/*
* 2ooM: The Master of Orion II Reverse Engineering Project
* Library for working with LBX archive files.
- * Copyright (C) 2006-2008 Nick Bowler
+ * Copyright (C) 2006-2010 Nick Bowler
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <stdint.h>
#include <errno.h>
#include <assert.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
-
-#include "byteorder.h"
+#include "pack.h"
#include "misc.h"
#include "lbx.h"
-#define LBX_MAGIC 0x0000fead
+#define LBX_MAGIC 0x0000fead
+#define LBX_HDR_SIZE 8
int lbx_errno = 0;
struct lbx_state {
- const char *name;
+ char *name;
- unsigned char *mem;
- size_t memsize;
- FILE *f;
- long foff;
+ const struct lbx_file_ops *fops;
+ int (*dtor)(void *handle);
+ void *f;
- uint16_t nfiles;
- uint32_t offsets[];
-};
+ struct lbx_file_state *last_file;
-struct lbx_state *lbx_fopen(FILE *f, const char *name)
-{
- struct lbx_state *new = NULL;
- uint16_t nfiles, version;
- uint32_t magic;
+ unsigned short nfiles;
+ unsigned long offsets[];
+};
- if (fread(&nfiles, sizeof nfiles, 1, f) != 1) goto readerr;
- if (fread(&magic, sizeof magic, 1, f) != 1) goto readerr;
- if (fread(&version, sizeof version, 1, f) != 1) goto readerr;
+struct lbx_file_state {
+ unsigned long base, limit, offset;
+ struct lbx_state *lbx;
+ int eof;
+};
- nfiles = letohs(nfiles);
- magic = letohl(magic);
- version = letohs(version);
+static struct lbx_state *lbx_init(unsigned char hdr[static LBX_HDR_SIZE])
+{
+ unsigned short nfiles = unpack_16_le(hdr+0);
+ unsigned long magic = unpack_32_le(hdr+2);
+ unsigned short version = unpack_16_le(hdr+6);
+ struct lbx_state *lbx;
if (magic != LBX_MAGIC) {
- lbx_errno = LBX_EMAGIC;
+ lbx_errno = -LBX_EMAGIC;
return NULL;
}
-
- new = malloc(sizeof *new + (nfiles+1)*(sizeof *new->offsets));
- if (!new) {
+
+ lbx = malloc(sizeof *lbx + sizeof lbx->offsets[0] * (nfiles+1));
+ if (!lbx) {
lbx_errno = -errno;
return NULL;
}
-
- *new = (struct lbx_state){
- .name = name,
+
+ *lbx = (struct lbx_state) {
.nfiles = nfiles,
- .f = f,
- .foff = sizeof nfiles + sizeof magic + sizeof version,
};
-
- if (fread(new->offsets, sizeof *new->offsets, nfiles+1, f) != nfiles+1)
- goto readerr;
- new->foff += sizeof *new->offsets * (nfiles+1);
-
- return new;
-readerr:
- if (feof(f)) {
- lbx_errno = LBX_EEOF;
- } else {
+
+ return lbx;
+}
+
+static char *str_dup(const char *s)
+{
+ char *buf;
+
+ buf = malloc(strlen(s)+1);
+ if (buf)
+ strcpy(buf, s);
+ return buf;
+}
+
+struct lbx_state *lbx_open(void *f, const struct lbx_file_ops *fops,
+ int (*destructor)(void *), const char *name)
+{
+ unsigned char hdr_buf[LBX_HDR_SIZE];
+ struct lbx_state *lbx = NULL;
+ char *dupname = NULL;
+
+ dupname = str_dup(name);
+ if (!dupname) {
lbx_errno = -errno;
+ goto err;
}
- free(new);
+ if (fops->read(hdr_buf, sizeof hdr_buf, f) != sizeof hdr_buf) {
+ lbx_errno = -errno;
+ goto err;
+ }
+
+ lbx = lbx_init(hdr_buf);
+ if (!lbx)
+ goto err;
+
+ lbx->name = dupname;
+ lbx->dtor = destructor;
+ lbx->fops = fops;
+ lbx->f = f;
+
+ for (unsigned i = 0; i <= lbx->nfiles; i++) {
+ unsigned char buf[4];
+
+ if (fops->read(buf, sizeof buf, f) != sizeof buf) {
+ lbx_errno = -errno;
+ if (fops->eof(f))
+ lbx_errno = LBX_EEOF;
+ goto err;
+ }
+
+ lbx->offsets[i] = unpack_32_le(buf);
+ }
+
+ return lbx;
+err:
+ free(dupname);
+ free(lbx);
return NULL;
}
-static int _lbx_memcpy(void *dest, struct lbx_state *src, size_t size)
+static int file_close(void *f)
{
