X-Git-Url: http://git.draconx.ca/gitweb/liblbx.git/blobdiff_plain/8ecf99dea1442f58a460c7eef60872ce5f5c94f1..e7aea0c6f323c6bbf364093305e60bb78999a23f:/src/lbx.c
diff --git a/src/lbx.c b/src/lbx.c
index 7376730..a2d3796 100644
--- a/src/lbx.c
+++ b/src/lbx.c
@@ -1,106 +1,316 @@
+/*
+ * 2ooM: The Master of Orion II Reverse Engineering Project
+ * Library for working with LBX archive files.
+ * Copyright © 2006-2010, 2013 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
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see .
+ */
+#include
#include
#include
#include
-#include
#include
+#include
-#include "byteorder.h"
+#include "pack.h"
+#include "misc.h"
+#include "error.h"
#include "lbx.h"
-#define LBX_MAGIC 0x0000fead
+#define LBX_MAGIC 0x0000fead
+#define LBX_HDR_SIZE 8
-int lbx_errno = 0;
+struct lbx_priv {
+ struct lbx pub;
-struct lbx_state {
- FILE *f;
- long offset;
+ char *name;
- uint16_t nfiles;
- uint32_t offsets[];
-};
+ const struct lbx_file_ops *fops;
+ int (*dtor)(void *handle);
+ void *f;
-struct lbx_state *lbx_fopen(FILE *f)
-{
- struct lbx_state *new = NULL;
- uint16_t nfiles, version;
- uint32_t magic;
+ struct lbx_file_state *last_file;
- 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;
+ unsigned long offsets[];
+};
- nfiles = letohs(nfiles);
- magic = letohl(magic);
- version = letohs(version);
+struct lbx_file_state {
+ unsigned long base, limit, offset;
+ struct lbx_priv *lbx;
+ int eof;
+};
+
+static struct lbx_priv *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_priv *lbx;
if (magic != LBX_MAGIC) {
- lbx_errno = LBX_EMAGIC;
+ lbx_error_raise(LBX_EMAGIC);
return NULL;
}
-
- new = malloc(sizeof *new + (nfiles+1)*(sizeof *new->offsets));
- if (!new) {
- lbx_errno = -errno;
+
+ lbx = malloc(sizeof *lbx + sizeof lbx->offsets[0] * (nfiles+1));
+ if (!lbx) {
+ lbx_error_raise(LBX_ENOMEM);
return NULL;
}
-
- *new = (struct lbx_state){
- .nfiles = nfiles,
- .f = f,
+
+ *lbx = (struct lbx_priv) {
+ .pub = { .nfiles = nfiles, },
};
-
- if (fread(new->offsets, sizeof *new->offsets, nfiles+1, f) != nfiles+1)
- goto readerr;
-
- return new;
-readerr:
- if (feof(f)) {
- lbx_errno = LBX_EEOF;
- } else {
- lbx_errno = -errno;
+
+ 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 *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_priv *lbx = NULL;
+ char *dupname = NULL;
+
+ dupname = str_dup(name);
+ if (!dupname) {
+ lbx_error_raise(LBX_ENOMEM);
+ goto err;
}
- free(new);
+ if (fops->read(hdr_buf, sizeof hdr_buf, f) != sizeof hdr_buf) {
+ if (fops->eof(f))
+ lbx_error_raise(LBX_EEOF);
+ 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->pub.nfiles; i++) {
+ unsigned char buf[4];
+
+ if (fops->read(buf, sizeof buf, f) != sizeof buf) {
+ if (fops->eof(f))
+ lbx_error_raise(LBX_EEOF);
+ goto err;
+ }
+
+ lbx->offsets[i] = unpack_32_le(buf);
+ }
+
+ return &lbx->pub;
+err:
+ free(dupname);
+ free(lbx);
return NULL;
}
-struct lbx_state *lbx_open(const char *path)
+static int file_close(void *f)
+{
+ return fclose((FILE *)f);
+}
+
+static int pipe_close(void *f)
+{
+ struct lbx_pipe_state *p = f;
+ int rc;
+
+ rc = fclose(p->f);
+ free(p);
+ return rc;
+}
+
+static char *last_component(const char *name)
+{
+ char *c;
+
+ /* TODO: Handle other path separators. */
+ c = strrchr(name, '/');
+ if (!c)
+ return (char *)name;
+ return c+1;
+}
+
+struct lbx *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"))) {
- new = lbx_fopen(f);
- } else {
- lbx_errno = -errno;
+
+ f = fopen(file, "rb");
+ if (!f) {
+ lbx_error_raise(-errno);
+ 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) {
+ lbx_error_raise(LBX_ENOMEM);
+ 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)
+int lbx_file_stat(struct lbx *pub, unsigned fileno, struct lbx_statbuf *buf)
{
- return lbx->nfiles;
+ struct lbx_priv *lbx = (struct lbx_priv *)pub;
+ static char str[256]; /* FIXME */
+
+ if (fileno >= lbx->pub.nfiles) {
+ lbx_error_raise(LBX_ENOENT);
+ buf->name = NULL;
+ return -1;
+ }
+
+ snprintf(str, sizeof str, "%s.%03u", lbx->name, fileno);
+ buf->name = str;
+ buf->size = lbx->offsets[fileno+1] - lbx->offsets[fileno];
+ return 0;
}
-void lbx_close(struct lbx_state *lbx)
+int lbx_close(struct lbx *pub)
{
- if (!lbx) return;
+ struct lbx_priv *lbx = (struct lbx_priv *)pub;
+ int rc = 0;
- fclose(lbx->f);
+ if (lbx && lbx->dtor)
+ rc = lbx->dtor(lbx->f);
+ free(lbx->name);
free(lbx);
+
+ return rc;
}
-const char *lbx_strerror(void)
+struct lbx_file_state *lbx_file_open(struct lbx *pub, unsigned fileno)
{
- if (lbx_errno < 0)
- return strerror(-lbx_errno);
+ struct lbx_priv *lbx = (struct lbx_priv *)pub;
+ struct lbx_file_state *state;
- switch (lbx_errno) {
- case LBX_ESUCCESS: return "Success";
- case LBX_EMAGIC: return "Bad magic number";
- case LBX_EEOF: return "Unexpected end-of-file";
+ if (fileno >= lbx->pub.nfiles) {
+ lbx_error_raise(LBX_ENOENT);
+ return NULL;
+ }
+
+ lbx->last_file = NULL;
+ if (lbx->fops->seek(lbx->f, lbx->offsets[fileno], SEEK_SET) != 0) {
+ return NULL;
}
- return "Unknown error";
+ state = malloc(sizeof *state);
+ if (!state) {
+ lbx_error_raise(LBX_ENOMEM);
+ 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_file_read(struct lbx_file_state *f, void *buf, size_t n)
+{
+ const struct lbx_file_ops *fops = f->lbx->fops;
+ size_t want = MIN(n, f->limit - f->offset);
+ size_t rc;
+
+ 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;
+ }
+
+ 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;
+}
+
+int lbx_file_seek(struct lbx_file_state *f, long offset, int whence)
+{
+ 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;
+ }
+
+ if (pos > f->limit)
+ return -1;
+
+ 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;
+}
+
+long lbx_file_tell(struct lbx_file_state *f)
+{
+ return f->offset;
+}
+
+int lbx_file_eof(struct lbx_file_state *f)
+{
+ return f->eof;
+}
+
+void lbx_file_close(struct lbx_file_state *f)
+{
+ if (f->lbx->last_file == f)
+ f->lbx->last_file = NULL;
+ free(f);
}