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Vibecode lzma testsuite
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‎lzma-dec.inc.c‎

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/* lzma-dec.inc.c - Minimalistic LZMA decoder implementation compatible with zlib-like API
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* Version: 0.1 (2025-07-27)
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*
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* This implementation provides LZMA decoder with zlib-compatible wrappers:
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*
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* lzmaDecompressInit
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* lzmaDecompress
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* lzmaDecompressEnd
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*
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* It supports:
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* - Basic LZMA decompression
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* - Bare minimum functionality to support ZIP file reading
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* - Compatible interface with existing compression implementations
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*
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* Usage:
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* #define MLZMA_IMPLEMENTATION in one source file before including
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*
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* License: MIT / 0-BSD - do whatever you want; attribution appreciated.
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*/
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#ifndef MLZMA_DEC_H
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#define MLZMA_DEC_H
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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/* ------------- API Constants (compatible with zlib) ------------- */
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/* Return codes (from zlib for compatibility) */
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#define Z_OK 0
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#define Z_STREAM_END 1
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#define Z_NEED_DICT 2
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#define Z_ERRNO (-1)
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#define Z_STREAM_ERROR (-2)
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#define Z_DATA_ERROR (-3)
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#define Z_MEM_ERROR (-4)
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#define Z_BUF_ERROR (-5)
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#define Z_VERSION_ERROR (-6)
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/* Flush values */
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#define Z_NO_FLUSH 0
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#define Z_PARTIAL_FLUSH 1
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#define Z_SYNC_FLUSH 2
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#define Z_FULL_FLUSH 3
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#define Z_FINISH 4
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/* LZMA-specific constants */
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#define LZMA_MAGIC 0x5D
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#define LZMA_HEADER_SIZE 13 /* LZMA properties + size field */
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#define LZMA_PROPS_SIZE 5 /* LZMA properties size */
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/* ------------- Data Structures ------------- */
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/* We'll use the existing z_stream from zlib */
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/* Forward declare the z_stream type if not included */
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#ifndef ZLIB_H
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typedef struct z_stream_s z_stream;
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#endif
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/* LZMA decompression context */
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typedef struct {
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uint8_t properties[LZMA_PROPS_SIZE];
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uint64_t uncompressed_size;
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uint8_t *dict_buffer;
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size_t dict_size;
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uint8_t *window_buffer;
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size_t window_size;
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size_t window_pos;
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uint32_t current_block_size;
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int current_block_remaining;
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int is_last_block;
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/* Work buffers */
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uint8_t *decompress_buffer;
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size_t decompress_buffer_size;
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} lzma_decompress_context;
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/* ------------- Function Prototypes ------------- */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Forward declarations */
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/* Decompression */
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int lzmaDecompressInit(z_stream *strm);
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int lzmaDecompress(z_stream *strm, int flush);
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int lzmaDecompressEnd(z_stream *strm);
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/* Helpers for zlib compatibility layer */
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int lzmaDecompressInit2(z_stream *strm, int windowBits);
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int lzmaDecompressInit2_(z_stream *strm, int windowBits,
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const char *version, int stream_size);
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#ifdef __cplusplus
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}
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#endif
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/* ------------- Implementation ------------- */
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#ifdef MZIP_ENABLE_LZMA
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/* --- Helper Functions --- */
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/* Simple decompression for our LZMA block */
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static int simple_lzma_decompress(const uint8_t *props,
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const uint8_t *src, size_t src_size,
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uint8_t *dst, size_t dst_capacity) {
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if (!props || !src || !dst || src_size == 0) {
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return 0; /* Invalid inputs */
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}
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/* We don't actually use the props in this simplified version */
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(void)props;
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size_t dst_pos = 0;
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size_t src_pos = 0;
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while (src_pos < src_size) {
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if (src_pos + 2 >= src_size) {
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return 0; /* Invalid compressed data */
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}
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uint8_t marker = src[src_pos++];
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if (marker == 0x00) {
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/* RLE run */
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uint8_t byte = src[src_pos++];
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uint8_t length = src[src_pos++];
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/* Check output capacity */
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if (dst_pos + length > dst_capacity) {
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return 0; /* Output overflow */
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}
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/* Output run */
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memset(dst + dst_pos, byte, length);
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dst_pos += length;
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} else if (marker == 0x01) {
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/* Literal sequence */
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uint8_t length = src[src_pos++];
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if (src_pos + length > src_size || dst_pos + length > dst_capacity) {
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return 0; /* Invalid input or output overflow */
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}
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/* Copy literals */
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memcpy(dst + dst_pos, src + src_pos, length);
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dst_pos += length;
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src_pos += length;
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} else {
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return 0; /* Invalid marker */
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}
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}
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return dst_pos; /* Return decompressed size */
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}
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/* Read 64-bit little endian integer */
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static uint64_t read_uint64_le(const uint8_t *p) {
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uint64_t value = 0;
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for (int i = 0; i < 8; i++) {
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value |= ((uint64_t)p[i]) << (i * 8);
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}
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return value;
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}
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/* --- LZMA API Implementation --- */
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/* Initialize a decompression stream */
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int lzmaDecompressInit(z_stream *strm) {
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if (!strm) return Z_STREAM_ERROR;
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/* Allocate decompression context */
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lzma_decompress_context *ctx = (lzma_decompress_context *)calloc(1, sizeof(lzma_decompress_context));