- if (src->foff + size > src->memsize)
- return -1;
- memcpy(dest, src->mem + src->foff, size);
- src->foff += size;
- return 0;
+ return fclose((FILE *)f);
}
-struct lbx_state *lbx_mopen(void *_mem, size_t size, const char *name)
+static int pipe_close(void *f)
{
- struct lbx_state *new = NULL;
- struct lbx_state tmp = { .mem = _mem, .memsize = size };
- uint16_t nfiles, version;
- uint32_t magic;
+ struct lbx_pipe_state *p = f;
+ int rc;
- if (_lbx_memcpy(&nfiles, &tmp, sizeof nfiles) == -1) goto eof;
- if (_lbx_memcpy(&magic, &tmp, sizeof magic) == -1) goto eof;
- if (_lbx_memcpy(&version, &tmp, sizeof version) == -1) goto eof;
+ rc = fclose(p->f);
+ free(p);
+ return rc;
+}
- nfiles = letohs(nfiles);
- magic = letohl(magic);
- version = letohs(version);
+static char *last_component(const char *name)
+{
+ char *c;
- if (magic != LBX_MAGIC) {
- lbx_errno = LBX_EMAGIC;
- return NULL;
- }
-
- new = malloc(sizeof *new + (nfiles+1)*(sizeof *new->offsets));
- if (!new) {
- lbx_errno = -errno;
- return NULL;
- }
-
- *new = (struct lbx_state){
- .name = name,
- .nfiles = nfiles,
- .mem = _mem,
- .memsize = size,
- .foff = tmp.foff,
- };
-
- if (_lbx_memcpy(new->offsets, new, (nfiles+1)*(sizeof *new->offsets)))
- goto eof;
-
- return new;
-eof:
- free(new);
- lbx_errno = LBX_EEOF;
- return NULL;
+ /* TODO: Handle other path separators. */
+ c = strrchr(name, '/');
+ if (!c)
+ return (char *)name;
+ return c+1;
}
-struct lbx_state *lbx_open(const char *path)
+struct lbx_state *lbx_fopen(const char *file)
{
- struct lbx_state *new = NULL;
+ const char *name = last_component(file);
+ struct lbx_pipe_state *p;
FILE *f;
-
- if ((f = fopen(path, "rb"))) {
- const char *name = strrchr(path, '/');
- new = lbx_fopen(f, name ? name+1 : path);
- } else {
- lbx_errno = -errno;
+
+ f = fopen(file, "rb");
+ if (!f)
+ return NULL;
+
+ if (fseek(f, 0, SEEK_CUR) == 0)
+ return lbx_open(f, &lbx_default_fops, file_close, name);
+
+ p = malloc(sizeof *p);
+ if (!p) {
+ fclose(f);
+ return NULL;
}
- return new;
+ *p = (struct lbx_pipe_state) { .f = f };
+ return lbx_open(p, &lbx_pipe_fops, pipe_close, name);
}
size_t lbx_numfiles(struct lbx_state *lbx)
return lbx->nfiles;
}
-int lbx_stat(struct lbx_state *lbx, size_t index, struct lbx_statbuf *buf)
+int
+lbx_file_stat(struct lbx_state *lbx, unsigned fileno, struct lbx_statbuf *buf)
{
static char str[256]; /* FIXME */
- if (index >= lbx->nfiles) {
+ if (fileno >= lbx->nfiles) {
buf->name = NULL;
lbx_errno = LBX_ERANGE;
return -1;
}
- snprintf(str, sizeof str, "%s.%03d", lbx->name, index);
+ snprintf(str, sizeof str, "%s.%03u", lbx->name, fileno);
buf->name = str;
- buf->size = lbx->offsets[index+1] - lbx->offsets[index];
+ buf->size = lbx->offsets[fileno+1] - lbx->offsets[fileno];
return 0;
}
-static size_t
-_lbx_mextract(struct lbx_state *lbx, size_t base, size_t len, FILE *of)
+int lbx_close(struct lbx_state *lbx)
{
- size_t rc;
+ int rc = 0;
- assert(lbx->mem);
- assert(base + len <= lbx->memsize);
-
- rc = fwrite(lbx->mem + base, 1, len, of);
- if (rc < len)
- lbx_errno = -errno;
+ if (lbx && lbx->dtor)
+ rc = lbx->dtor(lbx->f);
+ free(lbx->name);
+ free(lbx);
return rc;
}
-static size_t
-_lbx_fextract(struct lbx_state *lbx, size_t base, size_t len, FILE *of)
+struct lbx_file_state *lbx_file_open(struct lbx_state *lbx, unsigned fileno)
{
- unsigned char buf[1024];
- size_t rc, written = 0;
-
- assert(lbx->f);
-
