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// Copyright 2018 The PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "samples/pdfium_test_write_helper.h"
#include <limits.h>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "public/cpp/fpdf_scopers.h"
#include "public/fpdf_annot.h"
#include "public/fpdf_attachment.h"
#include "public/fpdf_edit.h"
#include "public/fpdf_thumbnail.h"
#include "testing/fx_string_testhelpers.h"
#include "testing/image_diff/image_diff_png.h"
#include "third_party/base/notreached.h"
namespace {
bool CheckDimensions(int stride, int width, int height) {
if (stride < 0 || width < 0 || height < 0)
return false;
if (height > 0 && stride > INT_MAX / height)
return false;
return true;
}
const char* AnnotSubtypeToCString(FPDF_ANNOTATION_SUBTYPE subtype) {
if (subtype == FPDF_ANNOT_TEXT)
return "Text";
if (subtype == FPDF_ANNOT_LINK)
return "Link";
if (subtype == FPDF_ANNOT_FREETEXT)
return "FreeText";
if (subtype == FPDF_ANNOT_LINE)
return "Line";
if (subtype == FPDF_ANNOT_SQUARE)
return "Square";
if (subtype == FPDF_ANNOT_CIRCLE)
return "Circle";
if (subtype == FPDF_ANNOT_POLYGON)
return "Polygon";
if (subtype == FPDF_ANNOT_POLYLINE)
return "PolyLine";
if (subtype == FPDF_ANNOT_HIGHLIGHT)
return "Highlight";
if (subtype == FPDF_ANNOT_UNDERLINE)
return "Underline";
if (subtype == FPDF_ANNOT_SQUIGGLY)
return "Squiggly";
if (subtype == FPDF_ANNOT_STRIKEOUT)
return "StrikeOut";
if (subtype == FPDF_ANNOT_STAMP)
return "Stamp";
if (subtype == FPDF_ANNOT_CARET)
return "Caret";
if (subtype == FPDF_ANNOT_INK)
return "Ink";
if (subtype == FPDF_ANNOT_POPUP)
return "Popup";
if (subtype == FPDF_ANNOT_FILEATTACHMENT)
return "FileAttachment";
if (subtype == FPDF_ANNOT_SOUND)
return "Sound";
if (subtype == FPDF_ANNOT_MOVIE)
return "Movie";
if (subtype == FPDF_ANNOT_WIDGET)
return "Widget";
if (subtype == FPDF_ANNOT_SCREEN)
return "Screen";
if (subtype == FPDF_ANNOT_PRINTERMARK)
return "PrinterMark";
if (subtype == FPDF_ANNOT_TRAPNET)
return "TrapNet";
if (subtype == FPDF_ANNOT_WATERMARK)
return "Watermark";
if (subtype == FPDF_ANNOT_THREED)
return "3D";
if (subtype == FPDF_ANNOT_RICHMEDIA)
return "RichMedia";
if (subtype == FPDF_ANNOT_XFAWIDGET)
return "XFAWidget";
NOTREACHED();
return "";
}
void AppendFlagString(const char* flag, std::string* output) {
if (!output->empty())
*output += ", ";
*output += flag;
}
std::string AnnotFlagsToString(int flags) {
std::string str;
if (flags & FPDF_ANNOT_FLAG_INVISIBLE)
AppendFlagString("Invisible", &str);
if (flags & FPDF_ANNOT_FLAG_HIDDEN)
AppendFlagString("Hidden", &str);
if (flags & FPDF_ANNOT_FLAG_PRINT)
AppendFlagString("Print", &str);
if (flags & FPDF_ANNOT_FLAG_NOZOOM)
AppendFlagString("NoZoom", &str);
if (flags & FPDF_ANNOT_FLAG_NOROTATE)
AppendFlagString("NoRotate", &str);
if (flags & FPDF_ANNOT_FLAG_NOVIEW)
AppendFlagString("NoView", &str);
if (flags & FPDF_ANNOT_FLAG_READONLY)
AppendFlagString("ReadOnly", &str);
if (flags & FPDF_ANNOT_FLAG_LOCKED)
AppendFlagString("Locked", &str);
if (flags & FPDF_ANNOT_FLAG_TOGGLENOVIEW)
AppendFlagString("ToggleNoView", &str);
return str;
}
const char* PageObjectTypeToCString(int type) {
if (type == FPDF_PAGEOBJ_TEXT)
return "Text";
if (type == FPDF_PAGEOBJ_PATH)
