forked from KolibriOS/kolibrios
104 lines
1.9 KiB
C
104 lines
1.9 KiB
C
#include "fitz.h"
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#include <zlib.h>
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typedef struct fz_flate_s fz_flate;
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struct fz_flate_s
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{
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fz_stream *chain;
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z_stream z;
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};
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static void *zalloc(void *opaque, unsigned int items, unsigned int size)
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{
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return fz_calloc(items, size);
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}
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static void zfree(void *opaque, void *ptr)
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{
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fz_free(ptr);
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}
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static int
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read_flated(fz_stream *stm, unsigned char *outbuf, int outlen)
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{
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fz_flate *state = stm->state;
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fz_stream *chain = state->chain;
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z_streamp zp = &state->z;
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int code;
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zp->next_out = outbuf;
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zp->avail_out = outlen;
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while (zp->avail_out > 0)
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{
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if (chain->rp == chain->wp)
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fz_fill_buffer(chain);
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zp->next_in = chain->rp;
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zp->avail_in = chain->wp - chain->rp;
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code = inflate(zp, Z_SYNC_FLUSH);
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chain->rp = chain->wp - zp->avail_in;
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if (code == Z_STREAM_END)
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{
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return outlen - zp->avail_out;
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}
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else if (code == Z_BUF_ERROR)
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{
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fz_warn("premature end of data in flate filter");
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return outlen - zp->avail_out;
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}
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else if (code == Z_DATA_ERROR && zp->avail_in == 0)
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{
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fz_warn("ignoring zlib error: %s", zp->msg);
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return outlen - zp->avail_out;
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}
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else if (code != Z_OK)
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{
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return fz_throw("zlib error: %s", zp->msg);
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}
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}
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return outlen - zp->avail_out;
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}
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static void
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close_flated(fz_stream *stm)
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{
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fz_flate *state = stm->state;
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int code;
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code = inflateEnd(&state->z);
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if (code != Z_OK)
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fz_warn("zlib error: inflateEnd: %s", state->z.msg);
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fz_close(state->chain);
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fz_free(state);
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}
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fz_stream *
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fz_open_flated(fz_stream *chain)
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{
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fz_flate *state;
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int code;
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state = fz_malloc(sizeof(fz_flate));
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state->chain = chain;
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state->z.zalloc = zalloc;
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state->z.zfree = zfree;
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state->z.opaque = NULL;
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state->z.next_in = NULL;
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state->z.avail_in = 0;
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code = inflateInit(&state->z);
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if (code != Z_OK)
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fz_warn("zlib error: inflateInit: %s", state->z.msg);
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return fz_new_stream(state, read_flated, close_flated);
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}
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