ref: 9bc6083e49a165ae93fae7293fb72688224c6f70
dir: /src/link/object.c/
/*
* Here we have the routines that read an objectfile
*
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "extern/err.h"
#include "link/assign.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 **dest, FILE *f)
{
size_t r = 0;
size_t bufferLength = 16;
char *start = malloc(bufferLength);
char *s = start;
if (!s) {
err(1, NULL);
}
while (((*s++) = fgetc(f)) != 0) {
r += 1;
if (r >= bufferLength) {
bufferLength *= 2;
start = realloc(start, bufferLength);
if (!start) {
err(1, NULL);
}
s = start + r;
}
}
*dest = start;
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) {
err(1, 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)
{
struct sSymbol *pSym;
pSym = malloc(sizeof *pSym);
if (!pSym) {
err(1, NULL);
}
readasciiz(&pSym->pzName, f);
if ((pSym->Type = (enum eSymbolType) fgetc(f)) != SYM_IMPORT) {
pSym->nSectionID = readlong(f);
pSym->nOffset = readlong(f);
}
return pSym;
}
/*
* RGB object reader routines
*
*/
struct sSection *
obj_ReadRGBSection(FILE * f)
{
struct sSection *pSection;
char *pzName;
readasciiz(&pzName, f);
if (IsSectionNameInUse(pzName))
errx(1, "Section name \"%s\" is already in use.", pzName);
pSection = AllocSection();
pSection->pzName = pzName;
pSection->nByteSize = readlong(f);
pSection->Type = (enum eSectionType) fgetc(f);
pSection->nOrg = readlong(f);
pSection->nBank = readlong(f);
pSection->nAlign = readlong(f);
if ((options & OPT_TINY) && (pSection->Type == SECT_ROMX)) {
errx(1, "ROMX sections can't be used with option -t.");
}
if ((options & OPT_CONTWRAM) && (pSection->Type == SECT_WRAMX)) {
errx(1, "WRAMX sections can't be used with option -w.");
}
if (options & OPT_DMG_MODE) {
/* WRAMX sections are checked for OPT_CONTWRAM */
if (pSection->Type == SECT_VRAM && pSection->nBank == 1) {
errx(1, "VRAM bank 1 can't be used with option -w.");
}
}
if ((pSection->Type == SECT_ROMX) || (pSection->Type == SECT_ROM0)) {
/*
* These sectiontypes contain data...
*
*/
if (pSection->nByteSize) {
pSection->pData = malloc(pSection->nByteSize);
if (!pSection->pData) {
err(1, NULL);
}
SLONG nNumberOfPatches;
struct sPatch **ppPatch, *pPatch;
fread(pSection->pData, sizeof(UBYTE),
pSection->nByteSize, f);
nNumberOfPatches = readlong(f);
ppPatch = &pSection->pPatches;
/*
* And patches...
*
*/
while (nNumberOfPatches--) {
pPatch = malloc(sizeof *pPatch);
if (!pPatch) {
err(1, NULL);
}
*ppPatch = pPatch;
readasciiz(&pPatch->pzFilename, f);
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) {
err(1, NULL);
}
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_ReadRGB(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) {
err(1, NULL);
}
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_ReadRGBSection(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 '3':
case '4': // V4 supports OAM sections, but is otherwise identical
obj_ReadRGB(pObjfile);
break;
default:
errx(1, "'%s' uses an unsupported object file version (%s). Please reassemble it.", tzObjectfile, tzHeader);
}
} else {
errx(1, "'%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(1, "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;
size -= readasciiz(&name, f);
readword(f);
size -= 2;
readword(f);
size -= 2;
size -= readlong(f);
size -= 4;
obj_ReadOpenFile(f, name);
free(name);
}
}