return "Path";
if (type == FPDF_PAGEOBJ_IMAGE)
return "Image";
if (type == FPDF_PAGEOBJ_SHADING)
return "Shading";
if (type == FPDF_PAGEOBJ_FORM)
return "Form";
NOTREACHED();
return "";
}
std::vector<uint8_t> EncodePng(pdfium::span<const uint8_t> input,
int width,
int height,
int stride,
int format) {
std::vector<uint8_t> png;
switch (format) {
case FPDFBitmap_Unknown:
break;
case FPDFBitmap_Gray:
png = image_diff_png::EncodeGrayPNG(input, width, height, stride);
break;
case FPDFBitmap_BGR:
png = image_diff_png::EncodeBGRPNG(input, width, height, stride);
break;
case FPDFBitmap_BGRx:
png = image_diff_png::EncodeBGRAPNG(input, width, height, stride,
/*discard_transparency=*/true);
break;
case FPDFBitmap_BGRA:
png = image_diff_png::EncodeBGRAPNG(input, width, height, stride,
/*discard_transparency=*/false);
break;
default:
NOTREACHED();
}
return png;
}
#ifdef _WIN32
int CALLBACK EnhMetaFileProc(HDC hdc,
HANDLETABLE* handle_table,
const ENHMETARECORD* record,
int objects_count,
LPARAM param) {
std::vector<const ENHMETARECORD*>& items =
*reinterpret_cast<std::vector<const ENHMETARECORD*>*>(param);
items.push_back(record);
return 1;
}
#endif // _WIN32
} // namespace
std::string WritePpm(const char* pdf_name,
int num,
void* buffer_void,
int stride,
int width,
int height) {
if (!CheckDimensions(stride, width, height))
return "";
int out_len = width * height;
if (out_len > INT_MAX / 3)
return "";
out_len *= 3;
char filename[256];
snprintf(filename, sizeof(filename), "%s.%d.ppm", pdf_name, num);
FILE* fp = fopen(filename, "wb");
if (!fp)
return "";
fprintf(fp, "P6\n# PDF test render\n%d %d\n255\n", width, height);
// Source data is B, G, R, unused.
// Dest data is R, G, B.
const uint8_t* buffer = reinterpret_cast<const uint8_t*>(buffer_void);
std::vector<uint8_t> result(out_len);
for (int h = 0; h < height; ++h) {
const uint8_t* src_line = buffer + (stride * h);
uint8_t* dest_line = result.data() + (width * h * 3);
for (int w = 0; w < width; ++w) {
// R
dest_line[w * 3] = src_line[(w * 4) + 2];
// G
dest_line[(w * 3) + 1] = src_line[(w * 4) + 1];
// B
dest_line[(w * 3) + 2] = src_line[w * 4];
}
}
if (fwrite(result.data(), out_len, 1, fp) != 1)
fprintf(stderr, "Failed to write to %s\n", filename);
fclose(fp);
return std::string(filename);
}
void WriteText(FPDF_TEXTPAGE textpage, const char* pdf_name, int num) {
char filename[256];
int chars_formatted =
snprintf(filename, sizeof(filename), "%s.%d.txt", pdf_name, num);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(filename)) {
fprintf(stderr, "Filename %s is too long\n", filename);
return;
}
FILE* fp = fopen(filename, "w");
if (!fp) {
fprintf(stderr, "Failed to open %s for output\n", filename);
return;
}
// Output in UTF32-LE.
uint32_t bom = 0x0000FEFF;
if (fwrite(&bom, sizeof(bom), 1, fp) != 1) {
fprintf(stderr, "Failed to write to %s\n", filename);
(void)fclose(fp);
return;
}
for (int i = 0; i < FPDFText_CountChars(textpage); i++) {
uint32_t c = FPDFText_GetUnicode(textpage, i);
if (fwrite(&c, sizeof(c), 1, fp) != 1) {
fprintf(stderr, "Failed to write to %s\n", filename);
break;
}
}
(void)fclose(fp);
}
void WriteAnnot(FPDF_PAGE page, const char* pdf_name, int num) {
// Open the output text file.
