload_size != payload_size_padded) {
LOG_ERROR("ANMF chunk size should always be even.");
return WEBP_INFO_PARSE_ERROR;
}
// There are sub-chunks to be parsed in an ANMF chunk.
Skip(mem, ANMF_CHUNK_SIZE);
} else {
Skip(mem, payload_size_padded);
}
return WEBP_INFO_OK;
}
}
// -----------------------------------------------------------------------------
// Chunk analysis.
static WebPInfoStatus ProcessVP8XChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_;
if (webp_info->chunk_counts_[CHUNK_VP8] ||
webp_info->chunk_counts_[CHUNK_VP8L] ||
webp_info->chunk_counts_[CHUNK_VP8X]) {
LOG_ERROR("Already seen a VP8/VP8L/VP8X chunk when parsing VP8X chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (chunk_data->size_ != VP8X_CHUNK_SIZE + CHUNK_HEADER_SIZE) {
LOG_ERROR("Corrupted VP8X chunk.");
return WEBP_INFO_PARSE_ERROR;
}
++webp_info->chunk_counts_[CHUNK_VP8X];
webp_info->feature_flags_ = *data;
data += 4;
webp_info->canvas_width_ = 1 + ReadLE24(&data);
webp_info->canvas_height_ = 1 + ReadLE24(&data);
if (!webp_info->quiet_) {
printf(" ICCP: %d\n Alpha: %d\n EXIF: %d\n XMP: %d\n Animation: %d\n",
(webp_info->feature_flags_ & ICCP_FLAG) != 0,
(webp_info->feature_flags_ & ALPHA_FLAG) != 0,
(webp_info->feature_flags_ & EXIF_FLAG) != 0,
(webp_info->feature_flags_ & XMP_FLAG) != 0,
(webp_info->feature_flags_ & ANIMATION_FLAG) != 0);
printf(" Canvas size %d x %d\n",
webp_info->canvas_width_, webp_info->canvas_height_);
}
if (webp_info->canvas_width_ > MAX_CANVAS_SIZE) {
LOG_WARN("Canvas width is out of range in VP8X chunk.");
}
if (webp_info->canvas_height_ > MAX_CANVAS_SIZE) {
LOG_WARN("Canvas height is out of range in VP8X chunk.");
}
if ((uint64_t)webp_info->canvas_width_ * webp_info->canvas_height_ >
MAX_IMAGE_AREA) {
LOG_WARN("Canvas area is out of range in VP8X chunk.");
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ProcessANIMChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_;
if (!webp_info->chunk_counts_[CHUNK_VP8X]) {
LOG_ERROR("ANIM chunk detected before VP8X chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (chunk_data->size_ != ANIM_CHUNK_SIZE + CHUNK_HEADER_SIZE) {
LOG_ERROR("Corrupted ANIM chunk.");
return WEBP_INFO_PARSE_ERROR;
}
webp_info->bgcolor_ = ReadLE32(&data);
webp_info->loop_count_ = ReadLE16(&data);
++webp_info->chunk_counts_[CHUNK_ANIM];
if (!webp_info->quiet_) {
printf(" Background color:(ARGB) %02x %02x %02x %02x\n",
(webp_info->bgcolor_ >> 24) & 0xff,
(webp_info->bgcolor_ >> 16) & 0xff,
(webp_info->bgcolor_ >> 8) & 0xff,
webp_info->bgcolor_ & 0xff);
printf(" Loop count : %d\n", webp_info->loop_count_);
}
if (webp_info->loop_count_ > MAX_LOOP_COUNT) {
LOG_WARN("Loop count is out of range in ANIM chunk.");
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ProcessANMFChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_;
int offset_x, offset_y, width, height, duration, blend, dispose, temp;
if (webp_info->is_processing_anim_frame_) {
LOG_ERROR("ANMF chunk detected within another ANMF chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (!webp_info->chunk_counts_[CHUNK_ANIM]) {
LOG_ERROR("ANMF chunk detected before ANIM chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (chunk_data->size_ <= CHUNK_HEADER_SIZE + ANMF_CHUNK_SIZE) {
LOG_ERROR("Truncated data detected when parsing ANMF chunk.");
return WEBP_INFO_TRUNCATED_DATA;
}
offset_x = 2 * ReadLE24(&data);
offset_y = 2 * ReadLE24(&data);
width = 1 + ReadLE24(&data);
height = 1 + ReadLE24(&data);
duration = ReadLE24(&data);
