mac-rom/Tools/ToolSource/RomLink.c

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/* I interpret the "RomLink" bytecode. My "programs" are resources. */
#include <stdio.h>
#include <Memory.h>
#include <Resources.h>
#include <Finder.h>
#include <Files.h>
// Symbolic constants for ROMLink opcodes.
#define __RL_OP_CSTRING 0x80
#define __RL_OP_INCLUDE 0x81
#define __RL_OP_BEGIN 0x82
#define __RL_OP_END 0x83
#define __RL_OP_BLOCKSIZE 0x84
#define __RL_OP_ROMLENGTH 0x86
#define __RL_OP_ROMCRC 0x87
#define __RL_OP_TREESIZE 0x88
#define __RL_OP_ALIGN 0x89
#define __RL_OP_ANCHOR 0x8a
#define __RL_OP_KEY 0xfe
#define __RL_OP_COMMENT 0xff
// Symbolic constants for ROMLink resource pattern selectors.
#define __RL_SEL_FILENAME 1
#define __RL_SEL_NAME 2
#define __RL_SEL_TYPE 3
#define __RL_SEL_ID 4
#define __RL_SEL_LOCAL 5
/* GLOBALS used by get_program and free_program */
char blergh[] = "nodeformxfrmcstrlongstypexecpinisinivdevpramvmnalistspdrsdirboarsrscddirgdirvdirvendvmod";
ResType *global_type_list;
long global_type_count;
void to_pas(unsigned char *p, char *c)
{
int sl = strlen(c);
p[0] = sl;
memcpy(p+1, c, sl);
}
void get_program(unsigned char **prog_p, long *len_p, unsigned char *name)
{
long i;
Handle hdl = NULL;
for(i=0; i<global_type_count; i++)
{
hdl = GetNamedResource(global_type_list[i], name);
if(hdl) break;
}
if(!hdl)
{
*prog_p = NULL;
*len_p = 0;
fprintf(stderr, "Could not find program \"%.*s\"\n", *name, name+1);
}
*prog_p = *(unsigned char **)hdl;
*len_p = GetHandleSize(hdl);
}
void free_program(unsigned char *prog)
{
DisposeHandle(RecoverHandle((Ptr)prog));
}
int do_program(unsigned char *const middle, unsigned char *program, long prog_len, long *leftlenp, long *rightlenp)
{
unsigned char *prog_base = program;
unsigned char *left = middle;
unsigned char *right = middle;
unsigned char *real_left, *fake_middle, *real_right;
unsigned char offset_field_bytes;
unsigned long *put_len_here = NULL;
unsigned long *put_crc_here = NULL;
//printf("do_program middle=0x%x program=0x%x prog_len=0x%x\n", middle, program, prog_len);
while(program < prog_base + prog_len)
{
unsigned char opcode = *program++;
if(127 >= opcode)
{
memcpy(right, program, opcode);
right += opcode;
program += opcode;
}
else if(__RL_OP_CSTRING == opcode)
{
long len_with_nul = strlen(program) + 1;
memcpy(right, program, len_with_nul);
right += len_with_nul;
program += len_with_nul;
if(len_with_nul & 1)
{
*right++ = 0;
}
}
else if(__RL_OP_INCLUDE == opcode)
{
unsigned char selector;
unsigned char *res_name_pstr = NULL;
unsigned char *other_prog;
long other_prog_len;
long used_leftlen, used_rightlen;
int result;
while((selector = *program++) != 0)
{
if(selector == __RL_SEL_NAME)
{
res_name_pstr = program;
program += *program + 1;
}
}
if(!res_name_pstr) { fprintf(stderr, "INCLUDE opcode with unimplemented resource pattern selector\n"); return 1; }
get_program(&other_prog, &other_prog_len, res_name_pstr);
if(!other_prog) return 1;
result = do_program(right, other_prog, other_prog_len, &used_leftlen, &used_rightlen);
free_program(other_prog);
if(result) return result;
if(left != right && used_leftlen) { fprintf(stderr, "Overwrote to the left!\n"); return 1; }
left = right - used_leftlen;
right = right + used_rightlen;
}
else if(__RL_OP_BEGIN == opcode)
{
offset_field_bytes = *program++ / 8; /* how many bytes this is going to use */
real_left = left; /* for when we return to our senses */
real_right = right;
left = right = fake_middle = left - 0x1000; /* off to lala land, with 4k of room */
}
else if(__RL_OP_END == opcode)
{
long newstufflen = right - left;
long offset;
if(right > real_left) { fprintf(stderr, "Ran out of breathing room!\n"); return 1; }