char filename[256];
int chars_formatted =
snprintf(filename, sizeof(filename), "%s.%d.annot.txt", pdf_name, num);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(filename)) {
fprintf(stderr, "Filename %s is too long\n", filename);
return;
}
FILE* fp = fopen(filename, "w");
if (!fp) {
fprintf(stderr, "Failed to open %s for output\n", filename);
return;
}
int annot_count = FPDFPage_GetAnnotCount(page);
fprintf(fp, "Number of annotations: %d\n\n", annot_count);
// Iterate through all annotations on this page.
for (int i = 0; i < annot_count; ++i) {
// Retrieve the annotation object and its subtype.
fprintf(fp, "Annotation #%d:\n", i + 1);
ScopedFPDFAnnotation annot(FPDFPage_GetAnnot(page, i));
if (!annot) {
fprintf(fp, "Failed to retrieve annotation!\n\n");
continue;
}
FPDF_ANNOTATION_SUBTYPE subtype = FPDFAnnot_GetSubtype(annot.get());
fprintf(fp, "Subtype: %s\n", AnnotSubtypeToCString(subtype));
// Retrieve the annotation flags.
fprintf(fp, "Flags set: %s\n",
AnnotFlagsToString(FPDFAnnot_GetFlags(annot.get())).c_str());
// Retrieve the annotation's object count and object types.
const int obj_count = FPDFAnnot_GetObjectCount(annot.get());
fprintf(fp, "Number of objects: %d\n", obj_count);
if (obj_count > 0) {
fprintf(fp, "Object types: ");
for (int j = 0; j < obj_count; ++j) {
const char* type = PageObjectTypeToCString(
FPDFPageObj_GetType(FPDFAnnot_GetObject(annot.get(), j)));
fprintf(fp, "%s ", type);
}
fprintf(fp, "\n");
}
// Retrieve the annotation's color and interior color.
unsigned int R;
unsigned int G;
unsigned int B;
unsigned int A;
if (FPDFAnnot_GetColor(annot.get(), FPDFANNOT_COLORTYPE_Color, &R, &G, &B,
&A)) {
fprintf(fp, "Color in RGBA: %d %d %d %d\n", R, G, B, A);
} else {
fprintf(fp, "Failed to retrieve color.\n");
}
if (FPDFAnnot_GetColor(annot.get(), FPDFANNOT_COLORTYPE_InteriorColor, &R,
&G, &B, &A)) {
fprintf(fp, "Interior color in RGBA: %d %d %d %d\n", R, G, B, A);
} else {
fprintf(fp, "Failed to retrieve interior color.\n");
}
// Retrieve the annotation's contents and author.
static constexpr char kContentsKey[] = "Contents";
static constexpr char kAuthorKey[] = "T";
unsigned long length_bytes =
FPDFAnnot_GetStringValue(annot.get(), kContentsKey, nullptr, 0);
std::vector<FPDF_WCHAR> buf = GetFPDFWideStringBuffer(length_bytes);
FPDFAnnot_GetStringValue(annot.get(), kContentsKey, buf.data(),
length_bytes);
fprintf(fp, "Content: %ls\n", GetPlatformWString(buf.data()).c_str());
length_bytes =
FPDFAnnot_GetStringValue(annot.get(), kAuthorKey, nullptr, 0);
buf = GetFPDFWideStringBuffer(length_bytes);
FPDFAnnot_GetStringValue(annot.get(), kAuthorKey, buf.data(), length_bytes);
fprintf(fp, "Author: %ls\n", GetPlatformWString(buf.data()).c_str());
// Retrieve the annotation's quadpoints if it is a markup annotation.
