/* * $LynxId: HTChunk.c,v 1.21 2009/02/01 12:49:24 tom Exp $ * * Chunk handling: Flexible arrays * =============================== * */ #include #include #include /* * 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 - 1 - ((needed - 1) % 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 ? (char *) realloc(ch->data, (unsigned) ch->allocated) : typecallocn(char, (unsigned) 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, char c) { if (ch->size >= ch->allocated) { if (!HTChunkRealloc(ch, ch->growby)) return; } ch->data[ch->size++] = c; } /* like above but no realloc: extend to another chunk if necessary */ HTChunk *HTChunkPutc2(HTChunk *ch, char c) { if (ch->size >= ch->allocated) { HTChunk *chunk = HTChunkCreateMayFail(ch->growby, ch->failok); ch->next = chunk; HTChunkPutc(chunk, c); return chunk; } ch->data[ch->size++] = 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 ? (char *) realloc(ch->data, (unsigned) ch->allocated) : typecallocn(char, (unsigned) 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, (unsigned) 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; memcpy(ch->data + ch->size, b, (unsigned) m); ch->size += m; chunk = HTChunkCreateMayFail(ch->growby, ch->failok); ch->next = chunk; HTChunkPutb(chunk, b + m, l - m); return chunk; } 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)) return; } 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; HTChunkPuts(chunk, p); return chunk; } ch->data[ch->size++] = *p; } } return ch; }