netscape-revival
lib/libmsg/m_binhex.c
/* -*- Mode: C; tab-width: 4 -*-
*
* Mac_BinHex.c
* ------------
*
* The decode and encode for BinHex 4.0
*
* 09sep95 mym Created
* 18sep95 mym Added the functions to do encoding from
* the input stream instead of file.
*/
#include "msg.h"
#include "appledbl.h"
#include "m_binhex.h"
#include "ad_codes.h"
/* for XP_GetString() */
#include "xpgetstr.h"
extern int MK_MSG_SAVE_DECODED_AS;
extern int MK_UNABLE_TO_OPEN_TMP_FILE;
extern int MK_MIME_ERROR_WRITING_FILE;
extern int MK_MIME_DATA_CORRUPTED;
static char BinHexTable[64] =
{
0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x30, 0x31, 0x32,
0x33, 0x34, 0x35, 0x36, 0x38, 0x39, 0x40, 0x41,
0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x50, 0x51, 0x52,
0x53, 0x54, 0x55, 0x56, 0x58, 0x59, 0x5a, 0x5b,
0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x68,
0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x70, 0x71, 0x72
};
/*
* The encode for bin hex format.
*/
PRIVATE int binhex_fill_data(
binhex_encode_object* p_bh_encode_obj, char c)
{
int i;
if (p_bh_encode_obj->pos_outbuff >= p_bh_encode_obj->s_outbuff)
{
p_bh_encode_obj->overflow[p_bh_encode_obj->s_overflow++] = c;
}
else
{
p_bh_encode_obj->outbuff[p_bh_encode_obj->pos_outbuff++] =c;
}
if (++p_bh_encode_obj->line_length == 64)
{
/*
** Incase the new line is 2 character. LRCR
*/
for(i = 1; i <= p_bh_encode_obj->newline[0]; i++)
binhex_fill_data(p_bh_encode_obj, p_bh_encode_obj->newline[i]);
p_bh_encode_obj->line_length = 0;
}
return p_bh_encode_obj->s_overflow ? errEOB : NOERR;
}
/************************************************************************
* EncodeDataChar - encode an 8-bit data char into a six-bit buffer
* returns the number of valid encoded characters generated
************************************************************************/
PRIVATE int binhex_encode_data_char(
binhex_encode_object *p_bh_encode_obj,
unsigned char c)
{
int status;
switch (p_bh_encode_obj->state86++)
{
case 0:
status = binhex_fill_data(p_bh_encode_obj,
BinHexTable[(c>>2)&0x3f]);
p_bh_encode_obj->saved_bits = (c&0x3)<<4;
break;
case 1:
status = binhex_fill_data(p_bh_encode_obj,
BinHexTable[p_bh_encode_obj->saved_bits | ((c>>4)&0xf)]);
p_bh_encode_obj->saved_bits = (c&0xf)<<2;
break;
case 2:
status = binhex_fill_data(p_bh_encode_obj,
BinHexTable[p_bh_encode_obj->saved_bits | ((c>>6)&0x3)]);
if (status != NOERR)
break;
status = binhex_fill_data(p_bh_encode_obj,
BinHexTable[c&0x3f]);
p_bh_encode_obj->state86 = 0;
break;
}
return status;
}
#define BYTEMASK 0xff
#define BYTEBIT 0x100
#define WORDMASK 0xffff
#define WORDBIT 0x10000
#define CRCCONSTANT 0x1021
#define WOW { \
c <<= 1; \
if ((temp <<= 1) & WORDBIT) \
temp = (temp & WORDMASK) ^ CRCCONSTANT; \
temp ^= (c >> 8); \
c &= BYTEMASK; \
}
PRIVATE void binhex_comp_q_crc_out(
binhex_encode_object *p_bh_encode_obj, uint16 c)
{
register uint32 temp = p_bh_encode_obj->CRC;
WOW;
WOW;
WOW;
WOW;
WOW;
WOW;
WOW;
WOW;
p_bh_encode_obj->CRC = temp;
}
PRIVATE int binhex_encode_buff(
binhex_encode_object *p_bh_encode_obj,
unsigned char* data,
int size)
{
int i, status;
unsigned char dc;
for (i = 0; i < size; i++)
{
dc = *data++;
status = binhex_encode_data_char(p_bh_encode_obj, dc);
if ((char)dc == (char)0x90)
status = binhex_encode_data_char(p_bh_encode_obj, 0);
if (status != NOERR)
break;
binhex_comp_q_crc_out(p_bh_encode_obj, dc); /* and compute the CRC too */
}
return status;
}
PRIVATE int binhex_encode_end_a_part(
binhex_encode_object* p_bh_encode_obj)
{
int status;
uint16 tempCrc;
