1 // Copyright 2014 PDFium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
6
7 #include <limits.h>
8
9 #include "core/include/fpdfapi/fpdf_module.h"
10 #include "core/include/fpdfapi/fpdf_parser.h"
11 #include "core/include/fxcodec/fx_codec.h"
12 #include "core/include/fxcrt/fx_ext.h"
13
14 #define _STREAM_MAX_SIZE_ 20 * 1024 * 1024
15
16 const FX_WORD PDFDocEncoding[256] = {
17 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008,
18 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f, 0x0010, 0x0011,
19 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017, 0x02d8, 0x02c7, 0x02c6,
20 0x02d9, 0x02dd, 0x02db, 0x02da, 0x02dc, 0x0020, 0x0021, 0x0022, 0x0023,
21 0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b, 0x002c,
22 0x002d, 0x002e, 0x002f, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035,
23 0x0036, 0x0037, 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e,
24 0x003f, 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
25 0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f, 0x0050,
26 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059,
27 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f, 0x0060, 0x0061, 0x0062,
28 0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006a, 0x006b,
29 0x006c, 0x006d, 0x006e, 0x006f, 0x0070, 0x0071, 0x0072, 0x0073, 0x0074,
30 0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d,
31 0x007e, 0x0000, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014, 0x2013, 0x0192,
32 0x2044, 0x2039, 0x203a, 0x2212, 0x2030, 0x201e, 0x201c, 0x201d, 0x2018,
33 0x2019, 0x201a, 0x2122, 0xfb01, 0xfb02, 0x0141, 0x0152, 0x0160, 0x0178,
34 0x017d, 0x0131, 0x0142, 0x0153, 0x0161, 0x017e, 0x0000, 0x20ac, 0x00a1,
35 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7, 0x00a8, 0x00a9, 0x00aa,
36 0x00ab, 0x00ac, 0x0000, 0x00ae, 0x00af, 0x00b0, 0x00b1, 0x00b2, 0x00b3,
37 0x00b4, 0x00b5, 0x00b6, 0x00b7, 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc,
38 0x00bd, 0x00be, 0x00bf, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5,
39 0x00c6, 0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
40 0x00cf, 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
41 0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df, 0x00e0,
42 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7, 0x00e8, 0x00e9,
43 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef, 0x00f0, 0x00f1, 0x00f2,
44 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7, 0x00f8, 0x00f9, 0x00fa, 0x00fb,
45 0x00fc, 0x00fd, 0x00fe, 0x00ff};
46
A85Decode(const uint8_t * src_buf,FX_DWORD src_size,uint8_t * & dest_buf,FX_DWORD & dest_size)47 FX_DWORD A85Decode(const uint8_t* src_buf,
48 FX_DWORD src_size,
49 uint8_t*& dest_buf,
50 FX_DWORD& dest_size) {
51 dest_size = 0;
52 dest_buf = NULL;
53 if (src_size == 0) {
54 return 0;
55 }
56 FX_DWORD zcount = 0;
57 FX_DWORD pos = 0;
58 while (pos < src_size) {
59 uint8_t ch = src_buf[pos];
60 if (ch < '!' && ch != '\n' && ch != '\r' && ch != ' ' && ch != '\t') {
61 break;
62 }
