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annotate src/lzfu.c @ 331:c5e7f13d2836

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author Carl Byington <carl@five-ten-sg.com>
date Thu, 25 Jul 2013 11:12:57 -0700
parents cf3df962f1e5
children 5c0ce43c7532
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1 /*
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2 This program is free software; you can redistribute it and/or modify
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3 it under the terms of the GNU General Public License as published by
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4 the Free Software Foundation; either version 2 of the License, or
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5 (at your option) any later version.
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6
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7 You should have received a copy of the GNU General Public License
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8 along with this program; if not, write to the Free Software Foundation,
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9 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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10 */
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11
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12 #include "define.h"
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13 #include "lzfu.h"
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15
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16 #define LZFU_COMPRESSED 0x75465a4c
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17 #define LZFU_UNCOMPRESSED 0x414c454d
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19 // initital dictionary
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20 #define LZFU_INITDICT "{\\rtf1\\ansi\\mac\\deff0\\deftab720{\\fonttbl;}" \
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21 "{\\f0\\fnil \\froman \\fswiss \\fmodern \\fscrip" \
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22 "t \\fdecor MS Sans SerifSymbolArialTimes Ne" \
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23 "w RomanCourier{\\colortbl\\red0\\green0\\blue0" \
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24 "\r\n\\par \\pard\\plain\\f0\\fs20\\b\\i\\u\\tab" \
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25 "\\tx"
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26 // initial length of dictionary
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27 #define LZFU_INITLENGTH 207
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28
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29 // header for compressed rtf
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30 typedef struct _lzfuheader {
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31 uint32_t cbSize;
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32 uint32_t cbRawSize;
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33 uint32_t dwMagic;
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34 uint32_t dwCRC;
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35 } lzfuheader;
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38 char* pst_lzfu_decompress(char* rtfcomp, uint32_t compsize, size_t *size) {
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39 unsigned char dict[4096]; // the dictionary buffer
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40 unsigned int dict_length = 0; // the dictionary pointer
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41 lzfuheader lzfuhdr; // the header of the lzfu block
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42 unsigned char flags; // 8 bits of flags (1=2byte block pointer into the dict, 0=1 byte literal)
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43 unsigned char flag_mask; // look at one flag bit each time thru the loop
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44 uint32_t i;
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45 char *out_buf;
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46 uint32_t out_ptr = 0;
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47 uint32_t out_size;
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48 uint32_t in_ptr;
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49 uint32_t in_size;
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50
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51 memcpy(dict, LZFU_INITDICT, LZFU_INITLENGTH);
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52 memset(dict + LZFU_INITLENGTH, 0, sizeof(dict) - LZFU_INITLENGTH);
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53 dict_length = LZFU_INITLENGTH;
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54
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55 memcpy(&lzfuhdr, rtfcomp, sizeof(lzfuhdr));
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56 LE32_CPU(lzfuhdr.cbSize);
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57 LE32_CPU(lzfuhdr.cbRawSize);
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58 LE32_CPU(lzfuhdr.dwMagic);
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59 LE32_CPU(lzfuhdr.dwCRC);
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60 //printf("total size: %d\n", lzfuhdr.cbSize+4);
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61 //printf("raw size : %d\n", lzfuhdr.cbRawSize);
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62 //printf("compressed: %s\n", (lzfuhdr.dwMagic == LZFU_COMPRESSED ? "yes" : "no"));
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63 //printf("CRC : %#x\n", lzfuhdr.dwCRC);
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64 //printf("\n");
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65 out_size = lzfuhdr.cbRawSize;
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66 out_buf = (char*)pst_malloc(out_size);
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67 in_ptr = sizeof(lzfuhdr);
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68 // Make sure to correct lzfuhdr.cbSize with 4 bytes before comparing
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69 // to compsize
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70 in_size = (lzfuhdr.cbSize + 4 < compsize) ? lzfuhdr.cbSize + 4 : compsize;
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71 while (in_ptr < in_size) {
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72 flags = (unsigned char)(rtfcomp[in_ptr++]);
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73 flag_mask = 1;
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74 while (flag_mask) {
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75 if (flag_mask & flags) {
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76 // two bytes available?
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77 if (in_ptr+1 < in_size) {
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78 // read 2 bytes from input
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79 uint16_t blkhdr, offset, length;
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80 memcpy(&blkhdr, rtfcomp+in_ptr, 2);
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81 LE16_CPU(blkhdr);
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82 in_ptr += 2;
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83 /* swap the upper and lower bytes of blkhdr */
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84 blkhdr = (((blkhdr&0xFF00)>>8)+
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85 ((blkhdr&0x00FF)<<8));
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86 /* the offset is the first 12 bits of the 16 bit value */
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87 offset = (blkhdr&0xFFF0)>>4;
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88 /* the length of the dict entry are the last 4 bits */
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89 length = (blkhdr&0x000F)+2;
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90 // add the value we are about to print to the dictionary
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91 for (i=0; i < length; i++) {
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92 unsigned char c1;
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93 c1 = dict[(offset+i)%4096];
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94 dict[dict_length] = c1;
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95 dict_length = (dict_length+1) % 4096;
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96 if (out_ptr < out_size) out_buf[out_ptr++] = (char)c1;
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97 // required for dictionary wrap around
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98 // otherwise 0 byte values are referenced incorrectly
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99 dict[dict_length] = 0;
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100 }
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101 }
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102 } else {
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103 // one byte available?
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104 if (in_ptr < in_size) {
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105 // uncompressed chunk (single byte)
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106 char c1 = rtfcomp[in_ptr++];
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107 dict[dict_length] = c1;
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108 dict_length = (dict_length+1)%4096;
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109 if (out_ptr < out_size) out_buf[out_ptr++] = (char)c1;
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110 // required for dictionary wrap around
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111 // otherwise 0 byte values are referenced incorrect
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112 dict[dict_length] = 0;
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113 }
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114 }
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115 flag_mask <<= 1;
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116 }
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117 }
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118 *size = out_ptr;
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119 return out_buf;
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120 }