/*
** write the CRC to the encode.
*/
binhex_comp_q_crc_out(p_bh_encode_obj, 0);
binhex_comp_q_crc_out(p_bh_encode_obj, 0);
tempCrc = (uint16)(p_bh_encode_obj->CRC & 0xffff);
tempCrc = htons(tempCrc);
status = binhex_encode_buff(p_bh_encode_obj,
(unsigned char*)&tempCrc,
sizeof(uint16));
p_bh_encode_obj->CRC = 0;
return status;
}
PRIVATE int binhex_encode_finishing(
binhex_encode_object *p_bh_encode_obj)
{
int i, status = 0;
if (p_bh_encode_obj->state86)
status = binhex_encode_buff(p_bh_encode_obj, (unsigned char*)&status, 1);
/*
** The close token.
*/
status = binhex_fill_data(p_bh_encode_obj, ':');
for (i=1; i <= p_bh_encode_obj->newline[0]; i++)
status = binhex_fill_data(p_bh_encode_obj,
p_bh_encode_obj->newline[i]);
return errDone;
}
int binhex_encode_init(binhex_encode_object *p_bh_encode_obj)
{
/*
** init all the status.
*/
XP_MEMSET(p_bh_encode_obj, 0, sizeof(binhex_encode_object));
p_bh_encode_obj->line_length = 1;
p_bh_encode_obj->newline[0] = 2;
p_bh_encode_obj->newline[1] = CR;
p_bh_encode_obj->newline[2] = LF; /* to confirm with rfc822, use CRLF */
return NOERR;
}
int binhex_encode_next(
binhex_encode_object* p_bh_encode_obj,
char *in_buff,
int32 in_size,
char *out_buff,
int32 buff_size,
int32 *real_size)
{
int status;
/*
** setup the buffer information.
*/
p_bh_encode_obj->outbuff = out_buff;
p_bh_encode_obj->s_outbuff = buff_size;
p_bh_encode_obj->pos_outbuff = 0;
/*
** copy over the left over from last time.
*/
if (p_bh_encode_obj->s_overflow)
{
XP_MEMCPY(p_bh_encode_obj->overflow,
p_bh_encode_obj->outbuff,
p_bh_encode_obj->s_overflow);
p_bh_encode_obj->pos_outbuff = p_bh_encode_obj->s_overflow;
p_bh_encode_obj->s_overflow = 0;