real_left -= newstufflen; /* my left including new stuff */
fake_middle += real_left - left; /* the middle of the new stuff */
memmove(real_left, left, newstufflen);
left = real_left; /* get out of lala land */
right = real_right;
offset = fake_middle - right;
if((long)right & 1) offset += 1; /* pretend this field is long-aligned */
memcpy(right, (char *)(&offset) + 4 - offset_field_bytes, offset_field_bytes);
//printf("%08x\n", offset);
right += offset_field_bytes;
offset_field_bytes = 0;
}
else if(__RL_OP_BLOCKSIZE == opcode)
{
fprintf(stderr, "BLOCKSIZE not implemented\n"); return 1;
}
else if(__RL_OP_ROMLENGTH == opcode)
{
put_len_here = (unsigned long *)right;
right += 4;
}
else if(__RL_OP_ROMCRC == opcode)
{
put_crc_here = (unsigned long *)right;
right += 4;
}
else if(__RL_OP_TREESIZE == opcode)
{
fprintf(stderr, "TREESIZE not implemented\n"); return 1;
}
else if(__RL_OP_ALIGN == opcode)
{
unsigned char align = *program++;
while((unsigned long)right % align)
{
*right++ = 0;
}
}
else if(__RL_OP_ANCHOR == opcode)
{
fprintf(stderr, "ANCHOR not implemented\n"); return 1;
}
else if(__RL_OP_KEY == opcode)
{
unsigned char key = *program++; /* nop */
}
else if(__RL_OP_COMMENT == opcode)
{
fprintf(stderr, "COMMENT not implemented\n"); return 1;
}
else
{
fprintf(stderr, "Unknown opcode %d\n", opcode); return 1;
}
}
if(put_len_here) *put_len_here = right - left;
if(put_crc_here)
{
unsigned char *ptr;
unsigned long sum;
*put_crc_here = 0;
sum = 0;
ptr = left;
for(ptr=left; ptr<right; ptr++)
{
sum = (sum << 1) | (sum >> 31);
sum += *ptr;
}
*put_crc_here = sum;
}
*leftlenp = middle - left;
*rightlenp = right - middle;
return 0;
}
int main(int argc, char **argv)
{
int print_usage = 0;
short *refnum_list;
int refnum_count = 0;
short refnum;
Str255 pas;
char *outfile = NULL;
unsigned char *buf, *middle;
unsigned char *prog;
long prog_len;
int result;
long used_left, used_right;
long i;
short err;
FInfo fi;
FILE *f;
long writesize, writtensize;
global_type_list = (ResType *)blergh;
global_type_count = 22;
refnum_list = (short *)calloc(argc, sizeof *refnum_list);
if(!refnum_list)
{ fprintf(stderr, "%s: extreme memory pressure. Quitting.\n", argv[0]); return 1; }
for(i=1; i<argc; i++)
{
if(!strcmp("-o", argv[i]))
{
if(i == argc - 1)
{
print_usage = 1;
break;
}
outfile = argv[++i];
}
else
{
to_pas(pas, argv[i]);
refnum = OpenResFile(pas);
if(refnum <= 0)
{ fprintf(stderr, "%s: Failed to open %s\n", argv[0], argv[i]); return 1; }
refnum_list[refnum_count++] = refnum;
}
}
if(!outfile) print_usage = 1;
if(!refnum_count) print_usage = 1;
if(print_usage) { fprintf(stderr, "USAGE: %s -o OUT FILE [...]\n", argv[0]); return 1; }
to_pas(pas, "Root");
get_program(&prog, &prog_len, pas);
if(!prog) { fprintf(stderr, "%s: could not get Root program\n", argv[0]); return 1; }
buf = (unsigned char *)calloc(1, 0x40000);
middle = buf + 0x38000;
if(!buf) { fprintf(stderr, "%s: serious memory pressure. Quitting.\n", argv[0]); return 1; }
result = do_program(middle, prog, prog_len, &used_left, &used_right);
free_program(prog);
if(result) return result;
while(refnum_count) CloseResFile(refnum_list[--refnum_count]);
/* WRITEOUT */
writesize = used_left + used_right;
f = fopen(outfile, "wb");
if(!f) { fprintf(stderr, "%s: could not open for output %s\n", argv[0], outfile); return 1; }
writtensize = fwrite(middle - used_left, 1, writesize, f);
if(writtensize != writesize) { fprintf(stderr, "%s: could not write\n", argv[0]); return 1; }
free(buf);
fclose(f);
to_pas(pas, outfile);
err = GetFInfo(pas, 0, &fi);
if(!err)
{
fi.fdType = 0x6465636C; /*decl -- so nothing else tries to mess with it!*/
fi.fdCreator = 0x6465636C; /*decl*/
err = SetFInfo(pas, 0, &fi);
}
return 0;
}