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gbdk-releases/sdcc/packihx/packihx.c
Michael Hope 09a290dd78 Imported gbdk-2.96a.
2015-01-10 16:25:09 +01:00

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/*-----------------------------------------------------------------------
* packihx.c:
*
* utility to pack an Intel HEX format file by removing redundant
* extended offset records and accumulating data records up to
* OUTPUT_CHUNK (currently 16) bytes.
*
* Released to the public domain 10/16/2000 Kevin Vigor.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>
#if defined(_MSC_VER)
typedef unsigned char Uint8 ;
typedef unsigned Uint16 ;
#else
#include "config.h"
#endif
/* A cooked line of input. */
typedef struct _Line
{
Uint8 len; /* length of data portion of record. */
Uint16 offset;
Uint8 type;
Uint8 *data;
Uint8 checksum;
} Line;
/* Largest expected line of raw input. */
#define MAX_INPUT_RAW 128
/* Largest expected cooked data portion of an input line. */
#define MAX_INPUT_COOKED (MAX_INPUT_RAW / 2)
/* Globals: current input & output line numbers. */
int lineno = 0;
int outlineno = 0;
/* Convert hex digit to numeric value 0 - 15; assumes input is a
* valid digit (i.e. passes isxdigit()).
*/
static Uint8 hexDigit(const char c)
{
if (isdigit(c))
{
return (Uint8)(c - '0');
}
else
{
return (Uint8)((islower(c) ? toupper(c) : c) - 'A' + 10);
}
}
/* Convert two hex digits from cp to a byte value. */
static int getHexByte(const char *cp, Uint8 *byte)
{
if (cp && cp[0] && isxdigit(cp[0]) && cp[1] && isxdigit(cp[1]))
{
*byte = (hexDigit(cp[0]) << 4) + hexDigit(cp[1]);
}
else
{
return -1;
}
return 0;
}
/* Convert four hex digits from cp to a 2 byte value. */
static int getHexWord(const char *cp, Uint16 *word)
{
Uint8 byte1, byte2;
if (getHexByte(cp, &byte1) || getHexByte(cp + 2, &byte2))
{
return -1;
}
*word = (byte1 << 8) + byte2;
return 0;
}
/* Return a single cooked line of input from the passed file handle. */
Line *readLine(FILE *inFile)
{
static char buffer[MAX_INPUT_RAW];
const char *bp;
Line *line;
unsigned i;
line = (Line *)malloc(sizeof(Line));
if (!line)
{
fprintf(stderr, "packihx: no memory!\n");
return NULL;
}
do
{
if (!fgets(buffer, MAX_INPUT_RAW, inFile))
{
return NULL;
}
++lineno;
if (!buffer[0] || buffer[0] == '\r' || buffer[0] == '\n')
{
/* Empty input line. */
return NULL;
}
} while (buffer[0] != ':');
bp = buffer;
bp++; /* Skip leading : */
if (getHexByte(bp, &line->len))
{
fprintf(stderr, "packihx: can't read line length @ line %d\n",
lineno);
free(line);
return NULL;
}
bp += 2; /* Two digits consumed. */
if (line->len > MAX_INPUT_COOKED)
{
fprintf(stderr, "packihx: line length %X too long @ line %d\n",
(int)line->len, lineno);
free(line);
return NULL;
}
if (getHexWord(bp, &line->offset))
{
fprintf(stderr, "packihx: can't read line offset @ line %d\n",
lineno);
free(line);
return NULL;
}
bp += 4; /* Four digits consumed. */
if (getHexByte(bp, &line->type))
{
fprintf(stderr, "packihx: can't read record type @ line %d\n",
lineno);
free(line);
return NULL;
}
bp += 2; /* Two digits consumed. */
/* Hack - always allocate something, even if len is zero.