}
/*
** Jump to the right state.
*/
if ( p_bh_encode_obj->state < BINHEX_STATE_DONE)
{
if (in_buff == NULL && in_size == 0)
{
/* this is our special token of end of a part, time to append crc codes */
if (p_bh_encode_obj->state != BINHEX_STATE_FINISH)
status = binhex_encode_end_a_part(p_bh_encode_obj);
else
status = binhex_encode_finishing(p_bh_encode_obj);
p_bh_encode_obj->state += 2; /* so we can jump to the next state.*/
}
else
{
if (p_bh_encode_obj->state == BINHEX_STATE_START)
{
XP_STRCPY(p_bh_encode_obj->outbuff + p_bh_encode_obj->pos_outbuff,
"\r\n(This file must be converted with BinHex 4.0)\r\n\r\n:");
p_bh_encode_obj->pos_outbuff += 52;
p_bh_encode_obj->state = BINHEX_STATE_HEADER;
XP_MEMCPY(p_bh_encode_obj->name,
in_buff,
in_size);
}
else if (p_bh_encode_obj->state == BINHEX_STATE_HEADER)
{
XP_MEMCPY(&(p_bh_encode_obj->head),
in_buff,
sizeof(binhex_header));
if (in_size == 20) /* in the platform that alignment is 4-bytes. */
in_size = 18;
p_bh_encode_obj->head.dlen = 0; /* we just can't trust the dlen from */
/* apple double decoder told us. */
/* do our own counting. */
}
else if (p_bh_encode_obj->state == BINHEX_STATE_DFORK)
{
if (p_bh_encode_obj->head.dlen == 0)
{
p_bh_encode_obj->c[0] = in_buff[0]; /* save the first 2 bytes, in case */
p_bh_encode_obj->c[1] = in_buff[1]; /* head and data share 1 code block */
}
p_bh_encode_obj->head.dlen += in_size;
}
status = binhex_encode_buff(p_bh_encode_obj,
(unsigned char *)in_buff,
in_size);
}
}
*real_size = p_bh_encode_obj->pos_outbuff;
return status;
}
/*
** Only generate the header part of the encoding,
** so we can fix up the
*/
int binhex_reencode_head(
binhex_encode_object *p_bh_encode_obj,
char* outbuff,
int32 buff_size,
int32* real_size)
{
int32 size, dlen;
int status;
char buff[64];
p_bh_encode_obj->state = 0;
p_bh_encode_obj->state86 = 0;
p_bh_encode_obj->CRC = 0;
p_bh_encode_obj->line_length= 1;
p_bh_encode_obj->saved_bits = 0;
p_bh_encode_obj->s_overflow = 0 ;
status = binhex_encode_next(
p_bh_encode_obj,
p_bh_encode_obj->name,
p_bh_encode_obj->name[0]+2, /* in_size */
outbuff,
buff_size,
real_size);
if (status != NOERR)
return status;
size = *real_size;
/* now we should have the right data length in the head structure, but don't */
/* forget convert it back to the net byte order (i.e., Motolora) before write it */
/* */
/* Note: since we don't change the size of rlen, so don't need to worry about it */
p_bh_encode_obj->head.dlen = htonl(dlen = p_bh_encode_obj->head.dlen);
/* make a copy before do the encoding, -- it may modify the head!!!. */
XP_MEMCPY(buff, (char*)&p_bh_encode_obj->head,
sizeof(binhex_header));
if (18 < sizeof(binhex_header))
{
/* we get an alignment problem here. */
XP_MEMCPY(buff + 10, buff + 12, 8);
}
status = binhex_encode_next(
p_bh_encode_obj,
(char*)buff,
18, /* sizeof(binhex_header),*/
outbuff + size,
buff_size - size,
real_size);
if (status != NOERR)
return status;
size += *real_size;
status = binhex_encode_next( /* for CRC */
p_bh_encode_obj,
NULL,
0, /* in_size */
outbuff + size,
buff_size - size,
real_size);
if (status != NOERR)
return status;
size += *real_size;
if (p_bh_encode_obj->state86 != 0)
{
/*
** Make sure we don't destroy the orignal valid coding.
**
** (Keep in mind that 3 characters share 4 coding chars,
** so it is possible for the head and data stream share one 4 code group.
**
** How about only one or zero character in the data fork?
** ---- just rerun the encoding, not a big deal.
*/
if (dlen <= 1)
{
/* why just rerun the encoding once more. */
status = binhex_encode_next(
p_bh_encode_obj,
p_bh_encode_obj->c,
dlen,
outbuff + size,
buff_size - size,
real_size);
if (status != NOERR)
return status;
size += *real_size; /* encode the data fork */
status = binhex_encode_next(
p_bh_encode_obj,
NULL,
0,
outbuff + size,
buff_size - size,
real_size);
if (status != NOERR)
return status;
size += *real_size; /* for the end up data fork */
status = binhex_encode_next(
p_bh_encode_obj,
NULL,
0,
outbuff + size,
buff_size - size,
real_size); /* for the end up encoding*/
}
else
{
status = binhex_encode_next(
p_bh_encode_obj,
p_bh_encode_obj->c,
3 - p_bh_encode_obj->state86, /* in_size */
outbuff + size,
buff_size - size,
real_size);
}
size += *real_size;
}
*real_size = size;
return status;
}
int binhex_encode_end (
binhex_encode_object *p_bh_encode_obj,
XP_Bool is_aborting)
{
return NOERR;
