ref: 114871d46de3e7c380e0fd1d27ef31badb70416e
dir: /src/link/object.c/
/*
* Here we have the routines that read an objectfile
*
*/
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include "link/mylink.h"
#include "link/main.h"
struct sSymbol **tSymbols;
struct sSection *pSections = NULL;
struct sSection *pLibSections = NULL;
UBYTE dummymem;
BBOOL oReadLib = 0;
/*
* The usual byte order stuff
*
*/
SLONG
readlong(FILE * f)
{
SLONG r;
r = fgetc(f);
r |= fgetc(f) << 8;
r |= fgetc(f) << 16;
r |= fgetc(f) << 24;
return (r);
}
UWORD
readword(FILE * f)
{
UWORD r;
r = fgetc(f);
r |= fgetc(f) << 8;
return (r);
}
/*
* Read a NULL terminated string from a file
*
*/
SLONG
readasciiz(char *s, FILE * f)
{
SLONG r = 0;
while (((*s++) = fgetc(f)) != 0)
r += 1;
return (r + 1);
}
/*
* Allocate a new section and link it into the list
*
*/
struct sSection *
AllocSection(void)
{
struct sSection **ppSections;
if (oReadLib == 1)
ppSections = &pLibSections;
else
ppSections = &pSections;
while (*ppSections)
ppSections = &((*ppSections)->pNext);
*ppSections = malloc(sizeof **ppSections);
if (!*ppSections) {
errx(5, "Out of memory!");
return NULL;
}
(*ppSections)->tSymbols = tSymbols;
(*ppSections)->pNext = NULL;
(*ppSections)->pPatches = NULL;
(*ppSections)->oAssigned = 0;
return *ppSections;
}
/*
* Read a symbol from a file
*
*/
struct sSymbol *
obj_ReadSymbol(FILE * f)
{
char s[256];
struct sSymbol *pSym;
pSym = malloc(sizeof *pSym);
if (!pSym)
errx(5, "Out of memory!");
readasciiz(s, f);
pSym->pzName = malloc(strlen(s) + 1);
if (!pSym->pzName)
errx(5, "Out of memory!");
strcpy(pSym->pzName, s);
if ((pSym->Type = (enum eSymbolType) fgetc(f)) != SYM_IMPORT) {
pSym->nSectionID = readlong(f);
pSym->nOffset = readlong(f);
}
return pSym;
}
/*
* RGB0 object reader routines
*
*/
struct sSection *
obj_ReadRGB0Section(FILE * f)
{
struct sSection *pSection;
pSection = AllocSection();
pSection->nByteSize = readlong(f);
pSection->Type = (enum eSectionType) fgetc(f);
pSection->nOrg = -1;
pSection->nBank = -1;
/* does the user want the -s mode? */
if ((options & OPT_SMALL) && (pSection->Type == SECT_CODE)) {
pSection->Type = SECT_HOME;
}
if ((pSection->Type == SECT_CODE) || (pSection->Type == SECT_HOME)) {
/*
* These sectiontypes contain data...
*
*/
if (pSection->nByteSize) {
pSection->pData = malloc(pSection->nByteSize);
if (!pSection->pData)
errx(5, "Out of memory!");
SLONG nNumberOfPatches;
struct sPatch **ppPatch, *pPatch;
char s[256];
fread(pSection->pData, sizeof(UBYTE),
pSection->nByteSize, f);
nNumberOfPatches = readlong(f);
ppPatch = &pSection->pPatches;
/*
* And patches...
