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(svn r3624) - CodeChange: Some cosmetic changes in the saveload code;

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- hide and validate variable-size calculation (SlCalcConvMemLen/SlCalcConvFileLen)
   - some signed/unsigned fixes
   - handle conditional variables the same way for global -and struct types, through checking version_from and version_to
This commit is contained in:
Darkvater
2006-02-20 19:04:18 +00:00
parent 1abf991e7b
commit c36746058a
2 changed files with 104 additions and 96 deletions
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124
saveload.c
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@@ -96,6 +96,33 @@ static void SlReadFill(void)
static inline uint32 SlGetOffs(void) {return _sl.offs_base - (_sl.bufe - _sl.bufp);}
/** Return the size in bytes of a certain type of normal/atomic variable
* as it appears in memory. @see VarTypes
* @param conv @VarType type of variable that is used for calculating the size
* @return Return the size of this type in bytes */
static inline byte SlCalcConvMemLen(VarType conv)
{
static const byte conv_mem_size[] = {1, 1, 2, 2, 4, 4, 8, 8, 0};
byte length = (conv >> 4) & 0xF;
assert(length < lengthof(conv_mem_size));
return conv_mem_size[length];
}
/** Return the size in bytes of a certain type of normal/atomic variable
* as it appears in a saved game. @see VarTypes
* @param conv @VarType type of variable that is used for calculating the size
* @return Return the size of this type in bytes */
static inline byte SlCalcConvFileLen(VarType conv)
{
static const byte conv_file_size[] = {1, 1, 2, 2, 4, 4, 8, 8, 2};
byte length = conv & 0xF;
assert(length < lengthof(conv_file_size));
return conv_file_size[length];
}
/* Return the size in bytes of a reference (pointer) */
static inline size_t SlCalcRefLen(void) {return 2;}
/** Flush the output buffer by writing to disk with the given reader.
* If the buffer pointer has not yet been set up, set it up now. Usually
* only called when the buffer is full, or there is no more data to be processed
@@ -128,14 +155,14 @@ static void NORETURN SlError(const char *msg)
* flush it to its final destination
* @return return the read byte from file
*/
static inline int SlReadByteInternal(void)
static inline byte SlReadByteInternal(void)
{
if (_sl.bufp == _sl.bufe) SlReadFill();
return *_sl.bufp++;
}
/** Wrapper for SlReadByteInternal */
int SlReadByte(void) {return SlReadByteInternal();}
byte SlReadByte(void) {return SlReadByteInternal();}
/** Write away a single byte from memory. If the temporary buffer is full,
* flush it to its destination (file)
@@ -252,10 +279,10 @@ static inline uint SlGetGammaLength(uint i) {
return 1 + (i >= (1 << 7)) + (i >= (1 << 14)) + (i >= (1 << 21));
}
static inline int SlReadSparseIndex(void) {return SlReadSimpleGamma();}
static inline uint SlReadSparseIndex(void) {return SlReadSimpleGamma();}
static inline void SlWriteSparseIndex(uint index) {SlWriteSimpleGamma(index);}
static inline int SlReadArrayLength(void) {return SlReadSimpleGamma();}
static inline uint SlReadArrayLength(void) {return SlReadSimpleGamma();}
static inline void SlWriteArrayLength(uint length) {SlWriteSimpleGamma(length);}
void SlSetArrayIndex(uint index)
@@ -288,7 +315,7 @@ int SlIterateArray(void)
next_offs = SlGetOffs() + length;
switch (_sl.block_mode) {
case CH_SPARSE_ARRAY: index = SlReadSparseIndex(); break;
case CH_SPARSE_ARRAY: index = (int)SlReadSparseIndex(); break;
case CH_ARRAY: index = _sl.array_index++; break;
default:
DEBUG(misc, 0) ("[Sl] SlIterateArray: error");
@@ -306,6 +333,8 @@ int SlIterateArray(void)
*/
void SlSetLength(size_t length)
{
assert(_sl.save);
switch (_sl.need_length) {
case NL_WANTLENGTH:
_sl.need_length = NL_NONE;
@@ -439,25 +468,6 @@ static void SlSaveLoadConv(void *ptr, VarType conv)
}
}
/* Length in bytes of the various datatypes in a savefile. These
* sizes are guaranteed by assert_compiles in stdafx.h */
static const byte _conv_lengths[] = {1, 1, 2, 2, 4, 4, 8, 8, 2};
/**
* Return the size in bytes of a certain type of normal/atomic variable
* @param conv @VarType type of variable that is used for calculating the size
* @return Return the size of this type in byes
*/
static inline size_t SlCalcConvLen(VarType conv)
{
return _conv_lengths[conv & 0xF];
}
/**
* Return the size in bytes of a reference (pointer)
*/
static inline size_t SlCalcRefLen(void) {return 2;}
/**
* Return the size in bytes of a certain type of atomic array
* @param length The length of the array counted in elements
@@ -465,7 +475,7 @@ static inline size_t SlCalcRefLen(void) {return 2;}
*/
static inline size_t SlCalcArrayLen(uint length, VarType conv)
{
return _conv_lengths[conv & 0xF] * length;
return SlCalcConvFileLen(conv) * length;
}
/**
@@ -476,41 +486,46 @@ static inline size_t SlCalcArrayLen(uint length, VarType conv)
*/
void SlArray(void *array, uint length, VarType conv)
{
static const byte conv_mem_size[] = {1, 1, 2, 2, 4, 4, 8, 8, 0};
// Automatically calculate the length?