}
/*
** The decode's.
*/
static char binhex_decode[256] =
{
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, -1, -1,
13, 14, 15, 16, 17, 18, 19, -1, 20, 21, -1, -1, -1, -1, -1, -1,
22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, -1,
37, 38, 39, 40, 41, 42, 43, -1, 44, 45, 46, 47, -1, -1, -1, -1,
48, 49, 50, 51, 52, 53, 54, -1, 55, 56, 57, 58, 59, 60, -1, -1,
61, 62, 63, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
};
#define BHEXVAL(c) (binhex_decode[(unsigned char) c])
/*
** the decode for bin hex format.
*/
int binhex_decode_init (
binhex_decode_object *p_bh_decode_obj,
MWContext *context)
{
XP_MEMSET(p_bh_decode_obj, 0, sizeof(binhex_decode_object));
p_bh_decode_obj->octetin = 26;
p_bh_decode_obj->donepos = 3;
p_bh_decode_obj->context = context;
return NOERR;
}
static void
simple_copy(MWContext* context, char* newFile, void* closure)
{
XP_STRCPY((char *)closure, newFile);
}
PRIVATE void binhex_process(
binhex_decode_object *p_bh_decode_obj)
{
int32 status;
uint16 tmpcrc, cval;
unsigned char ctmp, c = p_bh_decode_obj->rlebuf;
/* do CRC */
ctmp = p_bh_decode_obj->inCRC ? c : 0;
cval = p_bh_decode_obj->CRC & 0xf000;
tmpcrc = ((uint16) (p_bh_decode_obj->CRC << 4) |
(ctmp >> 4))
^ (cval | (cval >> 7) |
(cval >> 12));
cval = tmpcrc & 0xf000;
p_bh_decode_obj->CRC = ((uint16) (tmpcrc << 4) |
(ctmp & 0x0f))
^ (cval | (cval >> 7) |
(cval >> 12));
/* handle state */
switch (p_bh_decode_obj->state)
{
case BINHEX_STATE_START:
p_bh_decode_obj->state = BINHEX_STATE_FNAME;
p_bh_decode_obj->count = 1;
#ifndef XP_MAC
p_bh_decode_obj->name = XP_ALLOC(64);
#endif
*(p_bh_decode_obj->name) = (c & 63);
break;
case BINHEX_STATE_FNAME:
p_bh_decode_obj->name[p_bh_decode_obj->count] = c;
if (p_bh_decode_obj->count++ > *(p_bh_decode_obj->name))
{
#if 0
char* p;
/* convert it to the c-string too. */
c = *(p_bh_decode_obj->name);
p = p_bh_decode_obj->name;
while (c--)
{
*p = *(p+1); p++;
}
*p = '\0';
#endif
p_bh_decode_obj->state = BINHEX_STATE_HEADER;
p_bh_decode_obj->count = 0;
}
break;
case BINHEX_STATE_HEADER:
((char *)&p_bh_decode_obj->head)[p_bh_decode_obj->count] = c;
if (++p_bh_decode_obj->count == 18)
{
#ifndef XP_MAC
if (sizeof(binhex_header) != 18) /* fix the alignment problem in some OS */