temp = *data;
dispose = temp & 1;
blend = (temp >> 1) & 1;
++webp_info->chunk_counts_[CHUNK_ANMF];
if (!webp_info->quiet_) {
printf(" Offset_X: %d\n Offset_Y: %d\n Width: %d\n Height: %d\n"
" Duration: %d\n Dispose: %d\n Blend: %d\n",
offset_x, offset_y, width, height, duration, dispose, blend);
}
if (duration > MAX_DURATION) {
LOG_ERROR("Invalid duration parameter in ANMF chunk.");
return WEBP_INFO_INVALID_PARAM;
}
if (offset_x > MAX_POSITION_OFFSET || offset_y > MAX_POSITION_OFFSET) {
LOG_ERROR("Invalid offset parameters in ANMF chunk.");
return WEBP_INFO_INVALID_PARAM;
}
if ((uint64_t)offset_x + width > (uint64_t)webp_info->canvas_width_ ||
(uint64_t)offset_y + height > (uint64_t)webp_info->canvas_height_) {
LOG_ERROR("Frame exceeds canvas in ANMF chunk.");
return WEBP_INFO_INVALID_PARAM;
}
webp_info->is_processing_anim_frame_ = 1;
webp_info->seen_alpha_subchunk_ = 0;
webp_info->seen_image_subchunk_ = 0;
webp_info->frame_width_ = width;
webp_info->frame_height_ = height;
webp_info->anim_frame_data_size_ =
chunk_data->size_ - CHUNK_HEADER_SIZE - ANMF_CHUNK_SIZE;
return WEBP_INFO_OK;
}
static WebPInfoStatus ProcessImageChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
const uint8_t* data = chunk_data->payload_ - CHUNK_HEADER_SIZE;
WebPBitstreamFeatures features;
const VP8StatusCode vp8_status =
WebPGetFeatures(data, chunk_data->size_, &features);
if (vp8_status != VP8_STATUS_OK) {
LOG_ERROR("VP8/VP8L bitstream error.");
return WEBP_INFO_BITSTREAM_ERROR;
}
if (!webp_info->quiet_) {
assert(features.format >= 0 && features.format <= 2);
printf(" Width: %d\n Height: %d\n Alpha: %d\n Animation: %d\n"
" Format: %s (%d)\n",
features.width, features.height, features.has_alpha,
features.has_animation, kFormats[features.format], features.format);
}
if (webp_info->is_processing_anim_frame_) {
++webp_info->anmf_subchunk_counts_[chunk_data->id_ == CHUNK_VP8 ? 0 : 1];
if (chunk_data->id_ == CHUNK_VP8L && webp_info->seen_alpha_subchunk_) {
LOG_ERROR("Both VP8L and ALPH sub-chunks are present in an ANMF chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (webp_info->frame_width_ != features.width ||
webp_info->frame_height_ != features.height) {
LOG_ERROR("Frame size in VP8/VP8L sub-chunk differs from ANMF header.");
return WEBP_INFO_PARSE_ERROR;
}
if (webp_info->seen_image_subchunk_) {
LOG_ERROR("Consecutive VP8/VP8L sub-chunks in an ANMF chunk.");
return WEBP_INFO_PARSE_ERROR;
}
webp_info->seen_image_subchunk_ = 1;
} else {
if (webp_info->chunk_counts_[CHUNK_VP8] ||
webp_info->chunk_counts_[CHUNK_VP8L]) {
LOG_ERROR("Multiple VP8/VP8L chunks detected.");
return WEBP_INFO_PARSE_ERROR;
}
if (chunk_data->id_ == CHUNK_VP8L &&
webp_info->chunk_counts_[CHUNK_ALPHA]) {
LOG_WARN("Both VP8L and ALPH chunks are detected.");
}
if (webp_info->chunk_counts_[CHUNK_ANIM] ||
webp_info->chunk_counts_[CHUNK_ANMF]) {
LOG_ERROR("VP8/VP8L chunk and ANIM/ANMF chunk are both detected.");
return WEBP_INFO_PARSE_ERROR;
}
if (webp_info->chunk_counts_[CHUNK_VP8X]) {
if (webp_info->canvas_width_ != features.width ||
webp_info->canvas_height_ != features.height) {
LOG_ERROR("Image size in VP8/VP8L chunk differs from VP8X chunk.");
return WEBP_INFO_PARSE_ERROR;
}
} else {
webp_info->canvas_width_ = features.width;
webp_info->canvas_height_ = features.height;
if (webp_info->canvas_width_ < 1 || webp_info->canvas_height_ < 1 ||
webp_info->canvas_width_ > MAX_CANVAS_SIZE ||
webp_info->canvas_height_ > MAX_CANVAS_SIZE ||