63 if (ch == 'z') {
64 zcount++;
65 } else if (ch > 'u') {
66 break;
67 }
68 pos++;
69 }
70 if (pos == 0) {
71 return 0;
72 }
73 if (zcount > UINT_MAX / 4) {
74 return (FX_DWORD)-1;
75 }
76 if (zcount * 4 > UINT_MAX - (pos - zcount)) {
77 return (FX_DWORD)-1;
78 }
79 dest_buf = FX_Alloc(uint8_t, zcount * 4 + (pos - zcount));
80 int state = 0;
81 uint32_t res = 0;
82 pos = dest_size = 0;
83 while (pos < src_size) {
84 uint8_t ch = src_buf[pos++];
85 if (PDFCharIsLineEnding(ch) || ch == ' ' || ch == '\t')
86 continue;
87
88 if (ch == 'z') {
89 FXSYS_memset(dest_buf + dest_size, 0, 4);
90 state = 0;
91 res = 0;
92 dest_size += 4;
93 } else {
94 if (ch < '!' || ch > 'u') {
95 break;
96 }
97 res = res * 85 + ch - 33;
98 state++;
99 if (state == 5) {
100 for (int i = 0; i < 4; i++) {
101 dest_buf[dest_size++] = (uint8_t)(res >> (3 - i) * 8);
102 }
103 state = 0;
104 res = 0;
105 }
106 }
107 }
108 if (state) {
109 int i;
110 for (i = state; i < 5; i++) {
111 res = res * 85 + 84;
112 }
113 for (i = 0; i < state - 1; i++) {
114 dest_buf[dest_size++] = (uint8_t)(res >> (3 - i) * 8);
115 }
116 }
117 if (pos < src_size && src_buf[pos] == '>') {
118 pos++;
119 }
120 return pos;
121 }
HexDecode(const uint8_t * src_buf,FX_DWORD src_size,uint8_t * & dest_buf,FX_DWORD & dest_size)122 FX_DWORD HexDecode(const uint8_t* src_buf,
123 FX_DWORD src_size,
124 uint8_t*& dest_buf,
125 FX_DWORD& dest_size) {
126 FX_DWORD i;
127 for (i = 0; i < src_size; i++)
128 if (src_buf[i] == '>') {
129 break;
130 }
131 dest_buf = FX_Alloc(uint8_t, i / 2 + 1);
132 dest_size = 0;
133 bool bFirst = true;
134 for (i = 0; i < src_size; i++) {
135 uint8_t ch = src_buf[i];
136 if (PDFCharIsLineEnding(ch) || ch == ' ' || ch == '\t')
137 continue;
138
139 if (ch == '>') {
140 ++i;
141 break;
142 }
143 if (!std::isxdigit(ch))
144 continue;
145
146 int digit = FXSYS_toHexDigit(ch);
147 if (bFirst)
148 dest_buf[dest_size] = digit * 16;
149 else
150 dest_buf[dest_size++] += digit;
151
152 bFirst = !bFirst;
153 }
154 if (!bFirst)
155 dest_size++;
156 return i;
157 }
158
RunLengthDecode(const uint8_t * src_buf,FX_DWORD src_size,uint8_t * & dest_buf,FX_DWORD & dest_size)159 FX_DWORD RunLengthDecode(const uint8_t* src_buf,
160 FX_DWORD src_size,
161 uint8_t*& dest_buf,
162 FX_DWORD& dest_size) {
163 FX_DWORD i = 0;
164 FX_DWORD old;
165 dest_size = 0;
166 while (i < src_size) {
167 if (src_buf[i] < 128) {
168 old = dest_size;
169 dest_size += src_buf[i] + 1;
170 if (dest_size < old) {
171 return (FX_DWORD)-1;
172 }
173 i += src_buf[i] + 2;
174 } else if (src_buf[i] > 128) {
175 old = dest_size;
176 dest_size += 257 - src_buf[i];
177 if (dest_size < old) {
178 return (FX_DWORD)-1;
179 }
180 i += 2;
181 } else {
182 break;
183 }
184 }
185 if (dest_size >= _STREAM_MAX_SIZE_) {
186 return -1;
187 }
188 dest_buf = FX_Alloc(uint8_t, dest_size);
189 i = 0;
190 int dest_count = 0;
191 while (i < src_size) {
192 if (src_buf[i] < 128) {
193 FX_DWORD copy_len = src_buf[i] + 1;
194 FX_DWORD buf_left = src_size - i - 1;