{
char *p = (char *)&p_bh_decode_obj->head;
p += 19;
for (c = 0; c < 8; c++)
{
*p = *(p-2); p--;
}
}
#endif
p_bh_decode_obj->state = BINHEX_STATE_HCRC;
p_bh_decode_obj->inCRC = 1;
p_bh_decode_obj->count = 0;
}
break;
case BINHEX_STATE_DFORK:
case BINHEX_STATE_RFORK:
p_bh_decode_obj->outbuff[p_bh_decode_obj->pos_outbuff++] = c;
if (-- p_bh_decode_obj->count == 0)
{
#ifdef XP_MAC
long howMuch = p_bh_decode_obj->pos_outbuff;
status = FSWrite(p_bh_decode_obj->fileId,
&howMuch,
p_bh_decode_obj->outbuff);
FSClose(p_bh_decode_obj->fileId);
#else
/* only output data fork in the non-mac system. */
if (p_bh_decode_obj->state == BINHEX_STATE_DFORK)
{
status = XP_FileWrite(p_bh_decode_obj->outbuff,
p_bh_decode_obj->pos_outbuff,
p_bh_decode_obj->fileId)
== p_bh_decode_obj->pos_outbuff ? NOERR : errFileWrite;
XP_FileClose(p_bh_decode_obj->fileId);
}
else
{
status = NOERR; /* do nothing for resource fork. */
}
#endif
p_bh_decode_obj->pos_outbuff = 0;
if (status != NOERR)
p_bh_decode_obj->state = status;
else
{
p_bh_decode_obj->state ++;
p_bh_decode_obj->fileId = 0;
}
p_bh_decode_obj->inCRC = 1;
}
else if (p_bh_decode_obj->pos_outbuff >= MAX_BUFF_SIZE)
{
#ifdef XP_MAC
long howMuch = p_bh_decode_obj->pos_outbuff;
status = FSWrite(p_bh_decode_obj->fileId,
&howMuch,
p_bh_decode_obj->outbuff);
#else
if (p_bh_decode_obj->state == BINHEX_STATE_DFORK)
{
status = XP_FileWrite(p_bh_decode_obj->outbuff,
p_bh_decode_obj->pos_outbuff,
p_bh_decode_obj->fileId)
== p_bh_decode_obj->pos_outbuff ? NOERR : errFileWrite;
}
else
{
status = NOERR; /* don't care about the resource fork. */
}
#endif
if (status != NOERR)
p_bh_decode_obj->state = status;
p_bh_decode_obj->pos_outbuff = 0;
}
break;
case BINHEX_STATE_HCRC:
case BINHEX_STATE_DCRC:
case BINHEX_STATE_RCRC:
if (!p_bh_decode_obj->count++)
{
p_bh_decode_obj->fileCRC = (unsigned short) c << 8;
}
else
{
if ((p_bh_decode_obj->fileCRC | c) != p_bh_decode_obj->CRC)
{
if (p_bh_decode_obj->state > BINHEX_STATE_HCRC)
{
#ifdef XP_MAC
HDelete(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char*)p_bh_decode_obj->name);
#else
XP_FileRemove(p_bh_decode_obj->name, xpURL);
#endif
}
p_bh_decode_obj->state = errDecoding;
break;
