alone_encoder.c File Reference

Encoder for LZMA_Alone files. More...

#include "common.h"
#include "lzma_encoder.h"

Go to the source code of this file.

Classes
struct	lzma_alone_coder

Macros
#define	ALONE_HEADER_SIZE   (1 + 4 + 8)

Functions
static lzma_ret	alone_encode (void *coder_ptr, const lzma_allocator *allocator, const uint8_t *restrict in, size_t *restrict in_pos, size_t in_size, uint8_t *restrict out, size_t *restrict out_pos, size_t out_size, lzma_action action)
static void	alone_encoder_end (void *coder_ptr, const lzma_allocator *allocator)
static lzma_ret	alone_encoder_init (lzma_next_coder *next, const lzma_allocator *allocator, const lzma_options_lzma *options)
	LZMA_API (lzma_ret)

Detailed Description

Encoder for LZMA_Alone files.

Definition in file alone_encoder.c.

Macro Definition Documentation

ALONE_HEADER_SIZE

#define ALONE_HEADER_SIZE   (1 + 4 + 8)

Definition at line 17 of file alone_encoder.c.

Function Documentation

alone_encode()

static lzma_ret alone_encode ( void *  coder_ptr, const lzma_allocator *  allocator, const uint8_t *restrict  in, size_t *restrict  in_pos, size_t  in_size, uint8_t *restrict  out, size_t *restrict  out_pos, size_t  out_size, lzma_action  action  )

static

Definition at line 34 of file alone_encoder.c.

{
    lzma_alone_coder *coder = coder_ptr;
 
    while (*out_pos < out_size)
    switch (coder->sequence) {
    case SEQ_HEADER:
        lzma_bufcpy(coder->header, &coder->header_pos,
                ALONE_HEADER_SIZE,
                out, out_pos, out_size);
        if (coder->header_pos < ALONE_HEADER_SIZE)
            return LZMA_OK;
 
        coder->sequence = SEQ_CODE;
        break;
 
    case SEQ_CODE:
        return coder->next.code(coder->next.coder,
                allocator, in, in_pos, in_size,
                out, out_pos, out_size, action);
 
    default:
        assert(0);
        return LZMA_PROG_ERROR;
    }
 
    return LZMA_OK;
}

References test-lz4-speed::action, allocator, ALONE_HEADER_SIZE, assert(), lzma_next_coder_s::code, lzma_next_coder_s::coder, lzma_alone_coder::header, lzma_alone_coder::header_pos, in, in_pos, in_size, lzma_bufcpy(), LZMA_OK, LZMA_PROG_ERROR, lzma_alone_coder::next, out, out_pos, and lzma_alone_coder::sequence.

Referenced by alone_encoder_init().

alone_encoder_end()

static void alone_encoder_end ( void *  coder_ptr, const lzma_allocator *  allocator  )

static

Definition at line 69 of file alone_encoder.c.

{
    lzma_alone_coder *coder = coder_ptr;
    lzma_next_end(&coder->next, allocator);
    lzma_free(coder, allocator);
    return;
}

References allocator, lzma_free(), lzma_next_end(), and lzma_alone_coder::next.

Referenced by alone_encoder_init().

alone_encoder_init()

static lzma_ret alone_encoder_init ( lzma_next_coder *  next, const lzma_allocator *  allocator, const lzma_options_lzma *  options  )

static

Definition at line 80 of file alone_encoder.c.

{
    lzma_next_coder_init(&alone_encoder_init, next, allocator);
 
    lzma_alone_coder *coder = next->coder;
 
    if (coder == NULL) {
        coder = lzma_alloc(sizeof(lzma_alone_coder), allocator);
        if (coder == NULL)
            return LZMA_MEM_ERROR;
 
        next->coder = coder;
        next->code = &alone_encode;
        next->end = &alone_encoder_end;
        coder->next = LZMA_NEXT_CODER_INIT;
    }
 
    // Basic initializations
    coder->sequence = SEQ_HEADER;
    coder->header_pos = 0;
 
    // Encode the header:
    // - Properties (1 byte)
    if (lzma_lzma_lclppb_encode(options, coder->header))
        return LZMA_OPTIONS_ERROR;
 
    // - Dictionary size (4 bytes)
    if (options->dict_size < LZMA_DICT_SIZE_MIN)
        return LZMA_OPTIONS_ERROR;
 
    // Round up to the next 2^n or 2^n + 2^(n - 1) depending on which
    // one is the next unless it is UINT32_MAX. While the header would
    // allow any 32-bit integer, we do this to keep the decoder of liblzma
    // accepting the resulting files.
    uint32_t d = options->dict_size - 1;
    d |= d >> 2;
    d |= d >> 3;
    d |= d >> 4;
    d |= d >> 8;
    d |= d >> 16;
    if (d != UINT32_MAX)
        ++d;
 
    write32le(coder->header + 1, d);
 
    // - Uncompressed size (always unknown and using EOPM)
    memset(coder->header + 1 + 4, 0xFF, 8);
 
    // Initialize the LZMA encoder.
    const lzma_filter_info filters[2] = {
        {
            .init = &lzma_lzma_encoder_init,
            .options = (void *)(options),
        }, {
            .init = NULL,
        }
    };
 
    return lzma_next_filter_init(&coder->next, allocator, filters);
}

References allocator, alone_encode(), alone_encoder_end(), lzma_next_coder_s::code, lzma_next_coder_s::coder, d, lzma_next_coder_s::end, filters, lzma_alone_coder::header, lzma_alone_coder::header_pos, lzma_alloc(), LZMA_DICT_SIZE_MIN, lzma_lzma_encoder_init(), lzma_lzma_lclppb_encode(), LZMA_MEM_ERROR, LZMA_NEXT_CODER_INIT, lzma_next_coder_init, lzma_next_filter_init(), LZMA_OPTIONS_ERROR, memset(), lzma_alone_coder::next, NULL, options, lzma_alone_coder::sequence, UINT32_MAX, and write32le.

Referenced by LZMA_API().

LZMA_API()

LZMA_API

(

lzma_ret

)

Definition at line 153 of file alone_encoder.c.

{
    lzma_next_strm_init(alone_encoder_init, strm, options);
 
    strm->internal->supported_actions[LZMA_RUN] = true;
    strm->internal->supported_actions[LZMA_FINISH] = true;
 
    return LZMA_OK;
}

References alone_encoder_init(), lzma_stream::internal, LZMA_FINISH, lzma_next_strm_init, LZMA_OK, LZMA_RUN, options, strm, and lzma_internal_s::supported_actions.