if (FPDFAnnot_HasAttachmentPoints(annot.get())) {
size_t qp_count = FPDFAnnot_CountAttachmentPoints(annot.get());
fprintf(fp, "Number of quadpoints sets: %zu\n", qp_count);
// Iterate through all quadpoints of the current annotation
for (size_t j = 0; j < qp_count; ++j) {
FS_QUADPOINTSF quadpoints;
if (FPDFAnnot_GetAttachmentPoints(annot.get(), j, &quadpoints)) {
fprintf(fp,
"Quadpoints set #%zu: (%.3f, %.3f), (%.3f, %.3f), "
"(%.3f, %.3f), (%.3f, %.3f)\n",
j + 1, quadpoints.x1, quadpoints.y1, quadpoints.x2,
quadpoints.y2, quadpoints.x3, quadpoints.y3, quadpoints.x4,
quadpoints.y4);
} else {
fprintf(fp, "Failed to retrieve quadpoints set #%zu.\n", j + 1);
}
}
}
// Retrieve the annotation's rectangle coordinates.
FS_RECTF rect;
if (FPDFAnnot_GetRect(annot.get(), &rect)) {
fprintf(fp, "Rectangle: l - %.3f, b - %.3f, r - %.3f, t - %.3f\n\n",
rect.left, rect.bottom, rect.right, rect.top);
} else {
fprintf(fp, "Failed to retrieve annotation rectangle.\n");
}
}
(void)fclose(fp);
}
std::string WritePng(const char* pdf_name,
int num,
void* buffer,
int stride,
int width,
int height) {
if (!CheckDimensions(stride, width, height))
return "";
auto input =
pdfium::make_span(static_cast<uint8_t*>(buffer), stride * height);
std::vector<uint8_t> png_encoding =
EncodePng(input, width, height, stride, FPDFBitmap_BGRA);
if (png_encoding.empty()) {
fprintf(stderr, "Failed to convert bitmap to PNG\n");
return "";
}
char filename[256];
int chars_formatted =
snprintf(filename, sizeof(filename), "%s.%d.png", pdf_name, num);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(filename)) {
fprintf(stderr, "Filename %s is too long\n", filename);
return "";
}
FILE* fp = fopen(filename, "wb");
if (!fp) {
fprintf(stderr, "Failed to open %s for output\n", filename);
return "";
}
size_t bytes_written =
fwrite(&png_encoding.front(), 1, png_encoding.size(), fp);
if (bytes_written != png_encoding.size())
fprintf(stderr, "Failed to write to %s\n", filename);
(void)fclose(fp);
return std::string(filename);
}
#ifdef _WIN32
std::string WriteBmp(const char* pdf_name,
int num,
void* buffer,
int stride,
int width,
int height) {
if (!CheckDimensions(stride, width, height))
return "";
int out_len = stride * height;
if (out_len > INT_MAX / 3)
return "";
char filename[256];
snprintf(filename, sizeof(filename), "%s.%d.bmp", pdf_name, num);
FILE* fp = fopen(filename, "wb");
if (!fp)
return "";
BITMAPINFO bmi = {};
bmi.bmiHeader.biSize = sizeof(bmi) - sizeof(RGBQUAD);
bmi.bmiHeader.biWidth = width;
bmi.bmiHeader.biHeight = -height; // top-down image
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = 0;
BITMAPFILEHEADER file_header = {};
file_header.bfType = 0x4d42;
file_header.bfSize = sizeof(file_header) + bmi.bmiHeader.biSize + out_len;
file_header.bfOffBits = file_header.bfSize - out_len;
if (fwrite(&file_header, sizeof(file_header), 1, fp) != 1 ||
fwrite(&bmi, bmi.bmiHeader.biSize, 1, fp) != 1 ||
fwrite(buffer, out_len, 1, fp) != 1) {
fprintf(stderr, "Failed to write to %s\n", filename);
}
fclose(fp);
return std::string(filename);
}
void WriteEmf(FPDF_PAGE page, const char* pdf_name, int num) {
char filename[256];
snprintf(filename, sizeof(filename), "%s.%d.emf", pdf_name, num);
HDC dc = CreateEnhMetaFileA(nullptr, filename, nullptr, nullptr);
int width = static_cast<int>(FPDF_GetPageWidthF(page));
int height = static_cast<int>(FPDF_GetPageHeightF(page));
HRGN rgn = CreateRectRgn(0, 0, width, height);
SelectClipRgn(dc, rgn);
DeleteObject(rgn);
SelectObject(dc, GetStockObject(NULL_PEN));
SelectObject(dc, GetStockObject(WHITE_BRUSH));
// If a PS_NULL pen is used, the dimensions of the rectangle are 1 pixel less.