*
*/
while (nNumberOfPatches--) {
pPatch = malloc(sizeof *pPatch);
if (!pPatch)
errx(5, "Out of memory!");
*ppPatch = pPatch;
readasciiz(s, f);
pPatch->pzFilename = malloc(strlen(s) + 1);
if (!pPatch->pzFilename)
errx(5, "Out of memory!");
strcpy(pPatch->pzFilename, s);
pPatch->nLineNo =
readlong(f);
pPatch->nOffset =
readlong(f);
pPatch->Type =
(enum ePatchType)
fgetc(f);
if ((pPatch->nRPNSize = readlong(f)) > 0) {
pPatch->pRPN = malloc(pPatch->nRPNSize);
if (!pPatch->pRPN)
errx(5, "Out of memory!");
fread(pPatch->pRPN, sizeof(UBYTE),
pPatch->nRPNSize, f);
} else
pPatch->pRPN = NULL;
pPatch->pNext = NULL;
ppPatch = &(pPatch->pNext);
}
} else {
/* Skip number of patches */
readlong(f);
pSection->pData = &dummymem;
}
}
return pSection;
}
void
obj_ReadRGB0(FILE * pObjfile)
{
struct sSection *pFirstSection;
SLONG nNumberOfSymbols, nNumberOfSections, i;
nNumberOfSymbols = readlong(pObjfile);
nNumberOfSections = readlong(pObjfile);
/* First comes the symbols */
if (nNumberOfSymbols) {
tSymbols = malloc(nNumberOfSymbols * sizeof(struct sSymbol *));
if (!tSymbols)
errx(5, "Out of memory!");
for (i = 0; i < nNumberOfSymbols; i += 1)
tSymbols[i] = obj_ReadSymbol(pObjfile);
} else
tSymbols = (struct sSymbol **) & dummymem;
/* Next we have the sections */
pFirstSection = NULL;
while (nNumberOfSections--) {
struct sSection *pNewSection;
pNewSection = obj_ReadRGB0Section(pObjfile);
pNewSection->nNumberOfSymbols = nNumberOfSymbols;
if (pFirstSection == NULL)
pFirstSection = pNewSection;
}
/*
* Fill in the pSection entry in the symbolstructure.
* This REALLY needs some cleaning up... but, hey, it works
*
*/
for (i = 0; i < nNumberOfSymbols; i += 1) {
struct sSection *pConvSect = pFirstSection;
if (tSymbols[i]->Type != SYM_IMPORT
&& tSymbols[i]->nSectionID != -1) {
SLONG j = 0;
while (j != tSymbols[i]->nSectionID) {
j += 1;
pConvSect = pConvSect->pNext;
}
tSymbols[i]->pSection = pConvSect;
} else
tSymbols[i]->pSection = NULL;
}
}
/*
* RGB1 object reader routines
*
*/
struct sSection *
obj_ReadRGB1Section(FILE * f)
{
struct sSection *pSection;
pSection = AllocSection();
pSection->nByteSize = readlong(f);
pSection->Type = (enum eSectionType) fgetc(f);
/*
* And because of THIS new feature I'll have to rewrite loads and
* loads of stuff... oh well it needed to be done anyway
*
*/
pSection->nOrg = readlong(f);
pSection->nBank = readlong(f);
/* does the user want the -s mode? */
if ((options & OPT_SMALL) && (pSection->Type == SECT_CODE)) {
pSection->Type = SECT_HOME;
}
if ((pSection->Type == SECT_CODE) || (pSection->Type == SECT_HOME)) {
/*
* These sectiontypes contain data...
*
*/
if (pSection->nByteSize) {
pSection->pData = malloc(pSection->nByteSize);
if (!pSection->pData)
errx(5, "Out of memory!");
SLONG nNumberOfPatches;
struct sPatch **ppPatch, *pPatch;
char s[256];
fread(pSection->pData, sizeof(UBYTE),
pSection->nByteSize, f);
nNumberOfPatches = readlong(f);
ppPatch = &pSection->pPatches;
/*
* And patches...