(uint64_t)webp_info->canvas_width_ * webp_info->canvas_height_ >
MAX_IMAGE_AREA) {
LOG_WARN("Invalid parameters in VP8/VP8L chunk.");
}
}
++webp_info->chunk_counts_[chunk_data->id_];
}
++webp_info->num_frames_;
webp_info->has_alpha_ |= features.has_alpha;
if (webp_info->parse_bitstream_) {
const int is_lossy = (chunk_data->id_ == CHUNK_VP8);
const WebPInfoStatus status =
is_lossy ? ParseLossyHeader(chunk_data, webp_info)
: ParseLosslessHeader(chunk_data, webp_info);
if (status != WEBP_INFO_OK) return status;
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ProcessALPHChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
if (webp_info->is_processing_anim_frame_) {
++webp_info->anmf_subchunk_counts_[2];
if (webp_info->seen_alpha_subchunk_) {
LOG_ERROR("Consecutive ALPH sub-chunks in an ANMF chunk.");
return WEBP_INFO_PARSE_ERROR;
}
webp_info->seen_alpha_subchunk_ = 1;
if (webp_info->seen_image_subchunk_) {
LOG_ERROR("ALPHA sub-chunk detected after VP8 sub-chunk "
"in an ANMF chunk.");
return WEBP_INFO_PARSE_ERROR;
}
} else {
if (webp_info->chunk_counts_[CHUNK_ANIM] ||
webp_info->chunk_counts_[CHUNK_ANMF]) {
LOG_ERROR("ALPHA chunk and ANIM/ANMF chunk are both detected.");
return WEBP_INFO_PARSE_ERROR;
}
if (!webp_info->chunk_counts_[CHUNK_VP8X]) {
LOG_ERROR("ALPHA chunk detected before VP8X chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (webp_info->chunk_counts_[CHUNK_VP8]) {
LOG_ERROR("ALPHA chunk detected after VP8 chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (webp_info->chunk_counts_[CHUNK_ALPHA]) {
LOG_ERROR("Multiple ALPHA chunks detected.");
return WEBP_INFO_PARSE_ERROR;
}
++webp_info->chunk_counts_[CHUNK_ALPHA];
}
webp_info->has_alpha_ = 1;
if (webp_info->parse_bitstream_) {
const WebPInfoStatus status = ParseAlphaHeader(chunk_data, webp_info);
if (status != WEBP_INFO_OK) return status;
}
return WEBP_INFO_OK;
}
static WebPInfoStatus ProcessICCPChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
(void)chunk_data;
if (!webp_info->chunk_counts_[CHUNK_VP8X]) {
LOG_ERROR("ICCP chunk detected before VP8X chunk.");
return WEBP_INFO_PARSE_ERROR;
}
if (webp_info->chunk_counts_[CHUNK_VP8] ||
webp_info->chunk_counts_[CHUNK_VP8L] ||
webp_info->chunk_counts_[CHUNK_ANIM]) {
LOG_ERROR("ICCP chunk detected after image data.");
return WEBP_INFO_PARSE_ERROR;
}
++webp_info->chunk_counts_[CHUNK_ICCP];
return WEBP_INFO_OK;
}
static WebPInfoStatus ProcessChunk(const ChunkData* const chunk_data,
WebPInfo* const webp_info) {
WebPInfoStatus status = WEBP_INFO_OK;
ChunkID id = chunk_data->id_;
if (chunk_data->id_ == CHUNK_UNKNOWN) {
char error_message[50];
snprintf(error_message, 50, "Unknown chunk at offset %6d, length %6d",
(int)chunk_data->offset_, (int)chunk_data->size_);
LOG_WARN(error_message);
} else {
if (!webp_info->quiet_) {
const char* tag = kWebPChunkTags[chunk_data->id_];
printf("Chunk %c%c%c%c at offset %6d, length %6d\n",
tag[0], tag[1], tag[2], tag[3], (int)chunk_data->offset_,
(int)chunk_data->size_);
}
}
switch (id) {
case CHUNK_VP8:
case CHUNK_VP8L:
status = ProcessImageChunk(chunk_data, webp_info);
break;
case CHUNK_VP8X:
status = ProcessVP8XChunk(chunk_data, webp_info);
break;
case CHUNK_ALPHA:
status = ProcessALPHChunk(chunk_data, webp_info);
break;
case CHUNK_ANIM:
status = ProcessANIMChunk(chunk_data, webp_info);
break;
case CHUNK_ANMF:
status = ProcessANMFChunk(chunk_data, webp_info);
break;
case CHUNK_ICCP:
status = ProcessICCPChunk(chunk_data, webp_info);
break;
case CHUNK_EXIF:
case CHUNK_XMP:
++webp_info->chunk_counts_[id];