- if (_lbx_fseek(lbx->f, &lbx->foff, base) == -1)
- return 0;
-
- while (len) {
- size_t amt = MIN(len, sizeof buf);
-
- rc = fread(buf, 1, amt, lbx->f);
- lbx->foff += rc;
- len -= rc;
- if (rc < amt) {
- if (feof(lbx->f)) lbx_errno = LBX_EEOF;
- else lbx_errno = -errno;
- break;
- }
+ struct lbx_file_state *state;
- rc = fwrite(buf, 1, amt, of);
- written += rc;
- if (rc < amt) {
- lbx_errno = -errno;
- break;
- }
+ if (fileno >= lbx->nfiles) {
+ lbx_errno = LBX_ERANGE;
+ return NULL;
}
- return written;
+ lbx->last_file = NULL;
+ if (lbx->fops->seek(lbx->f, lbx->offsets[fileno], SEEK_SET) != 0) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ state = malloc(sizeof *state);
+ if (!state) {
+ lbx_errno = -errno;
+ return NULL;
+ }
+
+ *state = (struct lbx_file_state) {
+ .base = lbx->offsets[fileno],
+ .limit = lbx->offsets[fileno+1] - lbx->offsets[fileno],
+ .lbx = lbx,
+ };
+
+ lbx->last_file = state;
+ return state;
}
-size_t lbx_extract(struct lbx_state *lbx, size_t index, FILE *of)
+size_t lbx_file_read(struct lbx_file_state *f, void *buf, size_t n)
{
- size_t base, len;
+ const struct lbx_file_ops *fops = f->lbx->fops;
+ size_t want = MIN(n, f->limit - f->offset);
+ size_t rc;
- if (index >= lbx->nfiles) {
- lbx_errno = LBX_ERANGE;
- return 0;
+ if (f != f->lbx->last_file) {
+ f->lbx->last_file = NULL;
+ if (fops->seek(f->lbx->f, f->base + f->limit, SEEK_SET) != 0)
+ return 0;
+ f->lbx->last_file = f;
}
-
- base = lbx->offsets[index];
- len = lbx->offsets[index+1] - lbx->offsets[index];
- if (lbx->mem)
- return _lbx_mextract(lbx, base, len, of);
- return _lbx_fextract(lbx, base, len, of);
+ rc = fops->read(buf, want, f->lbx->f);
+ f->offset += rc;
+
+ if (want < n || (rc < want && fops->eof(f->lbx->f)))
+ f->eof = 1;
+ return rc;
}
-void *lbx_mmap(struct lbx_state *lbx, size_t index, size_t *len)
+int lbx_file_seek(struct lbx_file_state *f, long offset, int whence)
{
- unsigned char *mapping;
- struct stat statbuf;
- size_t base;
-
- if (index >= lbx->nfiles) {
- lbx_errno = LBX_ERANGE;
- return NULL;
- }
-
- base = lbx->offsets[index];
- *len = lbx->offsets[index+1] - lbx->offsets[index];
-
- if (lbx->mem)
- return lbx->mem + base;
-
- if (fstat(fileno(lbx->f), &statbuf) == -1) {
- lbx_errno = -errno;
- return NULL;
+ const struct lbx_file_ops *fops = f->lbx->fops;
+ unsigned long pos;
+
+ switch (whence) {
+ case SEEK_CUR:
+ pos = f->offset + offset;
+ break;
+ case SEEK_SET:
+ pos = offset;
+ break;
+ case SEEK_END:
+ pos = f->limit + offset;
+ break;
}
- mapping = mmap(NULL, statbuf.st_size, PROT_READ, 0, fileno(lbx->f), 0);
- if (mapping == MAP_FAILED) {
- lbx_errno = -errno;
- return NULL;
- }
+ if (pos > f->limit)
+ return -1;
- lbx->mem = mapping;
- lbx->memsize = statbuf.st_size;
- return mapping + base;
+ f->lbx->last_file = NULL;
+ if (fops->seek(f->lbx->f, f->base + pos, SEEK_SET) != 0)
+ return -1;
+
+ f->offset = pos;
+ f->lbx->last_file = f;
+ f->eof = 0;
+
+ return 0;
}
-void lbx_close(struct lbx_state *lbx)
+long lbx_file_tell(struct lbx_file_state *f)
{
- if (!lbx) return;
+ return f->offset;
+}
- if (lbx->f) {
- fclose(lbx->f);
- if (lbx->mem) {
- munmap(lbx->mem, lbx->memsize);
- }
- }
+int lbx_file_eof(struct lbx_file_state *f)
+{
+ return f->eof;
+}
- free(lbx);
+void lbx_file_close(struct lbx_file_state *f)
+{
+ if (f->lbx->last_file == f)
+ f->lbx->last_file = NULL;
+ free(f);
}
const char *lbx_strerror(void)
projects / liblbx.git / blobdiff