// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#include "core/fpdfapi/fpdf_parser/include/fpdf_parser_decode.h"
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#include <limits.h>
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#include <utility>
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#include <vector>
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#include "core/fpdfapi/fpdf_parser/fpdf_parser_utility.h"
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#include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
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#include "core/fpdfapi/fpdf_parser/include/cpdf_dictionary.h"
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#include "core/fpdfapi/include/cpdf_modulemgr.h"
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#include "core/fxcodec/include/fx_codec.h"
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#include "core/fxcrt/include/fx_ext.h"
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#include "third_party/base/stl_util.h"
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#define _STREAM_MAX_SIZE_ 20 * 1024 * 1024
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const uint16_t PDFDocEncoding[256] = {
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0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, 0x0008,
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0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f, 0x0010, 0x0011,
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0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017, 0x02d8, 0x02c7, 0x02c6,
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0x02d9, 0x02dd, 0x02db, 0x02da, 0x02dc, 0x0020, 0x0021, 0x0022, 0x0023,
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0x0024, 0x0025, 0x0026, 0x0027, 0x0028, 0x0029, 0x002a, 0x002b, 0x002c,
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0x002d, 0x002e, 0x002f, 0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035,
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0x0036, 0x0037, 0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e,
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0x003f, 0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
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0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f, 0x0050,
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0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057, 0x0058, 0x0059,
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0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f, 0x0060, 0x0061, 0x0062,
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0x0063, 0x0064, 0x0065, 0x0066, 0x0067, 0x0068, 0x0069, 0x006a, 0x006b,
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0x006c, 0x006d, 0x006e, 0x006f, 0x0070, 0x0071, 0x0072, 0x0073, 0x0074,
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0x0075, 0x0076, 0x0077, 0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d,
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0x007e, 0x0000, 0x2022, 0x2020, 0x2021, 0x2026, 0x2014, 0x2013, 0x0192,
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0x2044, 0x2039, 0x203a, 0x2212, 0x2030, 0x201e, 0x201c, 0x201d, 0x2018,
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0x2019, 0x201a, 0x2122, 0xfb01, 0xfb02, 0x0141, 0x0152, 0x0160, 0x0178,
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0x017d, 0x0131, 0x0142, 0x0153, 0x0161, 0x017e, 0x0000, 0x20ac, 0x00a1,
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0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7, 0x00a8, 0x00a9, 0x00aa,
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0x00ab, 0x00ac, 0x0000, 0x00ae, 0x00af, 0x00b0, 0x00b1, 0x00b2, 0x00b3,
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0x00b4, 0x00b5, 0x00b6, 0x00b7, 0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc,
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0x00bd, 0x00be, 0x00bf, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5,
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0x00c6, 0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
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0x00cf, 0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
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0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df, 0x00e0,
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0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7, 0x00e8, 0x00e9,
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0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef, 0x00f0, 0x00f1, 0x00f2,
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0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7, 0x00f8, 0x00f9, 0x00fa, 0x00fb,
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0x00fc, 0x00fd, 0x00fe, 0x00ff};
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uint32_t A85Decode(const uint8_t* src_buf,
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uint32_t src_size,
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uint8_t*& dest_buf,
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uint32_t& dest_size) {
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dest_size = 0;
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dest_buf = nullptr;
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if (src_size == 0)
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return 0;
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// Count legal characters and zeros.
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uint32_t zcount = 0;
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uint32_t pos = 0;
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while (pos < src_size) {
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uint8_t ch = src_buf[pos];
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if (ch == 'z') {
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zcount++;
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} else if ((ch < '!' || ch > 'u') && !PDFCharIsLineEnding(ch) &&
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ch != ' ' && ch != '\t') {
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break;
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}
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pos++;
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}
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// No content to decode.
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if (pos == 0)
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return 0;
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// Count the space needed to contain non-zero characters. The encoding ratio
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// of Ascii85 is 4:5.
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uint32_t space_for_non_zeroes = (pos - zcount) / 5 * 4 + 4;
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if (zcount > (UINT_MAX - space_for_non_zeroes) / 4) {
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return (uint32_t)-1;
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}
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dest_buf = FX_Alloc(uint8_t, zcount * 4 + space_for_non_zeroes);
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size_t state = 0;
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uint32_t res = 0;
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pos = dest_size = 0;
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while (pos < src_size) {
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uint8_t ch = src_buf[pos++];
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if (PDFCharIsLineEnding(ch) || ch == ' ' || ch == '\t')
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continue;
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if (ch == 'z') {
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FXSYS_memset(dest_buf + dest_size, 0, 4);
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state = 0;
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res = 0;
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dest_size += 4;
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} else if (ch >= '!' && ch <= 'u') {
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res = res * 85 + ch - 33;
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state++;
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if (state == 5) {
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for (size_t i = 0; i < 4; i++) {
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dest_buf[dest_size++] = (uint8_t)(res >> (3 - i) * 8);
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}
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state = 0;
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res = 0;
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}
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} else {
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// The end or illegal character.