break;
case CHUNK_UNKNOWN:
default:
break;
}
if (webp_info->is_processing_anim_frame_ && id != CHUNK_ANMF) {
if (webp_info->anim_frame_data_size_ == chunk_data->size_) {
if (!webp_info->seen_image_subchunk_) {
LOG_ERROR("No VP8/VP8L chunk detected in an ANMF chunk.");
return WEBP_INFO_PARSE_ERROR;
}
webp_info->is_processing_anim_frame_ = 0;
} else if (webp_info->anim_frame_data_size_ > chunk_data->size_) {
webp_info->anim_frame_data_size_ -= chunk_data->size_;
} else {
LOG_ERROR("Truncated data detected when parsing ANMF chunk.");
return WEBP_INFO_TRUNCATED_DATA;
}
}
return status;
}
static WebPInfoStatus Validate(const WebPInfo* const webp_info) {
if (webp_info->num_frames_ < 1) {
LOG_ERROR("No image/frame detected.");
return WEBP_INFO_MISSING_DATA;
}
if (webp_info->chunk_counts_[CHUNK_VP8X]) {
const int iccp = !!(webp_info->feature_flags_ & ICCP_FLAG);
const int exif = !!(webp_info->feature_flags_ & EXIF_FLAG);
const int xmp = !!(webp_info->feature_flags_ & XMP_FLAG);
const int animation = !!(webp_info->feature_flags_ & ANIMATION_FLAG);
const int alpha = !!(webp_info->feature_flags_ & ALPHA_FLAG);
if (!alpha && webp_info->has_alpha_) {
LOG_ERROR("Unexpected alpha data detected.");
return WEBP_INFO_PARSE_ERROR;
}
if (alpha && !webp_info->has_alpha_) {
LOG_WARN("Alpha flag is set with no alpha data present.");
}
if (iccp && !webp_info->chunk_counts_[CHUNK_ICCP]) {
LOG_ERROR("Missing ICCP chunk.");
return WEBP_INFO_MISSING_DATA;
}
if (exif && !webp_info->chunk_counts_[CHUNK_EXIF]) {
LOG_ERROR("Missing EXIF chunk.");
return WEBP_INFO_MISSING_DATA;
}
if (xmp && !webp_info->chunk_counts_[CHUNK_XMP]) {
LOG_ERROR("Missing XMP chunk.");
return WEBP_INFO_MISSING_DATA;
}
if (!iccp && webp_info->chunk_counts_[CHUNK_ICCP]) {
LOG_ERROR("Unexpected ICCP chunk detected.");
return WEBP_INFO_PARSE_ERROR;
}
if (!exif && webp_info->chunk_counts_[CHUNK_EXIF]) {
LOG_ERROR("Unexpected EXIF chunk detected.");
return WEBP_INFO_PARSE_ERROR;
}
if (!xmp && webp_info->chunk_counts_[CHUNK_XMP]) {
LOG_ERROR("Unexpected XMP chunk detected.");
return WEBP_INFO_PARSE_ERROR;
}
// Incomplete animation frame.
if (webp_info->is_processing_anim_frame_) return WEBP_INFO_MISSING_DATA;
if (!animation && webp_info->num_frames_ > 1) {
LOG_ERROR("More than 1 frame detected in non-animation file.");
return WEBP_INFO_PARSE_ERROR;
}
if (animation && (!webp_info->chunk_counts_[CHUNK_ANIM] ||
!webp_info->chunk_counts_[CHUNK_ANMF])) {
LOG_ERROR("No ANIM/ANMF chunk detected in animation file.");
return WEBP_INFO_PARSE_ERROR;
}
}
return WEBP_INFO_OK;
}
static void ShowSummary(const WebPInfo* const webp_info) {
int i;
printf("Summary:\n");
printf("Number of frames: %d\n", webp_info->num_frames_);
printf("Chunk type : VP8 VP8L VP8X ALPH ANIM ANMF(VP8 /VP8L/ALPH) ICCP "
"EXIF XMP\n");
printf("Chunk counts: ");
for (i = 0; i < CHUNK_TYPES; ++i) {
printf("%4d ", webp_info->chunk_counts_[i]);
if (i == CHUNK_ANMF) {
printf("%4d %4d %4d ",
webp_info->anmf_subchunk_counts_[0],
webp_info->anmf_subchunk_counts_[1],
webp_info->anmf_subchunk_counts_[2]);
}
}
printf("\n");
}
static WebPInfoStatus AnalyzeWebP(WebPInfo* const webp_info,
const WebPData* webp_data) {
ChunkData chunk_data;
MemBuffer mem_buffer;
WebPInfoStatus webp_info_status = WEBP_INFO_OK;
InitMemBuffer(&mem_buffer, webp_data);
webp_info_status = ParseRIFFHeader(webp_info, &mem_buffer);
if (webp_info_status != WEBP_INFO_OK) goto Error;
// Loop through all the chunks. Terminate immediately in case of error.
