144 lines
5.3 KiB
C++
144 lines
5.3 KiB
C++
/*
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* CiderPress
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* Copyright (C) 2007 by faddenSoft, LLC. All Rights Reserved.
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* See the file LICENSE for distribution terms.
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*/
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/*
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* Special handling for files on CP/M disks.
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*/
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#include "StdAfx.h"
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#include "CPMFiles.h"
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const int kCtrlZ = 0x1a; // end-of-file indicator
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/*
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* Table determining what's a binary character and what isn't. This is
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* roughly the same table as is used in GenericArchive.cpp. The code will
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* additionally allow Ctrl-Z, and will allow occurrences of 0x00 that appear
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* after the Ctrl-Z.
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*
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* Even if we don't allow high ASCII, we must still allow 0xe5 if it occurs
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* after a Ctrl-Z.
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*
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* After looking at the generic ISO-latin-1 table, Paul Schlyter writes:
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* -----
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* Remove 88, 89, 8A, 8C and 8D as well from this table. The CP/M version of
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* Wordstar uses the hi bit of any character for its own uses - for instance
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* 0D 0A is a "soft end-of-line" which Wordstar can move around, while 8D 8A is
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* a "hard end-of-line" which WordStar does not move around. Other characters
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* can have this bit used to signal hilighted text. On a lot of CP/M systems
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* the hi bit is ignored when displaying characters (= sending the characters to
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* the standard console output), thus one can often "type" a WordStar file and
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* have it displayed as readable text.
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* -----
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*/
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static const char gIsBinary[256] = {
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1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, /* ^@-^O */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* ^P-^_ */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* - / */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0 - ? */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* @ - O */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* P - _ */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* ` - o */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, /* p - DEL */
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1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, /* 0x80 */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, /* 0x90 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xa0 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xb0 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xc0 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xd0 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xe0 */
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* 0xf0 */
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};
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/*
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* Decide whether or not this is a CP/M text file.
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*
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* End-of-file is at the first Ctrl-Z, but we can't stop there because it
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* could be a binary file with a leading Ctrl-Z (e.g. PNG).
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*/
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void ReformatCPMText::Examine(ReformatHolder* pHolder)
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{
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ReformatHolder::ReformatApplies applies = ReformatHolder::kApplicNot;
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const uint8_t* ptr = pHolder->GetSourceBuf(ReformatHolder::kPartData);
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long fileLen = pHolder->GetSourceLen(ReformatHolder::kPartData);
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const char* nameExt = pHolder->GetNameExt();
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bool foundCtrlZ = false;
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/* only show this on CP/M disks */
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if (pHolder->GetSourceFormat() != ReformatHolder::kSourceFormatCPM)
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goto done;
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applies = ReformatHolder::kApplicProbablyNot;
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/* allow, but don't default to, text conversion of ".com" files */
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if (stricmp(nameExt, ".com") == 0) {
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LOGI("Not reformatting '.com' file as text");
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goto done;
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}
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/*
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* Scan file, looking for illegal chars.
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*
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* Thought for the day: could also require that Ctrl-Z appear in the
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* last 128 bytes of the file. May want to count all high-ASCII values
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* as illegal but allow a certain percentage of "illegal" characters in
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* the mix.
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*/
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while (fileLen--) {
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if (*ptr == kCtrlZ) {
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foundCtrlZ = true;
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} else if (foundCtrlZ && *ptr == 0x00) {
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/* do nothing -- 0x00 is okay if it comes after Ctrl-Z */
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} else {
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if (gIsBinary[*ptr]) {
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LOGI("CP/M found binary char 0x%02x at offset 0x%04x",
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*ptr,
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ptr - pHolder->GetSourceBuf(ReformatHolder::kPartData));
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break;
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}
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}
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ptr++;
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}
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if (fileLen == -1)
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applies = ReformatHolder::kApplicProbably;
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done:
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pHolder->SetApplic(ReformatHolder::kReformatCPMText, applies,
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ReformatHolder::kApplicNot, ReformatHolder::kApplicNot);
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}
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/*
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* Convert EOL markers.
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*
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* The primary difference between "CP/M text" and other formats is that we
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* stop on the first occurrence of Ctrl-Z.
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*
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* Generally speaking, CP/M text files should already be in CRLF format, so
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* this will go quickly.
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*/
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int ReformatCPMText::Process(const ReformatHolder* pHolder,
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ReformatHolder::ReformatID id, ReformatHolder::ReformatPart part,
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ReformatOutput* pOutput)
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{
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const uint8_t* srcBuf = pHolder->GetSourceBuf(part);
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long srcLen = pHolder->GetSourceLen(part);
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fUseRTF = false;
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if (pHolder->GetSourceLen(part) == 0)
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return -1;
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for (long ll = 0; ll < srcLen; ll++) {
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if (*srcBuf == kCtrlZ /*|| *srcBuf == '\0'*/) {
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srcLen = ll;
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break;
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}
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srcBuf++;
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}
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ConvertEOL(pHolder->GetSourceBuf(part), srcLen, true);
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SetResultBuffer(pOutput);
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return 0;
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}
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