Rectangle(dc, 0, 0, width + 1, height + 1);
FPDF_RenderPage(dc, page, 0, 0, width, height, 0, FPDF_ANNOT | FPDF_PRINTING);
DeleteEnhMetaFile(CloseEnhMetaFile(dc));
}
void WritePS(FPDF_PAGE page, const char* pdf_name, int num) {
char filename[256];
snprintf(filename, sizeof(filename), "%s.%d.ps", pdf_name, num);
FILE* fp = fopen(filename, "wb");
if (!fp)
return;
HDC dc = CreateEnhMetaFileA(nullptr, nullptr, nullptr, nullptr);
int width = static_cast<int>(FPDF_GetPageWidthF(page));
int height = static_cast<int>(FPDF_GetPageHeightF(page));
FPDF_RenderPage(dc, page, 0, 0, width, height, 0, FPDF_ANNOT | FPDF_PRINTING);
HENHMETAFILE emf = CloseEnhMetaFile(dc);
std::vector<const ENHMETARECORD*> items;
EnumEnhMetaFile(nullptr, emf, &EnhMetaFileProc, &items, nullptr);
for (const ENHMETARECORD* record : items) {
if (record->iType != EMR_GDICOMMENT)
continue;
const auto* comment = reinterpret_cast<const EMRGDICOMMENT*>(record);
const char* data = reinterpret_cast<const char*>(comment->Data);
uint16_t size = *reinterpret_cast<const uint16_t*>(data);
if (fwrite(data + sizeof(uint16_t), size, 1, fp) != 1) {
fprintf(stderr, "Failed to write to %s\n", filename);
break;
}
}
fclose(fp);
DeleteEnhMetaFile(emf);
}
#endif // _WIN32
#ifdef PDF_ENABLE_SKIA
std::string WriteSkp(const char* pdf_name,
int num,
SkPictureRecorder* recorder) {
char filename[256];
int chars_formatted =
snprintf(filename, sizeof(filename), "%s.%d.skp", pdf_name, num);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(filename)) {
fprintf(stderr, "Filename %s is too long\n", filename);
return "";
}
sk_sp<SkPicture> picture(recorder->finishRecordingAsPicture());
SkFILEWStream wStream(filename);
picture->serialize(&wStream);
return std::string(filename);
}
#endif
enum class ThumbnailDecodeType { kBitmap, kRawStream, kDecodedStream };
bool GetThumbnailFilename(char* name_buf,
size_t name_buf_size,
const char* pdf_name,
int page_num,
ThumbnailDecodeType decode_type) {
const char* format;
switch (decode_type) {
case ThumbnailDecodeType::kBitmap:
format = "%s.thumbnail.%d.png";
break;
case ThumbnailDecodeType::kDecodedStream:
format = "%s.thumbnail.decoded.%d.bin";
break;
case ThumbnailDecodeType::kRawStream:
format = "%s.thumbnail.raw.%d.bin";
break;
}
int chars_formatted =
snprintf(name_buf, name_buf_size, format, pdf_name, page_num);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= name_buf_size) {
fprintf(stderr, "Filename %s for saving is too long.\n", name_buf);
return false;
}
return true;
}
void WriteBufferToFile(const void* buf,
size_t buflen,
const char* filename,
const char* filetype) {
FILE* fp = fopen(filename, "wb");
if (!fp) {
fprintf(stderr, "Failed to open %s for saving %s.", filename, filetype);
return;
}
size_t bytes_written = fwrite(buf, 1, buflen, fp);
if (bytes_written == buflen)
fprintf(stderr, "Successfully wrote %s %s.\n", filetype, filename);
else
fprintf(stderr, "Failed to write to %s.\n", filename);
fclose(fp);
}
std::vector<uint8_t> EncodeBitmapToPng(ScopedFPDFBitmap bitmap) {
std::vector<uint8_t> png_encoding;
int format = FPDFBitmap_GetFormat(bitmap.get());
if (format == FPDFBitmap_Unknown)
return png_encoding;
int width = FPDFBitmap_GetWidth(bitmap.get());
int height = FPDFBitmap_GetHeight(bitmap.get());
int stride = FPDFBitmap_GetStride(bitmap.get());
if (!CheckDimensions(stride, width, height))
return png_encoding;
auto input = pdfium::make_span(
static_cast<const uint8_t*>(FPDFBitmap_GetBuffer(bitmap.get())),
stride * height);
png_encoding = EncodePng(input, width, height, stride, format);
return png_encoding;
}
void WriteAttachments(FPDF_DOCUMENT doc, const std::string& name) {
for (int i = 0; i < FPDFDoc_GetAttachmentCount(doc); ++i) {
FPDF_ATTACHMENT attachment = FPDFDoc_GetAttachment(doc, i);
// Retrieve the attachment file name.
