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#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "../common.h"
#include "param.h"
#define INVALID_FORMAT_ERROR(fn) \
nerv_error(L, "Invalid param file: %s", fn)
#define CHECK_FORMAT(exp, ret, fname) \
do { \
if ((exp) != (ret)) INVALID_FORMAT_ERROR(fn); \
} while (0)
const char *nerv_param_file_tname = "nerv.ParamFile";
const char *nerv_param_file_handle_tname = "nerv.ParamFileHandle";
const char *nerv_param_chunk_info_tname = "nerv.ParamChunkInfo";
const char *nerv_param_chunk_data_tname = "nerv.ParamChunkData";
#define PARAM_HEADER_SIZE 16
enum {
NORMAL,
INVALID_FORMAT,
END_OF_FILE
};
size_t read_param_header_plain(FILE *fp, int *status) {
static char buff[PARAM_HEADER_SIZE];
int i;
size_t size = 0;
*status = NORMAL;
if (fread(buff, 1, PARAM_HEADER_SIZE, fp) != PARAM_HEADER_SIZE)
{
if (feof(fp)) *status = END_OF_FILE;
else *status = INVALID_FORMAT;
}
for (i = 0; i < PARAM_HEADER_SIZE; i++)
if (isdigit(buff[i]))
size = size * 10 + buff[i] - '0';
fprintf(stderr, "header: %d\n", size);
return size;
}
ParamChunkData *get_param_chunk_data(FILE *fp, ParamChunkInfo *info) {
ParamChunkData *pcd = (ParamChunkData *)malloc(sizeof(ParamChunkData));
pcd->data = (char *)malloc(info->length);
pcd->fp = fmemopen(pcd->data, info->length, "r");
assert(fseeko(fp, info->offset, SEEK_SET) == 0);
assert(fread(pcd->data, 1, info->length, fp) == (size_t)info->length);
return pcd;
}
const char *read_param_metadata(lua_State *L, FILE *fp, const char *fn) {
#define LINEBUFF_SIZE 1024
static char buff[7 + LINEBUFF_SIZE] = "return ";
CHECK_FORMAT(fgets(buff + 7, LINEBUFF_SIZE, fp), buff + 7, fn);
fprintf(stderr, "metadata: %s\n", buff);
return buff;
}
int nerv_param_file_open_write(lua_State *L, const char *fn) {
FILE *fp = fopen(fn, "w");
if (!fp) nerv_error(L, "Error while opening param file: %s", fn);
lua_newtable(L);
return 1;
}
int nerv_param_file_open_read(lua_State *L, const char *fn) {
FILE *fp = fopen(fn, "r");
int i, status;
size_t param_len;
off_t offset;
ParamFileHandle *lfp;
if (!fp) nerv_error(L, "Error while opening param file: %s", fn);
offset = ftello(fp);
lua_newtable(L);
fprintf(stderr, "%d\n", (int)offset);
for (i = 0;; offset += param_len, i++)
{
ParamChunkInfo *pci;
fprintf(stderr, "reading param chunk %d from %d\n", i, (int)offset);
/* skip to the begining of param chunk i */
CHECK_FORMAT(fseeko(fp, offset, SEEK_SET), 0, fn);
/* read header */
param_len = read_param_header_plain(fp, &status);
if (status == END_OF_FILE) break;
else if (status == INVALID_FORMAT)
INVALID_FORMAT_ERROR(fn);
/* read metadata */
luaL_loadstring(L, read_param_metadata(L, fp, fn));
CHECK_FORMAT(lua_pcall(L, 0, 1, 0), 0, fn);
CHECK_FORMAT(lua_istable(L, -1), 1, fn);
/* chunk info */
pci = (ParamChunkInfo *)malloc(sizeof(ParamChunkInfo));
pci->offset = ftello(fp);
pci->length = param_len - (pci->offset - offset);
fprintf(stderr, "%d + %d (skip %d)\n", (int)pci->offset,
(int)pci->length, param_len);