}
/*
** passed the CRC check!!!
*/
p_bh_decode_obj->CRC = 0;
if (++ p_bh_decode_obj->state == BINHEX_STATE_FINISH)
{
#ifdef XP_MAC
FInfo finfo;
/* set back the file information.before we declare done ! */
finfo.fdType = p_bh_decode_obj->head.type;
finfo.fdCreator = p_bh_decode_obj->head.creator;
finfo.fdFlags = p_bh_decode_obj->head.flags & 0xf800;
HSetFInfo(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char *)p_bh_decode_obj->name,
&finfo);
#endif
/* now We are done with everything. */
p_bh_decode_obj->state++;
break;
}
if (p_bh_decode_obj->state == BINHEX_STATE_DFORK)
{
#ifdef XP_MAC
StandardFileReply reply;
StandardPutFile("\pSave decoded file as:",
(unsigned char *)p_bh_decode_obj->name,
&reply);
if (!reply.sfGood)
{
p_bh_decode_obj->state = errUsrCancel;
break;
}
XP_MEMCPY(p_bh_decode_obj->name,
reply.sfFile.name,
*(reply.sfFile.name)+1); /* save the new file name. */
p_bh_decode_obj->vRefNum = reply.sfFile.vRefNum;
p_bh_decode_obj->parID = reply.sfFile.parID;
HDelete(reply.sfFile.vRefNum,
reply.sfFile.parID,
reply.sfFile.name);
status = HCreate(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
reply.sfFile.name,
p_bh_decode_obj->head.creator,
p_bh_decode_obj->head.type);
#else /* non-mac OS case */
char* filename;
filename = XP_ALLOC(1024);
if (filename == NULL ||
FE_PromptForFileName(p_bh_decode_obj->context,
XP_GetString(MK_MSG_SAVE_DECODED_AS),
0,
FALSE,
FALSE,
simple_copy,
filename) == -1)
{
FREEIF(filename);
p_bh_decode_obj->state = errUsrCancel;
break;
}
FREEIF(p_bh_decode_obj->name);
p_bh_decode_obj->name = XP_STRDUP(filename);
p_bh_decode_obj->fileId
= XP_FileOpen(filename,
xpURL,
XP_FILE_TRUNCATE_BIN);
if (p_bh_decode_obj->fileId == NULL)
status = errFileOpen;
else
status = NOERR;
XP_FREE(filename);
#endif
if (status != NOERR)
p_bh_decode_obj->state = status;
p_bh_decode_obj->count
= ntohl(p_bh_decode_obj->head.dlen);
}
else
{
p_bh_decode_obj->count
= ntohl(p_bh_decode_obj->head.rlen); /* it should in host byte order */
}
if (p_bh_decode_obj->count)
{
p_bh_decode_obj->inCRC = 0;
#ifdef XP_MAC
if (p_bh_decode_obj->state == BINHEX_STATE_DFORK)
status = HOpen(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char*)p_bh_decode_obj->name,
fsWrPerm,
&(p_bh_decode_obj->fileId));
else
status = HOpenRF(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char*)p_bh_decode_obj->name,
fsWrPerm,
&(p_bh_decode_obj->fileId));
if (status != NOERR)
{
p_bh_decode_obj->state = errFileOpen;
HDelete(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char*)p_bh_decode_obj->name);
break;
}
#else
/* for None Mac OS -- nothing is required, file already open. */
#endif
}
else
{
/* nothing inside, so skip to the next state. */
p_bh_decode_obj->state ++;
}
}
break;
}
return;
}
static int get_next_char(binhex_decode_object *p_bh_decode_obj)
{
char c = 0;
while (p_bh_decode_obj->pos_inbuff < p_bh_decode_obj->s_inbuff)
{
c = p_bh_decode_obj->inbuff[p_bh_decode_obj->pos_inbuff++];
if (c != LF && c != CR)
break;
}
return (c == LF || c == CR) ? 0 : (int) c;
}
int binhex_decode_next (
binhex_decode_object *p_bh_decode_obj,
const char *in_buff,
int32 buff_size)
{
int found_start;
int octetpos, c;
uint32 val;
/*
** reset the buff first.
*/
p_bh_decode_obj->inbuff = (char*)in_buff;
p_bh_decode_obj->s_inbuff = buff_size;
p_bh_decode_obj->pos_inbuff = 0;
/*
** if it is the first time, seek to the right start place.
*/
if (p_bh_decode_obj->state == BINHEX_STATE_START)
{
found_start = FALSE;
/*
** go through the line, until we get a ':'
*/
while (p_bh_decode_obj->pos_inbuff < p_bh_decode_obj->s_inbuff)
{
c = p_bh_decode_obj->inbuff[p_bh_decode_obj->pos_inbuff++];
while (c == CR || c == LF)
{
if (p_bh_decode_obj->pos_inbuff >= p_bh_decode_obj->s_inbuff)
break;
c = p_bh_decode_obj->inbuff[p_bh_decode_obj->pos_inbuff++];
if (c == ':')
{
found_start = TRUE;
break;
}
}
if (found_start) break; /* we got the start point. */
}
if (p_bh_decode_obj->pos_inbuff >= p_bh_decode_obj->s_inbuff)
return NOERR; /* we meet buff end before we get the */
/* start point, wait till next fills. */
if (c != ':')
