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Diffstat (limited to 'WWW/Library/Implementation/HTChunk.h')
| -rw-r--r-- | WWW/Library/Implementation/HTChunk.h | 228 |
1 files changed, 228 insertions, 0 deletions
diff --git a/WWW/Library/Implementation/HTChunk.h b/WWW/Library/Implementation/HTChunk.h new file mode 100644 index 0000000..fa51c99 --- /dev/null +++ b/WWW/Library/Implementation/HTChunk.h @@ -0,0 +1,228 @@ +/* + * $LynxId: HTChunk.h,v 1.21 2020/01/21 22:02:43 tom Exp $ + * + * HTChunk: Flexible array handling for libwww + * CHUNK HANDLING: + * FLEXIBLE ARRAYS + * + * This module implements a flexible array. It is a general utility module. A + * chunk is a structure which may be extended. These routines create and + * append data to chunks, automatically reallocating them as necessary. + * + */ +#ifndef HTCHUNK_H +#define HTCHUNK_H 1 + +#ifndef HTUTILS_H +#include <HTUtils.h> +#endif + +#include <UCMap.h> + +#ifdef __cplusplus +extern "C" { +#endif + typedef struct _HTChunk HTChunk; + + struct _HTChunk { + int size; /* In bytes */ + int growby; /* Allocation unit in bytes */ + int allocated; /* Current size of *data */ + char *data; /* Pointer to malloc'd area or 0 */ + int failok; /* allowed to fail without exiting program? */ + HTChunk *next; /* pointer to the next chunk */ + }; + +/* + * Initialize a chunk's allocation data and allocation-increment. + */ + extern void HTChunkInit(HTChunk *ch, int grow); + +/* + * + * Create new chunk + * + * ON ENTRY, + * + * growby The number of bytes to allocate at a time when the chunk + * is later extended. Arbitrary but normally a trade-off + * of time vs memory. + * + * ON EXIT, + * + * returns A chunk pointer to the new chunk, + * + */ + + extern HTChunk *HTChunkCreate(int growby); + +/* + * Create a chunk for which an allocation error is not a fatal application + * error if failok != 0, but merely resets the chunk. When using a chunk + * created this way, the caller should always check whether the contents + * are ok each time after data have been appended. + * The create call may also fail and will return NULL in that case. - kw + */ + extern HTChunk *HTChunkCreateMayFail(int growby, int failok); + +/* + * Like HTChunkCreate but with initial allocation - kw + * + */ + extern HTChunk *HTChunkCreate2(int growby, size_t needed); + +/* + * + * Free a chunk + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * ON EXIT, + * + * ch is invalid and may not be used. + * + */ + + extern void HTChunkFree(HTChunk *ch); + +/* + * + * Clear a chunk + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * ON EXIT, + * + * *ch The size of the chunk is zero. + * + */ + + extern void HTChunkClear(HTChunk *ch); + +/* + * + * Realloc a chunk + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * growby growby + * + * ON EXIT, + * + * *ch Expanded by growby + * + */ + + extern BOOL HTChunkRealloc(HTChunk *ch, int growby); + +/* + * + * Ensure a chunk has a certain space in + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * s The size required + * + * ON EXIT, + * + * *ch Has size at least s + * + */ + + extern void HTChunkEnsure(HTChunk *ch, int s); + +/* + * + * Append a character to a chunk + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * c The character to be appended + * + * ON EXIT, + * + * *ch Is one character bigger + * + */ + extern void HTChunkPutc(HTChunk *ch, unsigned c); + + extern void HTChunkPutb(HTChunk *ch, const char *b, int l); + + extern void HTChunkPutUtf8Char(HTChunk *ch, UCode_t code); + +/* + * Append a string to a chunk + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * str Points to a zero-terminated string to be appended + * + * ON EXIT, + * + * *ch Is bigger by strlen(str) + * + */ + + extern void HTChunkPuts(HTChunk *ch, const char *str); + +/* + * + * Append a zero character to a chunk + * + */ + +/* + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * ON EXIT, + * + * *ch Is one character bigger + * + */ + + extern void HTChunkTerminate(HTChunk *ch); + +/* like the above but no realloc: extend to another chunk if necessary */ +/* + * + * Append a character (string, data) to a chunk + * + * ON ENTRY, + * + * ch A valid chunk pointer made by HTChunkCreate() + * + * c The character to be appended + * + * ON EXIT, + * + * returns original chunk or a pointer to the new chunk + * (original chunk is referenced to the new one + * by the field 'next') + * + */ + extern HTChunk *HTChunkPutc2(HTChunk *ch, int c); + extern HTChunk *HTChunkPuts2(HTChunk *ch, const char *str); + extern HTChunk *HTChunkPutb2(HTChunk *ch, const char *b, int l); + +/* New pool infrastructure: UNlike the above, store data using alignment */ + extern HTChunk *HTChunkPutb0(HTChunk *ch, const char *b, int l); + +#ifdef __cplusplus +} +#endif +#endif /* HTCHUNK_H */ |