195 if (buf_left < copy_len) {
196 FX_DWORD delta = copy_len - buf_left;
197 copy_len = buf_left;
198 FXSYS_memset(dest_buf + dest_count + copy_len, '\0', delta);
199 }
200 FXSYS_memcpy(dest_buf + dest_count, src_buf + i + 1, copy_len);
201 dest_count += src_buf[i] + 1;
202 i += src_buf[i] + 2;
203 } else if (src_buf[i] > 128) {
204 int fill = 0;
205 if (i < src_size - 1) {
206 fill = src_buf[i + 1];
207 }
208 FXSYS_memset(dest_buf + dest_count, fill, 257 - src_buf[i]);
209 dest_count += 257 - src_buf[i];
210 i += 2;
211 } else {
212 break;
213 }
214 }
215 FX_DWORD ret = i + 1;
216 if (ret > src_size) {
217 ret = src_size;
218 }
219 return ret;
220 }
FPDFAPI_CreateFaxDecoder(const uint8_t * src_buf,FX_DWORD src_size,int width,int height,const CPDF_Dictionary * pParams)221 ICodec_ScanlineDecoder* FPDFAPI_CreateFaxDecoder(
222 const uint8_t* src_buf,
223 FX_DWORD src_size,
224 int width,
225 int height,
226 const CPDF_Dictionary* pParams) {
227 int K = 0;
228 FX_BOOL EndOfLine = FALSE;
229 FX_BOOL ByteAlign = FALSE;
230 FX_BOOL BlackIs1 = FALSE;
231 int Columns = 1728;
232 int Rows = 0;
233 if (pParams) {
234 K = pParams->GetInteger("K");
235 EndOfLine = pParams->GetInteger("EndOfLine");
236 ByteAlign = pParams->GetInteger("EncodedByteAlign");
237 BlackIs1 = pParams->GetInteger("BlackIs1");
238 Columns = pParams->GetInteger("Columns", 1728);
239 Rows = pParams->GetInteger("Rows");
240 if (Rows > USHRT_MAX) {
241 Rows = 0;
242 }
243 if (Columns <= 0 || Rows < 0 || Columns > USHRT_MAX || Rows > USHRT_MAX) {
244 return NULL;
245 }
246 }
247 return CPDF_ModuleMgr::Get()->GetFaxModule()->CreateDecoder(
248 src_buf, src_size, width, height, K, EndOfLine, ByteAlign, BlackIs1,
249 Columns, Rows);
250 }
CheckFlateDecodeParams(int Colors,int BitsPerComponent,int Columns)251 static FX_BOOL CheckFlateDecodeParams(int Colors,
252 int BitsPerComponent,
253 int Columns) {
254 if (Columns < 0) {
255 return FALSE;
256 }
257 int check = Columns;
258 if (Colors < 0 || (check > 0 && Colors > INT_MAX / check)) {
259 return FALSE;
260 }
261 check *= Colors;
262 if (BitsPerComponent < 0 ||
263 (check > 0 && BitsPerComponent > INT_MAX / check)) {
264 return FALSE;
265 }
266 check *= BitsPerComponent;
267 if (check > INT_MAX - 7) {
268 return FALSE;
269 }
270 return TRUE;
271 }
FPDFAPI_CreateFlateDecoder(const uint8_t * src_buf,FX_DWORD src_size,int width,int height,int nComps,int bpc,const CPDF_Dictionary * pParams)272 ICodec_ScanlineDecoder* FPDFAPI_CreateFlateDecoder(
273 const uint8_t* src_buf,
274 FX_DWORD src_size,
275 int width,
276 int height,
277 int nComps,
278 int bpc,
279 const CPDF_Dictionary* pParams) {
280 int predictor = 0;
281 int Colors = 0, BitsPerComponent = 0, Columns = 0;
282 if (pParams) {
283 predictor = pParams->GetInteger("Predictor");
284 Colors = pParams->GetInteger("Colors", 1);
285 BitsPerComponent = pParams->GetInteger("BitsPerComponent", 8);
286 Columns = pParams->GetInteger("Columns", 1);
287 if (!CheckFlateDecodeParams(Colors, BitsPerComponent, Columns)) {