*
*/
while (nNumberOfPatches--) {
pPatch = malloc(sizeof *pPatch);
if (!pPatch)
errx(5, "Out of memory!");
*ppPatch = pPatch;
readasciiz(s, f);
pPatch->pzFilename = malloc(strlen(s) + 1);
if (!pPatch->pzFilename)
errx(5, "Out of memory!");
strcpy(pPatch->pzFilename, s);
pPatch->nLineNo = readlong(f);
pPatch->nOffset = readlong(f);
pPatch->Type = (enum ePatchType) fgetc(f);
if ((pPatch->nRPNSize = readlong(f)) > 0) {
pPatch->pRPN = malloc(pPatch->nRPNSize);
if (!pPatch->pRPN)
errx(5, "Out of memory!");
fread(pPatch->pRPN, sizeof(UBYTE),
pPatch->nRPNSize, f);
} else
pPatch->pRPN = NULL;
pPatch->pNext = NULL;
ppPatch = &(pPatch->pNext);
}
} else {
/* Skip number of patches */
readlong(f);
pSection->pData = &dummymem;
}
}
return pSection;
}
void
obj_ReadRGB1(FILE * pObjfile)
{
struct sSection *pFirstSection;
SLONG nNumberOfSymbols, nNumberOfSections, i;
nNumberOfSymbols = readlong(pObjfile);
nNumberOfSections = readlong(pObjfile);
/* First comes the symbols */
if (nNumberOfSymbols) {
tSymbols = malloc(nNumberOfSymbols * sizeof *tSymbols);
if (!tSymbols)
errx(5, "Out of memory!");
for (i = 0; i < nNumberOfSymbols; i += 1)
tSymbols[i] = obj_ReadSymbol(pObjfile);
} else
tSymbols = (struct sSymbol **) & dummymem;
/* Next we have the sections */
pFirstSection = NULL;
while (nNumberOfSections--) {
struct sSection *pNewSection;
pNewSection = obj_ReadRGB1Section(pObjfile);
pNewSection->nNumberOfSymbols = nNumberOfSymbols;
if (pFirstSection == NULL)
pFirstSection = pNewSection;
}
/*
* Fill in the pSection entry in the symbolstructure.
* This REALLY needs some cleaning up... but, hey, it works
*
*/
for (i = 0; i < nNumberOfSymbols; i += 1) {
struct sSection *pConvSect = pFirstSection;
if (tSymbols[i]->Type != SYM_IMPORT
&& tSymbols[i]->nSectionID != -1) {
SLONG j = 0;
while (j != tSymbols[i]->nSectionID) {
j += 1;
pConvSect = pConvSect->pNext;
}
tSymbols[i]->pSection = pConvSect;
} else
tSymbols[i]->pSection = NULL;
}
}
/*
* The main objectfileloadroutine (phew)
*
*/
void
obj_ReadOpenFile(FILE * pObjfile, char *tzObjectfile)
{
char tzHeader[8];
fread(tzHeader, sizeof(char), 4, pObjfile);
tzHeader[4] = 0;
if (strncmp(tzHeader, "RGB", 3) == 0) {
switch (tzHeader[3]) {
case '0':
obj_ReadRGB0(pObjfile);
break;
case '1':
case '2':
//V2 is really the same but the are new patch types
obj_ReadRGB1(pObjfile);
break;
default:
errx(5, "'%s' is an unsupported version",
tzObjectfile);
break;
}
} else {
errx(5, "'%s' is not a valid object", tzObjectfile);
}
}
void
obj_Readfile(char *tzObjectfile)
{
FILE *pObjfile;
if (options & OPT_SMART_C_LINK)
oReadLib = 1;
else
oReadLib = 0;
pObjfile = fopen(tzObjectfile, "rb");
if (pObjfile == NULL)
err(EX_NOINPUT, "Unable to open object '%s'",
tzObjectfile);
obj_ReadOpenFile(pObjfile, tzObjectfile);
fclose(pObjfile);
oReadLib = 0;
}
SLONG
file_Length(FILE * f)
{
ULONG r, p;
p = ftell(f);
fseek(f, 0, SEEK_END);
r = ftell(f);
fseek(f, p, SEEK_SET);
return (r);
}
void
lib_ReadXLB0(FILE * f)
{
SLONG size;
size = file_Length(f) - 4;
while (size) {
char name[256];
size -= readasciiz(name, f);
readword(f);
size -= 2;
readword(f);
size -= 2;
size -= readlong(f);
size -= 4;
obj_ReadOpenFile(f, name);
}
}
void
lib_Readfile(char *tzLibfile)
{
FILE *pObjfile;
oReadLib = 1;
pObjfile = fopen(tzLibfile, "rb");
if (pObjfile == NULL)
err(EX_NOINPUT, "Unable to open object '%s'", tzLibfile);
if (!pObjfile) {
errx(5, "Unable to open '%s'", tzLibfile);
}
char tzHeader[5];
fread(tzHeader, sizeof(char), 4, pObjfile);
tzHeader[4] = 0;
if (strcmp(tzHeader, "XLB0") == 0)
lib_ReadXLB0(pObjfile);
else {
errx(5, "'%s' is an invalid library",
tzLibfile);
}
fclose(pObjfile);
}