std::string attachment_name;
unsigned long length_bytes = FPDFAttachment_GetName(attachment, nullptr, 0);
if (length_bytes) {
std::vector<FPDF_WCHAR> buf = GetFPDFWideStringBuffer(length_bytes);
unsigned long actual_length_bytes =
FPDFAttachment_GetName(attachment, buf.data(), length_bytes);
if (actual_length_bytes == length_bytes)
attachment_name = GetPlatformString(buf.data());
}
if (attachment_name.empty()) {
fprintf(stderr, "Attachment #%d has an empty file name.\n", i + 1);
continue;
}
// Calculate the full attachment file name.
char save_name[256];
int chars_formatted =
snprintf(save_name, sizeof(save_name), "%s.attachment.%s", name.c_str(),
attachment_name.c_str());
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(save_name)) {
fprintf(stderr, "Filename %s is too long.\n", save_name);
continue;
}
// Retrieve the attachment.
if (!FPDFAttachment_GetFile(attachment, nullptr, 0, &length_bytes)) {
fprintf(stderr, "Failed to retrieve attachment \"%s\".\n",
attachment_name.c_str());
continue;
}
std::vector<char> data_buf(length_bytes);
if (length_bytes) {
unsigned long actual_length_bytes;
if (!FPDFAttachment_GetFile(attachment, data_buf.data(), length_bytes,
&actual_length_bytes)) {
fprintf(stderr, "Failed to retrieve attachment \"%s\".\n",
attachment_name.c_str());
continue;
}
}
// Write the attachment file. Since a PDF document could have 0-byte files
// as attachments, we should allow saving the 0-byte attachments to files.
WriteBufferToFile(data_buf.data(), length_bytes, save_name, "attachment");
}
}
void WriteImages(FPDF_PAGE page, const char* pdf_name, int page_num) {
for (int i = 0; i < FPDFPage_CountObjects(page); ++i) {
FPDF_PAGEOBJECT obj = FPDFPage_GetObject(page, i);
if (FPDFPageObj_GetType(obj) != FPDF_PAGEOBJ_IMAGE)
continue;
ScopedFPDFBitmap bitmap(FPDFImageObj_GetBitmap(obj));
if (!bitmap) {
fprintf(stderr, "Image object #%d on page #%d has an empty bitmap.\n",
i + 1, page_num + 1);
continue;
}
char filename[256];
int chars_formatted = snprintf(filename, sizeof(filename), "%s.%d.%d.png",
pdf_name, page_num, i);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(filename)) {
fprintf(stderr, "Filename %s for saving image is too long.\n", filename);
continue;
}
std::vector<uint8_t> png_encoding = EncodeBitmapToPng(std::move(bitmap));
if (png_encoding.empty()) {
fprintf(stderr,
"Failed to convert image object #%d, on page #%d to png.\n",
i + 1, page_num + 1);
continue;
}
WriteBufferToFile(&png_encoding.front(), png_encoding.size(), filename,
"image");
}
}
void WriteRenderedImages(FPDF_DOCUMENT doc,
FPDF_PAGE page,
const char* pdf_name,
int page_num) {
for (int i = 0; i < FPDFPage_CountObjects(page); ++i) {
FPDF_PAGEOBJECT obj = FPDFPage_GetObject(page, i);
if (FPDFPageObj_GetType(obj) != FPDF_PAGEOBJ_IMAGE)
continue;
ScopedFPDFBitmap bitmap(FPDFImageObj_GetRenderedBitmap(doc, page, obj));
if (!bitmap) {
fprintf(stderr, "Image object #%d on page #%d has an empty bitmap.\n",