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break;
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}
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}
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// Handle partial group.
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if (state) {
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for (size_t i = state; i < 5; i++)
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res = res * 85 + 84;
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for (size_t i = 0; i < state - 1; i++)
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dest_buf[dest_size++] = (uint8_t)(res >> (3 - i) * 8);
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}
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if (pos < src_size && src_buf[pos] == '>')
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pos++;
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return pos;
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}
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uint32_t HexDecode(const uint8_t* src_buf,
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uint32_t src_size,
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uint8_t*& dest_buf,
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uint32_t& dest_size) {
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dest_size = 0;
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if (src_size == 0) {
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dest_buf = nullptr;
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return 0;
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}
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uint32_t i = 0;
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// Find the end of data.
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while (i < src_size && src_buf[i] != '>')
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i++;
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dest_buf = FX_Alloc(uint8_t, i / 2 + 1);
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bool bFirst = true;
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for (i = 0; i < src_size; i++) {
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uint8_t ch = src_buf[i];
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if (PDFCharIsLineEnding(ch) || ch == ' ' || ch == '\t')
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continue;
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if (ch == '>') {
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++i;
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break;
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}
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if (!std::isxdigit(ch))
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continue;
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int digit = FXSYS_toHexDigit(ch);
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if (bFirst)
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dest_buf[dest_size] = digit * 16;
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else
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dest_buf[dest_size++] += digit;
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bFirst = !bFirst;
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}
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if (!bFirst)
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dest_size++;
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return i;
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}
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uint32_t RunLengthDecode(const uint8_t* src_buf,
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uint32_t src_size,
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uint8_t*& dest_buf,
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uint32_t& dest_size) {
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uint32_t i = 0;
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uint32_t old;
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dest_size = 0;
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while (i < src_size) {
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if (src_buf[i] < 128) {
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old = dest_size;
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dest_size += src_buf[i] + 1;
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if (dest_size < old)
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return FX_INVALID_OFFSET;
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i += src_buf[i] + 2;
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} else if (src_buf[i] > 128) {
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old = dest_size;
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dest_size += 257 - src_buf[i];
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if (dest_size < old)
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return FX_INVALID_OFFSET;
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i += 2;
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} else {
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break;
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}
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}
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if (dest_size >= _STREAM_MAX_SIZE_)
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return FX_INVALID_OFFSET;
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dest_buf = FX_Alloc(uint8_t, dest_size);
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i = 0;
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int dest_count = 0;
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while (i < src_size) {
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if (src_buf[i] < 128) {
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uint32_t copy_len = src_buf[i] + 1;
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uint32_t buf_left = src_size - i - 1;
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if (buf_left < copy_len) {
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uint32_t delta = copy_len - buf_left;
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copy_len = buf_left;
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FXSYS_memset(dest_buf + dest_count + copy_len, '\0', delta);
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}
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FXSYS_memcpy(dest_buf + dest_count, src_buf + i + 1, copy_len);
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dest_count += src_buf[i] + 1;
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i += src_buf[i] + 2;
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} else if (src_buf[i] > 128) {
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int fill = 0;
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if (i < src_size - 1) {
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fill = src_buf[i + 1];
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}
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FXSYS_memset(dest_buf + dest_count, fill, 257 - src_buf[i]);
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dest_count += 257 - src_buf[i];
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i += 2;
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} else {
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break;
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}
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}
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uint32_t ret = i + 1;
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if (ret > src_size) {
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ret = src_size;
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}
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return ret;