return errDecoding; /* can't find the start character. */
}
/*
** run - through the in-stream now.
*/
while (p_bh_decode_obj->state >= 0 &&
p_bh_decode_obj->state < BINHEX_STATE_DONE)
{
/* fill in octetbuf */
do
{
if (p_bh_decode_obj->pos_inbuff >= p_bh_decode_obj->s_inbuff)
return NOERR; /* end of buff, go on for the nxet calls. */
c = get_next_char(p_bh_decode_obj);
if (c == 0)
return NOERR;
if ((val = BHEXVAL(c)) == -1)
{
/*
** we incount an invalid character.
*/
if (c)
{
/*
** rolling back.
*/
p_bh_decode_obj->donepos --;
if (p_bh_decode_obj->octetin >= 14) p_bh_decode_obj->donepos--;
if (p_bh_decode_obj->octetin >= 20) p_bh_decode_obj->donepos--;
}
break;
}
p_bh_decode_obj->octetbuf.val |= val << p_bh_decode_obj->octetin;
}
while ((p_bh_decode_obj->octetin -= 6) > 2);
/* handle decoded characters -- run length encoding (rle) detection */
#ifndef XP_MAC
p_bh_decode_obj->octetbuf.val
= ntohl(p_bh_decode_obj->octetbuf.val);
#endif
for (octetpos = 0; octetpos < p_bh_decode_obj->donepos; ++octetpos)
{
c = p_bh_decode_obj->octetbuf.c[octetpos];
if (c == 0x90 && !p_bh_decode_obj->marker++)
continue;
if (p_bh_decode_obj->marker)
{
if (c == 0)
{
p_bh_decode_obj->rlebuf = 0x90;
binhex_process(p_bh_decode_obj);
}
else
{
while (--c > 0) /* we are in the run lenght mode */
{
binhex_process(p_bh_decode_obj);
}
}
p_bh_decode_obj->marker = 0;
}
else
{
p_bh_decode_obj->rlebuf = (unsigned char) c;
binhex_process(p_bh_decode_obj);
}
if (p_bh_decode_obj->state >= BINHEX_STATE_FINISH)
break;
}
/* prepare for next 3 characters. */
if (p_bh_decode_obj->donepos < 3 && p_bh_decode_obj->state < BINHEX_STATE_FINISH)
p_bh_decode_obj->state = errDecoding;
p_bh_decode_obj->octetin = 26;
p_bh_decode_obj->octetbuf.val = 0;
}
/*
** Error clean-ups
*/
if (p_bh_decode_obj->state < 0 && p_bh_decode_obj->fileId)
{
#ifdef XP_MAC
FSClose(p_bh_decode_obj->fileId);
p_bh_decode_obj->fileId = 0;
HDelete(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char*)p_bh_decode_obj->name);
#else
XP_FileClose(p_bh_decode_obj->fileId);
p_bh_decode_obj->fileId = 0;
XP_FileRemove(p_bh_decode_obj->name, xpURL);
#endif
}
return p_bh_decode_obj->state < 0 ? (p_bh_decode_obj->state) :
p_bh_decode_obj->state >= BINHEX_STATE_FINISH ? errDone : NOERR;
}
int binhex_decode_end (
binhex_decode_object *p_bh_decode_obj,
XP_Bool is_aborting)
{
#ifdef XP_MAC
if (p_bh_decode_obj->fileId)
{
FSClose(p_bh_decode_obj->fileId);
p_bh_decode_obj->fileId = 0;
if (is_aborting)
{
HDelete(p_bh_decode_obj->vRefNum,
p_bh_decode_obj->parID,
(unsigned char*)p_bh_decode_obj->name);
}
}
#else
if (p_bh_decode_obj->fileId)
{
XP_FileClose(p_bh_decode_obj->fileId);
p_bh_decode_obj->fileId = NULL;
if (is_aborting)
XP_FileRemove(p_bh_decode_obj->name, xpURL);
}
FREEIF(p_bh_decode_obj->name);
#endif
return NOERR;
}