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comparison src/lzfu.c @ 79:56fa05fd5271

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Patch from Robert Simpson for encryption type 2. Fix the order of testing item types to avoid claiming there are multiple message stores.
author Carl Byington <carl@five-ten-sg.com>
date Fri, 13 Jun 2008 20:47:01 -0700
parents 535075b4d261
children 582e927756d3
comparison
equal deleted inserted replaced
78:535075b4d261 79:56fa05fd5271
38 uint32_t dwMagic; 38 uint32_t dwMagic;
39 uint32_t dwCRC; 39 uint32_t dwCRC;
40 } lzfuheader; 40 } lzfuheader;
41 41
42 42
43 char* lzfu_decompress (char* rtfcomp, uint32_t compsize, size_t *size) { 43 char* lzfu_decompress(char* rtfcomp, uint32_t compsize, size_t *size) {
44 // the dictionary buffer 44 unsigned char dict[4096]; // the dictionary buffer
45 unsigned char dict[4096]; 45 unsigned int dict_length = 0; // the dictionary pointer
46 // the dictionary pointer 46 lzfuheader lzfuhdr; // the header of the lzfu block
47 unsigned int dict_length=0; 47 unsigned char flags; // 8 bits of flags (1=2byte block pointer into the dict, 0=1 byte literal)
48 // the header of the lzfu block 48 unsigned char flag_mask; // look at one flag bit each time thru the loop
49 lzfuheader lzfuhdr;
50 // container for the data blocks
51 unsigned char flags;
52 // temp value for determining the bits in the flag
53 unsigned char flag_mask;
54 uint32_t i; 49 uint32_t i;
55 char *out_buf; 50 char *out_buf;
56 uint32_t out_ptr = 0; 51 uint32_t out_ptr = 0;
57 uint32_t out_size; 52 uint32_t out_size;
58 uint32_t in_ptr; 53 uint32_t in_ptr;
59 uint32_t in_size; 54 uint32_t in_size;
60 55
61 memcpy(dict, LZFU_INITDICT, LZFU_INITLENGTH); 56 memcpy(dict, LZFU_INITDICT, LZFU_INITLENGTH);
57 memset(dict + LZFU_INITLENGTH, 0, sizeof(dict) - LZFU_INITLENGTH);
62 dict_length = LZFU_INITLENGTH; 58 dict_length = LZFU_INITLENGTH;
59
63 memcpy(&lzfuhdr, rtfcomp, sizeof(lzfuhdr)); 60 memcpy(&lzfuhdr, rtfcomp, sizeof(lzfuhdr));
64 LE32_CPU(lzfuhdr.cbSize); 61 LE32_CPU(lzfuhdr.cbSize);
65 LE32_CPU(lzfuhdr.cbRawSize); 62 LE32_CPU(lzfuhdr.cbRawSize);
66 LE32_CPU(lzfuhdr.dwMagic); 63 LE32_CPU(lzfuhdr.dwMagic);
67 LE32_CPU(lzfuhdr.dwCRC); 64 LE32_CPU(lzfuhdr.dwCRC);
97 length = (blkhdr&0x000F)+2; 94 length = (blkhdr&0x000F)+2;
98 // add the value we are about to print to the dictionary 95 // add the value we are about to print to the dictionary
99 for (i=0; i < length; i++) { 96 for (i=0; i < length; i++) {
100 unsigned char c1; 97 unsigned char c1;
101 c1 = dict[(offset+i)%4096]; 98 c1 = dict[(offset+i)%4096];
102 dict[dict_length]=c1; 99 dict[dict_length] = c1;
103 dict_length = (dict_length+1) % 4096; 100 dict_length = (dict_length+1) % 4096;
104 if (out_ptr < out_size) out_buf[out_ptr++] = (char)c1; 101 if (out_ptr < out_size) out_buf[out_ptr++] = (char)c1;
105 // required for dictionary wrap around 102 // required for dictionary wrap around
106 // otherwise 0 byte values are referenced incorrectly 103 // otherwise 0 byte values are referenced incorrectly
107 dict[dict_length] = 0; 104 dict[dict_length] = 0;