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-rw-r--r--WWW/Library/Implementation/HTChunk.c335
1 files changed, 335 insertions, 0 deletions
diff --git a/WWW/Library/Implementation/HTChunk.c b/WWW/Library/Implementation/HTChunk.c
new file mode 100644
index 0000000..b9490fd
--- /dev/null
+++ b/WWW/Library/Implementation/HTChunk.c
@@ -0,0 +1,335 @@
+/*
+ * $LynxId: HTChunk.c,v 1.29 2023/04/10 22:58:51 tom Exp $
+ *
+ * Chunk handling: Flexible arrays
+ * ===============================
+ *
+ */
+
+#include <HTUtils.h>
+#include <HTChunk.h>
+
+#include <LYLeaks.h>
+
+/*
+ * Initialize a chunk with a certain allocation unit
+ */
+void HTChunkInit(HTChunk *ch, int grow)
+{
+ ch->data = 0;
+ ch->growby = grow;
+ ch->size = 0;
+ ch->allocated = 0;
+}
+
+/* Create a chunk with a certain allocation unit
+ * --------------
+ */
+HTChunk *HTChunkCreate(int grow)
+{
+ HTChunk *ch = typecalloc(HTChunk);
+
+ if (ch == NULL)
+ outofmem(__FILE__, "creation of chunk");
+
+ HTChunkInit(ch, grow);
+ return ch;
+}
+
+HTChunk *HTChunkCreateMayFail(int grow, int failok)
+{
+ HTChunk *ch = typecalloc(HTChunk);
+
+ if (ch == NULL) {
+ if (!failok) {
+ outofmem(__FILE__, "creation of chunk");
+ } else {
+ return ch;
+ }
+ }
+
+ HTChunkInit(ch, grow);
+ ch->failok = failok;
+ return ch;
+}
+
+/* Create a chunk with a certain allocation unit and ensured size
+ * --------------
+ */
+HTChunk *HTChunkCreate2(int grow, size_t needed)
+{
+ HTChunk *ch = typecalloc(HTChunk);
+
+ if (ch == NULL)
+ outofmem(__FILE__, "HTChunkCreate2");
+
+ HTChunkInit(ch, grow);
+ if (needed-- > 0) {
+ /* Round up */
+ ch->allocated = (int) (needed - (needed % (size_t) ch->growby)
+ + (unsigned) ch->growby);
+ CTRACE((tfp, "HTChunkCreate2: requested %d, allocate %u\n",
+ (int) needed, (unsigned) ch->allocated));
+ ch->data = typecallocn(char, (unsigned) ch->allocated);
+
+ if (!ch->data)
+ outofmem(__FILE__, "HTChunkCreate2 data");
+ }
+ return ch;
+}
+
+/* Clear a chunk of all data
+ * --------------------------
+ */
+void HTChunkClear(HTChunk *ch)
+{
+ FREE(ch->data);
+ ch->size = 0;
+ ch->allocated = 0;
+}
+
+/* Free a chunk (and it's chain, if any)
+ * -------------------------------------
+ */
+void HTChunkFree(HTChunk *ch)
+{
+ HTChunk *next;
+
+ do {
+ next = ch->next;
+ FREE(ch->data);
+ FREE(ch);
+ ch = next;
+ } while (ch != NULL);
+}
+
+/* Realloc the chunk
+ * -----------------
+ */
+BOOL HTChunkRealloc(HTChunk *ch, int growby)
+{
+ char *data;
+
+ ch->allocated = ch->allocated + growby;
+
+ data = (ch->data
+ ? typeRealloc(char, ch->data, ch->allocated)
+ : typecallocn(char, ch->allocated));
+
+ if (data) {
+ ch->data = data;
+ } else if (ch->failok) {
+ HTChunkClear(ch); /* allocation failed, clear all data - kw */
+ return FALSE; /* caller should check ch->allocated - kw */
+ } else {
+ outofmem(__FILE__, "HTChunkRealloc");
+ }
+ return TRUE;
+}
+
+/* Append a character
+ * ------------------
+ */
+void HTChunkPutc(HTChunk *ch, unsigned c)
+{
+ if (ch->size >= ch->allocated) {
+ if (!HTChunkRealloc(ch, ch->growby))
+ return;
+ }
+ ch->data[ch->size++] = (char) c;
+}
+
+/* like above but no realloc: extend to another chunk if necessary */
+HTChunk *HTChunkPutc2(HTChunk *ch, int c)
+{
+ if (ch->size >= ch->allocated) {
+ HTChunk *chunk = HTChunkCreateMayFail(ch->growby, ch->failok);
+
+ ch->next = chunk;
+ ch = chunk;
+ HTChunkPutc(ch, UCH(c));
+ } else {
+ ch->data[ch->size++] = (char) c;
+ }
+ return ch;
+}
+
+/* Ensure a certain size
+ * ---------------------
+ */
+void HTChunkEnsure(HTChunk *ch, int needed)
+{
+ if (needed <= ch->allocated)
+ return;
+ ch->allocated = needed - 1 - ((needed - 1) % ch->growby)
+ + ch->growby; /* Round up */
+ ch->data = (ch->data
+ ? typeRealloc(char, ch->data, ch->allocated)
+ : typecallocn(char, ch->allocated));
+
+ if (ch->data == NULL)
+ outofmem(__FILE__, "HTChunkEnsure");
+}
+
+/*
+ * Append a block of characters.