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}
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CCodec_ScanlineDecoder* FPDFAPI_CreateFaxDecoder(
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const uint8_t* src_buf,
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uint32_t src_size,
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int width,
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int height,
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const CPDF_Dictionary* pParams) {
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int K = 0;
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FX_BOOL EndOfLine = FALSE;
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FX_BOOL ByteAlign = FALSE;
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FX_BOOL BlackIs1 = FALSE;
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int Columns = 1728;
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int Rows = 0;
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if (pParams) {
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K = pParams->GetIntegerBy("K");
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EndOfLine = pParams->GetIntegerBy("EndOfLine");
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ByteAlign = pParams->GetIntegerBy("EncodedByteAlign");
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BlackIs1 = pParams->GetIntegerBy("BlackIs1");
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Columns = pParams->GetIntegerBy("Columns", 1728);
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Rows = pParams->GetIntegerBy("Rows");
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if (Rows > USHRT_MAX) {
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Rows = 0;
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}
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if (Columns <= 0 || Rows < 0 || Columns > USHRT_MAX || Rows > USHRT_MAX) {
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return nullptr;
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}
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}
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return CPDF_ModuleMgr::Get()->GetFaxModule()->CreateDecoder(
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src_buf, src_size, width, height, K, EndOfLine, ByteAlign, BlackIs1,
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Columns, Rows);
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}
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static FX_BOOL CheckFlateDecodeParams(int Colors,
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int BitsPerComponent,
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int Columns) {
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if (Columns < 0) {
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return FALSE;
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}
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int check = Columns;
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if (Colors < 0 || (check > 0 && Colors > INT_MAX / check)) {
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return FALSE;
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}
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check *= Colors;
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if (BitsPerComponent < 0 ||
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(check > 0 && BitsPerComponent > INT_MAX / check)) {
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return FALSE;
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}
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check *= BitsPerComponent;
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if (check > INT_MAX - 7) {
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return FALSE;
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}
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return TRUE;
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}
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CCodec_ScanlineDecoder* FPDFAPI_CreateFlateDecoder(
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const uint8_t* src_buf,
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uint32_t src_size,
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int width,
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int height,
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int nComps,
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int bpc,
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const CPDF_Dictionary* pParams) {
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int predictor = 0;
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int Colors = 0, BitsPerComponent = 0, Columns = 0;
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if (pParams) {
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predictor = pParams->GetIntegerBy("Predictor");
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Colors = pParams->GetIntegerBy("Colors", 1);
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BitsPerComponent = pParams->GetIntegerBy("BitsPerComponent", 8);
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Columns = pParams->GetIntegerBy("Columns", 1);
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if (!CheckFlateDecodeParams(Colors, BitsPerComponent, Columns)) {
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return nullptr;
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}
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}
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return CPDF_ModuleMgr::Get()->GetFlateModule()->CreateDecoder(
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src_buf, src_size, width, height, nComps, bpc, predictor, Colors,
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BitsPerComponent, Columns);
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}
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uint32_t FPDFAPI_FlateOrLZWDecode(FX_BOOL bLZW,
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const uint8_t* src_buf,
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uint32_t src_size,
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CPDF_Dictionary* pParams,
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uint32_t estimated_size,
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uint8_t*& dest_buf,
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uint32_t& dest_size) {
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int predictor = 0;
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FX_BOOL bEarlyChange = TRUE;
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int Colors = 0, BitsPerComponent = 0, Columns = 0;
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if (pParams) {
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predictor = pParams->GetIntegerBy("Predictor");
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bEarlyChange = pParams->GetIntegerBy("EarlyChange", 1);
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Colors = pParams->GetIntegerBy("Colors", 1);
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BitsPerComponent = pParams->GetIntegerBy("BitsPerComponent", 8);
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Columns = pParams->GetIntegerBy("Columns", 1);
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if (!CheckFlateDecodeParams(Colors, BitsPerComponent, Columns)) {
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return (uint32_t)-1;
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}
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}
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return CPDF_ModuleMgr::Get()->GetFlateModule()->FlateOrLZWDecode(
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bLZW, src_buf, src_size, bEarlyChange, predictor, Colors,
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BitsPerComponent, Columns, estimated_size, dest_buf, dest_size);