288 return NULL;
289 }
290 }
291 return CPDF_ModuleMgr::Get()->GetFlateModule()->CreateDecoder(
292 src_buf, src_size, width, height, nComps, bpc, predictor, Colors,
293 BitsPerComponent, Columns);
294 }
FPDFAPI_FlateOrLZWDecode(FX_BOOL bLZW,const uint8_t * src_buf,FX_DWORD src_size,CPDF_Dictionary * pParams,FX_DWORD estimated_size,uint8_t * & dest_buf,FX_DWORD & dest_size)295 FX_DWORD FPDFAPI_FlateOrLZWDecode(FX_BOOL bLZW,
296 const uint8_t* src_buf,
297 FX_DWORD src_size,
298 CPDF_Dictionary* pParams,
299 FX_DWORD estimated_size,
300 uint8_t*& dest_buf,
301 FX_DWORD& dest_size) {
302 int predictor = 0;
303 FX_BOOL bEarlyChange = TRUE;
304 int Colors = 0, BitsPerComponent = 0, Columns = 0;
305 if (pParams) {
306 predictor = pParams->GetInteger("Predictor");
307 bEarlyChange = pParams->GetInteger("EarlyChange", 1);
308 Colors = pParams->GetInteger("Colors", 1);
309 BitsPerComponent = pParams->GetInteger("BitsPerComponent", 8);
310 Columns = pParams->GetInteger("Columns", 1);
311 if (!CheckFlateDecodeParams(Colors, BitsPerComponent, Columns)) {
312 return (FX_DWORD)-1;
313 }
314 }
315 return CPDF_ModuleMgr::Get()->GetFlateModule()->FlateOrLZWDecode(
316 bLZW, src_buf, src_size, bEarlyChange, predictor, Colors,
317 BitsPerComponent, Columns, estimated_size, dest_buf, dest_size);
318 }
PDF_DataDecode(const uint8_t * src_buf,FX_DWORD src_size,const CPDF_Dictionary * pDict,uint8_t * & dest_buf,FX_DWORD & dest_size,CFX_ByteString & ImageEncoding,CPDF_Dictionary * & pImageParms,FX_DWORD last_estimated_size,FX_BOOL bImageAcc)319 FX_BOOL PDF_DataDecode(const uint8_t* src_buf,
320 FX_DWORD src_size,
321 const CPDF_Dictionary* pDict,
322 uint8_t*& dest_buf,
323 FX_DWORD& dest_size,
324 CFX_ByteString& ImageEncoding,
325 CPDF_Dictionary*& pImageParms,
326 FX_DWORD last_estimated_size,
327 FX_BOOL bImageAcc) {
328 CPDF_Object* pDecoder = pDict ? pDict->GetElementValue("Filter") : nullptr;
329 if (!pDecoder || (!pDecoder->IsArray() && !pDecoder->IsName()))
330 return FALSE;
331
332 CPDF_Object* pParams =
333 pDict ? pDict->GetElementValue("DecodeParms") : nullptr;
334 CFX_ByteStringArray DecoderList;
335 CFX_ArrayTemplate<CPDF_Object*> ParamList;
336 if (CPDF_Array* pDecoders = pDecoder->AsArray()) {
337 CPDF_Array* pParamsArray = ToArray(pParams);
338 if (!pParamsArray)
339 pParams = nullptr;
340
341 for (FX_DWORD i = 0; i < pDecoders->GetCount(); i++) {
342 CFX_ByteStringC str = pDecoders->GetConstString(i);
343 DecoderList.Add(str);
344 ParamList.Add(pParams ? pParamsArray->GetDict(i) : nullptr);
345 }
346 } else {
347 DecoderList.Add(pDecoder->GetConstString());
348 ParamList.Add(pParams ? pParams->GetDict() : nullptr);
349 }
350 uint8_t* last_buf = (uint8_t*)src_buf;
351 FX_DWORD last_size = src_size;
352 for (int i = 0; i < DecoderList.GetSize(); i++) {
353 int estimated_size =
354 i == DecoderList.GetSize() - 1 ? last_estimated_size : 0;
355 CFX_ByteString decoder = DecoderList[i];
356 // Use ToDictionary here because we can push NULL into the ParamList.
