55 lines
1.7 KiB
C
55 lines
1.7 KiB
C
// BLANKART
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//-----------------------------------------------------------------------------
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// Copyright (C) 2025 by Team BlanKart.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file strbuf.c
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/// \brief string buffer library, for making chunks of many small strings
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#include "doomdef.h"
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#include "strbuf.h"
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#include "z_zone.h"
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#define STRBUF_BLOCKSIZE 16384 // 16K pages are the future, son!
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// allocates and returns a new string buffer
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// free with Z_Free
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strbuf_t *strbuf_alloc(void)
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{
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strbuf_t *buf = Z_Malloc(STRBUF_BLOCKSIZE, PU_STATIC, NULL);
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if (!buf)
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I_Error("Failed to allocate string buffer");
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buf->size = sizeof(UINT32);
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return buf;
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}
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// appends a string to the buffer
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// returns an offset to the newly appended string
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UINT32 strbuf_append(strbuf_t **strbuf, const char *str)
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{
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return strbuf_write(strbuf, (UINT8 *)str, strlen(str)+1);
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}
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// writes a raw block of bytes to the buffer
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// returns an offset to the newly appended bytes
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UINT32 strbuf_write(strbuf_t **strbuf, const UINT8 *src, size_t len)
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{
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strbuf_t *buf = *strbuf;
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UINT32 oldsize = buf->size;
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buf->size += len;
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if ((oldsize % STRBUF_BLOCKSIZE) + len >= STRBUF_BLOCKSIZE) {
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UINT32 newsize = buf->size + STRBUF_BLOCKSIZE - (buf->size % STRBUF_BLOCKSIZE);
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if (newsize <= oldsize)
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I_Error("String buffer size wrapped around!?");
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buf = *strbuf = Z_Realloc(buf, newsize, PU_STATIC, NULL);
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if (!buf)
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I_Error("Failed to allocate string buffer");
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}
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memcpy(buf->buf - sizeof(UINT32) + oldsize, src, len);
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return oldsize;
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}
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