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}
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FX_BOOL PDF_DataDecode(const uint8_t* src_buf,
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uint32_t src_size,
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const CPDF_Dictionary* pDict,
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uint8_t*& dest_buf,
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uint32_t& dest_size,
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CFX_ByteString& ImageEncoding,
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CPDF_Dictionary*& pImageParms,
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uint32_t last_estimated_size,
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FX_BOOL bImageAcc) {
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CPDF_Object* pDecoder = pDict ? pDict->GetDirectObjectBy("Filter") : nullptr;
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if (!pDecoder || (!pDecoder->IsArray() && !pDecoder->IsName()))
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return FALSE;
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CPDF_Object* pParams =
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pDict ? pDict->GetDirectObjectBy("DecodeParms") : nullptr;
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std::vector<std::pair<CFX_ByteString, CPDF_Object*>> DecoderArray;
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if (CPDF_Array* pDecoders = pDecoder->AsArray()) {
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CPDF_Array* pParamsArray = ToArray(pParams);
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for (size_t i = 0; i < pDecoders->GetCount(); i++) {
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DecoderArray.push_back(
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{pDecoders->GetStringAt(i),
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pParamsArray ? pParamsArray->GetDictAt(i) : nullptr});
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}
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} else {
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DecoderArray.push_back(
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{pDecoder->GetString(), pParams ? pParams->GetDict() : nullptr});
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}
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uint8_t* last_buf = const_cast<uint8_t*>(src_buf);
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uint32_t last_size = src_size;
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int nSize = pdfium::CollectionSize<int>(DecoderArray);
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for (int i = 0; i < nSize; i++) {
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int estimated_size = i == nSize - 1 ? last_estimated_size : 0;
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CFX_ByteString decoder = DecoderArray[i].first;
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CPDF_Dictionary* pParam = ToDictionary(DecoderArray[i].second);
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uint8_t* new_buf = nullptr;
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uint32_t new_size = (uint32_t)-1;
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int offset = -1;
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if (decoder == "FlateDecode" || decoder == "Fl") {
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if (bImageAcc && i == nSize - 1) {
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ImageEncoding = "FlateDecode";
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dest_buf = (uint8_t*)last_buf;
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dest_size = last_size;
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pImageParms = pParam;
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return TRUE;
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}
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offset = FPDFAPI_FlateOrLZWDecode(FALSE, last_buf, last_size, pParam,
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estimated_size, new_buf, new_size);
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} else if (decoder == "LZWDecode" || decoder == "LZW") {
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offset = FPDFAPI_FlateOrLZWDecode(TRUE, last_buf, last_size, pParam,
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estimated_size, new_buf, new_size);
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} else if (decoder == "ASCII85Decode" || decoder == "A85") {
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offset = A85Decode(last_buf, last_size, new_buf, new_size);
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} else if (decoder == "ASCIIHexDecode" || decoder == "AHx") {
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offset = HexDecode(last_buf, last_size, new_buf, new_size);
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} else if (decoder == "RunLengthDecode" || decoder == "RL") {
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if (bImageAcc && i == nSize - 1) {
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ImageEncoding = "RunLengthDecode";
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dest_buf = (uint8_t*)last_buf;
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dest_size = last_size;
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pImageParms = pParam;
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return TRUE;
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}
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offset = RunLengthDecode(last_buf, last_size, new_buf, new_size);
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} else if (decoder == "Crypt") {
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continue;
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} else {
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// If we get here, assume it's an image decoder.
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if (decoder == "DCT") {
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decoder = "DCTDecode";
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} else if (decoder == "CCF") {
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decoder = "CCITTFaxDecode";
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}
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ImageEncoding = decoder;
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pImageParms = pParam;
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dest_buf = (uint8_t*)last_buf;
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dest_size = last_size;
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if (CPDF_Array* pDecoders = pDecoder->AsArray())
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pDecoders->RemoveAt(i + 1, pDecoders->GetCount() - i - 1);
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return TRUE;
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}
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if (last_buf != src_buf) {
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FX_Free(last_buf);
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}
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if (offset == -1) {
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FX_Free(new_buf);
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return FALSE;
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}
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last_buf = new_buf;
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last_size = new_size;
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}
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ImageEncoding = "";
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pImageParms = nullptr;
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dest_buf = last_buf;
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dest_size = last_size;