+ */
+void HTChunkPutb(HTChunk *ch, const char *b, int l)
+{
+ if (l <= 0)
+ return;
+ if (ch->size + l > ch->allocated) {
+ int growby = l - (l % ch->growby) + ch->growby; /* Round up */
+
+ if (!HTChunkRealloc(ch, growby))
+ return;
+ }
+ MemCpy(ch->data + ch->size, b, l);
+ ch->size += l;
+}
+
+/* like above but no realloc: extend to another chunk if necessary */
+HTChunk *HTChunkPutb2(HTChunk *ch, const char *b, int l)
+{
+ if (l <= 0)
+ return ch;
+ if (ch->size + l > ch->allocated) {
+ HTChunk *chunk;
+ int m = ch->allocated - ch->size;
+
+ if (m != 0 && b != 0) {
+ MemCpy(ch->data + ch->size, b, (unsigned) m);
+ ch->size += m;
+ }
+
+ chunk = HTChunkCreateMayFail(ch->growby, ch->failok);
+ ch->next = chunk;
+ ch = chunk;
+ if (b != 0)
+ HTChunkPutb(ch, b + m, l - m);
+ } else {
+ MemCpy(ch->data + ch->size, b, (unsigned) l);
+ ch->size += l;
+ }
+ return ch;
+}
+
+#define PUTC(code) ch->data[ch->size++] = (char)(code)
+#define PUTC2(code) ch->data[ch->size++] = (char)(0x80|(0x3f &(code)))
+
+/*
+ * Append a character encoded as UTF-8.
+ */
+void HTChunkPutUtf8Char(HTChunk *ch, UCode_t code)
+{
+ int utflen;
+
+ if (TOASCII(code) < 128)
+ utflen = 1;
+ else if (code < 0x800L) {
+ utflen = 2;
+ } else if (code < 0x10000L) {
+ utflen = 3;
+ } else if (code < 0x200000L) {
+ utflen = 4;
+ } else if (code < 0x4000000L) {
+ utflen = 5;
+ } else if (code <= 0x7fffffffL) {
+ utflen = 6;
+ } else
+ utflen = 0;
+
+ if (ch->size + utflen > ch->allocated) {
+ int growby = (ch->growby >= utflen) ? ch->growby : utflen;
+
+ if (!HTChunkRealloc(ch, growby))
+ return;
+ }
+
+ switch (utflen) {
+ case 0:
+ return;
+ case 1:
+ ch->data[ch->size++] = (char) code;
+ return;
+ case 2:
+ PUTC(0xc0 | (code >> 6));
+ break;
+ case 3:
+ PUTC(0xe0 | (code >> 12));
+ break;
+ case 4:
+ PUTC(0xf0 | (code >> 18));
+ break;
+ case 5:
+ PUTC(0xf8 | (code >> 24));
+ break;
+ case 6:
+ PUTC(0xfc | (code >> 30));
+ break;
+ }
+ switch (utflen) {
+ case 6:
+ PUTC2(code >> 24);
+ /* FALLTHRU */
+ case 5:
+ PUTC2(code >> 18);
+ /* FALLTHRU */
+ case 4:
+ PUTC2(code >> 12);
+ /* FALLTHRU */
+ case 3:
+ PUTC2(code >> 6);
+ /* FALLTHRU */
+ case 2:
+ PUTC2(code);
+ break;
+ }
+}
+
+/* Terminate a chunk
+ * -----------------
+ */
+void HTChunkTerminate(HTChunk *ch)
+{
+ HTChunkPutc(ch, (char) 0);
+}
+
+/* Append a string
+ * ---------------
+ */
+void HTChunkPuts(HTChunk *ch, const char *s)
+{
+ const char *p;
+
+ if (s != NULL) {
+ for (p = s; *p; p++) {
+ if (ch->size >= ch->allocated) {
+ if (!HTChunkRealloc(ch, ch->growby))
+ break;
+ }
+ ch->data[ch->size++] = *p;
+ }
+ }
+}
+
+/* like above but no realloc: extend to another chunk if necessary */
+HTChunk *HTChunkPuts2(HTChunk *ch, const char *s)
+{
+ const char *p;
+
+ if (s != NULL) {
+ for (p = s; *p; p++) {
+ if (ch->size >= ch->allocated) {
+ HTChunk *chunk = HTChunkCreateMayFail(ch->growby, ch->failok);
+
+ ch->next = chunk;
+ ch = chunk;
+ HTChunkPuts(ch, p);
+ break;
+ }
+ ch->data[ch->size++] = *p;
+ }
+ }
+ return ch;
+}
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