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started cundump.c:cosmoD_undump(); minor fixes
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parent
465f4d5e4a
commit
f116efa02c
15
src/cdump.c
15
src/cdump.c
@ -92,18 +92,12 @@ static void writeCObjFunction(DumpState *dstate, CObjFunction *obj)
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writeVector(dstate, obj->chunk.lineInfo, sizeof(int) * obj->chunk.count);
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/* write constants */
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writeSize(dstate, obj->chunk.constants.count);
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for (int i = 0; i < obj->chunk.constants.count; i++) {
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writeCValue(dstate, obj->chunk.constants.values[i]);
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}
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}
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#define WRITE_VAR(dstate, type, expression) \
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{ \
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type _tmp = expression; \
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writeBlock(dstate, &_tmp, sizeof(_tmp)); \
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break; \
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}
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static void writeCObj(DumpState *dstate, CObj *obj)
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{
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/*
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@ -132,6 +126,13 @@ static void writeCObj(DumpState *dstate, CObj *obj)
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}
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}
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#define WRITE_VAR(dstate, type, expression) \
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{ \
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type _tmp = expression; \
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writeBlock(dstate, &_tmp, sizeof(_tmp)); \
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break; \
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}
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static void writeCValue(DumpState *dstate, CValue val)
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{
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CosmoType t = GET_TYPE(val);
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@ -13,6 +13,7 @@ typedef int (*cosmo_Writer)(CState *state, const void *data, size_t size, const
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bool cosmoD_isBigEndian();
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/* returns non-zero on error */
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int cosmoD_dump(CState *state, CObjFunction *func, cosmo_Writer writer, const void *userData);
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#endif
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194
src/cundump.c
Normal file
194
src/cundump.c
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@ -0,0 +1,194 @@
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#include "cdump.h"
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#include "cundump.h"
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#include "cvm.h"
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#include "cchunk.h"
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typedef struct
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{
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CState *state;
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const void *userData;
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cosmo_Reader reader;
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int readerStatus;
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} UndumpState;
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#define check(e) if (!e) return false;
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static void initUndumpState(CState *state, UndumpState *udstate, cosmo_Reader reader,
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const void *userData)
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{
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udstate->state = state;
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udstate->userData = userData;
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udstate->reader = reader;
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udstate->readerStatus = 0;
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}
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static bool readBlock(UndumpState *udstate, void *data, size_t size)
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{
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if (udstate->readerStatus == 0) {
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udstate->readerStatus = udstate->reader(udstate->state, data, size, udstate->userData);
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}
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return udstate->readerStatus == 0;
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}
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static bool readu8(UndumpState *udstate, uint8_t *d)
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{
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return readBlock(udstate, d, sizeof(uint8_t));
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}
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static bool readu16(UndumpState *udstate, uint16_t *d)
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{
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return readBlock(udstate, d, sizeof(uint16_t));
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}
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static bool readSize(UndumpState *udstate, size_t *d)
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{
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return readBlock(udstate, d, sizeof(size_t));
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}
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static bool readVector(UndumpState *udstate, void **data, size_t *size)
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{
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check(readSize(udstate, size));
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*data = cosmoM_malloc(udstate->state, *size);
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return readBlock(udstate, *data, *size);
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}
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#define checku8(udstate, d, tmp) \
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check(readu8(udstate, &tmp)); \
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if (d != tmp) { \
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cosmoV_error(udstate->state, "bad header!"); \
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return false; \
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}
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static bool checkHeader(UndumpState *udstate) {
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char magic[COSMO_MAGIC_LEN];
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uint8_t tmp;
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/* check header */
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readBlock(udstate, magic, COSMO_MAGIC_LEN);
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if (memcmp(magic, COSMO_MAGIC, COSMO_MAGIC_LEN) != 0) {
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cosmoV_error(udstate->state, "bad header!");
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return false;
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}
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/* after the magic, we read some platform information */
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checku8(udstate, cosmoD_isBigEndian(), tmp);
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checku8(udstate, sizeof(cosmo_Number), tmp);
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checku8(udstate, sizeof(size_t), tmp);
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checku8(udstate, sizeof(int), tmp);