357 CPDF_Dictionary* pParam = ToDictionary(ParamList[i]);
358 uint8_t* new_buf = nullptr;
359 FX_DWORD new_size = (FX_DWORD)-1;
360 int offset = -1;
361 if (decoder == "FlateDecode" || decoder == "Fl") {
362 if (bImageAcc && i == DecoderList.GetSize() - 1) {
363 ImageEncoding = "FlateDecode";
364 dest_buf = (uint8_t*)last_buf;
365 dest_size = last_size;
366 pImageParms = pParam;
367 return TRUE;
368 }
369 offset = FPDFAPI_FlateOrLZWDecode(FALSE, last_buf, last_size, pParam,
370 estimated_size, new_buf, new_size);
371 } else if (decoder == "LZWDecode" || decoder == "LZW") {
372 offset = FPDFAPI_FlateOrLZWDecode(TRUE, last_buf, last_size, pParam,
373 estimated_size, new_buf, new_size);
374 } else if (decoder == "ASCII85Decode" || decoder == "A85") {
375 offset = A85Decode(last_buf, last_size, new_buf, new_size);
376 } else if (decoder == "ASCIIHexDecode" || decoder == "AHx") {
377 offset = HexDecode(last_buf, last_size, new_buf, new_size);
378 } else if (decoder == "RunLengthDecode" || decoder == "RL") {
379 if (bImageAcc && i == DecoderList.GetSize() - 1) {
380 ImageEncoding = "RunLengthDecode";
381 dest_buf = (uint8_t*)last_buf;
382 dest_size = last_size;
383 pImageParms = pParam;
384 return TRUE;
385 }
386 offset = RunLengthDecode(last_buf, last_size, new_buf, new_size);
387 } else if (decoder == "Crypt") {
388 continue;
389 } else {
390 // If we get here, assume it's an image decoder.
391 if (decoder == "DCT") {
392 decoder = "DCTDecode";
393 } else if (decoder == "CCF") {
394 decoder = "CCITTFaxDecode";
395 }
396 ImageEncoding = decoder;
397 pImageParms = pParam;
398 dest_buf = (uint8_t*)last_buf;
399 dest_size = last_size;
400 if (CPDF_Array* pDecoders = pDecoder->AsArray())
401 pDecoders->RemoveAt(i + 1, pDecoders->GetCount() - i - 1);
402 return TRUE;
403 }
404 if (last_buf != src_buf) {
405 FX_Free(last_buf);
406 }
407 if (offset == -1) {
408 FX_Free(new_buf);
409 return FALSE;
410 }
411 last_buf = new_buf;
412 last_size = new_size;
413 }
414 ImageEncoding = "";
415 pImageParms = nullptr;
416 dest_buf = last_buf;
417 dest_size = last_size;
418 return TRUE;
419 }
PDF_DecodeText(const uint8_t * src_data,FX_DWORD src_len,CFX_CharMap * pCharMap)420 CFX_WideString PDF_DecodeText(const uint8_t* src_data,
421 FX_DWORD src_len,
422 CFX_CharMap* pCharMap) {
423 CFX_WideString result;
424 if (src_len >= 2 && ((src_data[0] == 0xfe && src_data[1] == 0xff) ||
425 (src_data[0] == 0xff && src_data[1] == 0xfe))) {
426 FX_BOOL bBE = src_data[0] == 0xfe;
427 FX_DWORD max_chars = (src_len - 2) / 2;
428 if (!max_chars) {
429 return result;
430 }
431 if (src_data[0] == 0xff) {
432 bBE = !src_data[2];
433 }
434 FX_WCHAR* dest_buf = result.GetBuffer(max_chars);
435 const uint8_t* uni_str = src_data + 2;
436 int dest_pos = 0;
437 for (FX_DWORD i = 0; i < max_chars * 2; i += 2) {
438 FX_WORD unicode = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
439 : (uni_str[i + 1] << 8 | uni_str[i]);
440 if (unicode == 0x1b) {
441 i += 2;
442 while (i < max_chars * 2) {
443 FX_WORD unicode = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
444 : (uni_str[i + 1] << 8 | uni_str[i]);
445 i += 2;
446 if (unicode == 0x1b) {
447 break;
448 }
449 }
450 } else {
451 dest_buf[dest_pos++] = unicode;
452 }
453 }
454 result.ReleaseBuffer(dest_pos);
455 } else if (!pCharMap) {
456 FX_WCHAR* dest_buf = result.GetBuffer(src_len);
457 for (FX_DWORD i = 0; i < src_len; i++) {
458 dest_buf[i] = PDFDocEncoding[src_data[i]];
459 }
460 result.ReleaseBuffer(src_len);
461 } else {