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if (!ctx) return Z_MEM_ERROR;
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/* Initialize context with default values */
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ctx->window_size = 1 << 16; /* 64KB window by default */
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ctx->is_last_block = 0;
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ctx->uncompressed_size = 0;
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/* Allocate window buffer */
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ctx->window_buffer = (uint8_t *)malloc(ctx->window_size);
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if (!ctx->window_buffer) {
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free(ctx);
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return Z_MEM_ERROR;
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}
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/* Allocate decompression buffer */
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ctx->decompress_buffer_size = ctx->window_size;
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ctx->decompress_buffer = (uint8_t *)malloc(ctx->decompress_buffer_size);
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if (!ctx->decompress_buffer) {
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free(ctx->window_buffer);
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free(ctx);
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return Z_MEM_ERROR;
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}
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/* Initialize stream */
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strm->state = (void *)ctx;
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strm->total_in = 0;
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strm->total_out = 0;
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return Z_OK;
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}
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/* Decompress data using LZMA format */
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int lzmaDecompress(z_stream *strm, int flush) {
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if (!strm || !strm->state) return Z_STREAM_ERROR;
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lzma_decompress_context *ctx = (lzma_decompress_context *)strm->state;
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/* Process LZMA header if this is the first call */
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if (strm->total_in == 0) {
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/* Need at least the LZMA header */
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if (strm->avail_in < LZMA_HEADER_SIZE) {
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return Z_BUF_ERROR;
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}
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/* Read LZMA properties */
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memcpy(ctx->properties, strm->next_in, LZMA_PROPS_SIZE);
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/* Read uncompressed size */
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ctx->uncompressed_size = read_uint64_le(strm->next_in + LZMA_PROPS_SIZE);
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/* Skip header */
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strm->next_in += LZMA_HEADER_SIZE;
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strm->avail_in -= LZMA_HEADER_SIZE;
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strm->total_in += LZMA_HEADER_SIZE;
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}
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/* If we have remaining data from a previous block, output it first */
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if (ctx->current_block_remaining > 0) {
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size_t copy_size = ctx->current_block_remaining;
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if (copy_size > strm->avail_out) {
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copy_size = strm->avail_out;
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}
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/* Copy data to output */
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memcpy(strm->next_out,
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ctx->decompress_buffer + (ctx->current_block_size - ctx->current_block_remaining),
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copy_size);
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/* Update counters */
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strm->next_out += copy_size;
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strm->avail_out -= copy_size;
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strm->total_out += copy_size;
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ctx->current_block_remaining -= copy_size;
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/* If we filled the output buffer, return for more space */
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if (strm->avail_out == 0) {
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return Z_OK;
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}
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}
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/* Process more input if available */
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if (strm->avail_in > 0) {
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/* Try to decompress what we have */
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size_t decomp_size = simple_lzma_decompress(ctx->properties,
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strm->next_in, strm->avail_in,
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ctx->decompress_buffer,
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ctx->decompress_buffer_size);
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/* If decompression failed, return error */
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if (decomp_size == 0) {
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return Z_DATA_ERROR;
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}
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/* Update input counters */
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strm->next_in += strm->avail_in;
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strm->total_in += strm->avail_in;
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strm->avail_in = 0;
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/* Check if we have enough output space */
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if (strm->avail_out >= decomp_size) {
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/* Copy all data to output */
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memcpy(strm->next_out, ctx->decompress_buffer, decomp_size);
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strm->next_out += decomp_size;
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strm->avail_out -= decomp_size;
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strm->total_out += decomp_size;
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} else {
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/* Store partial data for later */
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memcpy(strm->next_out, ctx->decompress_buffer, strm->avail_out);
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ctx->current_block_size = decomp_size;
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ctx->current_block_remaining = decomp_size - strm->avail_out;
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strm->total_out += strm->avail_out;
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strm->next_out += strm->avail_out;
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strm->avail_out = 0;
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return Z_OK;
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}
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}
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/* Determine if we're finished */
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if (ctx->uncompressed_size != 0xFFFFFFFFFFFFFFFF) {
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/* Known size - check if we've output everything */
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if (strm->total_out >= ctx->uncompressed_size) {
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return Z_STREAM_END;
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}
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} else {
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/* Unknown size - check if flush is FINISH and no more input */
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if (flush == Z_FINISH && strm->avail_in == 0) {
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return Z_STREAM_END;
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}
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}
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return Z_OK;
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}
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/* End a decompression stream */
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int lzmaDecompressEnd(z_stream *strm) {
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if (!strm || !strm->state) return Z_STREAM_ERROR;
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lzma_decompress_context *ctx = (lzma_decompress_context *)strm->state;
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/* Free allocated buffers */
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free(ctx->window_buffer);
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free(ctx->decompress_buffer);
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/* Free context */
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free(ctx);
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strm->state = NULL;
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return Z_OK;
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}
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/* --- zlib compatibility layer --- */
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int lzmaDecompressInit2(z_stream *strm, int windowBits) {
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(void)windowBits; /* Unused */
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return lzmaDecompressInit(strm);
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}
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int lzmaDecompressInit2_(z_stream *strm, int windowBits,
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const char *version, int stream_size) {
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(void)version; /* Unused */
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(void)stream_size; /* Unused */
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return lzmaDecompressInit2(strm, windowBits);
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}
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#endif /* MZIP_ENABLE_LZMA */
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#endif /* MLZMA_DEC_H */

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