while (webp_info_status == WEBP_INFO_OK && MemDataSize(&mem_buffer) > 0) {
webp_info_status = ParseChunk(webp_info, &mem_buffer, &chunk_data);
if (webp_info_status != WEBP_INFO_OK) goto Error;
webp_info_status = ProcessChunk(&chunk_data, webp_info);
}
if (webp_info_status != WEBP_INFO_OK) goto Error;
if (webp_info->show_summary_) ShowSummary(webp_info);
// Final check.
webp_info_status = Validate(webp_info);
Error:
if (!webp_info->quiet_) {
if (webp_info_status == WEBP_INFO_OK) {
printf("No error detected.\n");
} else {
printf("Errors detected.\n");
}
}
return webp_info_status;
}
static void HelpShort(void) {
printf("Usage: webpinfo [options] in_files\n"
"Try -longhelp for an exhaustive list of options.\n");
}
static void HelpLong(void) {
printf("Usage: webpinfo [options] in_files\n"
"Note: there could be multiple input files;\n"
" options must come before input files.\n"
"Options:\n"
" -version ........... Print version number and exit.\n"
" -quiet ............. Do not show chunk parsing information.\n"
" -diag .............. Show parsing error diagnosis.\n"
" -summary ........... Show chunk stats summary.\n"
" -bitstream_info .... Parse bitstream header.\n");
}
int main(int argc, const char* argv[]) {
int c, quiet = 0, show_diag = 0, show_summary = 0;
int parse_bitstream = 0;
WebPInfoStatus webp_info_status = WEBP_INFO_OK;
WebPInfo webp_info;
if (argc == 1) {
HelpShort();
return WEBP_INFO_OK;
}
// Parse command-line input.
for (c = 1; c < argc; ++c) {
if (!strcmp(argv[c], "-h") || !strcmp(argv[c], "-help")) {
HelpShort();
return WEBP_INFO_OK;
} else if (!strcmp(argv[c], "-H") || !strcmp(argv[c], "-longhelp")) {
HelpLong();
return WEBP_INFO_OK;
} else if (!strcmp(argv[c], "-quiet")) {
quiet = 1;
} else if (!strcmp(argv[c], "-diag")) {
show_diag = 1;
} else if (!strcmp(argv[c], "-summary")) {
show_summary = 1;
} else if (!strcmp(argv[c], "-bitstream_info")) {
parse_bitstream = 1;
} else if (!strcmp(argv[c], "-version")) {
const int version = WebPGetDecoderVersion();
printf("WebP Decoder version: %d.%d.%d\n",
(version >> 16) & 0xff, (version >> 8) & 0xff, version & 0xff);
return 0;
} else { // Assume the remaining are all input files.
break;
}
}
if (c == argc) {
HelpShort();
return WEBP_INFO_INVALID_COMMAND;
}
// Process input files one by one.
for (; c < argc; ++c) {
WebPData webp_data;
const char* in_file = NULL;
WebPInfoInit(&webp_info);
webp_info.quiet_ = quiet;
webp_info.show_diagnosis_ = show_diag;
webp_info.show_summary_ = show_summary;
webp_info.parse_bitstream_ = parse_bitstream;
in_file = argv[c];
if (in_file == NULL || !ReadFileToWebPData(in_file, &webp_data)) {
webp_info_status = WEBP_INFO_INVALID_COMMAND;
fprintf(stderr, "Failed to open input file %s.\n", in_file);
continue;
}
if (!webp_info.quiet_) printf("File: %s\n", in_file);
webp_info_status = AnalyzeWebP(&webp_info, &webp_data);
WebPDataClear(&webp_data);
}
return webp_info_status;
}
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