462 return (*pCharMap->m_GetWideString)(
463 pCharMap, CFX_ByteString((const FX_CHAR*)src_data, src_len));
464 }
465 return result;
466 }
PDF_EncodeText(const FX_WCHAR * pString,int len,CFX_CharMap * pCharMap)467 CFX_ByteString PDF_EncodeText(const FX_WCHAR* pString,
468 int len,
469 CFX_CharMap* pCharMap) {
470 if (len == -1) {
471 len = FXSYS_wcslen(pString);
472 }
473 CFX_ByteString result;
474 if (!pCharMap) {
475 FX_CHAR* dest_buf1 = result.GetBuffer(len);
476 int i;
477 for (i = 0; i < len; i++) {
478 int code;
479 for (code = 0; code < 256; code++)
480 if (PDFDocEncoding[code] == pString[i]) {
481 break;
482 }
483 if (code == 256) {
484 break;
485 }
486 dest_buf1[i] = code;
487 }
488 result.ReleaseBuffer(i);
489 if (i == len) {
490 return result;
491 }
492 }
493
494 if (len > INT_MAX / 2 - 1) {
495 result.ReleaseBuffer(0);
496 return result;
497 }
498
499 int encLen = len * 2 + 2;
500
501 uint8_t* dest_buf2 = (uint8_t*)result.GetBuffer(encLen);
502 dest_buf2[0] = 0xfe;
503 dest_buf2[1] = 0xff;
504 dest_buf2 += 2;
505 for (int i = 0; i < len; i++) {
506 *dest_buf2++ = pString[i] >> 8;
507 *dest_buf2++ = (uint8_t)pString[i];
508 }
509 result.ReleaseBuffer(encLen);
510 return result;
511 }
PDF_EncodeString(const CFX_ByteString & src,FX_BOOL bHex)512 CFX_ByteString PDF_EncodeString(const CFX_ByteString& src, FX_BOOL bHex) {
513 CFX_ByteTextBuf result;
514 int srclen = src.GetLength();
515 if (bHex) {
516 result.AppendChar('<');
517 for (int i = 0; i < srclen; i++) {
518 result.AppendChar("0123456789ABCDEF"[src[i] / 16]);
519 result.AppendChar("0123456789ABCDEF"[src[i] % 16]);
520 }
521 result.AppendChar('>');
522 return result.GetByteString();
523 }
524 result.AppendChar('(');
525 for (int i = 0; i < srclen; i++) {
526 uint8_t ch = src[i];
527 if (ch == ')' || ch == '\\' || ch == '(') {
528 result.AppendChar('\\');
529 } else if (ch == 0x0a) {
530 result << "\\n";
531 continue;
532 } else if (ch == 0x0d) {
533 result << "\\r";
534 continue;
535 }
536 result.AppendChar(ch);
537 }
538 result.AppendChar(')');
539 return result.GetByteString();
540 }
FlateEncode(const uint8_t * src_buf,FX_DWORD src_size,uint8_t * & dest_buf,FX_DWORD & dest_size)541 void FlateEncode(const uint8_t* src_buf,
542 FX_DWORD src_size,
543 uint8_t*& dest_buf,
544 FX_DWORD& dest_size) {
545 CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
546 if (pEncoders) {
547 pEncoders->GetFlateModule()->Encode(src_buf, src_size, dest_buf, dest_size);
548 }
549 }
FlateEncode(const uint8_t * src_buf,FX_DWORD src_size,int predictor,int Colors,int BitsPerComponent,int Columns,uint8_t * & dest_buf,FX_DWORD & dest_size)550 void FlateEncode(const uint8_t* src_buf,
551 FX_DWORD src_size,
552 int predictor,
553 int Colors,
554 int BitsPerComponent,
555 int Columns,
556 uint8_t*& dest_buf,
557 FX_DWORD& dest_size) {
558 CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
559 if (pEncoders) {
560 pEncoders->GetFlateModule()->Encode(src_buf, src_size, predictor, Colors,
561 BitsPerComponent, Columns, dest_buf,
562 dest_size);
563 }
564 }
FlateDecode(const uint8_t * src_buf,FX_DWORD src_size,uint8_t * & dest_buf,FX_DWORD & dest_size)565 FX_DWORD FlateDecode(const uint8_t* src_buf,
566 FX_DWORD src_size,
567 uint8_t*& dest_buf,
568 FX_DWORD& dest_size) {
569 CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
570 if (pEncoders) {
571 return pEncoders->GetFlateModule()->FlateOrLZWDecode(
572 FALSE, src_buf, src_size, FALSE, 0, 0, 0, 0, 0, dest_buf, dest_size);
573 }
574 return 0;
575 }
576