i + 1, page_num + 1);
continue;
}
char filename[256];
int chars_formatted = snprintf(filename, sizeof(filename), "%s.%d.%d.png",
pdf_name, page_num, i);
if (chars_formatted < 0 ||
static_cast<size_t>(chars_formatted) >= sizeof(filename)) {
fprintf(stderr, "Filename %s for saving image is too long.\n", filename);
continue;
}
std::vector<uint8_t> png_encoding = EncodeBitmapToPng(std::move(bitmap));
if (png_encoding.empty()) {
fprintf(stderr,
"Failed to convert image object #%d, on page #%d to png.\n",
i + 1, page_num + 1);
continue;
}
WriteBufferToFile(&png_encoding.front(), png_encoding.size(), filename,
"image");
}
}
void WriteDecodedThumbnailStream(FPDF_PAGE page,
const char* pdf_name,
int page_num) {
char filename[256];
if (!GetThumbnailFilename(filename, sizeof(filename), pdf_name, page_num,
ThumbnailDecodeType::kDecodedStream)) {
return;
}
unsigned long decoded_data_size =
FPDFPage_GetDecodedThumbnailData(page, nullptr, 0u);
// Only continue if there actually is a thumbnail for this page
if (decoded_data_size == 0) {
fprintf(stderr, "Failed to get decoded thumbnail for page #%d.\n",
page_num + 1);
return;
}
std::vector<uint8_t> thumb_buf(decoded_data_size);
if (FPDFPage_GetDecodedThumbnailData(
page, thumb_buf.data(), decoded_data_size) != decoded_data_size) {
fprintf(stderr, "Failed to get decoded thumbnail data for %s.\n", filename);
return;
}
WriteBufferToFile(thumb_buf.data(), decoded_data_size, filename,
"decoded thumbnail");
}
void WriteRawThumbnailStream(FPDF_PAGE page,
const char* pdf_name,
int page_num) {
char filename[256];
if (!GetThumbnailFilename(filename, sizeof(filename), pdf_name, page_num,
ThumbnailDecodeType::kRawStream)) {
return;
}
unsigned long raw_data_size = FPDFPage_GetRawThumbnailData(page, nullptr, 0u);
// Only continue if there actually is a thumbnail for this page
if (raw_data_size == 0) {
fprintf(stderr, "Failed to get raw thumbnail data for page #%d.\n",
page_num + 1);
return;
}
std::vector<uint8_t> thumb_buf(raw_data_size);
if (FPDFPage_GetRawThumbnailData(page, thumb_buf.data(), raw_data_size) !=
raw_data_size) {
fprintf(stderr, "Failed to get raw thumbnail data for %s.\n", filename);
return;
}
WriteBufferToFile(thumb_buf.data(), raw_data_size, filename, "raw thumbnail");
}
void WriteThumbnail(FPDF_PAGE page, const char* pdf_name, int page_num) {
char filename[256];
if (!GetThumbnailFilename(filename, sizeof(filename), pdf_name, page_num,
ThumbnailDecodeType::kBitmap)) {
return;
}
ScopedFPDFBitmap thumb_bitmap(FPDFPage_GetThumbnailAsBitmap(page));
if (!thumb_bitmap) {
fprintf(stderr, "Thumbnail of page #%d has an empty bitmap.\n",
page_num + 1);
return;
}
std::vector<uint8_t> png_encoding =
EncodeBitmapToPng(std::move(thumb_bitmap));
if (png_encoding.empty()) {
fprintf(stderr, "Failed to convert thumbnail of page #%d to png.\n",
page_num + 1);
return;
}
WriteBufferToFile(&png_encoding.front(), png_encoding.size(), filename,
"thumbnail");
}