* Avoids special case for len == 0. */
line->data = (Uint8 *)malloc(line->len ? line->len : 1);
if (!line->data)
{
free(line);
fprintf(stderr, "packihx: no memory!\n");
return NULL;
}
for (i = 0; i < (unsigned)line->len; i++)
{
if (getHexByte(bp, &(line->data[i])))
{
fprintf(stderr,
"packihx: can't read data byte %u of %u @ line %d\n",
i, (unsigned) line->len, lineno);
free(line->data);
free(line);
return NULL;
}
bp += 2; /* Two digits consumed. */
}
if (getHexByte(bp, &line->checksum))
{
fprintf(stderr, "packihx: can't read checksum @ line %d\n",
lineno);
free(line->data);
free(line);
return NULL;
}
/* bp += 2; */ /* Two digits consumed. */
return line;
}
/* Compute the checksum of a line. */
Uint16 lineChecksum(unsigned len, unsigned offset, unsigned type,
const Uint8 *data)
{
Uint16 checksum;
unsigned i;
checksum = len + type + (offset >> 8) +
(offset & 0xff);
for (i = 0; i < len; i++)
{
checksum += data[i];
}
checksum &= 0xff;
if (checksum)
{
checksum = 0x100 - checksum;
}
return checksum;
}
/* Ensure that the checksum of a line matches the expected value. */
int validateChecksum(Line *line)
{
Uint16 checksum;
checksum = lineChecksum(line->len, line->offset, line->type, line->data);
if (checksum != line->checksum)
{
fprintf(stderr, "packihx: invalid checksum %X (want %X) @ line %d\n",
(unsigned)checksum, (unsigned)(line->checksum),
lineno);
return -1;
}
return 0;
}
/* Write a single record line. */
int writeRecord(unsigned len, unsigned offset, unsigned type,
const Uint8 *data)
{
unsigned i;
if (printf(":%02X%04X%02X", len, offset, type) == EOF)
{
return -1;
}
for (i = 0; i < len; i++)
{
if (printf("%02X", data[i]) == EOF)
{
return -1;
}
}
if (printf("%02X\n", lineChecksum(len, offset, type, data)) == EOF)
{
return -1;
}
outlineno++;
return 0;
}
#define OUTPUT_CHUNK 16
static unsigned pendingLen = 0;
static unsigned pendingOffset = 0;
static char pending[MAX_INPUT_COOKED + OUTPUT_CHUNK];
/* Buffer up a data record. */
int bufferOutput(Line *line)
{
unsigned offset = 0;
int rc = 0;
/* Stick the data onto any pending data. */
assert(pendingLen < OUTPUT_CHUNK);
memcpy(&pending[pendingLen], line->data, line->len);
pendingLen += line->len;
/* Write it out untill we have less than an OUTPUT_CHUNK left. */
while (!rc && pendingLen >= OUTPUT_CHUNK)
{
rc = writeRecord(OUTPUT_CHUNK, pendingOffset, 0, &pending[offset]);
offset += OUTPUT_CHUNK;
pendingOffset += OUTPUT_CHUNK;
pendingLen -= OUTPUT_CHUNK;
}
/* Copy any remaining bits back to the beginning of the buffer. */
if (pendingLen)
{
memmove(pending, &pending[offset], pendingLen);
}
return rc;
}
/* Write out any pending data. */
int flushPendingData(void)
{
int rc = 0;
assert(pendingLen < OUTPUT_CHUNK);
if (pendingLen)
{
rc = writeRecord(pendingLen, pendingOffset, 0, pending);
pendingLen = pendingOffset = 0;
}
return rc;
}
/* Write an arbitrary line of output (buffering if possible) */
int writeLine(Line *line)
{
static Uint16 lastExtendedOffset = 0;
int rc;
if (line->type)
{
/* Not a data record. */
if (line->type == 4)
{
Uint16 offset;
/* Extended offset record. */
if (line->len != 2)
{
fprintf(stderr,
"packihx: invalid extended offset record @ line %d\n",
lineno);
return -1;
}
offset = (line->data[0] << 8) + line->data[1];
if (offset == lastExtendedOffset)
{
/* We can simply skip this line. */
return 0;
}
else
{
lastExtendedOffset = offset;
}
}
if (flushPendingData())
{
return -1;
}
/* Write the line as is. */
rc = writeRecord(line->len, line->offset, line->type, line->data);
}
else
{
if (pendingOffset + pendingLen != (unsigned)line->offset)
{
/* This line is not contigous with the last one. Dump pending. */
if (flushPendingData())
{
return -1;
}
pendingOffset = line->offset;
}
rc = bufferOutput(line);
}
return rc;
}
int main(int argc, char *argv[])
{
FILE *inFile;
Line *line;
int closeFile;
int rc = 0;
if (argc > 1)
{
inFile = fopen(argv[1], "rt");
if (!inFile)
{
fprintf(stderr, "packihx: cannot open %s\n",
argv[1]);
return 1;
}
closeFile = 1;
}
else
{
inFile = stdin;
closeFile = 0;
}
while (!rc && ((line = readLine(inFile)) != NULL))
{
rc = validateChecksum(line);
if (!rc)
{
rc = writeLine(line);
}
free(line->data);
free(line);
}
if (!rc && !feof(inFile))
{
/* readLine must have failed for some reason. */
fprintf(stderr, "packihx: aborting after %d lines.\n", lineno);
rc = 1;
}
if (!rc)
{
/* Just in case there's something still pending. */
rc = flushPendingData();
}
if (!rc)
{
fprintf(stderr, "packihx: read %d lines, wrote %d: OK.\n", lineno, outlineno);
}
if (closeFile)
{
fclose(inFile);
}
return rc;
}
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