if (_sl.need_length != NL_NONE) {
SlSetLength(SlCalcArrayLen(length, conv));
// Determine length only?
if (_sl.need_length == NL_CALCLENGTH)
return;
if (_sl.need_length == NL_CALCLENGTH) return;
}
/* NOTICE - handle some buggy stuff, in really old versions everything was saved
* as a byte-type. So detect this, and adjust array size accordingly */
if (!_sl.save && _sl_version == 0) {
if (conv == SLE_INT16 || conv == SLE_UINT16 || conv == SLE_STRINGID) {
length *= 2; // int16, uint16 and StringID are 2 bytes in size
conv = SLE_INT8;
} else if (conv == SLE_INT32 || conv == SLE_UINT32) {
length *= 4; // int32 and uint32 are 4 bytes in size
if (conv == SLE_INT16 || conv == SLE_UINT16 || conv == SLE_STRINGID ||
conv == SLE_INT32 || conv == SLE_UINT32) {
length *= SlCalcConvFileLen(conv);
conv = SLE_INT8;
}
}
/* If the size of elements is 1 byte, no special conversion is needed,
* use specialized copy-to-copy function to speed up things */
/* If the size of elements is 1 byte both in file and memory, no special
* conversion is needed, use specialized copy-copy function to speed up things */
if (conv == SLE_INT8 || conv == SLE_UINT8) {
SlCopyBytes(array, length);
} else {
byte *a = (byte*)array;
byte mem_size = SlCalcConvMemLen(conv);
for (; length != 0; length --) {
SlSaveLoadConv(a, conv);
a += conv_mem_size[(conv >> 4) & 0xF]; // get size
a += mem_size; // get size
}
}
}
/* Are we going to save this object or not? */
static inline bool SlIsObjectValidInSavegame(const SaveLoad *sld)
{
if (_sl_version < sld->version_from || _sl_version > sld->version_to) return false;
return true;
}
/**
* Calculate the size of an object.
* @param sld The @SaveLoad description of the object so we know how to manipulate it
@@ -522,19 +537,13 @@ static size_t SlCalcObjLength(const SaveLoad *sld)
// Need to determine the length and write a length tag.
for (; sld->cmd != SL_END; sld++) {
if (sld->cmd < SL_WRITEBYTE) {
if (HASBIT(sld->cmd, 2)) {
// check if the field is used in the current savegame version
if (_sl_version < sld->version_from || _sl_version > sld->version_to)
continue;
}
/* CONDITIONAL saveload types depend on the savegame version */
if (!SlIsObjectValidInSavegame(sld)) continue;
switch (sld->cmd) {
case SL_VAR: case SL_CONDVAR: /* Normal Variable */
length += SlCalcConvLen(sld->type); break;
case SL_REF: case SL_CONDREF: /* Reference variable */
length += SlCalcRefLen(); break;
case SL_ARR: case SL_CONDARR: /* Array */
length += SlCalcArrayLen(sld->length, sld->type); break;
case SL_VAR: length += SlCalcConvFileLen(sld->type); break;
case SL_REF: length += SlCalcRefLen(); break;
case SL_ARR: length += SlCalcArrayLen(sld->length, sld->type); break;
default: NOT_REACHED();
}
} else if (sld->cmd == SL_WRITEBYTE) {
@@ -557,8 +566,7 @@ void SlObject(void *object, const SaveLoad *sld)
// Automatically calculate the length?
if (_sl.need_length != NL_NONE) {
SlSetLength(SlCalcObjLength(sld));
if (_sl.need_length == NL_CALCLENGTH)
return;
if (_sl.need_length == NL_CALCLENGTH) return;
}
for (; sld->cmd != SL_END; sld++) {
@@ -566,24 +574,18 @@ void SlObject(void *object, const SaveLoad *sld)
if (sld->cmd < SL_WRITEBYTE) {
/* CONDITIONAL saveload types depend on the savegame version */
if (HASBIT(sld->cmd, 2)) {
// check if the field is of the right version, if not, proceed to next one
if (_sl_version < sld->version_from || _sl_version > sld->version_to)
continue;
}
if (!SlIsObjectValidInSavegame(sld)) continue;
switch (sld->cmd) {
case SL_VAR: case SL_CONDVAR: /* Normal variable */
SlSaveLoadConv(ptr, sld->type); break;
case SL_REF: case SL_CONDREF: /* Reference variable, translate */
case SL_VAR: SlSaveLoadConv(ptr, sld->type); break;
case SL_REF: /* Reference variable, translate */
/// @todo XXX - another artificial limitof 65K elements of pointers?
if (_sl.save) { // XXX - read/write pointer as uint16? What is with higher indeces?
SlWriteUint16(_sl.ref_to_int_proc(*(void**)ptr, sld->type));
} else
*(void**)ptr = _sl.int_to_ref_proc(SlReadUint16(), sld->type);
break;
case SL_ARR: case SL_CONDARR: /* Array */
SlArray(ptr, sld->length, sld->type); break;
case SL_ARR: SlArray(ptr, sld->length, sld->type); break;
default: NOT_REACHED();
}
@@ -618,7 +620,7 @@ static size_t SlCalcGlobListLength(const SaveLoadGlobVarList *desc)
for (; desc->address != NULL; desc++) {
// Of course the global variable must exist in the sought savegame version
if (_sl_version >= desc->from_version && _sl_version <= desc->to_version)
length += SlCalcConvLen(desc->conv);
length += SlCalcConvFileLen(desc->conv);
}
return length;
}