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return true;
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}
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#undef checku8
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static bool readCObjString(UndumpState *udstate, CObjString **str)
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{
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size_t size;
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char *data;
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check(readu32(udstate, &size));
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if (size == 0) { /* empty string */
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*str = NULL;
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return true;
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}
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*data = cosmoM_malloc(udstate->state, size+1);
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check(readBlock(udstate, (void *)&data, size));
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data[size] = '\0'; /* add NULL-terminator */
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*str = cosmoO_takeString(udstate->state, data, size);
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return true;
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}
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static bool readCObjFunction(UndumpState *udstate, CObjFunction **func) {
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*func = cosmoO_newFunction(udstate->state);
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check(readCObjString(udstate, &(*func)->name));
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check(readCObjString(udstate, &(*func)->module));
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check(readu32(udstate, &(*func)->args));
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check(readu32(udstate, &(*func)->upvals));
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check(readu8(udstate, &(*func)->variadic));
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/* read chunk info */
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check(readVector(udstate, (void **)&(*func)->chunk.buf, &(*func)->chunk.count));
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check(readVector(udstate, (void **)&(*func)->chunk.lineInfo, &(*func)->chunk.count));
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/* read constants */
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size_t constants;
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check(readSize(udstate, &constants));
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for (int i = 0; i < constants; i++) {
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CValue val;
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check(readCValue(udstate, &val));
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addConstant(udstate->state, &(*func)->chunk, val);
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}
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return true;
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}
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static bool readCObj(UndumpState *udstate, CObj **obj)
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{
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uint8_t type;
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check(readu8(udstate, &type));
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switch (type) {
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case COBJ_STRING:
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return readCObjString(udstate, (CObjString **)obj);
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case COBJ_FUNCTION:
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return readCObjFunction(udstate, (CObjFunction **)obj);
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default:
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cosmoV_error(udstate->state, "unknown object type!");
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return false;
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}
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return true;
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}
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#define READ_VAR(udstate, val, type, creator) \
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{ \
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type _tmp; \
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check(readBlock(udstate, &_tmp, sizeof(type))); \
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*val = creator(_tmp); \
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break; \
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}
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static bool readCValue(UndumpState *udstate, CValue *val) {
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uint8_t type;
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check(readu8(udstate, &type));
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switch (type) {
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case COSMO_TNUMBER:
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READ_VAR(udstate, val, cosmo_Number, cosmoV_newNumber)
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case COSMO_TBOOLEAN:
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READ_VAR(udstate, val, bool, cosmoV_newBoolean)
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case COSMO_TREF: {
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CObj *obj;
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check(readCObj(udstate, (CObj **)&obj));
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*val = cosmoV_newRef(obj);
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break;
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}
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case COSMO_TNIL:
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*val = cosmoV_newNil();
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break;
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default:
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break;
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}
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return true;
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}
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int cosmoD_undump(CState *state, CObjFunction *func, cosmo_Reader writer, const void *userData) {
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UndumpState udstate;
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initUndumpState(state, &udstate, writer, userData);
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if (!checkHeader(&udstate)) {
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return 1;
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}
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if (!readCObjFunction(&udstate, &func)) {
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return 1;
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}
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return udstate.readerStatus;
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}
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14
src/cundump.h
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14
src/cundump.h
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@ -0,0 +1,14 @@
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#ifndef COSMO_UNDUMP_H
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#define COSMO_UNDUMP_H
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#include "cobj.h"
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#include "cosmo.h"
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#include <stdio.h>
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typedef int (*cosmo_Reader)(CState *state, void *data, size_t size, const void *ud);
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/* returns non-zero on error */
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int cosmoD_undump(CState *state, CObjFunction *func, cosmo_Reader writer, const void *userData);
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#endif
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