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return TRUE;
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}
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CFX_WideString PDF_DecodeText(const uint8_t* src_data, uint32_t src_len) {
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CFX_WideString result;
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if (src_len >= 2 && ((src_data[0] == 0xfe && src_data[1] == 0xff) ||
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(src_data[0] == 0xff && src_data[1] == 0xfe))) {
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bool bBE = src_data[0] == 0xfe;
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uint32_t max_chars = (src_len - 2) / 2;
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if (!max_chars) {
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return result;
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}
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if (src_data[0] == 0xff) {
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bBE = !src_data[2];
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}
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FX_WCHAR* dest_buf = result.GetBuffer(max_chars);
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const uint8_t* uni_str = src_data + 2;
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int dest_pos = 0;
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for (uint32_t i = 0; i < max_chars * 2; i += 2) {
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uint16_t unicode = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
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: (uni_str[i + 1] << 8 | uni_str[i]);
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if (unicode == 0x1b) {
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i += 2;
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while (i < max_chars * 2) {
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uint16_t unicode2 = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
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: (uni_str[i + 1] << 8 | uni_str[i]);
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i += 2;
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if (unicode2 == 0x1b)
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break;
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}
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} else {
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dest_buf[dest_pos++] = unicode;
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}
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}
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result.ReleaseBuffer(dest_pos);
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} else {
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FX_WCHAR* dest_buf = result.GetBuffer(src_len);
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for (uint32_t i = 0; i < src_len; i++)
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dest_buf[i] = PDFDocEncoding[src_data[i]];
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result.ReleaseBuffer(src_len);
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}
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return result;
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}
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CFX_WideString PDF_DecodeText(const CFX_ByteString& bstr) {
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return PDF_DecodeText((const uint8_t*)bstr.c_str(), bstr.GetLength());
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}
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CFX_ByteString PDF_EncodeText(const FX_WCHAR* pString, int len) {
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if (len == -1) {
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len = FXSYS_wcslen(pString);
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}
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CFX_ByteString result;
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FX_CHAR* dest_buf1 = result.GetBuffer(len);
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int i;
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for (i = 0; i < len; i++) {
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int code;
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for (code = 0; code < 256; code++)
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if (PDFDocEncoding[code] == pString[i]) {
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break;
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}
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if (code == 256) {
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break;
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}
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dest_buf1[i] = code;
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}
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result.ReleaseBuffer(i);
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if (i == len) {
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return result;
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}
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if (len > INT_MAX / 2 - 1) {
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result.ReleaseBuffer(0);
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return result;
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}
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int encLen = len * 2 + 2;
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uint8_t* dest_buf2 = (uint8_t*)result.GetBuffer(encLen);
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dest_buf2[0] = 0xfe;
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dest_buf2[1] = 0xff;
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dest_buf2 += 2;
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for (int j = 0; j < len; j++) {
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*dest_buf2++ = pString[i] >> 8;
|
*dest_buf2++ = (uint8_t)pString[j];
|
}
|
result.ReleaseBuffer(encLen);
|
return result;
|
}
|
|
CFX_ByteString PDF_EncodeText(const CFX_WideString& str) {
|
return PDF_EncodeText(str.c_str(), str.GetLength());
|
}
|
|
CFX_ByteString PDF_EncodeString(const CFX_ByteString& src, FX_BOOL bHex) {
|
CFX_ByteTextBuf result;
|
int srclen = src.GetLength();
|
if (bHex) {
|
result.AppendChar('<');
|
for (int i = 0; i < srclen; i++) {
|
result.AppendChar("0123456789ABCDEF"[src[i] / 16]);
|
result.AppendChar("0123456789ABCDEF"[src[i] % 16]);
|
}
|
result.AppendChar('>');
|
return result.MakeString();
|
}
|
result.AppendChar('(');
|
for (int i = 0; i < srclen; i++) {
|
uint8_t ch = src[i];
|
if (ch == 0x0a) {
|
result << "\\n";
|
continue;
|
}
|
if (ch == 0x0d) {
|
result << "\\r";
|
continue;
|
}
|
if (ch == ')' || ch == '\\' || ch == '(')
|
result.AppendChar('\\');
|
result.AppendChar(ch);
|
}
|
result.AppendChar(')');
|
return result.MakeString();
|
}
|
|
bool FlateEncode(const uint8_t* src_buf,
|
uint32_t src_size,
|
uint8_t** dest_buf,
|
uint32_t* dest_size) {
|
CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
|
return pEncoders &&
|
pEncoders->GetFlateModule()->Encode(src_buf, src_size, dest_buf,
|
dest_size);
|
}
|
|
bool PngEncode(const uint8_t* src_buf,
|
uint32_t src_size,
|
uint8_t** dest_buf,
|
uint32_t* dest_size) {
|
CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
|
return pEncoders &&
|
pEncoders->GetFlateModule()->PngEncode(src_buf, src_size, dest_buf,
|
dest_size);
|
}
|
|
uint32_t FlateDecode(const uint8_t* src_buf,
|
uint32_t src_size,
|
uint8_t*& dest_buf,
|
uint32_t& dest_size) {
|
CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
|
if (pEncoders) {
|
return pEncoders->GetFlateModule()->FlateOrLZWDecode(
|
FALSE, src_buf, src_size, FALSE, 0, 0, 0, 0, 0, dest_buf, dest_size);
|
}
|
return 0;
|
}
|