luaT_pushudata(L, pci, nerv_param_chunk_info_tname);
lua_setfield(L, -2, "chunk");
lua_rawseti(L, -2, i);
}
lua_setfield(L, -2, "metadata");
lfp = (ParamFileHandle *)malloc(sizeof(ParamFileHandle));
lfp->fp = fp;
luaT_pushudata(L, lfp, nerv_param_file_handle_tname);
lua_setfield(L, -2, "handle");
luaT_pushmetatable(L, nerv_param_file_tname);
lua_setmetatable(L, -2);
return 1;
}
int nerv_param_file___init(lua_State *L) {
const char *fn = luaL_checkstring(L, 2);
const char *mode = luaL_checkstring(L, 3);
int rd = 1, bin = 0;
size_t i, len = strlen(mode);
lua_pushvalue(L, 1);
for (i = 0; i < len; i++)
switch (mode[i])
{
case 'r': rd = 1; break;
case 'w': rd = 0; break;
case 'b': bin = 1; break;
}
return rd ? nerv_param_file_open_read(L, fn) : \
nerv_param_file_open_write(L, fn);
}
int nerv_param_file_new(lua_State *L) {
const char *fn = luaL_checkstring(L, 1);
const char *mode = luaL_checkstring(L, 2);
int rd = 1, bin = 0;
size_t i, len = strlen(mode);
for (i = 0; i < len; i++)
switch (mode[i])
{
case 'r': rd = 1; break;
case 'w': rd = 0; break;
case 'b': bin = 1; break;
}
lua_newtable(L);
return rd ? nerv_param_file_open_read(L, fn) : \
nerv_param_file_open_write(L, fn);
}
int nerv_param_file_get_chunkdata(lua_State *L) {
ParamFileHandle *pfh;
ParamChunkInfo *pci;
int k = luaL_checkinteger(L, 2);
lua_getfield(L, 1, "handle");
pfh = luaT_checkudata(L, -1, nerv_param_file_handle_tname);
lua_pop(L, 1); /* pop handle */
lua_getfield(L, 1, "metadata");
/* now stack: self, k, metadata */
lua_rawgeti(L, -1, k);
/* now stack: self, k, metadata, ith{} */
lua_getfield(L, -1, "chunk");
pci = luaT_checkudata(L, -1, nerv_param_chunk_info_tname);
luaT_pushudata(L, get_param_chunk_data(pfh->fp, pci),
nerv_param_chunk_data_tname);
return 1;
}
int nerv_param_file_handle_destroy(lua_State *L) {
ParamFileHandle *pfh = luaT_checkudata(L, 1,
nerv_param_file_handle_tname);
fclose(pfh->fp);
free(pfh);
return 0;
}
static int nerv_param_chunk_destroy(lua_State *L) {
ParamChunkInfo *pci = luaT_checkudata(L, 1, nerv_param_chunk_info_tname);
free(pci);
return 0;
}
static int nerv_param_chunk_data_destroy(lua_State *L) {
ParamChunkData *pcd = luaT_checkudata(L, 1, nerv_param_chunk_data_tname);
fclose(pcd->fp);
free(pcd->data);
free(pcd);
return 0;
}
static const luaL_Reg nerv_param_file_methods[] = {
{"get_chunkdata", nerv_param_file_get_chunkdata},
{"__init", nerv_param_file___init},
{NULL, NULL}
};
void nerv_param_file_init(lua_State *L) {
luaT_newmetatable(L, nerv_param_file_tname, NULL,
nerv_param_file_new,
NULL, NULL);
luaL_register(L, NULL, nerv_param_file_methods);
lua_pop(L, 1);
luaT_newmetatable(L, nerv_param_file_handle_tname, NULL,
NULL, nerv_param_file_handle_destroy, NULL);
luaT_newmetatable(L, nerv_param_chunk_info_tname, NULL,
NULL, nerv_param_chunk_destroy, NULL);
luaT_newmetatable(L, nerv_param_chunk_data_tname, NULL,
NULL, nerv_param_chunk_data_destroy, NULL);
}
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