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Tweaked lump reading functionality.

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-Removed functions exclusively used by W_ReadLumpHeaderPwad.
-Merged those functions into the main one, optimized the structure.
This commit is contained in:
Nevur 2017-05-02 15:40:31 +02:00
parent 1b881afb99
commit 9246ab8429
1 changed files with 49 additions and 79 deletions
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128
src/w_wad.c
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@ -983,80 +983,10 @@ size_t W_LumpLength(lumpnum_t lumpnum)
return W_LumpLengthPwad(WADFILENUM(lumpnum),LUMPNUM(lumpnum));
}
/** Reads bytes from the head of a lump, without doing decompression.
*
* \param wad Wad number to read from.
* \param lump Lump number to read from, within wad.
* \param dest Buffer in memory to serve as destination.
* \param size Number of bytes to read.
* \param offest Number of bytes to offset.
* \return Number of bytes read (should equal size).
* \sa W_ReadLumpHeader
*/
static size_t W_RawReadLumpHeader(UINT16 wad, UINT16 lump, void *dest, size_t size, size_t offset)
{
size_t bytesread;
lumpinfo_t *l;
FILE *handle;
l = wadfiles[wad]->lumpinfo + lump;
handle = wadfiles[wad]->handle;
fseek(handle, (long)(l->position + offset), SEEK_SET);
bytesread = fread(dest, 1, size, handle);
return bytesread;
}
// Read a compressed lump; return it in newly Z_Malloc'd memory.
// wad is number of wad file, lump is number of lump in wad.
static void *W_ReadCompressedLump(UINT16 wad, UINT16 lump)
{
#ifdef ZWAD
char *compressed, *data;
const lumpinfo_t *l = &wadfiles[wad]->lumpinfo[lump];
size_t retval;
compressed = Z_Malloc(l->disksize, PU_STATIC, NULL);
data = Z_Malloc(l->size, PU_STATIC, NULL);
if (W_RawReadLumpHeader(wad, lump, compressed, l->disksize, 0)
< l->disksize)
{
I_Error("wad %d, lump %d: cannot read compressed data",
wad, lump);
}
retval = lzf_decompress(compressed, l->disksize, data, l->size);
#ifndef AVOID_ERRNO
if (retval == 0 && errno == E2BIG)
{
I_Error("wad %d, lump %d: compressed data too big "
"(bigger than %s)", wad, lump, sizeu1(l->size));
}
else if (retval == 0 && errno == EINVAL)
I_Error("wad %d, lump %d: invalid compressed data", wad, lump);
else
#endif
if (retval != l->size)
{
I_Error("wad %d, lump %d: decompressed to wrong number of "
"bytes (expected %s, got %s)", wad, lump,
sizeu1(l->size), sizeu2(retval));
}
Z_Free(compressed);
return data;
#else
(void)wad;
(void)lump;
//I_Error("ZWAD files not supported on this platform.");
return NULL;
#endif
}
/** Reads bytes from the head of a lump.
* Note: If the lump is compressed, the whole thing has to be read anyway.
*
* \param wad Wad number to read from.
* \param lump Lump number to read from.
* \param dest Buffer in memory to serve as destination.
* \param size Number of bytes to read.
@ -1067,6 +997,9 @@ static void *W_ReadCompressedLump(UINT16 wad, UINT16 lump)
size_t W_ReadLumpHeaderPwad(UINT16 wad, UINT16 lump, void *dest, size_t size, size_t offset)
{
size_t lumpsize;
size_t bytesread;
lumpinfo_t *l;
FILE *handle;
if (!TestValidLump(wad,lump))
return 0;
@ -1080,20 +1013,57 @@ size_t W_ReadLumpHeaderPwad(UINT16 wad, UINT16 lump, void *dest, size_t size, si
if (!size || size+offset > lumpsize)
size = lumpsize - offset;
//
// Let's get the raw lump data.
// We setup the desired file handle to read the lump data.
l = wadfiles[wad]->lumpinfo + lump;
handle = wadfiles[wad]->handle;
fseek(handle, (long)(l->position + offset), SEEK_SET);
switch(wadfiles[wad]->lumpinfo[lump].compression)
{
case CM_LZF:
case CM_NONE: // If it's uncompressed, we directly write the data into our destination, and return the bytes read.
return fread(dest, 1, size, handle);
case CM_LZF: // Is it LZF compressed?
{
UINT8 *data;
data = W_ReadCompressedLump(wad, lump);
if (!data) return 0;
M_Memcpy(dest, data+offset, size);
Z_Free(data);
#ifdef ZWAD
char *rawData; // The lump's raw data.
char *decData; // Lump's decompressed real data.
size_t retval; // Helper var, lzf_decompress 0 when an error occurs.
rawData = Z_Malloc(l->disksize, PU_STATIC, NULL);
decData = Z_Malloc(l->size, PU_STATIC, NULL);
if (fread(rawData, 1, l->disksize, handle) < l->disksize)
I_Error("wad %d, lump %d: cannot read compressed data", wad, lump);
retval = lzf_decompress(rawData, l->disksize, decData, l->size);
#ifndef AVOID_ERRNO
if (retval == 0 && errno == E2BIG) // errno is a global var set by the lzf functions when something goes wrong.
{
I_Error("wad %d, lump %d: compressed data too big (bigger than %s)", wad, lump, sizeu1(l->size));
}
else if (retval == 0 && errno == EINVAL)
I_Error("wad %d, lump %d: invalid compressed data", wad, lump);
else
#endif
if (retval != l->size)
{
I_Error("wad %d, lump %d: decompressed to wrong number of bytes (expected %s, got %s)", wad, lump, sizeu1(l->size), sizeu2(retval));
}
#else
(void)wad;
(void)lump;
//I_Error("ZWAD files not supported on this platform.");
return NULL;
#endif
if (!decData) // Did we get no data at all?
return 0;
M_Memcpy(dest, decData + offset, size);
Z_Free(rawData);
Z_Free(decData);
return size;
}
default:
return W_RawReadLumpHeader(wad, lump, dest, size, offset);
return fread(dest, 1, size, handle);
}
}