libpst: src/lzfu.c annotate

annotate src/lzfu.c @ 51:06c0262ad689 stable-0-6-5

code cleanup

author	carl
date	Tue, 22 Jan 2008 14:39:02 -0800
parents	f66078abed38
children	3cb02cb1e6cd

rev	line source
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	1 /*
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	2 This program is free software; you can redistribute it and/or modify
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	3 it under the terms of the GNU General Public License as published by
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	4 the Free Software Foundation; either version 2 of the License, or
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	5 (at your option) any later version.
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	6
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	7 You should have received a copy of the GNU General Public License
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	8 along with this program; if not, write to the Free Software Foundation,
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	9 Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	10 */
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	11
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	12 #include "define.h"
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	13 #include "libpst.h"
48 f66078abed38 more fixes for 64 bit format carl parents: 43 diff changeset	14
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	15 #include <sys/types.h>
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	16 #include <string.h>
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	17 #include <stdio.h>
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	18
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	19 #include "lzfu.h"
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	20
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	21 #define LZFU_COMPRESSED 0x75465a4c
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	22 #define LZFU_UNCOMPRESSED 0x414c454d
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	23
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	24 // initital dictionary
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	25 #define LZFU_INITDICT "{\\rtf1\\ansi\\mac\\deff0\\deftab720{\\fonttbl;}" \
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	26 "{\\f0\\fnil \\froman \\fswiss \\fmodern \\fscrip" \
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	27 "t \\fdecor MS Sans SerifSymbolArialTimes Ne" \
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	28 "w RomanCourier{\\colortbl\\red0\\green0\\blue0" \
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	29 "\r\n\\par \\pard\\plain\\f0\\fs20\\b\\i\\u\\tab" \
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	30 "\\tx"
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	31 // initial length of dictionary
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	32 #define LZFU_INITLENGTH 207
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	33
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	34 // header for compressed rtf
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	35 typedef struct _lzfuheader {
43 f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	36 uint32_t cbSize;
f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	37 uint32_t cbRawSize;
f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	38 uint32_t dwMagic;
f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	39 uint32_t dwCRC;
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	40 } lzfuheader;
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	41
c508ee15dfca switch to automake/autoconf carl parents: diff changeset	42
43 f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	43 unsigned char* lzfu_decompress (unsigned char* rtfcomp, uint32_t compsize, size_t *size) {
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	44 // the dictionary buffer
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	45 unsigned char dict[4096];
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	46 // the dictionary pointer
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	47 unsigned int dict_length=0;
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	48 // the header of the lzfu block
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	49 lzfuheader lzfuhdr;
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	50 // container for the data blocks
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	51 unsigned char flags;
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	52 // temp value for determining the bits in the flag
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	53 unsigned char flag_mask;
43 f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	54 uint32_t i;
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	55 unsigned char *out_buf;
43 f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	56 uint32_t out_ptr = 0;
f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	57 uint32_t out_size;
f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	58 uint32_t in_ptr;
f6db1f060a95 start on outlook 2003 64 bit format carl parents: 41 diff changeset	59 uint32_t in_size;
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	60
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	61 memcpy(dict, LZFU_INITDICT, LZFU_INITLENGTH);
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	62 dict_length = LZFU_INITLENGTH;
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	63 memcpy(&lzfuhdr, rtfcomp, sizeof(lzfuhdr));
37 ddfb25318812 more valgrind fixes carl parents: 36 diff changeset	64 LE32_CPU(lzfuhdr.cbSize);
ddfb25318812 more valgrind fixes carl parents: 36 diff changeset	65 LE32_CPU(lzfuhdr.cbRawSize);
ddfb25318812 more valgrind fixes carl parents: 36 diff changeset	66 LE32_CPU(lzfuhdr.dwMagic);
ddfb25318812 more valgrind fixes carl parents: 36 diff changeset	67 LE32_CPU(lzfuhdr.dwCRC);
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	68 //printf("total size: %d\n", lzfuhdr.cbSize+4);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	69 //printf("raw size : %d\n", lzfuhdr.cbRawSize);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	70 //printf("compressed: %s\n", (lzfuhdr.dwMagic == LZFU_COMPRESSED ? "yes" : "no"));
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	71 //printf("CRC : %#x\n", lzfuhdr.dwCRC);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	72 //printf("\n");
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	73 out_size = lzfuhdr.cbRawSize + 3; // two braces and a null terminator
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	74 out_buf = (unsigned char*)xmalloc(out_size);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	75 in_ptr = sizeof(lzfuhdr);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	76 in_size = (lzfuhdr.cbSize < compsize) ? lzfuhdr.cbSize : compsize;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	77 while (in_ptr < in_size) {
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	78 flags = rtfcomp[in_ptr++];
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	79 flag_mask = 1;
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	80 while (flag_mask) {
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	81 if (flag_mask & flags) {
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	82 // two bytes available?
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	83 if (in_ptr+1 < in_size) {
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	84 // read 2 bytes from input
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	85 unsigned short int blkhdr, offset, length;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	86 memcpy(&blkhdr, rtfcomp+in_ptr, 2);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	87 LE16_CPU(blkhdr);
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	88 in_ptr += 2;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	89 /* swap the upper and lower bytes of blkhdr */
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	90 blkhdr = (((blkhdr&0xFF00)>>8)+
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	91 ((blkhdr&0x00FF)<<8));
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	92 /* the offset is the first 12 bits of the 16 bit value */
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	93 offset = (blkhdr&0xFFF0)>>4;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	94 /* the length of the dict entry are the last 4 bits */
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	95 length = (blkhdr&0x000F)+2;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	96 // add the value we are about to print to the dictionary
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	97 for (i=0; i < length; i++) {
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	98 unsigned char c1;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	99 c1 = dict[(offset+i)%4096];
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	100 dict[dict_length]=c1;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	101 dict_length = (dict_length+1) % 4096;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	102 if (out_ptr < out_size) out_buf[out_ptr++] = c1;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	103 }
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	104 }
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	105 } else {
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	106 // one byte available?
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	107 if (in_ptr < in_size) {
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	108 // uncompressed chunk (single byte)
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	109 char c1 = rtfcomp[in_ptr++];
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	110 dict[dict_length] = c1;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	111 dict_length = (dict_length+1)%4096;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	112 if (out_ptr < out_size) out_buf[out_ptr++] = c1;
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	113 }
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	114 }
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	115 flag_mask <<= 1;
6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	116 }
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	117 }
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	118 // the compressed version doesn't appear to drop the closing
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	119 // braces onto the doc, so we do that here.
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	120 if (out_ptr < out_size) out_buf[out_ptr++] = '}';
183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	121 if (out_ptr < out_size) out_buf[out_ptr++] = '}';
37 ddfb25318812 more valgrind fixes carl parents: 36 diff changeset	122 *size = out_ptr;
41 183ae993b9ad security fix for potential buffer overrun in lz decompress carl parents: 37 diff changeset	123 if (out_ptr < out_size) out_buf[out_ptr++] = '\0';
36 6fe121a971c9 valgrind fixes carl parents: 16 diff changeset	124 return out_buf;
16 c508ee15dfca switch to automake/autoconf carl parents: diff changeset	125 }

Mercurial > libpst

annotate src/lzfu.c @ 51:06c0262ad689 stable-0-6-5